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Engine Controls and Fuel - 1.5L (L3A) - Diagnostic Information and Procedures - Volt

DIAGNOSTIC INFORMATION AND PROCEDURES

DTC P0446: EVAPORATIVE EMISSION (EVAP) VENT SYSTEM PERFORMANCE

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Refer to Diagnostic Procedure Instructions to provide an overview of each diagnostic category.

DTC Descriptor

DTC P0446

Evaporative Emission (EVAP) Vent System Performance

Typical Scan Tool Data

Circuit/System Description

This DTC tests the evaporative emission (EVAP) system for a restricted or blocked EVAP vent path. There are two parts to this test.

Part one uses the fuel tank pressure sensor to indicate vacuum comes within a calibrated range within a calibrated time.

The second part of this test looks for excessive vacuum which would indicate a restriction. The duration of this second part of is a function of purge volume through the system.

The table listed below illustrates the relationship between the ON and OFF states, and the OPEN or CLOSED states of the EVAP purge and vent solenoid valves.

Conditions for Running the DTC

DTCs P00C8, P00C9, P00CA, P0068, P0071, P0072, P0073 P0090, P0091, P0092, P0442, P0443, P0449, P0451, P0452, P0453, P0455, P0458, P0459, P0461, P0462, P0463, P0497, P0498, P0499, P0502, P0503, P0606, P0722, P0723, P0191, P0192, P0193, P06A3, P06DB, P06D2, P06DE, P0A1D,

P0601, P0604, P0697, P145D, P145E, P160D, P160E, P1682, P16A0, P16A1, P16A2, P16A7, P16F3, P1104, P127A, P127C, P127D, P15F2, P1221, P2066, P2067, P2068, P2100, P2101, P2102, P2103, P2122, P2123, P2127, P2128, P2135, P2138, P215B, P2176, P2227, P2228, P2229, P2230, P228C, P228D, P2400, P2401, P2402, P2418, P2419, P2420, P2422, P2450, P24B9, P24BA, P24BB, U0073,

U0074, U0293, U1817 are not set. The EVAP purge solenoid is open. The EVAP vent solenoid is open.

The EVAP leak detection pump is OFF.

The vehicle service mode voltage is greater than 11 V.

The barometric pressure (BARO) is between 70 - 110 kPa (10 - 16 PSI). The outside air temperature is between 4 - 35°C (39 - 95°F).

The engine RPM to enable is between 1500 - 3400.

The engine RPM to re-enable is between 1500 - 3300.

The engine vacuum to enable is between 15 - 56 kPa (2.1 - 8.1 PSI).

The engine vacuum to re-enable is between 16 - 54 kPa (2.3 - 7.8 PSI). The engine airflow to enable is between 5 - 29 g/s.

The engine airflow to re-enable is between 6 - 27 g/s. The purge flow to enable is greater than 0.17 g/s.

The purge flow to re-enable is greater than 0.18 g/s. The purge duty cycle to enable is greater than 15%.

The purge duty cycle to re-enable is greater than 16%.

The requested purge flow to enable is greater than 2.94%.

The delivered purge flow to re-enable is greater than 2.89%. The delivered purge flow to enable is greater than 2.06%.

The engine is running. The purge is enabled.

The refueling request button is not pressed. The device control is less than 0.5 s.

The fuel tank protection is not active.

This test will start and run once per trip when propulsion system is active and engine is On. DTC P0497 has run and passed.

Conditions for Setting the DTC

If fuel tank pressure sensor reading is less than -13 in H2O (-3.24 kPa) of vacuum for 5 s

Action Taken When the DTC Sets DTC P0446 is a Type B DTC. Conditions for Clearing the MIL/DTC

DTC P0446 is a Type B DTC.

Diagnostic Aids

An intermittent condition could be caused by: A damaged EVAP vent housing

A temporary blockage at the EVAP vent solenoid valve inlet Pinched vent hose

A blockage in the vent system may also cause a poor fuel fill problem.

Reference Information

Schematic Reference

Engine Controls Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Powertrain Component View

Powertrain Component Views

Description and Operation

Evaporative Emission Control System Description Hybrid Modes of Operation Description

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information Special Tools

CH-41415-30 Fuel Tank Cap Adapter

GE-41413-A Evaporative Emissions System Tester

For equivalent regional tools, refer to Special Tools (Diagnostic Tools) Special Tools (Repair Tools) .

Circuit/System Verification

1. Vehicle in Service Mode

2. Verify DTC P0449 is not set.

If the DTC is set

Refer to Diagnostic Trouble Code (DTC) List - Vehicle .

If the DTC is not set

3. Vehicle OFF, remove the fuel tank filler cap. Vehicle in Service Mode.

4. Verify that the Fuel Tank Pressure Sensor voltage parameter is between 2.0 - 3.0 V.

If not between the 2.0 - 3.0 V

Refer to DTC P0451-P0453.

If between the 2.0 - 3.0 V

5. Install the fuel tank filler cap, engine Running at operating temperature for 5 min,

6. Verify the scan tool Fuel Tank Pressure Sensor parameter does not increase to greater than 0.29 V when commanding the EVAP Purge Solenoid Valve to 50%.

If greater than 2.5 V

Refer to Circuit/System Testing.

If 2.5 V or less

7. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

If the DTC sets

Refer to Circuit/System Testing.

If the DTC does not set

8. All OK.

Circuit/System Testing

NOTE: Perform the Circuit/System Verification before proceeding with the Circuit/System Testing.

1. Verify a blockage or restriction does not exist in the EVAP system components listed below. Evaporative Emission Vent System Hoses

Evaporative Emission Canister

Q13 Evaporative Emission Vent Solenoid Valve Evaporative Emission Vent Filter

If a condition exists

Repair or replace the component as necessary

If none of the conditions exist

2. Reconnect all previously disconnected EVAP hardware.

NOTE: Refer to the GE-41413-A operation manual for detailed instructions in Evaporative Emission Control System Diagnosis.

3. Remove the fuel fill cap and connect the CH-41415-30 to the fuel tank filler neck. Connect the

GE-41413-A to the CH-41415-30 .

4. Turn the nitrogen/smoke valve on the GE-41413-A to nitrogen.

NOTE: DO NOT exceed the specified value in this step. Exceeding the specified value may produce incorrect test results.

5. Use the remote switch to activate the GE-41413-A and pressurize the fuel tank to 5.0 in H2O (1.24 kPa).

6. Vehicle in Service Mode

7. Verify the scan tool Fuel Tank Pressure Sensor parameter is 0 in H2O (0 kPa) when commanding the EVAP Vent Solenoid Valve to ON (Venting).

If not 0 in H2O

Test for a blockage or a restriction in the EVAP vent hose or inlet. If the inlet or hose test normal, replace the Q13 Evaporative Emission Vent Solenoid Valve.

If 0 in H2O

8. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

If the DTC sets

Refer to step 1 above.

If the DTC does not set

9. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Refer to Evaporative Emission Canister Replacement

Refer to Evaporative Emission Canister Vent Solenoid Valve Replacement

Refer to Fuel Tank Pressure Sensor Replacement

DTC P0449, P0498, OR P0499: EVAPORATIVE EMISSION (EVAP) VENT SOLENOID VALVE CONTROL CIRCUIT

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Refer to Diagnostic Procedure Instructions to provide an overview of each diagnostic category.

DTC Descriptors

DTC P0449

Evaporative Emission (EVAP) Vent Solenoid Valve Control Circuit

DTC P0498

Evaporative Emission (EVAP) Vent Solenoid Valve Control Circuit Low Voltage

DTC P0499

Evaporative Emission (EVAP) Vent Solenoid Valve Control Circuit High Voltage

Diagnostic Fault Information

Circuit/System Description

The EVAP vent solenoid valve controls fresh airflow into the EVAP canister. Battery voltage is supplied to the normally closed evaporative emission (EVAP) vent solenoid valve. The ECM grounds the EVAP vent solenoid valve control circuit through an internal switch called a driver. The ECM monitors the status of the driver. The driver is equipped with a feedback circuit that is pulled-up to a voltage. The ECM can determine if the control circuit is open, shorted to ground, or shorted to a voltage by monitoring the feedback voltage.

Conditions for Running the DTC

DTCs P0449, P0498 and P0499 run continuously when the above conditions are met.

Conditions for Setting the DTC

The ECM detects that the commanded state of the driver and the actual state of the control circuit do not match for greater than 5 s.

Action Taken When the DTC Sets

DTCs P0449, P0498 and P0499 are Type B DTCs.

Conditions for Clearing the DTC

DTCs P0449, P0498 and P0499 are Type B DTCs.

Diagnostic Aids

Where multiple DTCs set look for a common root cause like battery feeds, grounds, splices, etc.

Reference Information

Schematic Reference

Engine Controls Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Powertrain Component View

Powertrain Component Views

Description and Operation

Evaporative Emission Control System Description

Hybrid Modes of Operation Description

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

1. Vehicle in Service Mode, command the EVAP vent solenoid valve to Venting and Not Venting with a scan tool. Listen or feel for a click when the valve operates.

No click heard or felt

Refer to Circuit/System testing

Click heard or felt

2. Command the EVAP Vent Solenoid Valve to Venting and Not Venting with a scan tool

3. Verify the following scan tool parameters listed below do not display Malfunction : EVAP Vent Solenoid Valve Output Circuit High Voltage Test Status

EVAP Vent Solenoid Valve Output Circuit Open Test Status

EVAP Vent Solenoid Valve Output Circuit Low Voltage Test Status

If Malfunction is displayed

Refer to Circuit/System Testing.

If Malfunction is not displayed

4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

5. Verify the DTC does not set.

If the DTC sets

Refer to Circuit/System Testing.

If the DTC does not set

6. All OK.

Circuit/System Testing

1. Vehicle OFF, disconnect the harness connector at the Q13 Evaporative Emission Vent Solenoid Valve.

2. Vehicle in Service Mode.

3. Verify that a test lamp illuminates between the B+ circuit terminal A or 2 and ground.

If the test lamp does not illuminate and the circuit fuse is good

1. Vehicle OFF, remove the test lamp.

2. Test for less than 2 Ω in the B+ circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit.

If less than 2 Ω, verify the fuse is not open and there is voltage at the fuse.

If the test lamp does not illuminate and the circuit fuse is open

1. Vehicle OFF, remove the test lamp.

2. Test for infinite resistance between the B+ circuit and ground.

If less than infinite resistance, repair the short to ground on the circuit.

If infinite resistance, test all components connected to the B+ circuit for a short and replace as necessary.

If the test lamp illuminates

4. Verify that a test lamp does not illuminate between the B+ circuit terminal A or 2 and the control circuit terminal B or 1.

If the test lamp illuminates

1. Vehicle OFF, remove the test lamp, disconnect the harness connector at the K20 Engine Control Module.

2. Test for infinite resistance between the control circuit and ground.

If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K20 Engine Control Module.

If the test lamp does not illuminate

5. Remove the test lamp.

6. Verify the scan tool EVAP Vent Solenoid Valve Control Circuit High Voltage Test Status parameter displays OK when commanding the EVAP Vent Solenoid Valve to Venting with a scan tool.

If OK is not displayed

1. Vehicle OFF, disconnect the harness connector at the K20 Engine Control Module, vehicle in Service Mode.

2. Test for less than 1 V between the control circuit and ground.

If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K20 Engine Control Module.

If OK is displayed

7. Install a 3 A fused jumper wire between the control circuit terminal B or 1 and the B+ circuit terminal A or 2.

8. Verify the scan tool EVAP Vent Solenoid Valve Control Circuit High Voltage Test Status parameter displays Malfunction when commanding the EVAP Vent Solenoid Valve to Venting with a scan tool.

If Malfunction is not displayed

1. Vehicle OFF, remove the jumper wire, disconnect the harness connector at the K20 Engine Control Module.

2. Test for less than 2 Ω in the control circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit. If less than 2 Ω replace the K20 Engine Control Module.

If Malfunction is displayed

9. Test or replace the Q13 Evaporative Emission Vent Solenoid Valve.

Component Testing

1. Vehicle OFF, disconnect the harness connector at the Q13 Evaporative Emission Vent Solenoid Valve.

2. Test for 10-30 Ω between the control terminal B or 1 and the B+ circuit terminal A or 2.

If not between 10-30 Ω

Replace the Q13 Evaporative Emission Vent Solenoid Valve.

If between 10-30 Ω

3. Test for no air flow through the Q13 Evaporative Emission Vent Solenoid Valve by applying vacuum to the pump side of the valve. It should hold 1 - 2 in. Hg (3 - 7 kPa) for 30 s.

If not within the specified range

Replace the Q13 Evaporative Emission Vent Solenoid Valve

If within the specified range

4. Jumper:

The control terminal B or 1 to ground

The B+ circuit terminal A or 2 to 12 V battery voltage

5. Apply vacuum to the pump side of the Q13 Evaporative Emission Vent Solenoid Valve. It should not hold vacuum.

If it does hold vacuum

Replace the Q13 Evaporative Emission Vent Solenoid Valve

If it does not hold vacuum

6. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Refer to Evaporative Emission Canister Vent Solenoid Valve Replacement

Refer to Control Module References for ECM replacement, programming and setup.

DTC P0451-P0453: FUEL TANK PRESSURE SENSOR

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Refer to Diagnostic Procedure Instructions to provide an overview of each diagnostic category.

DTC Descriptors

DTC P0451

Fuel Tank Pressure Sensor Performance

DTC P0452

Fuel Tank Pressure Sensor Circuit Low Voltage

DTC P0453

Fuel Tank Pressure Sensor Circuit High Voltage

Diagnostic Fault Information

Typical Scan Tool Data

Fuel Tank Pressure Sensor

Circuit/System Description

The fuel tank pressure sensor measures the pressure or vacuum in the evaporative emission (EVAP) system. The engine control module (ECM) supplies a 5 V reference and a low reference circuit to the fuel tank pressure sensor. The fuel tank pressure sensor signal voltage varies depending on EVAP system pressure or vacuum.

The following tables illustrate relationship examples between the fuel tank pressure sensor and the ON and OFF states, and the OPEN or CLOSED states of the EVAP components.

Fuel Tank Pressure Relationship

Fuel Tank Pressure to EVAP Leak Detection Pump Assembly Relationship

Conditions for Running the DTC

P0451 - Condition 1:

DTCs P0101, P0102, P0103, P0106, P0107, P0108, P0111, P0112, P0113, P0114, P0116, P0117, P0118, P0119, P0121, P0122, P0123, P0128, P012B, P012C, P012D, P0222, P0223, P0449, P0452, P0453, P0461, P0462, P0463, P0498, P0499, P0502, P0503, P06E4, P0722, P0723, P1221, P1459, P145A, P2066, P2067, P2068, P2400, P2401, P2402, P2418, P2419, P2420, U0140, U182D, U0073, U0074,

P2537 or P2610 is not set.

DTC P1458 or P145D are not present when the test failed this ignition cycle. The barometric pressure (BARO) is between 70 - 110 kPa (10 - 16 PSI).

The fuel level is between 10 - 90%.

The engine coolant temperature (ECT) is less than 40°C (104°F).

The intake air temperature (IAT) is between 4° - 45°C (39° - 113°F). The propulsion system is not active.

The vehicle is OFF.

The service bay test is not active.

The refueling request button is not pressed. The battery voltage is greater than 10 V.

The vehicle speed is less than 1.6 km/h (1 MPH).

There are three possible time windows for this test to run. Up to that point and through this time period the propulsion system must not be active. These time windows are: 5.0, 7.0 or 9.5 h.

The DTC runs once per drive cycle and immediately after a code clear when the above conditions are met.

P0451 - Condition 2:

DTCs P0068, P0071, P0072, P0073, P010C, P010D, P0101, P0102, P0103, P0106, P0107, P0108, P0111, P0112, P0113, P0114, P012B, P012C, P012D, P0121, P0122, P0123, P0222, P0223, P0442, P0443, P0449, P0452, P0453, P0455, P0458, P0459, P0498, P0499, P0502, P0503, P0722, P0723, P0606, P1104, P1221, P145A, P145D, P145E, P1458, P1459, P16F3, P2100, P2101, P2102, P2103, P2400, P2401, P2402, P2418, P2419, P2420, P2422 or P2450 is not set.

The barometric pressure (BARO) is between 70 - 110 kPa (10 - 16 PSI).

The outside air temperature (OAT) is between 4° - 35°C (39 - 102°F). The engine is running.

The run/crank voltage is greater than 11 V.

The EVAP Purge solenoid valve is not enabled. The refueling request button is not pressed.

The DTC runs once per drive cycle when the above conditions are met.

