Dtcs P1602 to P2123: Other Jeep Commander I

Monitor Conditions

1. When Monitored: Ignition on and battery voltage greater than 10 volts.

Set Conditions

1. Set Condition: The PCM has not been programmed.

Possible Causes

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

1. When Monitored: With the engine running after a cycle when a complete engine warm up was achieved, the difference between engine coolant temperature and ambient air temperature less than or equal to 10° C (50° F), and battery voltage greater than 10 volts.

1. Set Condition: This DTC sets if the engine coolant temp does not drop enough or drops too much during engine off time. This DTC may also set if the controller timer is inaccurate. Two Trip Fault. Three good trips to turn off the MIL.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

1. When Monitored: Ignition on.

1. Set Condition: When the PCM recognizes the Primary 5-volt Supply circuit voltage is varying too much too quickly. One Trip Fault. ETC light is flashing.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

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1. 1) ACTIVE DTC Ignition on, engine not running. With a scan tool, select View DTCs. Is the DTC Active at this time? Yes Go to 2) . No Refer to «INTERMITTENT CONDITION»(ref-288287-S02739760862008062000000) Diagnostic Procedure.
2. 2) (F855) PRIMARY 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND Turn the ignition off. Disconnect the C2 PCM harness connector. Disconnect all the Sensors that share the (F855) Primary 5-volt Supply circuit. NOTE: This code can be caused by the improper installation of after market accessories that may be causing excessive noise on the (F855) 5-volt Supply circuit. Measure the resistance between ground and the (F855) Primary 5-volt Supply circuit in the CKP Sensor harness connector. Is the resistance below 100 ohms? Yes Repair the short to ground in the (F855) Primary 5-volt Supply circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 3) .
3. 3) SENSOR SHORTED TO GROUND Connect the C2 PCM harness connector and all the previously disconnected Sensors except for the CKP Sensor harness connector. Ignition on, engine not running. Measure the voltage on the (F855) Primary 5-volt Supply circuit at the Throttle Body harness connector. NOTE: You must Turn the Ignition Off when disconnecting any of the Sensor harness connectors and Turn the Ignition On to check the voltage readings. While monitoring the voltage, disconnect each Sensor harness connector that shares the (F855) Primary 5-volt Supply circuit, one at a time. Does the voltage increase above 4.5 volts when disconnecting any of the Sensor harness connectors? Yes Replace the Sensor that causes the (F855) Primary 5-volt Supply circuit voltage to increase when disconnected. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 4) .
4. 4) 5-VOLT SENSOR Turn the ignition off. Connect all the previously disconnected Sensors except for the CKP Sensor harness connector. Ignition on, engine not running. Measure the voltage on the (F855) Primary 5-volt Supply circuit at the CKP Sensor harness connector. Is the voltage between 4.8 and 5.2 volts? Yes Replace the Crank Position Sensor. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 5) .
5. 5) (F855) PRIMARY 5-VOLT SUPPLY SHORTED TO BATTERY VOLTAGE Turn the ignition off. Disconnect the C2 PCM harness connector. Disconnect all the Sensors that share the (F855) Primary 5-volt Supply circuit. Ignition on, engine not running. Measure the voltage on the (F855) Primary 5-volt Supply circuit in the CKP Sensor harness connector. Is the voltage above 0 volts? Yes Repair the short to battery voltage in the (F855) Primary 5-volt Supply circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 6) .
6. 6) (F855) PRIMARY 5-VOLT SUPPLY CIRCUIT OPEN Turn the ignition off. Reconnect all the sensors that were disconnected in the previous step except for the CKP Sensor harness connector. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool #8815 to perform diagnosis. Measure the resistance in the (F855) Primary 5-volt Supply circuit from the Sensor harness connector to the appropriate terminal of special tool #8815. It may be necessary to perform this test from every sensor that uses the (F855) Primary 5-volt Supply circuit. Is the resistance below 5.0 ohms? Yes Go to 7) . No Repair the open in the (F855) Primary 5-volt Supply circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
7. 7) PCM NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary. Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits. Were there any problems found? Yes Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Replace and program the Powertrain Control Module per Service Information. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .

Scheme 513

1. When Monitored: Ignition on.

1. Set Condition: When the PCM recognizes the Auxiliary 5-volt Supply circuit voltage is varying too much to quickly. One Trip Fault. ETC light is flashing.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