P0452 and P0453

Vehicle ON or the engine is running.

DTCs P0452 and P0453 run continually when the above conditions are met.

Conditions for Setting the DTC

P0451

The ECM detects the difference between the fuel tank pressure sensor and the EVAP leak detection pump pressure is greater than 0.747 kPa (0.11 PSI) for greater than 5 s.

P0452

The ECM detects the fuel tank pressure sensor voltage is less than 0.15 V for greater than 8 s.

P0453

The ECM detects the fuel tank pressure sensor voltage is greater than 4.85 V for greater than 8 s.

Action Taken When the DTC Sets

DTCs P0451, P0452 and P0453 are Type B DTCs.

Conditions for Clearing the DTC

DTCs P0451, P0452 and P0453 are Type B DTCs.

Diagnostic Aids

A restriction in the EVAP canister or vent lines that keeps the fuel tank pressure and EVAP leak detection pump sensor from comparing each others value.

Since this is a sealed system there could be a pressure or vacuum existing in the system. A vent valve stuck closed will affect performance.

A switching valve stuck in the vent position will affect performance.

Ensure that the reference port on the fuel tank pressure sensor is unobstructed.

In a sealed system a condition where there is a lot of pressure or vacuum in the fuel tank to start with (fuel tank pressure sensor is outside readable range), in those cases (high vacuum) you will not see any fuel tank pressure sensor movement after purge is commanded on. On the pressure side, it may eventually get into the readable range, but could take significant time. Opening/venting the vent solenoid before testing can relieve any stored pressure or vacuum to help alleviate this.

A fuel tank pressure sensor that is skewed or does not have a linear transition from low to high may cause these DTC's to set. Scan tool output controls and Review Stored Data can help detect erratic sensor response. To test the sensor signal under vacuum conditions, use Review Stored Data and the EVAP Test function to capture data while commanding purge to 20%, then review stored data to look for erratic sensor operation. A similar test can be done for the pressure side of the sensor operation by applying pressure with the GE 41413-A while taking a snapshot.

Reference Information

Schematic Reference

Engine Controls Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Powertrain Component View

Powertrain Component Views

Description and Operation

Evaporative Emission Control System Description Hybrid Modes of Operation Description

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information Special Tools

GE 41413-A Evaporative Emissions System Tester

For equivalent regional tools, refer to Special Tools (Diagnostic Tools) Special Tools (Repair Tools) .

Circuit/System Verification

NOTE: The order of these steps is important. If not followed properly you will be bleeding off any pressure or vacuum in the system and not see any change in the EVAP leak detection pump sensor.

Read the instructions for P0451 in their entirety before proceeding to understand what is being required.

Ambient and vehicle component temperature must be above 0°C (32°F) to command the switching valve or vacuum pump. This prevents erroneous results and damage to the EVAP leak detection pump assembly.

P0451

1. Verify DTC P0449, P0498 or P0499 is not set

If the DTC sets

Refer to: DTC P0449, P0498, or P0499

If the DTC does not set

2. Verify DTC P0452 or P0453 is not set

If the DTC sets

Refer to Circuit/System Testing

If the DTC does not set

3. Vehicle in Service Mode.

4. Record the scan tool Fuel Tank Pressure Sensor parameter, pressure or vacuum.

5. Command the EVAP Vent Solenoid Valve to Venting.

6. The Fuel Tank Pressure Sensor parameter should be 0.07 in H2O, 0.01 kPa (0.00 PSI) after 5 s.

If not within the specified range

Verify the following conditions do not exist:

A restriction in the EVAP canister or vent lines A EVAP vent solenoid valve stuck closed

The reference port on the fuel tank pressure sensor is obstructed Repair or replace as necessary

If within specified range

7. Command the EVAP leak detection pump ON using the scan tool EVAP Test. Get the fuel tank pressure sensor parameter to -11.56 in H2O, -2.88 kPa (-0.42 PSI) or greater. This may take several seconds.

NOTE: Use of any control function other than EVAP Test will not create a vacuum in the system.

NOTE: Vacuum will decay exiting the EVAP Test and going to step 8. This is normal. There should be sufficient vacuum left to perform steps 8 and 9.

8. Record the scan tool EVAP Leak Detection Pump and Fuel Tank Pressure Sensor parameters, reading one.

9. Perform each step listed below in order:

1. Select scan tool Fuel Tank Pressure Sensor Test.

2. Command the EVAP Leak Detection Pump Switching Valve Command to Not Venting.

3. Wait for 3 s.

4. Command the EVAP Vent Solenoid Valve Command ON.

NOTE: Wait for 15 s while observing the parameters then click the pause button on the scan tool to retain the parameters.

10. Record the scan tool EVAP Leak Detection Pump and Fuel Tank Pressure Sensor parameters, reading two.

11. Press the scan tool Release Control button after recording the parameters.

NOTE: The subtraction results and Fuel Tank Pressure parameter should be negative since a vacuum was pulled on the system.

12. Subtract the EVAP leak detection pump reading 2 from EVAP leak detection pump reading 1. This value equals what the fuel tank pressure sensor, reading two, should be (EVAP leak detection pump reading 2 -

EVAP leak detection pump reading 1 = fuel tank pressure reading 2). The fuel tank pressure sensor should be within 3 in H2O, 0.749 kPa (0.11 PSI) of the subtraction just performed.

If not within the specified range

Verify the following conditions do not exist:

A restriction in the EVAP canister or vent lines A EVAP vent solenoid valve stuck closed

The reference port on the fuel tank pressure sensor is obstructed Repair or replace as necessary

If within the specified range

13. All OK.

P0452 and P0453

1. Request a refueling event.

2. Remove the fuel cap.

3. Vehicle in Service Mode.

4. Verify the scan tool Fuel Tank Pressure Sensor parameter. It should be 2.67 V at 0 kPa (0 PSI).

If not within the specified range

Refer to circuit/system testing.

If within the specified range

5. All OK.

Circuit/System Testing

NOTE: Testing for steps 2 - 6 is performed on the ECM side of the harness connector.

1. Vehicle OFF, all systems OFF. Disconnect the harness connector at the B150 Fuel Tank Pressure Sensor. It may take up to for 2 min for all vehicle systems to power down.

2. Test for less than 5 Ω between the low reference circuit terminal 2 and ground.

If 5 Ω or greater

1. Vehicle OFF, disconnect the harness connector at the K20 Engine Control Module.

2. Test for less than 2 Ω in the low reference circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit. If less than 2 Ω, replace the K20 Engine Control Module.

If less than 5 Ω

3. Vehicle in Service Mode.

4. Test for 4.8 - 5.2 V between the 5 V reference circuit terminal 3 and ground.

If less than 4.8 V

1. Vehicle OFF, disconnect the harness connector at the K20 Engine Control Module.

2. Test for infinite resistance between the 5 V reference circuit and ground.

If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance

3. Test for less than 2 Ω in the 5 V reference circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit. If less than 2 Ω, replace the K20 Engine Control Module.

If greater than 5.2 V

1. Vehicle OFF, disconnect the harness connector at the K20 Engine Control Module, Vehicle in Service Mode.

2. Test for less than 1 V between the 5 V reference circuit and ground. If 1 V or greater, repair the short to voltage on the circuit.

If less than 1 V, replace the K20 Engine Control Module.

If between 4.8 - 5.2 V

5. Verify the scan tool Fuel Tank Pressure parameter is less than 0.2 V.

If 0.2 V or greater

1. Vehicle OFF, disconnect the harness connector at the K20 Engine Control Module, Vehicle in Service Mode

2. Test for less than 1 V between the signal circuit terminal 1 and ground. If 1 V or greater, repair the short to voltage on the circuit.

If less than 1 V, replace the K20 Engine Control Module.

If less than 0.2 V

6. Install a 3 A fused jumper wire between the signal circuit terminal 1 and the 5 V reference circuit terminal 3.

7. Verify the scan tool Fuel Tank Pressure Sensor parameter is greater than 4.7 V.

If 4.7 V or less

1. Vehicle OFF, disconnect the harness connector at the K20 Engine Control Module.

2. Test for infinite resistance between the signal circuit terminal 1 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance

3. Test for less than 2 Ω in the signal circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit. If less than 2 Ω, replace the K20 Engine Control Module.

If greater than 4.7 V

8. Test or replace the B150 Fuel Tank Pressure Sensor.

Component Testing

1. Remove the Q63 Evaporative Emission System Leak Detection Pump Assembly

2. Verify none of the conditions listed below exist:

Poor connection at the X350 or X351 harness connectors Open or shorted 5 V reference circuit

Open or shorted sensor signal circuit Open low reference circuit

If a condition exists

Repair as necessary.

If no conditions exist

3. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Refer to Fuel Tank Pressure Sensor Replacement

Refer to Control Module References for ECM replacement, programming and setup.

DTC P0497: EVAPORATIVE EMISSION (EVAP) SYSTEM NO FLOW DURING PURGE

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Refer to Diagnostic Procedure Instructions to provide an overview of each diagnostic category.

DTC Descriptor

DTC P0497

Evaporative Emission (EVAP) System No Flow During Purge

Circuit/System Description

This DTC tests for proper intake manifold vacuum flow to the evaporative emission (EVAP) system. The engine control module (ECM) opens the EVAP purge solenoid valve and the EVAP vent solenoid valve. The ECM then monitors the fuel tank pressure sensor and EVAP leak detection pump pressure sensor to determine if a vacuum is being drawn on the EVAP system. If vacuum in the EVAP system is less than a predetermined value within a predetermined time, this DTC sets.

Conditions for Running the DTC

DTCs P0068, P0071, P0072, P0073, P0106, P0107, P0108, P0122, P0123, P0222, P0223, P0442, P0443, P0449, P0451, P0452, P0453, P0455, P0458, P0459, P0498, P0499, P0502, P0503, P0606, P0722, P0723, P16F3, P1104, P145D, P145E, P2100, P2101, P2102, P2103, P2400, P2401, P2402, P2418, P2419, P2420, P2422, P2450, P24B9, P24BA and P24BB is not set.

The EVAP purge solenoid is open. The EVAP vent solenoid is open.

The EVAP leak detection pump is OFF.

The vehicle service mode voltage is greater than 11 V.

The barometric pressure (BARO) is between 70 - 110 kPa (10 - 16 PSI). The outside air temperature is between 4 - 35°C (39 - 95°F).

The engine RPM to enable is between 1500 - 3400.

The engine RPM to re-enable is between 1500 - 3300.

The engine vacuum to enable is between 15 - 56 kPa (2.1 - 8.1 PSI).

The engine vacuum to re-enable is between 16 - 54 kPa (2.3 - 7.8 PSI). The engine airflow to enable is between 5 - 29 g/s.

The engine airflow to re-enable is between 6 - 27 g/s. The purge flow to enable is greater than 0.17 g/s.

The purge flow to re-enable is greater than 0.18 g/s. The purge duty cycle to enable is greater than 15%.

The purge duty cycle to re-enable is greater than 16%.

The requested purge flow to enable is greater than 2.94%.

The delivered purge flow to re-enable is greater than 2.89%. The delivered purge flow to enable is greater than 2.06%.

The engine is running. The purge is enabled.

The refueling request button is not pressed. The device control is less than 0.5 s.

The fuel tank protection is not active.

This test will start and run once per trip with propulsion system active and engine is ON.

Conditions for Setting the DTC

After an initial time delay of 3 s when the fuel tank pressure sensor reading is greater than 0.39 kPa (0.056 PSI).

Or

After an initial time delay of 3 s when the fuel tank pressure sensor reading is less than 0.39 kPa (0.056 PSI), plus an EVAP leak detection pump switching valve delay time of 0.2 s.

If the EVAP leak detection pump pressure sensor, gauge, indicates a vacuum change less than 2 kPa (0.29 PSI) for 20 s, then a low purge flow failure has been detected.

Action Taken When the DTC Sets DTC P0497 is a Type B DTC. Conditions for Clearing the MIL/DTC DTC P0497 is a Type B DTC. Diagnostic Aids

A temporary blockage in the components listed below could cause an intermittent condition.

EVAP purge solenoid valve Purge pipe

EVAP canister

A EVAP vent solenoid valve stuck closed can cause this DTC to set.

A EVAP leak detection pump switching valve stuck in the vent or pump position can cause this DTC to set.

A fuel tank fuel pump module assembly not fully seated in the fuel tank can cause this DTC to set. A loose fuel cap can cause this DTC to set.

Reference Information

Schematic Reference

Engine Controls Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Powertrain Component View

Powertrain Component Views

Description and Operation

Evaporative Emission Control System Description Hybrid Modes of Operation Description

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information Special Tools

CH-48096 EVAP Service Access Port Tool

GE-41413-A Evaporative Emissions System Tester

GE-41413-300 EVAP Cap And Plug Kit

GE-41413-SPT High Intensity White Light

For equivalent regional tools, refer to Special Tools (Diagnostic Tools) Special Tools (Repair Tools) .

Circuit/System Verification

WARNING: Refer to Fuel and Evaporative Emission Pipe Warning . CAUTION: Refer to Clean, Dry, Low Pressure Gas Source Caution .

NOTE: Refer to GE-41413-A operation manual for detailed instructions in Evaporative Emission Control System Diagnosis.

1. Verify the following conditions do not exist in the EVAP system: A loose, missing, or damaged fuel fill cap.

A stuck closed, blocked, or restricted EVAP purge solenoid valve.

A blockage or restriction in the EVAP purge solenoid valve vacuum supply hose, purge pipe, EVAP canister or vapor pipe.

If a condition is found

Repair or replace as necessary.

If no conditions are found

CAUTION: Refer to Fuel and Evaporative Emission Hose/Pipe Connection Cleaning Caution .

2. Connect the CH-48096 to the EVAP purge solenoid valve.

3. Connect the GE-41413-A to CH-48096

4. Disconnect the fresh air intake tube from the EVAP leak detection pump.

5. Plug the fresh air port of the EVAP leak detection pump

6. Engine running, observe the GE-41413-A vacuum gauge and Fuel Tank Pressure parameter with a scan tool. There should be vacuum present.

If no vacuum is detected

Refer to Circuit System Testing

If vacuum is detected

7. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

If the DTC sets

Refer to Circuit System Testing

If the DTC does not set

8. All OK.

Circuit/System Testing

NOTE: Perform the Circuit/System Verification before proceeding with the Circuit/System Testing.

1. The GE-41413-A should still be installed from verification.

2. Engine running, observe the vacuum gauge while commanding the EVAP Purge Solenoid Valve to Increase with the scan tool. Vacuum should be present from 10 - 100%.

If no vacuum is present

Test or replace the Q12 Evaporative Emission Purge Solenoid Valve.

If vacuum is present

3. Install the plug in the fresh air port performed in step 5 of circuit system verification.

4. Observe the Fuel Tank Pressure parameter while commanding the EVAP Purge Solenoid Valve to Increase with the scan tool. The parameter should be greater than 1.50 V within 60 s.

If less than the specified range

Repair the blocked purge path or test or replace the Q12 Evaporative Emission Purge Solenoid Valve.

If within specified range

5. All OK

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Refer to Evaporative Emission Canister Purge Solenoid Valve Replacement Refer to Evaporative Emission Canister Vent Solenoid Valve Replacement Refer to Evaporative Emission Canister Replacement

Refer to Evaporative Emission System Vacuum Leak Detection Pump Replacement

DTC P050D: COLD START ROUGH IDLE

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Refer to Diagnostic Procedure Instructions to provide an overview of each diagnostic category.

DTC Descriptor

DTC P050D

Cold Start Rough Idle

Circuit/System Description

During a cold start, the engine control module (ECM) commands dual-pulse mode during Open Loop operation to improve cold start emissions. In dual-pulse mode, the injectors are energized twice during each injection event. As with misfire diagnosis, in dual-pulse mode the ECM monitors the crankshaft position sensor and the camshaft position sensors to calculate crankshaft rotation speed. In normal operation, optimum fuel delivery during dual-pulse mode produces a steady crankshaft rotation speed. If the variations exceed a calibrated value, the code will be set.

Conditions for Running the DTC

DTCs P0010, P0011, P0013, P0014, P0020, P0021, P0023, P0024, P0090, P0091, P0092, P00C8, P00C9, P00CA, P0101-P0103, P0106-P0108, P010B, P010C, P010D, P0112, P0113, P0117, P0118, P0119, P0122, P0123, P0128, P0192, P0193, P0201-P0204, P0205, P0206, P0207, P0208, P0222, P0223, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P0273, P0274, P0276, P0277, P0279, P0280, P0282, P0283, P0335, P0336, P0351-P0354, P0355, P0356, P0357, P0358, P0502, P0503, P0506, P0507, P05CC, P05CD, P05CE, P05CF, P0627, P0628, P0629, P0697, P06A3, P0722, P0723, P0806, P0807, P0808, P111E, P1248, P1249, P124A, P127C, P127D, P124B, P128A, P128B, P128F, P16A0, P16A1, P16A2, P16E4, P16E5, P16F3, P182E, P1824, P182A, P182B, P182C, P182D, P182F, P1838, P1839, P1840, P1841, P18B5, P18B6, P18B7, P18B8, P18B9, P18BA, P18BB, P18BC, P18BD, P18BE, P18BF, P18C0, P18C1, P18C2, P18C3, P1915, P2088, P2089, P2090, P2091, P2092, P2093, P2094, P2095, P2122, P2123, P2127, P2128, P2135, P2138, P2147, P2148, P2150, P2151, P2153, P2154, P2156, P2157, P216B, P216C, P216E, P216F, P217B, P217C, P217E, P217F, P1248, P1249, P124A, P124B, P124C, P124D, P124E, P124F, P2300, P2301, P2303, P2304, P2306, P2307, P2309, P2310, P2312, P2313, P2315, P2316, P2318, P2319, P2321, P2322 are not set.

The catalyst temperature is less than 350°C (662°F).

The engine coolant temperature is between -15 - 56°C (5 - 132.8°F). The barometric pressure is greater than 76 kPa.

The engine speed is between 450 - 2200 RPM.

The accelerator pedal position is less than 110%.

The engine is running for less than 30 s and a cold start has been detected. The DTC runs once per cold start.

Conditions for Setting the DTC

This DTC will set if the ECM detects variations in crankshaft rotation speed caused by the lack of adequate fuel delivery during dual-pulse mode.

Action Taken When the DTC Sets

DTC P050D is a Type B DTC.

The ECM disables dual pulse mode and energizes the fuel injector as it would for a warm engine.

Conditions for Clearing the DTC DTC P050D is a Type B DTC. Diagnostic Aids

This DTC may be set with a misfire DTC, however the existence of this DTC is a higher priority and indicates the condition to diagnose is related to fuel and/or injectors, not the ignition/spark system.

A restricted fuel injector may cause this DTC to set.

High resistance in the circuits of the injectors could set this DTC without setting an injector DTC. Test the injector circuits of the affected cylinders for a high resistance if you suspect a condition.

A drop in system voltage during cold start may set this DTC.

Reference Information

Schematic Reference

Engine Controls Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Powertrain Component View

Powertrain Component Views

Description and Operation

Hybrid Modes of Operation Description

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

NOTE: Circuit/System Verification requires cold start. Do not start vehicle prior to connecting scan tool and preparing to evaluate the condition during engine crank.

1. Engine running.

2. Verify that the scan tool Cylinder 1-4 Current Misfire Counters are not incrementing during first 500 engine cycles.

If incrementing

Refer to Circuit/System Testing.

If not incrementing

3. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

4. Verify the DTC does not set.

If the DTC sets

Refer to Circuit/System Testing.

If the DTC does not set

5. All OK.

Circuit/System Testing

1. Verify that the fuel pressure is not too low or too high. Refer to Fuel System Diagnosis. If a condition is found

Repair or replace components as necessary

If a condition is not found

2. Verify that the fuel is not contaminated. Refer to Alcohol/Contaminants-in-Fuel Diagnosis. If the fuel is contaminated

Clean the fuel system. Refer to Fuel System Cleaning .

If the fuel is not contaminated

3. Replace the appropriate fuel injectors as indicated by high misfire counts.

Repair Instructions

NOTE: Repair Verification requires cold start.

Perform the Diagnostic Repair Verification after completing the repair. Refer to Fuel Injector Replacement

DTC P057B-P057E: BRAKE PEDAL POSITION SENSOR

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Refer to Diagnostic Procedure Instructions to provide an overview of each diagnostic category.

DTC Descriptors

DTC P057B

Brake Pedal Position Sensor Performance

DTC P057C

Brake Pedal Position Sensor Circuit Low Voltage

DTC P057D

Brake Pedal Position Sensor Circuit High Voltage

DTC P057E

Brake Pedal Position Sensor Circuit Erratic

Diagnostic Fault Information

Typical Scan Tool Data

Brake Pedal Position Sensor

Circuit/System Description

The brake pedal position (BPP) sensor is part of the engine brake pedal override feature. The engine control module (ECM) continuously monitors the vehicle speed and the position of the brake pedal. These two main inputs, along with other ECM inputs are used to determine if the vehicle is decelerating at the proper speed and rate with the brake pedal applied. When the engine brake pedal override system is active, the ECM reduces engine torque to assist in reducing vehicle speed.

The BPP sensor is a six wire sensor, and is part of a dual brake position sensor. One BPP Sensor is used for the stop lamps and the other BPP Sensor is used for the engine brake pedal override feature. The BPP Sensor for engine brake pedal override communicates with the ECM. The ECM supplies a 5 V reference circuit, low reference circuit, and signal circuit to the BPP sensor. The BPP sensor sends a voltage signal to the ECM on the signal circuit. The voltage on the signal circuit will vary from a voltage greater than 0.25 V when the brake

pedal is released to a voltage less than 4.75 V when the brake pedal is fully applied.

For information on the Stop Lamps side of the BPP Sensor, refer to Exterior Lighting Systems Description and Operation .

Conditions for Running the DTC

P057B

DTCs P057C, or P057D are not set. Ignition voltage is greater than 10 V.

Shift lever has been in Park at least once during key ON. Shift lever is not in Park.

Vehicle speed is greater than 8 Km/h (5 mph). Accelerator Pedal Position is less than 5%.

DTC runs once per key cycle when above conditions are met.

P057C, P057D, or P057E

Ignition voltage is greater than 10 V.

DTC runs continuously when above condition is met.

Conditions for Setting the DTC

P057B

ECM detects the BPP sensor signal is stuck in a range for greater than 1 s.

P057C

ECM detects the BPP sensor voltage is less than 0.25 V greater than 1 s.

P057D

ECM detects the BPP sensor voltage is greater than 4.75 V greater than 1 s.

P057E

ECM detects the BPP sensor value varies greater than a calibrated value.

Action Taken When the DTC Sets

P057B, P057C, P057D, and P057E are Type A DTCs.

Brake Pedal Position Sensor parameter defaults to 0%.

Conditions for Clearing the DTC

P057B, P057C, P057D, and P057E are Type A DTCs

Reference Information

Schematic Reference

Engine Controls Schematics Exterior Lights Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

INLINE HARNESS CONNECTOR END VIEWS - INDEX

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

NOTE: The Brake Pedal Position sensor scan tool data is located in the ECM automatic transmission data list.

1. Vehicle in Service Mode.

2. Verify DTC P0641, P0651, P0697, or P06A3 is not set.

If any of the DTCs are set

Refer to Diagnostic Trouble Code (DTC) List - Vehicle .

If none of the DTCs are set

3. Transmission in Park, and service brake pedal released.

4. Verify the scan tool Brake Pedal Position Sensor parameter in the ECM displays released.

If released is displayed

Refer to Circuit/System Testing.

If released is not displayed

5. Verify the scan tool Brake Pedal Position Sensor parameter changes as the brake pedal is applied and displays applied on a scan tool when the brake pedal is fully applied.

If applied is displayed

Refer to Circuit/System Testing.

If applied is not displayed

6. Verify the scan tool Brake Pedal Position Sensor Learned Release Position parameter is within 0.1 V of the Brake Pedal Position Sensor parameter when the brake pedal is fully released.

If difference is greater than 0.1 V

Perform the Brake Pedal Position Sensor Learn .

If difference is 0.1 V or less

7. Verify the Brake Pedal Position Sensor parameter transitions smoothly without any spikes or dropouts when slowly applying and releasing the brake pedal.

If parameter does not transition smoothly or has spikes or dropouts

Refer to Circuit/System Testing.

If parameter transitions smoothly and there are no spikes or dropouts

8. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

9. Verify the DTC does not set.

If the DTC sets

Refer to Circuit/System Testing.

If the DTC does not set

10. All OK.

Circuit/System Testing

NOTE: You must perform the Circuit/System Verification first.

1. Vehicle OFF and all vehicle systems OFF, disconnect the harness connector at the B22 Brake Pedal Position Sensor. It may take up to 2 minutes for all vehicle systems to power down.

NOTE: All terminal references are for the vehicle harness brake pedal position sensor connector.

2. Test for less than 10 Ω between the low reference circuit terminal 6 and ground.

If 10 Ω or greater

1. Disconnect the harness connector at the K20 Engine Control Module.

2. Test for less than 2 Ω in the low reference circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit. If less than 2 Ω, replace the K20 Engine Control Module.

If less than 10 Ω

3. Vehicle in Service Mode.

4. Test for 4.8 - 5.2 V between the 5 V reference circuit terminal 5 and ground.

If less than 4.8 V

1. Vehicle OFF, disconnect the harness connector at the K20 Engine Control Module.

2. Test for infinite resistance between the 5 V reference circuit and ground.

If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance.

3. Test for less than 2 Ω in the 5 V reference circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit. If less than 2 Ω, replace the K20 Engine Control Module.

If greater than 5.2 V

1. Vehicle OFF, disconnect the harness connector at the K20 Engine Control Module, vehicle ON.

2. Test for less than 1 V between the 5 V reference circuit and ground. If 1 V or greater, repair the short to voltage on the circuit.

If less than 1 V, replace the K20 Engine Control Module.

If between 4.8 - 5.2 V

5. Verify the scan tool Brake Pedal Position Sensor parameter is released.

If released is not displayed

1. Vehicle OFF, disconnect the harness connector at the K20 Engine Control Module, vehicle ON.

2. Test for less than 0.25 V between the signal circuit terminal 4 and ground. If 0.25 V or greater, repair the short to voltage on the circuit.

If less than 0.25 V, replace the K20 Engine Control Module.

If released is displayed

6. Install a 3 A fused jumper wire between the signal circuit terminal 4 and the 5 V reference circuit terminal 5.

7. Verify the scan tool Brake Pedal Position Sensor parameter is applied.

If applied is not displayed

1. Vehicle OFF, remove the jumper wire, and disconnect the harness connector at the K20 Engine Control Module.

2. Test for infinite resistance between the signal circuit terminal 4 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance.

3. Test for less than 2 Ω in the signal circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit. If less than 2 Ω, replace the K20 Engine Control Module.

If applied is displayed

8. Replace the B22 Brake Pedal Position Sensor.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Refer to Brake Pedal Position Sensor Replacement

Perform the Brake Pedal Position Sensor Learn following the replacement of the ECM or BPP sensor, or any repair that effects the BPP sensor alignment.

Refer to Control Module References for Engine Control Module replacement, programming and setup.

DTC P0601-P0604, P0606, P062B, P062F, P0630, P16F3, OR P262B: CONTROL MODULE

Diagnostic Instructions

Preform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Refer to Diagnostic Procedure Instructions to provide an overview of each diagnostic category.

DTC Descriptors

DTC P0601

Control Module Read Only Memory Performance

DTC P0602

Control Module Not Programmed

DTC P0603

Control Module Long Term Memory Reset

DTC P0604

Control Module Random Access Memory Performance

DTC P0606

Control Module Processor Performance

DTC P062B

Control Module Fuel Injector Control Performance

DTC P062F

Control Module Long Term Memory Performance

DTC P0630

VIN Not Programmed or Mismatched - Engine Control Module (ECM)

DTC P16F3

Control Module Redundant Memory Performance

DTC P262B

Control Module Power Off Timer Performance

Circuit/System Description

This diagnostic applies to internal microprocessor integrity conditions within the engine control module (ECM). This diagnostic also addresses if the ECM is not programmed.

The ECM monitors its ability to read and write to the memory. It also monitors a timing function.

Conditions for Running the DTC

P0601, P0602, P0630

The vehicle is ON.

These DTCs run continuously when the above condition is met.

P0603, P062F

The vehicle is ON.

These DTCs run once per ignition cycle.

P0604

The vehicle is ON for greater than 30 s.

DTC P0604 runs continuously when the above condition is met.

P0606, P062B

The system voltage is greater than 11 V.

DTC P0606 runs continuously when the above condition is met.

P16F3

The engine is running.

DTCs P0101, P0102, P0103, P0106, P0107, or P0108 are not set.

DTC P16F3 runs continuously when the above conditions are met.

P262B

Vehicle OFF.

The ECM is not powered down.

DTC P262B runs continuously when the above conditions are met.

Conditions for Setting the DTC

The ECM detects an internal failure or incomplete programming for more than 10 s.

Action Taken When the DTC Sets

DTCs P0601, P0602, P0603, P0604, P0606, P0630, and P16F3 are Type A DTCs.

DTCs P062F and P262B are Type B DTCs.

Conditions for Clearing the DTC

DTCs P0601, P0602, P0603, P0604, P0606, P0630, and P16F3 are Type A DTCs.

DTCs P062B, P062F and P262B are Type B DTCs.

Diagnostic Aids

Low voltage or a momentary loss of power or ground to the ECM may cause a DTC to set. Verify the following: The battery cables are clean and tight, and the battery is fully charged. Refer to Battery Inspection/Test

The ECM ground circuits do not have an open or high resistance.

The ECM power circuits do not have an open, short to ground, or high resistance.

Reference Information

Schematic Reference

Engine Controls Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Component View Reference

Powertrain Component Views

Description and Operation

Hybrid Modes of Operation Description

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

1. Vehicle in Service Mode, clear the DTC information with a scan tool.

2. Verify no other DTCs are set.

If any other DTCs are set

Refer to Diagnostic Trouble Code (DTC) List - Vehicle for further diagnosis.

If no other DTCs are set

3. Verify DTC P0602 or P0630 is not set.

If any of the DTCs are set

1. Program the K20 Engine Control Module. Refer to Control Module References .

2. Verify DTC P0602 or P0630 is not set.

If any of the DTCs are set, replace the K20 Engine Control Module. If none of the DTCs are set

3. All OK.

If none of the DTCs are set

4. Verify DTC P0601, P0603, P0604, P0606, P062B, P062F, P16F3, or P262B is not set.

If any of the DTCs are set

Replace the K20 Engine Control Module.

If none of the DTCs are set

5. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Refer to Control Module References for control module replacement, programming, and setup.

DTC P0627-P0629: FUEL PUMP ENABLE CIRCUIT

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Refer to Diagnostic Procedure Instructions to provide an overview of each diagnostic category.

DTC Descriptor

DTC P0627

Fuel Pump Enable Circuit

DTC P0628

Fuel Pump Enable Circuit Low Voltage

DTC P0629

Fuel Pump Enable Circuit High Voltage

Diagnostic Fault Information

Circuit/System Description

The engine control module (ECM) provides ignition voltage to the fuel pump driver control module whenever the engine is cranking or running. The ECM enables the fuel pump driver control module as long as the engine is cranking or running, and ignition system reference pulses are received. While this enable voltage is being received, the fuel pump driver control module supplies a varying voltage to the in-tank fuel pump module in order to maintain the desired fuel line pressure.

Conditions for Running the DTC

The engine speed is greater than 0 RPM.

The ignition voltage is greater than or equal to 11 V. The fuel pump enable circuit is commanded ON.

The DTCs run continuously when the above conditions are met.

Conditions for Setting the DTC

The ECM detects that the commanded state of the driver and the actual state of the control circuit do not match for 2.5 s.

Action Taken When the DTC Sets

DTCs P0627, P0628, and P0629 are Type B DTCs.

Conditions for Clearing the DTC

DTCs P0627, P0628, and P0629 are Type B DTCs.

Reference Information

Schematic Reference

Engine Controls Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Fuel System Description

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

1. Vehicle in Service Mode.

2. Verify DTC P0627, P0628, or P0629 is not set.

If a DTC is set

Refer to Circuit/System Testing.

If a DTC is not set

3. Verify the parameters listed below do not display Malfunction when commanding the Fuel Pump Enable On and Off with a scan tool.

Fuel Pump Enable Circuit Low Voltage Test Status Fuel Pump Enable Circuit Open Test Status

Fuel Pump Enable Circuit High Voltage Test Status

If Malfunction is displayed

Refer to Circuit/System Testing.

If Malfunction is not displayed

4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

5. Verify the DTC does not set.

If the DTC sets

Refer to Circuit/System Testing.