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1. 1) ACTIVE DTC Ignition on, engine not running. With a scan tool, select View DTCs. Is the DTC Active at this time? Yes Go to 2) . No Refer to «INTERMITTENT CONDITION»(ref-288287-S02739760862008062000000) Diagnostic Procedure.
2. 2) (F856) AUXILIARY 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND Turn the ignition off. Disconnect the C1 PCM harness connector. Disconnect all the Sensors that share the (F856) Auxiliary 5-volt Supply circuit. NOTE: This code can be caused by the improper installation of after market accessories that may be causing excessive noise on the (F856) 5-volt Supply circuit. Measure the resistance between ground and the (F856) Auxiliary 5-volt Supply circuit at the CMP Sensor harness connector. Is the resistance below 100 ohms? Yes Repair the short to ground in the (F856) Auxiliary 5-volt Supply circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 3) .
3. 3) SENSOR SHORTED TO GROUND Connect the C1 PCM harness connector and all the previously disconnected Sensors except for the CMP Sensor harness connector. Ignition on, engine not running. Measure the voltage on the (F856) Auxiliary 5-volt Supply circuit in the CMP Sensor harness connector. NOTE: You must Turn the Ignition OFF when disconnecting any of the Sensor harness connectors and Turn the Ignition On to check the voltage readings. While monitoring the voltage, disconnect each Sensor harness connector that shares the (F856) Auxiliary 5-volt Supply circuit, one at a time. Does the voltage increase above 4.5 volts when disconnecting any of the Sensor harness connectors? Yes Replace the Sensor that causes the (F856) Auxiliary 5-volt Supply circuit voltage to increase when disconnected. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 4) .
4. 4) 5-VOLT SENSOR Turn the ignition off. Connect all the previously disconnected Sensors except for the CMP Sensor harness connector. Ignition on, engine not running. Measure the voltage on the (F856) Auxiliary 5-volt Supply circuit in the CMP Sensor harness connector. Is the voltage below 4.5 volts? Yes Go to 5) . No Replace the Cam Position Sensor. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
5. 5) (F856) AUXILIARY 5-VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE Turn the ignition off. Disconnect the C1 PCM harness connector. Disconnect all the Sensors that share the (F856) Auxiliary 5-volt Supply circuit. Ignition on, engine not running. Measure the voltage on the (F856) Auxiliary 5-volt Supply circuit at the CMP Sensor harness connector. Is there any voltage present? Yes Repair the short to voltage in the (F856) Auxiliary 5-volt Supply circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 6) .
6. 6) (F856) AUXILIARY 5-VOLT SUPPLY CIRCUIT OPEN Turn the ignition off. Reconnect all the sensors that were disconnected in the previous step except the CMP Sensor harness connector. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool #8815 to perform diagnosis. Measure the resistance in the (F856) Auxiliary 5-volt Supply circuit from the Sensor harness connector to the appropriate terminal of special tool #8815. It may be necessary to perform this test from every sensor that uses the (F856) Auxiliary 5-volt Supply circuit. Is the resistance below 5.0 ohms? Yes Go to 7) . No Repair the open in the (F856) Auxiliary 5-volt Supply circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
7. 7) PCM NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary. Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits. Were there any problems found? Yes Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Replace and program the Powertrain Control Module per Service Information. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .

Scheme 517

1. When Monitored: Ignition on and engine running.

1. Set Condition: An open or shorted condition in the Hydraulic Fan Solenoid Control circuit is detected by the Front Control Module.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

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Scheme 521

1. 1) HYDRAULIC COOLING FAN OPERATION Ignition on, engine not running. Using the scan tool, perform the Hydraulic Fan Solenoid Test. Does the Hydraulic Cooling Fan operate properly? Yes Refer to «INTERMITTENT CONDITION»(ref-288287-S02739760862008062000000) Diagnostic Procedure. No Go to 2) .
2. 2) (A916) FUSED B+ CIRCUIT CHECK Turn the ignition off. Disconnect the Hydraulic Cooling Fan Module harness connector. Using a 12-volt test light connected to ground, probe the (A916) Fused B+ circuit in the Hydraulic Cooling Fan Module harness connector. Does the test light illuminate brightly? Yes Go to 3) . No Repair the open or short to ground in the (A916) Fused B+ circuit Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
3. 3) (K173) HYDRAULIC RADIATOR FAN SOLENOID CONTROL CIRCUIT OPEN BETWEEN THE FAN AND IPM C2 HARNESS CONNECTOR Disconnect the IPM C2 40 way connector. Measure the resistance of the (K173) Hydraulic Radiator Fan Solenoid control circuit from Fan Module harness connector to the IPM C2 40 way harness connector. Is the resistance below 5.0 ohms? Yes Go to 4) . No Repair the excessive resistance in the (K173) Hydraulic Radiator Fan Solenoid Control circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
4. 4) (K173) HYDRAULIC RADIATOR FAN SOLENOID CONTROL CIRCUIT SHORTED TO GROUND BETWEEN THE FAN AND IPM C2 HARNESS CONNECTOR Measure the resistance between ground and the (K173) Hydraulic Radiator Fan Solenoid Control circuit in the Fan Module harness connector. Is the resistance below 100 ohms? Yes Repair the short to ground in the (K173) Hydraulic Radiator Fan Solenoid Control circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 5) .
5. 5) (K173) HYDRAULIC RADIATOR FAN SOLENOID CONTROL CIRCUIT OPEN BETWEEN THE FAN AND IPM FCM 49 WAY HARNESS CONNECTOR Connect the IPM C2 40 way connector. Disconnect the IPM FCM 49 way harness connector. Measure the resistance of the (K173) Hydraulic Radiator Fan Solenoid control circuit from Fan Module harness connector to the IPM FCM 49 way harness connector. Is the resistance below 5.0 ohms? Yes Go to 6) . No Repair the excessive resistance in the (K173) Hydraulic Radiator Fan Solenoid Control circuit in the IPM. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
6. 6) (K173) HYDRAULIC RADIATOR FAN SOLENOID CONTROL CIRCUIT SHORTED TO GROUND BETWEEN THE FAN AND IPM FCM 49 WAY HARNESS CONNECTOR Measure the resistance between ground and the (K173) Hydraulic Radiator Fan Solenoid Control circuit in the Fan Module harness connector. Is the resistance below 100 ohms? Yes Repair the short to ground in the (K173) Hydraulic Radiator Fan Solenoid Control circuit in the IPM. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 7) .
7. 7) FRONT CONTROL MODULE (FCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Hydraulic Cooling Fan and the Front Control Module (FCM). Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the Hydraulic Cooling Fan and the Front Control Module (FCM) connectors. Refer to any Technical Service Bulletins that may apply. Were there any problems found? Yes Repair as necessary. Perform «BODY VERIFICATION TEST»(ref-288232-S30638820392008062000000) . No Replace and program the Front Control Module per Service Information. Perform «BODY VERIFICATION TEST»(ref-288232-S30638820392008062000000) .