If the DTC does not set

6. All OK.

Circuit/System Testing

1. Vehicle OFF, disconnect the K111 Fuel Pump Driver Control Module harness connector.

2. Vehicle in Service Mode for greater than 10 s.

3. Verify that a test lamp does not illuminate between the control circuit terminal 2 and ground.

If the test lamp illuminates

1. Vehicle OFF, remove the test lamp, disconnect the harness connector at the K20 Engine Control Module, vehicle in Service Mode.

2. Test for less than 1 V between the control circuit and ground.

If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K20 Engine Control Module.

If the test lamp does not illuminate

4. Remove the test lamp.

5. Verify the scan tool Fuel Pump Enable Circuit Low Voltage Test Status parameter is OK when commanding the Fuel Pump Enable On with a scan tool.

If OK is not displayed

1. Vehicle OFF, disconnect the harness connector at the K20 Engine Control Module.

2. Test for infinite resistance between the control circuit and ground.

If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K20 Engine Control Module.

If OK is displayed

6. Install a 3 A fused jumper wire between the control circuit terminal 2 and ground.

7. Verify the scan tool Fuel Pump Enable Circuit Low Voltage Test Status parameter is Malfunction when commanding the Fuel Pump Enable On with a scan tool.

If Malfunction is not displayed

1. Vehicle OFF, remove the jumper wire, disconnect the harness connector at the K20 Engine Control Module.

2. Test for less than 2 Ω in the control circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit. If less than 2 Ω, replace the K20 Engine Control Module.

If Malfunction is displayed

8. Test or replace the K111 Fuel Pump Driver Control Module.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Refer to Control Module References for Engine Control Module and Fuel Pump Power Control Module replacement, programming, and setup

DTC P0641, P0651, P0697, P06A3, OR P06D2: 5 V REFERENCE 1-5 CIRCUIT

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Refer to Diagnostic Procedure Instructions to provide an overview of each diagnostic category.

DTC Descriptors

DTC P0641

5 V Reference 1 Circuit

DTC P0651

5 V Reference 2 Circuit

DTC P0697

5 V Reference 3 Circuit

DTC P06A3

5 V Reference 4 Circuit

DTC P06D2

5 V Reference 5 Circuit

Circuit/System Description

The engine control module (ECM) has 5 internal 5 V reference circuits. Each internal reference circuit provides external 5 V reference circuits for more than one sensor. A short to ground or short to voltage on one external 5 V reference circuit can affect all the components connected to the same internal 5 V reference circuit.

Conditions for Running the DTC

The DTCs run continuously when the ignition voltage is greater than 6.4 V.

Conditions for Setting the DTC

The ECM detects a short to ground or voltage on any of the 5 V reference circuits for greater than 0.5 s.

Action Taken When the DTC Sets

DTCs P0641, P0651, P0697, P06A3, and P06D2 are Type A DTCs.

Conditions for Clearing the DTC

DTCs P0641, P0651, P0697, P06A3, and P06D2 are Type A DTCs.

Diagnostic Aids

The 5 V reference 1 circuit provides 5 V circuits to the sensors listed below: Air conditioning (A/C) refrigerant pressure sensor

Exhaust camshaft position sensor Intake camshaft position sensor

Fuel tank pressure sensor

The 5 V reference 2 circuit provides 5 V circuits to the sensors listed below:

Evaporative emission system leak detection pump assembly Crankshaft position sensor

The 5 V reference 3 circuit provides 5 V circuits to the sensors listed below:

Manifold Absolute Pressure Sensor Accelerator Pedal Position Sensor 2

The 5 V reference 4 circuit provides 5 V circuits to the sensors listed below:

Accelerator pedal position sensor 1 Throttle position sensor 1 and 2

Disconnecting one component at a time from the affected 5 V reference circuit while observing the scan tool 5 V Reference Circuit Status parameter may help locate the fault. The scan tool parameter will change from Malfunction to OK when the source of the fault is disconnected. If all 5 V reference components have been disconnected and a fault is still indicated, the fault may exist in the wiring harness.

Reference Information

Schematic Reference

Engine Controls Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Component View Reference

Powertrain Component Views

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

1. Vehicle in Service Mode.

2. Verify all scan tool 5 V Reference Circuit Status parameters do not display Malfunction.

If Malfunction is displayed

Refer to Circuit/System Testing.

If Malfunction is not displayed

3. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

4. Verify the DTC does not set.

If the DTC sets

Refer to Circuit/System Testing.

If the DTC does not set

5. All OK.

Circuit/System Testing

NOTE: Additional DTCs will set when disconnecting the components.

1. Vehicle OFF, disconnect the harness connector at all appropriate sensors for the applicable DTC. Refer to Diagnostic Aids.

2. Vehicle in Service Mode.

3. Test for 4.8 - 5.2 V between one of the 5 V reference circuits and ground.

If less than 4.8 V

1. Vehicle OFF, disconnect the harness connectors at the K20 Engine Control Module.

2. Test for infinite resistance between the 5 V reference circuit for each applicable component and ground.

If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K20 Engine Control Module.

If greater than 5.2 V

1. Vehicle OFF, disconnect the harness connectors at the K20 Engine Control Module.

2. Test for less than 1 V between the 5 V reference circuit for each applicable component and ground. If 1 V or greater, repair the short to voltage on the circuit.

If less than 1 V, replace the K20 Engine Control Module.

If between 4.8 - 5.2 V

NOTE: A short to voltage or ground on the signal circuit of certain components may cause this DTC to set.

4. Vehicle in Service Mode.

5. Verify the appropriate scan tool 5 V Reference 1, 2, 3, or 4 Circuit Status parameter displays OK while connecting each component associated with the 5 V reference circuit one at a time.

If OK is not displayed when a component is connected

Test the signal circuit of that component for a short to ground or voltage. If the circuit tests normal, replace the component.

If OK is displayed after all components have been connected

6. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Refer to Accelerator Pedal Replacement

Refer to Camshaft Position Sensor Replacement - Intake

Refer to Camshaft Position Sensor Replacement - Exhaust

Refer to Crankshaft Position Sensor Replacement

Refer to Fuel Tank Pressure Sensor Replacement

Refer to Manifold Absolute Pressure Sensor Replacement

Refer to Throttle Body Assembly Replacement

Refer to Evaporative Emission System Vacuum Leak Detection Pump Replacement

Refer to Control Module References for engine control module replacement, programming, and setup.

DTC P0650, P263A, OR P263B: MALFUNCTION INDICATOR LAMP (MIL) CONTROL CIRCUIT

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Refer to Diagnostic Procedure Instructions to provide an overview of each diagnostic category.

DTC Descriptor

DTC P0650

Malfunction Indicator Lamp (MIL) Control Circuit

DTC P263A

Malfunction Indicator Lamp (MIL) Control Circuit Low Voltage

DTC P263B

Malfunction Indicator Lamp (MIL) Control Circuit High Voltage

Diagnostic Fault Information

Circuit/System Description

The malfunction indicator lamp (MIL) illuminates to inform the driver that an emission system fault has occurred and the powertrain control system requires service. Ignition voltage is supplied directly to the MIL. The engine control module (ECM) turns the MIL ON by grounding the MIL control circuit when the emission system fault occurs. Under normal operating conditions, the MIL should be ON only when the vehicle is ON and the engine is OFF.

Conditions for Running the DTC

The ignition is ON or the engine is running. The ignition voltage is greater than 11 V.

The DTCs run continuously when the above conditions are met.

Conditions for Setting the DTC

DTC P0650 or DTC P263A

The ECM detects low voltage during the MIL control circuit driver OFF state. This indicates either a shorted to ground or an open MIL control circuit.

DTC P263B

The ECM detects high voltage on the MIL control circuit during the driver ON state. This indicates a shorted to voltage MIL control circuit.

Action Taken When the DTC Sets

DTC P0650, P263A, and P263B are type B DTCs, with no MIL request

Conditions for Clearing the DTC

DTC P0650, P263A, and P263B are type B DTCs, with no MIL request.

Diagnostic Aids

If the ECM detects low voltage on the MIL control circuit during the control circuit driver OFF state, DTCs P0650 and DTC P263A may set simultaneously.

Reference Information

Schematic Reference

Engine Controls Schematics

Instrument Cluster Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

1. Engine Running.

2. Verify that the malfunction indicator lamp turns ON and OFF when commanding the Malfunction Indicator Lamp (MIL) On and Off with a scan tool.

If the malfunction indicator lamp does not turn ON and OFF

Refer to Circuit/System Testing.

If the malfunction indicator lamp turns ON and OFF

3. Operate the vehicle within the conditions for running the DTC. You may also operate the vehicle within the conditions you observed from the Freeze Frame/Failure Records data.

If the DTC sets

Refer to Circuit/System Testing.

If the DTC does not set

4. All OK.

Circuit/System Testing

1. Vehicle OFF, disconnect the X1 harness connector at the P16 Instrument Cluster, vehicle in Service Mode.

2. Verify a test lamp illuminates between the control circuit terminal 16 and B+ when commanding the Malfunction Indicator Lamp (MIL) On and Off with a scan tool.

If the test lamp is always ON

1. Vehicle OFF, remove the test lamp, disconnect the harness connector at the K20 Engine Control Module.

2. Test for infinite resistance between the control circuit and ground.

If less than infinite resistance, repair the short to ground on the circuit.

If infinite resistance, replace the K20 Engine Control Module.

If the test lamp is always OFF

1. Vehicle OFF, remove the test lamp, disconnect the harness connector at the K20 Engine Control Module, vehicle in Service Mode.

2. Test for less than 1 V between the control circuit and ground.

If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V.

3. Vehicle OFF.

4. Test for less than 2 Ω between the control circuit end to end.

If 2 Ω or greater, repair the open high resistance in the circuit. If less than 2 Ω, replace the K20 Engine Control Module.

If the test lamp turns ON and OFF

3. Replace the P16 Instrument Cluster.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Refer to Instrument Cluster Replacement

Refer to Control Module References for engine control module replacement, programming, and setup.

DTC P0685-P0690, P1682, P16A7, P16AF, OR P16B3: ENGINE CONTROLS IGNITION RELAY/IGNITION 1 SWITCH CIRCUIT 2

Diagnostic Instructions

Perform the Diagnostic System Check prior to using this diagnostic procedure: Diagnostic System Check - Vehicle

Review the description of Strategy Based Diagnosis: Strategy Based Diagnosis

An overview of each diagnostic category can be found here: Diagnostic Procedure Instructions

DTC Descriptor

DTC P0685

Engine Controls Ignition Relay Control Circuit

DTC P0686

Engine Controls Ignition Relay Control Circuit Low Voltage

DTC P0687

Engine Controls Ignition Relay Control Circuit High Voltage

DTC P0689

Engine Controls Ignition Relay Feedback Circuit Low Voltage

DTC P0690

Engine Controls Ignition Relay Feedback Circuit High Voltage

DTC P1682

Ignition 1 Switch Circuit 2

DTC P16A7

Engine Controls Ignition Relay Feedback Circuit 2

DTC P16AF

Engine Controls Ignition Relay Feedback Circuit 2 Low Voltage

DTC P16B3

Engine Controls Ignition Relay Feedback Circuit 2 High Voltage

Diagnostic Fault Information

Circuit/System Description

Components

4 ignition voltage circuits supply the ECM. The 4 circuits are supplied by 2 relay(s): KR73 Ignition Main Relay

KR75 Engine Controls Ignition Relay

The ECM monitors and compares the voltages supplied by the relay(s).

Conditions for Running the DTC

P0685, P0686, P0687

Ignition Voltage = Greater than 11 V

DTCs run continuously when the above condition is met.

P0689, P16AF

Ignition Voltage = Greater than 11 V

Engine Controls Ignition Relay Command = On

DTC runs continuously when the above conditions are met.

P0690, P16B3

DTC P0685 = Not set

Engine Controls Ignition Relay Command = Off - For greater than 2 s

DTC runs continuously when the above conditions are met.

P1682, P16A7

Engine Controls Ignition Relay Command = On Ignition Voltage = Greater than 5.5 V

DTC runs continuously when the above conditions are met.

Conditions for Setting the DTC

P0685, P0686, P0687

The commanded state of the driver and the actual state of the control circuit do not match for greater than 2 s.

P0689

Engine Controls Ignition Relay Feedback Circuit = Less than 5 V - For greater than 5 s

P0690

Engine Controls Ignition Relay Feedback Circuit = Greater than 4 V - For greater than 5 s

P1682, P16A7

The following parameters are not within 3 V of each other: Ignition 1 Signal

Engine Controls Ignition Relay Feedback Signal

Engine Controls Ignition Relay Feedback 2 Signal

P16AF

Engine Controls Ignition Relay Feedback 2 Signal = Less than 5 V - For greater than 5 s

P16B3

Engine Controls Ignition Relay Feedback 2 Signal = Greater than 4 V - For greater than 5 s

Actions Taken When the DTC Sets

DTCs P0685, P0686, P0687, P0689, P0690, P16AF, P16B3 are Type C DTCs. DTCs P1682, P16A7 are Type A DTCs.

Conditions for Clearing the DTC

DTCs P0685, P0686, P0687, P0689, P0690, P16AF, P16B3 are Type C DTCs. DTCs P1682, P16A7 are Type A DTCs.

Diagnostic Aids

If the condition is intermittent, wiggle the related wiring harnesses and connectors, with the ignition/vehicle on or engine running, while monitoring the scan tool circuit status parameters for the component. The parameters will display if there is a condition with the circuit or a connection.

Reference Information

Schematic Reference

Engine Controls Schematics

Power Distribution Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Electrical Information Reference

Circuit Testing

Connector Repairs

Electrical Center Identification Views

Relay Replacement (Attached to Wire Harness) Relay Replacement (Within an Electrical Center) Testing for Intermittent Conditions and Poor Connections

Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References

Circuit/System Verification

1. Ignition - On/Vehicle - In Service Mode

2. Verify no other DTCs are set.

If other DTCs are set

Refer to: Diagnostic Trouble Code (DTC) List - Vehicle

If no other DTCs are set

3. Ignition/Vehicle - Cycle On and Off

Verify the component produces a clicking sound: KR75 Engine Controls Ignition Relay

If the component does not produce a sound

Refer to: Circuit/System Testing

If the component produces a sound

4. Verify the following parameters are within 3 V of each other: Ignition 1 Signal

Engine Controls Ignition Relay Feedback Signal

If not within 3 V of each other

Refer to: Circuit/System Testing

If within 3 V of each other

5. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

If the DTC sets

Refer to: Circuit/System Testing

If the DTC does not set

6. All OK.

Circuit/System Testing

1. Vehicle Off.

2. Remove the component: KR75 Engine Controls Ignition Relay

3. Verify a test lamp turns On between the test points: B+ circuit terminal 30 & Ground

B+ circuit terminal 85 & Ground

If the test lamp does not turn On

Replace the component: X50A Fuse Block - Underhood

If the test lamp turns On

4. Ignition - On/Vehicle - In Service Mode

5. Connect a test lamp between the test points: Control circuit terminal 86 & B+ circuit

6. Perform the scan tool control function: KR75 Engine Controls Ignition Relay - On and Off Verify the test lamp turns On and Off.

If the test lamp is always Off

1. Ignition/Vehicle - Off & Remove - Test lamp

2. Disconnect the electrical connector: X1 @ K20 Engine Control Module

3. Ignition - On/Vehicle - In Service Mode

4. Test for less than 1 V between the test points: Control circuit terminal 86 @ Relay Socket & Terminal 67 @ Control module harness

If 1 V or greater - Repair the short to voltage on the circuit. If less than 1 V

5. Ignition/Vehicle - Off

6. Test for less than 2 ohms between the test points: Control circuit terminal 86 @ Relay Socket & Terminal 67 @ Control module harness

If 2 ohms or greater - Repair the open/high resistance in the circuit.

If less than 2 ohms - Replace the component: K20 Engine Control Module

If the test lamp is always On

1. Ignition/Vehicle - Off & Remove - Test lamp

2. Disconnect the electrical connector: X1 @ K20 Engine Control Module

3. Test for infinite resistance between the test points: Control circuit terminal 86 @ Relay Socket & Ground

If less than infinite resistance - Repair the short to ground on the circuit.

If infinite resistance - Replace the component: K20 Engine Control Module

If the test lamp turns On and Off

7. Verify the fuse is not open: F4UA Fuse

F17UA Fuse

If the fuse is open

1. Vehicle Off.

2. Disconnect the electrical connector: X1 @ K20 Engine Control Module

3. Test for infinite resistance between the test points: Output terminal @ Fuse & Ground If less than infinite resistance - Repair the short to ground on the circuit.

If infinite resistance - Replace the component: K20 Engine Control Module

If the fuse is not open

8. Ignition - On/Vehicle - In Service Mode

9. Verify a test lamp does not turn On between the test points: KR75 Engine Controls Ignition Relay Terminal 87 & Ground

If the test lamp turns On

10. Disconnect the electrical connector: X1 @ K20 Engine Control Module

11. Test for less than 1 V between the test points:

Control circuit terminal 73 @ Control module harness & Ground Control circuit terminal 16 @ Control module harness & Ground If 1 V or greater - Repair the short to voltage on the circuit.

If the test lamp does not turn On

12. Vehicle Off.

13. Connect a 30 A fused jumper wire between the test points: Control circuit terminal 87 & B+ circuit terminal 30

14. Ignition - On/Vehicle - In Service Mode

15. Verify the scan tool parameter: Engine Controls Ignition Relay Feedback Signal = Within 1 V of the battery voltage

If not within 1 V of the battery voltage

1. Ignition/Vehicle - Off & Remove - Jumper wire(s)

2. Disconnect the electrical connector: X1 @ K20 Engine Control Module

3. Test for less than 2 ohms between the test points:

Control circuit terminal 87 @ Relay Socket & Control circuit terminal 73 @ Control module harness

Control circuit terminal 87 @ Relay Socket & Control circuit terminal 16 @ Control module

harness

If 2 ohms or greater - Repair the open/high resistance in the circuit.

If less than 2 ohms - Replace the component: K20 Engine Control Module

If within 1 V of the battery voltage

16. Test or replace the component: KR75 Engine Controls Ignition Relay

Component Testing

Relay Test

1. Vehicle Off.

2. Remove the component: KR75 Engine Controls Ignition Relay

3. Test for 70 to 110 ohms between the test points: Component terminal 85 & 86

If not between 70 and 110 ohms

Replace the component: KR75 Engine Controls Ignition Relay

If between 70 and 110 ohms

4. Test for infinite resistance between the test points: Component terminal 30 & 85

Component terminal 30 & 86

Component terminal 30 & 87

Component terminal 85 & 87

If less than infinite resistance

Replace the component: KR75 Engine Controls Ignition Relay

If infinite resistance

5. Connect a 3 A fused jumper wire between the test points: Component terminal 86 & B+ Connect a jumper wire between the test points: Component terminal 85 & Ground

6. Test for less than 2 ohms between the test points: Component terminal 30 & 87

If 2 ohms or greater

Replace the component: KR75 Engine Controls Ignition Relay

If less than 2 ohms

7. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair: Diagnostic Repair Verification

Refer to Fuse Block Replacement

Refer to Relay Replacement (Attached to Wire Harness) Relay Replacement (Within an Electrical

Center)

For control module replacement, programming, and setup refer to: Control Module References

DTC P06E4: CONTROL MODULE WAKE-UP CIRCUIT PERFORMANCE (ECM)

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Refer to Diagnostic Procedure Instructions to provide an overview of each diagnostic category.

DTC Descriptor

DTC P06E4

Control Module Wake-Up Circuit Performance

Circuit/System Description

This DTC can set in either the engine control module (ECM) or the Hybrid/EV Powertrain Control Module 2. These modules share the same circuit for this DTC however the criteria and reasons for setting are different. Whenever the propulsion system goes active, the diagnostic reads its internal timer and evaluates the results from the wake-up events that could have occurred.

For each wake-up event the status can be:

Pass - the wake-up event occurred within a window 14 V Power Module

Indeterminate - the ECM was already awake at the time the wake-up event could have occurred Fail - the wake-up event occurred outside a window or did not occur at all

If any of the wake-up events indicate a failure then the DTC fails.

Conditions for Running the DTC

DTC's P0502, P0503, P0722, P0723, P262B, U182D, U0073, U0074 or P2537 is not set.

Drive distance of greater than 0.1 mi.

Conditions for Setting the DTC

Whenever the propulsion system goes active, the ECM diagnostic reads its internal timer and evaluates the results from the wake-up events that could have occurred. The DTC fails if any of the wake-up events did not occur within a specified window:

The 5.0 h wake-up event did not occur from 4.3 to 5.8 h. The 7.0 h wake-up event did not occur from 6.0 to 8.1 h. The 9.5 h wake-up event did not occur from 8.2 to 11.0 h.

Action Taken When the DTC Sets

DTC P06E4 is a type B DTC.

Conditions for Clearing the DTC DTC P06E4 is a type B DTC. Reference Information

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

1. Vehicle in Service Mode.

2. Verify DTC P06E4, P24EF, P24F0, or P24F1 is set in the K114B Hybrid/EV Powertrain Control Module 2.

If any of the DTCs are set

Refer to Diagnostic Trouble Code (DTC) List - Vehicle .

If none of the DTCs are set

Replace the K20 Engine Control Module and perform repair verification.

Repair Verification

1. Drive the vehicle for greater than 0.1 mi.

2. Park the vehicle and let it set for a minimum of 6 h. This allows the ECM to request a K114B Hybrid/EV Powertrain Control Module 2 wake-up to occur.

3. Vehicle in Service Mode.

4. Verify DTC P06E4 did not set.

If DTC is set

Replace the K20 Engine Control Module and repeat steps 1 - 4.

If no DTC's are set

5. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Refer to Control Module References for control module replacement, programming and setup.

DTC P1101: INTAKE AIR FLOW SYSTEM PERFORMANCE

Diagnostic Instructions

Perform the Diagnostic System Check prior to using this diagnostic procedure: Diagnostic System Check - Vehicle

Review the description of Strategy Based Diagnosis: Strategy Based Diagnosis

An overview of each diagnostic category can be found here: Diagnostic Procedure Instructions

DTC Descriptor

DTC P1101

Intake Air Flow System Performance

Circuit/System Description

This system consists of the following components:

The ECM compares the measured mass air flow with the calculated air flow based on throttle position and the calculated air flow based on manifold absolute pressure.

Conditions for Running the DTC

DTC P0101, P0102, P0103, P0106, P0107, P0108, P0111, P0112, P0113, P0116, P0117, P0118, P0128, P0335, P0336 = Not set

Engine Speed = 0 to 5,400 RPM

Engine Coolant Temperature = -7 to +129°C (+19 to +264°F) Intake Air Temperature Sensor = -20 to +125°C (-4 to +257°F)

DTC runs continuously when the above conditions are met.

Conditions for Setting the DTC

The difference between the air flow measured by the mass air flow sensor and a calculated value based on the throttle position exceeds the allowed range.

Actions Taken When the DTC Sets DTC P1101 is a Type B DTC. Conditions for Clearing the DTC DTC P1101 is a Type B DTC. Reference Information

Schematic Reference

Engine Controls Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References

Circuit/System Verification

1. Vehicle in Service Mode.

2. Verify DTC P0641, P0651, P0697, P06A3 is not set.

If any of the DTCs are set

Refer to: DTC P0641, P0651, P0697, P06A3, or P06D2

If none of the DTCs are set

3. Verify the scan tool parameter: Throttle Body Idle Air Flow Compensation = Less than 90%

If 90% or greater

Refer to: Throttle Body Inspection and Cleaning

If less than 90%

4. Perform a component sweep test: Throttle Sweep

Verify the scan tool parameter: Throttle Position Sensors 1 and 2 = Agree

If not the specified state

Refer to: DTC P0121-P0123, P0222, P0223, P16A0-P16A2, or P2135

If the specified state

5. Determine the current vehicle testing altitude.

6. Verify the scan tool parameter: MAP Sensor = Altitude Versus Barometric Pressure If not in the specified range

Refer to: DTC P0106

If in the specified range

7. Verify the following conditions do not exist: Vacuum leak at the component:

Intake Manifold

B74 Manifold Absolute Pressure Sensor Q38 Throttle Body

An object is blocking the component: Q38 Throttle Body

Restrictions in the intake system.

Loose clamps, cracks, or other damages to the intake system.

Water intrusion at the mass air flow sensor.

Contamination of the measuring element of the mass air flow sensor.

Missing, restricted or leaking exhaust components. - Refer to: Symptoms - Engine Exhaust

An engine mechanical condition. - Refer to: Symptoms - Engine Mechanical If a condition is found

Repair or replace component as appropriate.

If no condition is found

8. Engine idling.

9. Verify the scan tool parameter: MAP Sensor = 26 and 52 kPa (3.8 and 7.5 PSI) and changes - The value should change with accelerator pedal input.

If not between 26 and 52 kPa (3.8 and 7.5 PSI) or does not change

Refer to: DTC P0106

If between 26 and 52 kPa (3.8 and 7.5 PSI) and changes

10. Engine = At normal operating temperature.

11. Engine Speed = 1,375 to 1,425 RPM

12. Verify the scan tool parameter: MAF Sensor = 1,800 and 2,400 Hz

If not between 1,800 and 2,400 Hz

Refer to: DTC P0101

If between 1,800 and 2,400 Hz

13. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

14. Verify that no DTCs are set.

If any DTC is set

Refer to: Diagnostic Trouble Code (DTC) List - Vehicle

If no DTC is set

15. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair: Diagnostic Repair Verification

For control module replacement, programming, and setup refer to: Control Module References DTC P111E: ENGINE COOLANT TEMPERATURE SENSOR NOT PLAUSIBLE

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Refer to Diagnostic Procedure Instructions to provide an overview of each diagnostic category.

DTC Descriptor

DTC P111E

Engine Coolant Temperature Sensor Not Plausible

Diagnostic Fault Information

Typical Scan Tool Data

ECT Sensor Temperature

Circuit/System Description

The engine coolant temperature (ECT) sensor is a variable resistor that measures the temperature of the engine coolant. The engine control module (ECM) supplies 5V to the ECT sensor signal circuit and a ground for the low reference circuit.

The purpose of this diagnostic is to determine if the input from the ECT sensor is skewed warmer than normal. The internal clock of the ECM will record the amount of time the engine is OFF. If the required engine OFF time is met at start-up, the ECM will compare the temperature difference between the actual measured ECT and a calibrated ECT model. The information for this model is derived from the previous drive cycle and includes the accumulated mass air flow (MAF), the engine run time, the ambient air temperature and the ECT at the end of the drive cycle.

If the ECM detects that the temperature difference between the measured and modeled ECT is not within an acceptable operating range of each other, then the ECM will continue to run this diagnostic to determine if a block heater was active during the engine OFF time.

Conditions for Running the DTC

DTCs P0111, P0112, P0113, P0114, P0117, P0118, P0128, P0502, P0503, P0601, P1621, or P2610 are

not set.

The vehicle has had a minimum ignition OFF time of 8 hours. The engine is running.

The start-up modeled ECT is colder than 50°C (+122°F). The previous accumulated MAF is greater than 6,000 grams. The previous engine run time is greater than 600 seconds.

OR

The vehicle has had a minimum ignition OFF time of 8 hours. The engine is running.

The previous ECT at engine shutdown is warmer than 75°C (+167°F). The previous accumulated MAF is greater than 6,000 grams.

The previous engine run time is greater than 600 seconds.

This DTC runs once per ignition cycle within the enabling conditions.

Conditions for Setting the DTC

P111E

The ECM detects a temperature difference at initial power-up that indicates that the actual measured ECT is 10°C (18°F) greater than the modeled ECT, and an active block heater has not been detected.

Action Taken When the DTC Sets DTC P111E is a Type B DTC. Conditions for Clearing the MIL/DTC DTC P111E is a Type B DTC. Diagnostic Aids

Engine coolant that is leaking through the sensor will create a high resistance short to ground. This condition results in less voltage on the ECT sensor signal circuit, which is interpreted by the ECM as a warmer ECT.

The ECM memory which includes the ignition OFF timer is maintained by battery power. If the ECM or the battery are disconnected for less than 15 seconds the proper operation of the ECM memory and the timer can be disrupted. Always disconnect these components for greater than 30 seconds.

A failed start due to low battery voltage may cause P111E to set when ambient temperature is below

-7°C (19°F) and a block heater has been use. If this occurs clear the DTC and operate the vehicle within the Conditions for Running the DTC, if P111E sets refer to Circuit/System Verification.

Reference Information

Schematic Reference

Engine Controls Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

1. Verify the cooling system is filled to the correct coolant level. Refer to Cooling System Leak Testing , and Cooling System Draining and Filling

If the coolant level is not filled to the correct level

Repair as necessary.

If the coolant level is correct

2. Verify that DTC P00B3, P00B4, P0111, P0112, P0113, P0114, P0117, P0118, P0128, P0601, P112F,

P1621, or P2610 is not set.

If DTC P00B3, P00B4, P0111, P0112, P0113, P0114, P0117, P0118, P0128, P0601, P112F,

P1621, or P2610 is set

Refer to Diagnostic Trouble Code (DTC) List - Vehicle

If DTC P00B3, P00B4, P0111, P0112, P0113, P0114, P0117, P0118, P0128, P0601, P112F,

P1621, or P2610 is not set

3. Vehicle OFF for a minimum of 8 hours.

4. Vehicle in Service Mode

5. Verify with a scan tool that IAT Sensor 1, Radiator Coolant Temperature Sensor, Ambient Temperature Sensor and the ECT Sensor are within 15°C (59°F) of each other.

If the Radiator Coolant Temperature Sensor parameter is not within 15°C (59°F) of the ECT Sensor and IAT Sensor 1 or ambient temperature.

Perform the diagnostic for DTC P00B3 or P00B4, Refer to Diagnostic Trouble Code (DTC) List - Vehicle

If the IAT Sensor 1 parameter is not within 15°C (59°F) of the ECT Sensor and Radiator Coolant Temperature Sensor or ambient temperature.

Perform the diagnostic for DTC P0112, P0113, or P0114, Refer to Diagnostic Trouble Code (DTC) List - Vehicle

If the ECT Sensor parameter is not within 15°C (59°F) of the IAT Sensor 1 and Radiator Coolant Temperature Sensor or ambient temperature.

Refer to Circuit/System Testing.

If all the parameters are within 15°C (59°F) of each other and ambient temperature.

6. Vehicle OFF.

7. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

8. Verify the DTC does not set.

If the DTC sets

Refer to Circuit/System Testing.

If the DTC does not set

9. All OK.

Circuit/System Testing

1. Vehicle OFF and all vehicle systems OFF, disconnect the B34 Engine Coolant Temperature Sensor harness connector at the sensor. It may take up to 2 minutes for all vehicle systems to power down.

2. Test for less than 5 Ω between the low reference circuit terminal 2 and ground.

If 5 Ω or greater

1. Vehicle OFF, disconnect the harness connector at the K20 Engine Control Module.

2. Test for less than 2 Ω in the low reference circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit. If less than 2 Ω, replace the K20 Engine Control Module.

If less than 5 Ω

3. Vehicle in Service Mode.

4. Verify the scan tool ECT Sensor parameter is colder than -39°C (-38°F).

If warmer than -39°C (-38°F)

1. Vehicle OFF, disconnect the harness connector at the K20 Engine Control Module.

2. Test for infinite resistance between the signal circuit terminal 1 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance.

3. Test for less than 2 Ω in the signal circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit. If less than 2 Ω, replace the K20 Engine Control Module

If colder than -39°C (-38°F)

5. Install a 3 A fused jumper wire between the signal circuit terminal 1 and the low reference circuit terminal 2.

6. Verify the scan tool ECT sensor parameter is warmer than 149°C (300°F).

If warmer than 149°C (300°F)

1. Vehicle OFF, remove the jumper wire, disconnect the harness connector at the K20 Engine Control Module, Vehicle in Service Mode.

2. Test for less than 1 V between the signal circuit and ground.

If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V

7. Test or replace the B34 Engine Coolant Temperature Sensor.

Component Testing

1. Vehicle OFF, disconnect the harness connector at the B34 Engine Coolant Temperature Sensor.

2. Test the ECT sensor by varying the sensor temperature while measuring the sensor resistance. Compare the readings with the Temperature Versus Resistance (Engine Coolant Temperature Sensor) table. The resistance values should be in range of the table values.

If not within the specified range

Replace the B34 Engine Coolant Temperature Sensor.

If within the specified range

3. Test for infinite resistance between each terminal and the sensor housing.

If less than infinite resistance

Replace the B34 Engine Coolant Temperature Sensor.

If infinite resistance

4. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Refer to Engine Coolant Temperature Sensor Replacement - Water Outlet

Refer to Control Module References for K20 engine control module (ECM) replacement, programming, and setup.

DTC P1255: FUEL PUMP CONTROL MODULE DRIVER HIGH TEMPERATURE

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Refer to Diagnostic Procedure Instructions to provide an overview of each diagnostic category.

DTC Descriptors

DTC P1255

Fuel Pump Control Module Driver High Temperature

Circuit/System Description

The engine control module (ECM) supplies voltage to the fuel pump driver control module when the ECM detects that the ignition is on. The voltage from the ECM to the fuel pump driver control module remains active

for 2 s, unless the engine is in crank or run. While this voltage is being received, the fuel pump driver control module supplies a varying voltage to the fuel tank fuel pump module in order to maintain the desired fuel pressure.

Conditions for Running the DTC

The ignition voltage is between 9 - 32 V. The engine is cranking or running.

The fuel pump enable circuit is commanded ON.

The DTC runs continuously when the conditions above are met.

Conditions for Setting the DTC

The fuel pump driver control module detects a driver temperature greater than or equal to 320°F (160°C) for less than 0.2 s.

Action Taken When the DTC Sets DTC P1255 is a Type B DTC. Conditions for Clearing the DTC DTC P1255 is a Type B DTC. Diagnostic Aids

Using the Failure Records data may help locate an intermittent condition. If you cannot duplicate the DTC, the information in the Failure Records can help determine how many miles since the DTC set. The Fail Counter and Pass Counter can help determine how many ignition cycles that the diagnostic test reported a pass and/or a fail.

Reference Information

Schematic Reference

Engine Controls Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Fuel System Description

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

1. Vehicle in Service Mode.

2. Verify DTC P0231, P0232, or P023F is not set.

If any of the DTCs are set

Refer to Diagnostic Trouble Code (DTC) List - Vehicle .

If none of the DTCs are set

3. Verify that the area where the K111 Fuel Pump Driver Control Module is located is free of debris, clutter, or any insulating material that would cause the fuel pump driver control module to overheat.

If any debris, clutter, or other material is found

1. Clear the area where the K111 Fuel Pump Driver Control Module is located.

2. Clear the DTC and test drive the vehicle.

3. Verify the DTC does not set.

If the DTC sets, replace the K111 Fuel Pump Driver Control Module. If the DTC is not set

4. All OK.

If no debris, clutter, or other material is found

4. Clear the DTC and test drive the vehicle.

5. Verify the DTC does not set.

If the DTC sets

Replace the K111 Fuel Pump Driver Control Module.

If the DTC does not set.

6. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair. Refer to Fuel Pump Power Control Module Replacement

DTC P127C, P128A-P128D, P128F, P16E4, OR P16E5: FUEL RAIL PRESSURE SENSOR 2-1/FUEL RAIL PRESSURE-TEMPERATURE SENSOR/SENSOR COMMUNICATION CIRCUIT 3 VOLTAGE

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Refer to Diagnostic Procedure Instructions to provide an overview of each diagnostic category.

DTC Descriptors

DTC P127C

Fuel Rail Pressure Sensor 2 Circuit Low Voltage

DTC P128A

Fuel Rail Pressure Sensor 1 Internal Performance

DTC P128B

Fuel Rail Pressure Sensor 2 Internal Performance

DTC P128C

Fuel Rail Pressure-Temperature Sensor Temperature 1 Message Incorrect

DTC P128D

Fuel Rail Pressure-Temperature Sensor Temperature 2 Message Incorrect

DTC P128F

Fuel Rail Pressure-Temperature Sensor Pressure Message Incorrect

DTC P16E4

Sensor Communication Circuit 3 Low Voltage

DTC P16E5

Sensor Communication Circuit 3 High Voltage

Diagnostic Fault Information

Typical Scan Tool Data

Fuel Rail Pressure Sensor

Circuit/System Description

The fuel pressure/temperature sensor transmits fuel pressure and temperature information by serial data using the Society of Automotive Engineers (SAE) J2716 Single Edge Nibble Transmission (SENT) protocol. The fuel pressure/temperature sensor internal microprocessor allows 4 separate sensor outputs from one 3 wire sensor.

The engine control module (ECM) supplies the fuel pressure/temperature sensor with a 5 V reference circuit, a low reference circuit, and an asynchronous signal/serial data circuit. The asynchronous signal means communication is only going from the fuel pressure/temperature sensor to the ECM. The ECM decodes the serial data signal into separate voltages.

Conditions for Running the DTC

P127C, P16E4 or P16E5

Ignition is ON.

No DTC clear code.

The DTCs run continuously when the above conditions are met.

P128A or P128B

DTC P128F, P16E4 or P16E5 is not set. Ignition is ON.

The DTCs run continuously when the above conditions are met.

P128C, P128D, or P128F

DTC P16E4 or P16E5 is not set. Ignition is ON.

The DTCs run continuously when the above conditions are met.

Conditions for Setting the DTC

P127C

The engine control module detects the fuel pressure sensor 2 SENT digital read value is less than or equal to 76 for greater than 30 s with the engine running or greater than 10 s with the engine cranking.

P128A

The engine control module detects the fuel pressure sensor 1 SENT digital read value is greater than or equal to 4,089 for greater than 3 s.

P128B

The engine control module detects the fuel pressure sensor 2 SENT digital read value is greater than or equal to 4,089 for greater than 3 s.

P128C

The engine control module detects communication errors on the fuel pressure sensor temperature 1 SENT signal circuit for greater than 1 s.

P128D

The engine control module detects communication errors on the fuel pressure sensor temperature 2 SENT signal circuit for greater than 1 s.

P128F

The engine control module detects fuel pressure sensor SENT signal discrepancies for greater than 3 s.

P16E4

The engine control module detects the fuel pressure sensor SENT signal shorted low for greater than 3 s.

P16E5

The engine control module detects the fuel pressure sensor SENT signal shorted high for greater than 3 s.

Action Taken When the DTC Sets

DTCs P127C, P128A, P128B, P128F, P16E4, and P16E5 are Type A DTCs.

DTCs P128C and P128D are Type B DTCs.

A message center or an indicator displays Propulsion Power is Reduced and Service Stabilitrak.

Conditions for Clearing the DTC

DTCs P127C, P128A, P128B, P128F, P16E4, and P16E5 are Type A DTCs.

DTCs P128C and P128D are Type B DTCs.

Diagnostic Aids

A high resistance condition on the fuel pressure/temperature sensor circuits could cause a DTC to set. Inspect for a contaminated fuel system.

Reference Information

Schematic Reference

Engine Controls Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Powertrain Component View

Powertrain Component Views

Description and Operation

Fuel System Description

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

1. Ignition ON/Vehicle in Service Mode.

2. Verify that DTC P0641, P0651, P0697, or P06A3 is not set.

If any of the DTCs are set

Refer to Diagnostic Trouble Code (DTC) List - Vehicle for further diagnosis.

If none of the DTCs are set

3. Verify that DTC P0182, P0183, P0187, P0188, P111F, P126E, P126F, P127C, P128A, P128B, P128C,

P128D, P128F, P16E4, or P16E5 are not set.

If DTC P128A, P128B, P128C, P128D, or P128F are the only DTCs set

Replace the B310 Fuel Pressure/Temperature Sensor.

If DTC P0183, P0184, P0187, P0188, P111F, P126E, P126F, P127C, P16E4, or P16E5 is set

with any of the DTCs

Refer to Circuit/System Testing.

If none of the DTCs are set

4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

5. Verify the DTC does not set.

If the DTC sets

Refer to Circuit/System Testing.

If the DTC does not set

6. All OK.

Circuit/System Testing

NOTE: Disconnecting the fuel pressure/temperature sensor harness connector causes additional DTCs to set.

1. Ignition/Vehicle OFF, and all vehicle systems OFF, disconnect the harness connector at B310 Fuel Pressure/Temperature Sensor. It may take up to 2 min for all vehicle systems to power down.

2. Test for less than 5 Ω between the low reference circuit terminal 1 and ground.

If 5 Ω or greater

1. Ignition/Vehicle OFF, disconnect the harness connector at the K20 Engine Control Module.

2. Test for less than 2 Ω in the low reference circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit. If less than 2 Ω, replace the K20 Engine Control Module.

If less than 5 Ω

3. Ignition/Vehicle ON.

4. Test for 4.8 - 5.2 V between the 5 V reference circuit terminal 2 and ground.

If less than 4.8 V

1. Ignition/Vehicle OFF, disconnect the harness connector at the K20 Engine Control Module.

2. Test for infinite resistance between the 5 V reference circuit and ground.

If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance

3. Test for less than 2 Ω in the 5 V reference circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit. If less than 2 Ω, replace the K20 Engine Control Module.

If greater than 5.2 V

1. Ignition/Vehicle OFF, disconnect the harness connector at the K20 Engine Control Module, ignition/vehicle ON.

2. Test for less than 1 V between the 5 V reference circuit and ground. If 1 V or greater, repair the short to voltage on the circuit.

If less than 1 V, replace the K20 Engine Control Module.

If between 4.8 - 5.2 V

5. Test for 4.8 - 5.2 V between the signal circuit terminal 3 and ground.

If less than 4.8 V

1. Ignition/Vehicle OFF, disconnect the harness connector at the K20 Engine Control Module.

2. Test for infinite resistance between the signal circuit and ground.

If less than infinite resistance, repair the short to ground on the circuit.

If infinite resistance

3. Test for less than 2 Ω in the signal circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit. If less than 2 Ω, replace the K20 Engine Control Module.

If greater than 5.2 V

1. Ignition/Vehicle OFF, disconnect the harness connector at the K20 Engine Control Module, ignition/vehicle ON.

2. Test for less than 1 V between the signal circuit and ground.

If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K20 Engine Control Module.

If between 4.8 - 5.2 V

6. Replace the B310 Fuel Pressure/Temperature Sensor.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Refer to Fuel Injection Fuel Rail Fuel Pressure Sensor Replacement for B310 Fuel Pressure/Temperature Sensor

Refer to Control Module References for K20 Engine Control Module replacement, programming, and setup

DTC P129E OR P12A8: FUEL PUMP DRIVER CONTROL MODULE SIGNAL MESSAGE COUNTER INCORRECT/FUEL PUMP CONTROL SIGNAL MESSAGE COUNTER INCORRECT

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for a overview of the diagnostic approach.

Refer to Diagnostic Procedure Instructions to provide an overview of each diagnostic category.

DTC Descriptors

DTC P129E

Fuel Pump Driver Control Module Signal Message Counter Incorrect

DTC P12A8

Fuel Pump Control Signal Message Counter Incorrect

Circuit/System Description

The fuel pump power control module is in constant communication with the engine control module (ECM) regarding the operating state of the fuel pump power control system. Serial data messages are sent in a continuously repeating series of rolling counts with associated password protect samples. Each count/sample is assigned a value. When the ECM determines that too many of the counts/samples contain an error value, the ECM sets DTC P129E or P12A8.

Conditions for Running the DTC

The ignition voltage is greater than 7 V.

The DTC runs continuously when the above condition is met.

Conditions for Setting the DTC

The ECM detects an error value for over 1 s.

Action Taken When the DTC Sets

DTC P129E and P12A8 are Type A DTCs.

Conditions for Clearing the DTC

DTC P129E and P12A8 are Type A DTCs.

Diagnostic Aids

An intermittent fault in the CAN circuits will cause the ECM to set DTC P129E or P12A8.

Reference Information

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

NOTE: DTC P129E and P12A8 are informational DTCs.

Diagnose all other engine control module DTCs prior to DTC P129E or P12A8.

1. Verify that no other DTCs are set except for DTC P129E or P12A8.

If any other DTCs are set

Refer to Diagnostic Trouble Code (DTC) List - Vehicle .

If only DTC P129E or P12A8 is set

2. Replace the K111 Fuel Pump Power Control Module.

3. Verify the DTC does not set while operating the vehicle within the Conditions for Running the DTC.

If DTC sets

Replace the K20 Engine Control Module.

If DTC does not set

4. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Refer to Control Module References for K111 Fuel Pump Power Control Module and K20 Engine Control Module replacement, programming, and setup

DTC P129B OR P129C: FUEL PUMP DRIVER CONTROL MODULE SYSTEM VOLTAGE

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Refer to Diagnostic Procedure Instructions to provide an overview of each diagnostic category.

DTC Descriptors

DTC P129B

Fuel Pump Driver Control Module System Voltage Low Voltage

DTC P129C

Fuel Pump Driver Control Module System Voltage High Voltage

Diagnostic Fault Information

Circuit/System Description

The fuel pump driver control module monitors the battery positive voltage circuit to verify the voltage is between the normal operating range. The DTC can set for a circuit or system voltage out of range.

Conditions for Running the DTC

P129B

The engine is running.

The ignition voltage is between 9 - 32 V.

The fuel pump enable circuit is commanded ON.

The DTC runs continuously when the above conditions are met.

P129C

The engine is not running.

The ignition voltage is between 9 - 32 V.

The fuel pump enable circuit is commanded ON.

The DTC runs continuously when the above conditions are met.

Conditions for Setting the DTC

P129B

The fuel pump driver control module detects the battery positive voltage is less than 7 V for 1 s.

P129C

The fuel pump driver control module detects the battery positive voltage is greater than 18 V for 1 s.

Action Taken When the DTC Sets

DTC P129B and P129C are Type C DTCs.

Conditions for Clearing the DTC

DTC P129B and P129C are Type C DTCs.

Reference Information

Schematic Reference

Engine Controls Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Fuel System Description

Electrical Information Reference

Circuit Testing

Connector Repairs

Electrical Center Identification Views

Testing for Intermittent Conditions and Poor Connections Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

1. Vehicle OFF.

2. Test for 12.4 - 12.8 V at the battery terminals and record the reading. The battery voltage should stabilize after a few minutes of turning the Vehicle OFF.

If not between 12.4 V - 12.8 V

Refer to Battery Inspection/Test .

If between 12.4 V - 12.8 V

3. Engine Running, accessories OFF.

4. Test for 13.4 - 15 V at the battery terminals and record the reading.

If not between 13.4 - 15 V

Refer to Charging System Test .

If between 13.4 - 15 V

5. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

6. Verify the DTC does not set.

If the DTC sets

Refer to Circuit/System Testing.

If the DTC does not set

7. All OK.

Circuit/System Testing

1. Vehicle OFF and all vehicle systems OFF, disconnect the harness connector at the K111 Fuel Pump Driver Control Module. It may take up to 2 min for all vehicle systems to power down.

2. Test for less than 5 Ω between the ground circuit terminal 9 and ground.

If 5 Ω or greater

1. Vehicle OFF.

2. Test for less than 2 Ω in the ground circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit.

If less than 2 Ω, repair the open/high resistance in the ground connection.

If less than 5 Ω

3. Verify a test lamp illuminates between the B+ circuit terminal 1 and ground.

If the test lamp does not illuminate and the circuit fuse is good

1. Vehicle OFF, remove the test lamp.

2. Test for less than 2 Ω in the B+ circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit.

If less than 2 Ω, verify the fuse is not open and there is voltage at the fuse.

If the test lamp does not illuminate and the circuit fuse is open

1. Vehicle OFF, remove the test lamp.

2. Test for infinite resistance between the B+ circuit and ground.

If less than infinite resistance, repair the short to ground on the circuit.

If infinite resistance, replace the K111 Fuel Pump Driver Control Module.

If the test lamp illuminates

4. Replace the K111 Fuel Pump Driver Control Module.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Refer to Control Module References for Fuel Pump Power Control Module replacement, programming, and setup

DTC P129D: FUEL PUMP DRIVER CONTROL MODULE IGNITION ON/START SWITCH CIRCUIT LOW VOLTAGE

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Refer to Diagnostic Procedure Instructions to provide an overview of each diagnostic category.

DTC Descriptor

DTC P129D

Fuel Pump Driver Control Module Ignition On/Start Switch Circuit Low Voltage

Diagnostic Fault Information

Circuit/System Description

The fuel pump driver control module monitors the ignition voltage circuit in order to determine if the voltage is within the normal operating range.

Conditions for Running the DTC

The DTC runs continuously when the modules are awake.

Conditions for Setting the DTC

The fuel pump driver control module Power Mode does not agree with the engine control module (ECM) Power Mode for 1 s.

Action Taken When the DTC Sets DTC P129D is a Type B DTC. Conditions for Clearing the DTC DTC P129D is a Type B DTC. Reference Information Schematic Reference

Engine Controls Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Fuel System Description

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

1. Vehicle in Service Mode.

2. Verify DTC P0562 is not set.

If the DTC sets

Refer to DTC B1325, B1330, B1517, C0800, C0899, C0900, C12E1, C12E2, P0561-P0563, P1A0C, P1A0D, or P1EFC .

If the DTC does not set

3. Verify DTC P129D is not set.

If the DTC sets

Refer to Circuit/System Testing.

If the DTC does not set

4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

5. Verify DTC P129D is not set.

If the DTC sets

Refer to Circuit/System Testing.

If the DTC does not set

6. All OK.

Circuit/System Testing

NOTE: Circuit/System Verification must be performed first or misdiagnosis may result.

1. Vehicle OFF, all vehicle systems OFF, disconnect the harness connector at the K111 Fuel Pump Driver Control Module. It may take up to 2 min for all vehicle systems to power down.

2. Vehicle in Service Mode.

3. Verify a test lamp illuminates between the ignition circuit terminal 6 and ground.

If the test lamp does not illuminate and the circuit fuse is good

1. Vehicle OFF, remove the test lamp.

2. Test for less than 2 Ω in the ignition circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit.

If less than 2 Ω, verify the fuse is not open and there is voltage at the fuse.

If the test lamp does not illuminate and the circuit fuse is open

1. Vehicle OFF, remove the test lamp, and disconnect all components on the circuit.

2. Test for infinite resistance between the ignition circuit and ground.

If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance

3. Replace the fuse, Vehicle in Service Mode.

4. Verify the fuse is good after connecting each of the components one at a time.

If the fuse opens, replace the component that opens the fuse when connected. If the fuse is good, all OK.

If the test lamp illuminates

4. Replace the K111 Fuel Pump Driver Control Module.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Refer to Control Module References for Fuel Pump Power Control Module replacement, programming, and setup

DTC P12A6: FUEL PUMP DRIVER CONTROL MODULE ENABLE CIRCUIT PERFORMANCE

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Refer to Diagnostic Procedure Instructions to provide an overview of each diagnostic category.

DTC Descriptor

DTC P12A6

Fuel Pump Driver Control Module Enable Circuit Performance

Diagnostic Fault Information

Circuit/System Description

The engine control module (ECM) provides ignition voltage to the fuel pump driver control module whenever the engine is cranking or running. The control module enables the fuel pump driver control module as long as the engine is cranking or running, and ignition system reference pulses are received. While this enable voltage is being received, the fuel pump driver control module supplies a varying voltage to the in-tank fuel pump module in order to maintain the desired fuel line pressure.

Conditions for Running the DTC

The ignition voltage is greater than or equal to 9 V.

The DTC runs continuously when the above condition is met.

Conditions for Setting the DTC

The ECM state of the fuel pump enable circuit does not match the state of the fuel pump enable circuit sensed by the fuel pump driver control module for 1 s.

Action Taken When the DTC Sets DTC P12A6 is a Type A DTC. Conditions for Clearing the DTC DTC P12A6 is a Type A DTC. Reference Information Schematic Reference

Engine Controls Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Fuel System Description

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

1. Vehicle in Service Mode.

2. Verify DTC P12A6 is not set.

If the DTC is set

Refer to Circuit/System Testing.

If the DTC is not set

3. Verify the parameters listed below do not display Malfunction when commanding the Fuel Pump Enable On and Off with a scan tool.

Fuel Pump Enable Circuit Low Voltage Test Status Fuel Pump Enable Circuit Open Test Status

Fuel Pump Enable Circuit High Voltage Test Status

If Malfunction is displayed

Refer to Circuit/System Testing.

If Malfunction is not displayed

4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

5. Verify the DTC does not set.

If the DTC sets

Refer to Circuit/System Testing.

If the DTC does not set

6. All OK.

Circuit/System Testing

1. Vehicle OFF, all vehicle systems OFF, disconnect the harness connector at the K111 Fuel Pump Driver Control Module. It may take up to 2 min for all vehicle systems to power down.

2. Vehicle in Service Mode for greater than 10 s.

3. Verify that a test lamp does not illuminate between the control circuit terminal 2 and ground.

If the test lamp illuminates

1. Vehicle OFF, remove the test lamp, disconnect the harness connector at the K20 Engine Control Module, vehicle in Service Mode.

2. Test for less than 1 V between the control circuit and ground.

If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K20 Engine Control Module.

If the test lamp does not illuminate

4. Remove the test lamp.

5. Verify the scan tool Fuel Pump Enable Circuit Low Voltage Test Status parameter is OK when commanding the Fuel Pump Enable On with a scan tool.

If OK is not displayed

1. Vehicle OFF, disconnect the harness connector at the K20 Engine Control Module.

2. Test for infinite resistance between the control circuit and ground.

If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K20 Engine Control Module.

If OK is displayed

6. Install a 3 A fused jumper wire between the control circuit terminal 2 and ground.

7. Verify the scan tool Fuel Pump Enable Circuit Low Voltage Test Status parameter is Malfunction when commanding the Fuel Pump Enable On with a scan tool.

If Malfunction is not displayed

1. Vehicle OFF, remove the jumper wire, disconnect the harness connector at the K20 Engine Control Module.

2. Test for less than 2 Ω in the control circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit. If less than 2 Ω, replace the K20 Engine Control Module.

If Malfunction is displayed

8. Replace the K111 Fuel Pump Driver Control Module.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Refer to Control Module References for ECM and Fuel Pump Power Control Module replacement, setup, and

programming

DTC P135A: IGNITION COIL SUPPLY VOLTAGE CIRCUIT BANK 1

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Refer to Diagnostic Procedure Instructions to provide an overview of each diagnostic category.

DTC Descriptor

DTC P135A

Ignition Coil Supply Voltage Circuit Bank 1

Diagnostic Fault Information

Circuit/System Description

The ignition system uses an individual ignition coil for each cylinder. The engine control module (ECM) monitors the ignition voltage from the fuse to the individual coils.

Conditions for Running the DTC

Delay starting at ignition On for 5 engine revolutions. Ignition Run/Crank relay voltage is greater than 5 V

PT relay voltage is greater than 11 V

The DTC runs continuously when the above conditions are met.

Conditions for Setting the DTC

The ECM detects less than 2.5 V on the ignition coil supply voltage circuit.

Action Taken When the DTC Sets DTC P135A is a Type B DTC. Conditions for Clearing the DTC DTC P135A is a Type B DTC. Reference Information

Schematic Reference

Engine Controls Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Electronic Ignition System Description

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections Wiring Repairs

Scan Tool Reference

Control Module References

Circuit/System Verification

1. Vehicle in Service Mode.

2. Verify the scan tool Ignition Coil Supply Voltage parameter displays ON.

If ON is not displayed

Refer to Circuit/System Testing.

If ON is displayed

3. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

4. Verify the DTC does not set.

If the DTC sets

Refer to Circuit/System Testing.

If the DTC does not set

5. All OK.

Circuit/System Testing

1. Vehicle OFF, disconnect the X1 harness connector at the K20 Engine Control Module.

2. Connect a 3 A fused jumper wire between the control circuit terminal 67 and ground, vehicle in Service Mode.

3. Verify a test lamp illuminates between the ignition circuit terminal 51 and ground.

If the test lamp does not illuminate and the circuit fuse is good

1. Vehicle OFF, remove the test lamp.

2. Test for less than 2 Ω in the ignition circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit.

If less than 2 Ω, verify the fuse is not open and there is voltage at the fuse.

If the test lamp does not illuminate and the circuit fuse is open

NOTE: The ignition circuit may supply voltage to other components. Make sure to test all circuits and components for a short to ground that share the ignition circuit.

1. Vehicle OFF, remove the test lamp, and disconnect all components on the circuit.

2. Test for infinite resistance between the ignition circuit and ground.

If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance

3. Replace the fuse, vehicle in Service Mode.

4. Verify the fuse is good after connecting each of the components one at a time.

If the fuse opens, replace the component that opens the fuse when connected. If the fuse is good, all OK.

If the test lamp illuminates

4. Replace the K20 Engine Control Module.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Refer to Ignition Coil Replacement

Refer to Control Module References for engine control module replacement, programming, and setup

DTC P1400: COLD START EMISSION REDUCTION CONTROL SYSTEM

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Refer to Diagnostic Procedure Instructions to provide an overview of each diagnostic category.

DTC Descriptor

DTC P1400

Cold Start Emission Reduction Control System

Circuit/System Description

The catalyst must be warmed to efficiently reduce the emissions. The cold start strategy is to reduce the amount

of time it takes to warm the catalyst. During a cold start, the engine spark timing is altered to allow the catalyst to warm quickly. This diagnostic monitors the following to build an exhaust energy model:

Spark advance Engine airflow

Engine coolant temperature Engine run time

The actual model is then compared to the expected exhaust energy model.

Conditions for Running the DTC

DTCs P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0114, P0116, P0117, P0118, P0121, P0122, P0123, P0201, P0202, P0203, P0204, P0222, P0223, P0300, P0301, P0302, P0303, P0304, P0335, P0336, P0351, P0352, P0353, P0354, P0641, P0651, P0697, P06A3, P2122, P2123, P2127,

P2128, P2135, and P2138 are not set.

The engine coolant temperature (ECT) is between -12 to +56°C (10 - 132°F). The calculated 3-way catalyst temperature is colder than 500°C (932°F).

The barometric (BARO) pressure is greater than 75 kPa.

The engine control module (ECM) will exit the diagnostic if the calculated 3-way catalyst temperature is greater than 1,000°C (1832°F) when the engine run time is greater than 17 s.

Vehicle speed is less than 1.6 km/h (1 mph). The accelerator pedal is not depressed.

The ECM will exit the diagnostic if the engine run time is greater than a calibrated value.

This DTC runs within the first 15 s of start-up. This diagnostic runs once per trip when a cold start has been determined.

Conditions for Setting the DTC

The actual exhaust energy model does not match the expected exhaust energy model.

Action Taken When the DTC Sets DTC P1400 is a Type A DTC. Conditions for Clearing the DTC DTC P1400 is a Type A DTC. Reference Information Schematic Reference

Engine Controls Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

1. Vehicle OFF, allow the engine to cool to be within the temperatures listed in the Conditions for Running the DTC.

2. Engine running.

3. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not set. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

4. Verify the DTC does not set.

If the DTC sets

Verify that none of the conditions listed below exists with the air intake system:

Damage, restriction, or modification

Dirty or deteriorating air filter element

Crankcase ventilation system for correct operation Water intrusion

Vacuum leak and other unmetered air downstream of the mass air flow (MAF) sensor Intake manifold leak

If any of the above conditions exist

Repair as necessary.

If none of the conditions exist

5. Verify that none of the conditions listed below exists with the exhaust system: Exhaust leak

Damaged, restricted, or modified exhaust system - Refer to Symptoms - Engine Exhaust .

If any of the conditions exist

Repair as necessary.

If none of the conditions exist

If all of the above conditions test normal, inspect for an engine mechanical condition that could alter the air flow into the combustion chamber. Refer to Symptoms - Engine Mechanical .

If the DTC does not set

6. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

DTC P145C OR P145D: EVAPORATIVE EMISSION (EVAP) SYSTEM LEAK DETECTION PUMP STUCK OFF/ON

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Refer to Diagnostic Procedure Instructions to provide an overview of each diagnostic category.

DTC Descriptors

DTC P145C

Evaporative Emission (EVAP) System Leak Detection Pump Stuck Off

DTC P145D

Evaporative Emission (EVAP) System Leak Detection Pump Stuck On

Circuit/System Description

The evaporative emission (EVAP) system uses a EVAP leak detection pump to test for system leaks. The EVAP leak detection pump assembly consists of the following components:

EVAP leak detection pump with reference orifice EVAP leak detection pump switching valve

EVAP leak detection pump pressure sensor

The EVAP leak detection vacuum pump stuck off test is performed by comparing an initial stabilized EVAP leak detection pump pressure sensor, absolute, reading to a second stabilized reading for a short period of time.

The EVAP leak detection vacuum pump stuck on test is performed after the switching valve transitions from vent to not venting, pump, position. If after the second EVAP leak detection pump pressure sensor reading, a difference between the two pressure readings indicates the EVAP leak detection vacuum pump is stuck on.

Conditions for Running the DTC

P145C and P145D

DTCs P043E, P043F, P0111, P0112, P0113, P0114, P0116, P0117, P0118, P0119, P0128, P0449, P0451, P0452, P0453, P0461, P0462, P0463, P0498, P0499, P0502, P0503, P06E4, P0722, P0723, P111E, P1462, P145C, P145D, P145E, P145F, P2066, P2067, P2068, P2227, P2228, P2229, P2230, P2400, P2401, P2402, P2418, P2419, P2420, P2421, P2422, P2450, P24BA, P24BB, P24B9, P2537, P262B,

U0073, U0074, U0140 and U182D is not set.

The propulsion system is not active. The EVAP purge valve is closed.

The EVAP vent solenoid valve is closed.

The EVAP leak detection pump switching valve is in the vent position. The EVAP leak detection pump vacuum pump is ON.

The odometer greater than 16 km (10 mi).

The barometric pressure (BARO) is between 70 - 110 kPa (10 - 16 PSI). The fuel level is between 10 - 90%.

The engine coolant temperature is less than 40°C (104°F).

The intake air temperature is between 4 - 45°C (39 - 113°F). The system voltage is greater than 10 V.

The vehicle speed is less than 1.6 km/h (1 MPH). No Vehicle ON during test.

The refueling request button is not pressed. A service bay test is not active.

The device control is not active.

There are three possible time windows for this test to run. Up to that point and through this time period the propulsion system must not be active. These time windows are: 5.0, 7.0 or 9.5 hours.

Conditions for Setting the DTC

P145C

The EVAP leak detection pump is commanded ON during the first reference orifice vacuum measurement and the stabilized EVAP leak detection pump pressure sensor vacuum reading is less than 0.1 kPa (0.01 PSI) for greater than 6 min.

Or

The EVAP leak detection pump is commanded ON during the second reference orifice vacuum measurement and the stabilized EVAP leak detection pump pressure sensor vacuum reading is less than 0.1 kPa (0.01 PSI) for greater than 30 s.

P145D

The EVAP leak detection pump is commanded OFF for the first time and the EVAP leak detection pump switching valve has transitioned from vent to not venting, pump position. The difference between an initial EVAP leak detection pump pressure sensor reading and a second EVAP leak detection pump pressure sensor reading is greater than 1 kPa (0.14 PSI) for greater than 8 s.

Or

The EVAP leak detection pump is commanded OFF for the second time and the EVAP leak detection pump pressure sensor vacuum reading is greater than 1.18 kPa (0.17 PSI) for greater than 14 s.

Action Taken When the DTC Sets

DTCs P145C and P145D are Type B DTCs.

Conditions for Clearing the DTC

DTCs P145C and P145D are Type B DTCs.

Reference Information

Schematic Reference

Engine Controls Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Powertrain Component View

Powertrain Component Views

Description and Operation

Evaporative Emission Control System Description

Hybrid Modes of Operation Description

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

1. Vehicle in Service Mode.

2. Verify the scan tool EVAP Leak Detection Pump Pressure parameter compared against the conditions for

setting

If not the specified range

Replace the Q63 Evaporative Emission System Leak Detection Pump Assembly

If within specified range

3. Verify that DTCs P2400, P2401 or P2402 is not set.

If any of the DTCs are set

Refer to Diagnostic Trouble Code (DTC) List - Vehicle .

If no DTCs are set .

4. Inspect for any aftermarket devices added that might have been spliced into the wire harness circuits that control the EVAP leak detection pump.

Aftermarket devices found

Remove or repair as necessary

No aftermarket devices found

5. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

6. Verify the DTC does not set.

If the DTCs set

Refer to Circuit System Testing.

If the DTC do not set

7. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Refer to Evaporative Emission System Vacuum Leak Detection Pump Replacement

DTC P145E: EVAPORATIVE EMISSION (EVAP) SYSTEM LEAK DETECTION PUMP TO VENT SOLENOID VALVE LEAK DETECTED

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Refer to Diagnostic Procedure Instructions to provide an overview of each diagnostic category.

DTC Descriptors

DTC P145E

Evaporative Emission (EVAP) System Leak Detection Pump to Vent Solenoid Valve Leak Detected

Circuit/System Description

The EVAP system uses a EVAP leak detection pump to test for system leaks. The EVAP leak detection pump assembly consists of the following components:

EVAP leak detection pump with reference orifice EVAP leak detection pump switching valve

EVAP leak detection pump pressure sensor

This DTC sets when the ECM detects a 0.51 mm (0.020 in) external leak between the EVAP leak detection pump and the EVAP vent solenoid valve or an internal leak through the EVAP vent solenoid valve.

Conditions for Running the DTC

DTCs P043E, P043F, P0111, P0112, P0113, P0114, P0116, P0117, P0118, P0119, P0128, P0449, P0451, P0452, P0453, P0461, P0462, P0463, P0498, P0499, P0502, P0503, P06E4, P0722, P0723, P111E, P1462, P145C, P145D, P145F, P2066, P2067, P2068, P2227, P2228, P2229, P2230, P2400, P2401, P2402, P2418, P2419, P2420, P2450, P24BA, P24BB, P24B9, P2537, P262B, U0073, U0074, U0140 and

U182D is not set.

The EVAP purge valve is closed.

The EVAP vent solenoid valve transitions to closed.

The EVAP leak detection pump switching valve in not venting, pump position. The EVAP leak detection pump vacuum pump is ON.

The odometer greater than 16 km (10 mi).

The barometric pressure (BARO) is between 70 - 110 kPa (10 - 16 PSI). The fuel level is between 10 - 90%.

The engine coolant temperature is less than 40°C (104°F).

The intake air temperature is between 4 - 45°C (39 - 113°F). The system voltage is greater than 10 V.

The vehicle speed is less than 4.8 km/h (3 MPH). No Vehicle ON during this test

The refueling request button is not pressed. A service bay test is not active.

The device control is not active.

There are three possible time windows for this test to run. Up to that point and through this time period the propulsion system must not be active. These time windows are: 5.0, 7.0 or 9.5 h.

Conditions for Setting the DTC

The ECM detects the vacuum reading is less than the reference vacuum for greater than 30 s.

Action Taken When the DTC Sets DTC P145E is a Type B DTC. Conditions for Clearing the DTC

DTC P145E is a Type B DTC.

Diagnostic Aids

The EVAP system can be filled with smoke at the fresh air side of the vacuum pump using the adapters in the GE-41413-300 .

Smoke seen coming out of the fresh air side of the EVAP leak detection pump assembly is not consider a failed part. This includes the electrical connection port as diagnostics will not detect a leak on the fresh air side of the system.

To help locate intermittent leaks, use the GE-41413-A to introduce smoke into the EVAP system. Move all the EVAP components while observing for smoke with the GE-41413-SPT .

To improve the visibility of the smoke exiting the EVAP system, observe the suspected leak area from different angles with the GE-41413-SPT .

If a small leak is difficult to find, it may be necessary to remove the EVAP components and test them one at a time using the adapters in the GE-41413-300 .

A vent solenoid stuck in the open position will set this DTC. If the solenoid will not respond to the scan tool command, it may be electrically or mechanically inoperable.

Reference Information

Powertrain Component View

Powertrain Component Views

Description and Operation

Evaporative Emission Control System Description Hybrid Modes of Operation Description

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information Special Tools

GE-41413-300 EVAP Cap And Plug Kit

GE-41413-A Evaporative Emissions System Tester

GE-41413-SPT High Intensity White Light

For equivalent regional tools, refer to Special Tools (Diagnostic Tools) Special Tools (Repair Tools) .

Circuit/System Verification

WARNING: Refer to Fuel and Evaporative Emission Pipe Warning .

CAUTION: Refer to Clean, Dry, Low Pressure Gas Source Caution .

1. Verify none of the conditions listed below exist:

Disconnected, incorrectly routed, kinked, or damaged EVAP pipes, O-rings and hoses

A damaged EVAP vent solenoid valve - This could be a shorted solenoid or mechanically stuck.

Refer to Component Testing below.

If a condition exists

Repair as necessary

If no conditions exist

CAUTION: Refer to Fuel and Evaporative Emission Hose/Pipe Connection Cleaning Caution .

NOTE: Refer to the GE-41413-A operation manual for detailed instructions in Evaporative Emission Control System Diagnosis.

2. Disconnect the fresh air tube at the quick connector on the Q63 Evaporative Emission System Leak Detection Pump.

3. Using adapters in the GE-41413-300 , specifically GE-41413-323 , connect the GE-41413-A .

NOTE: Ensure that the vehicle underbody temperature is similar to the ambient temperature and allow the surrounding air to stabilize before starting the diagnostic procedure. The system flow will be less with higher temperatures.

4. Use the flow meter on the GE-41413-A calibrated to 0.51 mm (0.020 in) determine if there is a leak.

If a leak is detected

Use the GE-41413-A to apply smoke to the EVAP system until the leak is located.

If no leak is detected

5. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

If the DTC sets

Refer to Circuit System Testing.

If the DTC does not set

6. All OK.

Circuit/System Testing

NOTE: Ambient and vehicle component temperature must be above 0°C (32°F) to command the switching valve or vacuum pump. This prevents erroneous

results and damage to the EVAP leak detection pump assembly.

1. Record the scan tool EVAP Leak Detection Pump pressure.

2. Command the scan tool EVAP Leak Detection Pump on for 1 min.

1. Record the scan tool EVAP Leak Detection Pump pressure.

2. Subtract the value in step 2.1 from the value in step 1 and record this

3. Command the scan tool EVAP Leak Detection Pump to Vent Solenoid Valve Leak Test for 30 s.

1. Record the scan tool EVAP Leak Detection Pump pressure.

2. Subtract the value in step 3.1 from the value recorded in step 1. Example: Step 1 value 96.6 kPa (14 PSI)

Example: Step 2 value 93.5 kPa (13.6 PSI)

Example: Step 2.2 value 3.1 kPa (0.4 PSI)

Example: Step 3 value 90.69 kPa (13.15 PSI)

Example: Step 3.2 value 5.91 kPa (0.8 PSI)

4. The recommended ratio should be at least 1.50 of the value in step 2.2. Example; step 1 minus step 3 = 5.91 kPa (0.85 PSI)

5.91 kPa (0.85 PSI) divided by 3.1 (0.44 PSI) = 1.90 ratio.

If the ratio fails the recommendation

Inspect and repair for any of the conditions noted under Circuit/System Verification, step 1

If the ratio meets or exceeds the recommendation

5. All OK

Component Testing

1. Connect GE-41413-A using adapter J-41413-323 that is part of GE-41413-300 to the fresh air side of the Q63 Evaporative Emission System Leak Detection Pump.

1. Test the connection between the Q13 Evaporative Emission Vent Solenoid Valve and the Q63 Evaporative Emission System Leak Detection Pump for a leak.

2. The value should be below the 0.020 in H2O value established above in Circuit/System Verification, step 4.

NOTE: Smoke seen coming out of the fresh air side of the EVAP leak detection pump assembly is not consider a failed part. This includes the electrical connection port as diagnostics will not detect a leak on the fresh air side of the system.

3.

If a leak is detected

Repair the affected component

2. Vehicle OFF, disconnect the harness connector at the Q13 Evaporative Emission Vent Solenoid Valve.

3. Test for 25 - 30 Ω between the control terminal 1 and the battery voltage terminal 2.

If not within the specified range

Replace the Q13 Evaporative Emission Vent Solenoid Valve

If within the specified range

NOTE: Use the scan tool Fuel Tank Pressure sensor parameter as a pressure/vacuum reference source.

Review diagnostic aids listed for P0451-P0453 as these could affect further testing.

4. Connect J 41413-323 to the pump side of the Q13 Evaporative Emission Vent Solenoid Valve

5. Test for no air flow through the Q13 Evaporative Emission Vent Solenoid Valve by applying vacuum to the pump side of the valve. It should hold 1 - 2 in Hg (3 - 7 kPa) for 30 s.

If it does not hold vacuum

Replace the Q13 Evaporative Emission Vent Solenoid Valve.

If it does hold vacuum

6. Reconnect the harness connector at the Q13 Evaporative Emission Vent Solenoid Valve, vehicle in Service Mode.

7. Command the scan tool EVAP Vent Solenoid Valve ON and apply vacuum to the pump side of the valve.

8. Verify the Q13 Evaporative Emission Vent Solenoid Valve does not hold vacuum.

If it does hold vacuum

Replace the Q13 Evaporative Emission Vent Solenoid Valve

If it does not hold vacuum

9. All OK

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Refer to Evaporative Emission Canister Control Valve Vacuum Hose Replacement Refer to Evaporative Emission System Vacuum Leak Detection Pump Replacement Refer to Evaporative Emission Canister Vent Solenoid Valve Replacement

DTC P1461: EVAPORATIVE EMISSION (EVAP) SYSTEM PRESSURE INCORRECT DURING FUEL FILL DOOR OPEN REQUEST

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Refer to Diagnostic Procedure Instructions to provide an overview of each diagnostic category.

DTC Descriptor

DTC P1461

Evaporative Emission (EVAP) System Pressure Incorrect During Fuel Fill Door Open Request

Circuit/System Description

The Hybrid/EV Powertrain Control Module 2 (HPCM2) monitors the fuel tank pressure during a fuel fill door open request. If the fuel tank pressure does not fall within a predetermined range within 30 - 120 s this DTC sets.

Conditions for Running the DTC

The HPCM2 is active.

The fuel fill door open switch is pressed.

Conditions for Setting the DTC

The Hybrid/EV Powertrain Control Module 2 detects the fuel tank pressure sensor reading does not fall within a predetermined value for greater than 30 - 120 s.

Action Taken When the DTC Sets The DTC P1461 is a type A DTC. Conditions for Clearing the DTC The DTC P1461 is a type A DTC. Diagnostic Aids

A restriction in the EVAP canister or vent lines that might hold fuel tank pressure could affect this. This DTC will not prevent the fuel fill door from opening.

A vent valve stuck closed could affect this.

Ensure that the reference port on the fuel tank pressure sensor is unobstructed.

Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

Reference Information

Schematic Reference

Engine Controls Schematics Release Systems Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Evaporative Emission Control System Description Hybrid Modes of Operation Description

Fuel Fill Door Description and Operation (Fuel Door)

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit Verification

1. Vehicle in Service Mode, observe and note the fuel tank pressure with a scan tool.

2. Request a refueling event. The fuel tank pressure reading should be at 0 inches of H2O.

If not at specification

Test and repair any vent restriction

If meets specification

3. All OK

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair. Refer to Fuel Tank Pressure Sensor Replacement

Refer to Control Module References for ECM and Hybrid/EV Control Module 2 replacement, programming and setup.

DTC P1462: EVAPORATIVE EMISSION (EVAP) SYSTEM REFERENCE ORIFICE FLOW ERRATIC

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Refer to Diagnostic Procedure Instructions to provide an overview of each diagnostic category.

DTC Descriptors

DTC P1462

Evaporative Emission (EVAP) System Reference Orifice Flow Erratic

Circuit/System Description

The evaporative emission (EVAP) system uses a EVAP leak detection pump to test for system leaks. The EVAP leak detection pump assembly consists of the following components:

EVAP leak detection pump with reference orifice EVAP leak detection pump switching valve

EVAP leak detection pump pressure sensor

The engine control module (ECM) monitors the pressure across the reference orifice with the EVAP leak detection pump pressure sensor. When all conditions are met, the ECM commands the vacuum pump ON and monitors the EVAP leak detection pump pressure sensor. If the ECM detects the pressure is not stabilized, the DTC will set.

Conditions for Running the DTC

DTCs P043E, P043F, P0111, P0112, P0113, P0114, P0116, P0117, P0118, P0119, P0128, P0449, P0451, P0452, P0453, P0461, P0462, P0463, P0498, P0499, P0502, P0503, P06E4, P0722, P0723, P111E, P145C, P145D, P145E, P2066, P2067, P2068, P2227, P2228, P2229, P2230, P2400, P2401, P2402, P2418, P2419, P2420, P2421, P2422, P2450, P24BA, P24BB, P24B9, P2537, P262B, U0073, U0074,

U0140 and U182D is not set.

The vehicle is OFF.

The propulsion system is not active.

The refueling request button is not pressed A service bay test is not active

The purge valve is closed

The vent solenoid valve is closed

The EVAP Leak Detection Pump switching valve is in the vent position The EVAP Leak Detection Pump vacuum pump is ON

The odometer is greater than 16 km (10 mi)

The barometric pressure (BARO) is between 70 - 110 kPa (10 - 16 PSI) The fuel level is between 10 - 90%

The engine coolant temperature is less than 40°C (104°F)

The intake air temperature is between 4 - 45°C (39 - 113°F) The system voltage is greater than 10 V

The vehicle speed less than 4.8 km/h (3 MPH)

There are three possible time windows for this test to run. Up to that point, and through this time period, the propulsion system must not be active. These time windows are: 5.0, 7.0 or 9.5 h.

Conditions for Setting the DTC

The ECM detects the EVAP leak detection pump internal reference test did not successfully complete within a calibrated value.

Action Taken When the DTC Sets DTC P1462 is a Type B DTC. Conditions for Clearing the DTC DTC P1462 is a Type B DTC. Diagnostic Aids

Inspect the tube and clamps from the EVAP leak detection pump to the vent solenoid for damage. A damage/open tube may allow debris to enter the pump and plug the reference orifice.

Remove the EVAP leak detection pump and look inside the pump opening for any debris that could restrict or plug the reference orifice. The reference orifice is a small opening at the 2 o'clock position in the pump vacuum opening. Inspect for missing or damage O-rings.

With the fresh air tube removed from the EVAP leak detection pump assembly, blow controlled air, 5 - 10 PSI, into this tube. There should be air escaping from behind the fuel fill pocket indicating this tube and filter are not restricted.

A switching valve stuck in the pump position can cause insufficient flow.

This part is not serviceable. It is very important that no debris be found in the pump fresh air inlet or vacuum openings, the tube between the vent solenoid valve and EVAP leak detection pump assembly as this could cause a P043E to set.

Reference Information

Powertrain Component View

Powertrain Component Views

Description and Operation

Evaporative Emission Control System Description

Hybrid Modes of Operation Description

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

1. Vehicle in Service Mode.

2. Verify the scan tool EVAP Leak Detection Pump Pressure sensor reading is within the range specified in the Altitude Versus Barometric Pressure table.

3. Record the EVAP Leak Detection Pump Pressure sensor reading.

4. Command the scan tool EVAP Leak Detection Pump ON.

5. Record the EVAP Leak Detection Pump Pressure sensor reading after 6 min. The reading should be 1.18 - 4 kPa (0.17-0.58 PSI) less than the initial reading from step 2.

If not within the specified range

Refer to Circuit/System Testing

If within specified range

6. Record the EVAP Leak Detection Pump Pressure sensor reading after monitoring for an additional 5-10 min.

7. The reading should be 1.18 - 4.5 kPa (0.17-0.58 PSI) less than the initial reading from step 2, and the difference between the step 4 and step 5 readings less than 0.51 kpa (.07 PSI)

If not within the specified range

Refer to Circuit/System Testing

If within specified range

8. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

9. Verify the DTC does not set.

If the DTC sets

Refer to Circuit/System Testing.

If the DTC do not set

10. All OK.

Circuit/System Testing

NOTE: The reference orifice is a small opening at the 2 o'clock position in the pump vacuum opening.

1. Vehicle OFF, remove the Q63 Evaporative Emission System Leak Detection Pump Assembly.

2. Verify the reference orifice within the pump does not have a restriction.

If restricted

Inspect and repair any of the conditions listed below:

The EVAP leak detection pump to the vent solenoid tube and clamps for damage A missing or damage EVAP leak detection pump O-rings

The fresh air tube near the fuel fill pocket for a restriction The fresh air tube for a restriction

If not restricted

Replace the Q63 Evaporative Emission System Leak Detection Pump Assembly.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Refer to Evaporative Emission System Vacuum Leak Detection Pump Replacement

DTC P1426: EXHAUST GAS RECIRCULATION (EGR) VALVE INTERNAL PERFORMANCE

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Refer to Diagnostic Procedure Instructions to provide an overview of each diagnostic category.

DTC Descriptors

DTC P1426

Exhaust Gas Recirculation (EGR) Valve Internal Performance

Circuit/System Description

The exhaust gas recirculation (EGR) valve internal performance DTC indicates that the smart EGR valve has determined that an internal error exists (internal to the EGR valve).

Conditions for Running the DTC

Engine speed is between 700 - 5,900 RPM

The DTC runs continuously when the above conditions are met for greater than 5 s.

Conditions for Setting the DTC

P1426

The EGR valve has broadcast the specific duty cycle to the engine control module to indicate internal error condition exists.

Action Taken When the DTC Sets DTC P1426 is a Type B DTC. Conditions for Clearing the DTC DTC P1426 is a Type B DTC. Reference Information Schematic Reference

Engine Controls Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

1. Vehicle in Service Mode.

2. Verify DTC P1426 is not set.

If DTC P1426 is set

Replace the Q14 Exhaust Gas Recirculation Valve.

If DTC P1426 is not set

3. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

4. Verify DTC P1426 does not set.

If DTC P1426 sets

Replace the Q14 Exhaust Gas Recirculation Valve.

If the DTC does not set

5. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Refer to Exhaust Gas Recirculation Valve Replacement

Refer to Control Module References for ECM replacement, programming, and setup