1. When Monitored: Ignition on and engine running.

1. Set Condition: An open or shorted condition in the Hydraulic Fan Solenoid Control circuit is detected by the Front Control Module.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 522

Scheme 523

1. 1) HYDRAULIC COOLING FAN OPERATION Ignition on, engine not running. Using the scan tool, perform the Hydraulic Fan Solenoid Test. Does the Hydraulic Cooling Fan operate properly? Yes Refer to «INTERMITTENT CONDITION»(ref-288287-S02739760862008062000000) Diagnostic Procedure. No Go to 2) .
2. 2) (Z823) GROUND CIRCUIT CHECK Turn the ignition off. Disconnect the Hydraulic Cooling Fan Module harness connector. Using a 12-volt test light connected to B+, probe the (Z823) Ground circuit in the Hydraulic Cooling Fan Module harness connector. Does the test light illuminate brightly? Yes Go to 3) . No Repair the open in the (Z823) Ground circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
3. 3) (K173) HYDRAULIC RADIATOR FAN SOLENOID CONTROL CIRCUIT SHORTED TO VOLTAGE BETWEEN THE FAN AND IPM FCM 49 WAY HARNESS CONNECTOR Disconnect the IPM FCM 49 way connector. Ignition on, engine not running. Measure the voltage on the (K173) Hydraulic Radiator Fan Solenoid control circuit at the Hydraulic Fan Module harness connector. Is the voltage above 0 volts? Yes Go to 4) . No Go to 5) . Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
4. 4) (K173) HYDRAULIC RADIATOR FAN SOLENOID CONTROL CIRCUIT SHORTED TO VOLTAGE IN THE IPM Turn the ignition off. Disconnect the C2 IPM 40 way harness connector. Ignition on, engine not running. Measure the voltage on the (K173) Hydraulic Radiator Fan Solenoid control circuit at the Hydraulic Fan Module harness connector. Is there any voltage present? Yes Repair the short to voltage in the (K173) Hydraulic Radiator Fan Solenoid control circuit between the Hydraulic Cooling Fan Module harness connector and the C2 IPM harness connector. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Replace the Integrated Power Module per Service Information. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
5. 5) FRONT CONTROL MODULE (FCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Hydraulic Cooling Fan and the Front Control Module (FCM). Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the Hydraulic Cooling Fan and the Front Control Module (FCM) connectors. Refer to any Technical Service Bulletins that may apply. Were there any problems found? Yes Repair as necessary. Perform «BODY VERIFICATION TEST»(ref-288232-S30638820392008062000000) . No Replace and program the Front Control Module per Service Information. Perform «BODY VERIFICATION TEST»(ref-288232-S30638820392008062000000) .

1. When Monitored: Continuously with the ignition on.

1. Set Condition: An attempt to program/write to the internal EEPROM failed, Also checks at power down. One Trip Fault. Three good trips to turn off the MIL.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

1. When Monitored: Continuously with the ignition on.

1. Set Condition: The PCM Odometer mileage has not been programmed into the PCM.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

1. When Monitored: Engine running.

1. Set Condition: When the PCM recognizes an internal failure to communicate with the FCM or the CMP and CKP Sensor count periods are too short. One trip fault. ETC light is flashing.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

1. When Monitored: Ignition on.

1. Set Condition: The PCM recognizes the Throttle plate is stuck during extremely cold Ambient Temperature operation. The throttle plate goes through a de-icing procedure. If the throttle blade still doesn't move this fault sets. The MIL will not illuminate. The vehicle will be in Limp home condition, limiting RPM and vehicle speed.

1. When Monitored: During all drive modes

1. Set Condition: If vacuum drops below 1.5" Hg with engine RPM greater than 2000 RPM and closed throttle. One Trip Fault. Three good trips to turn off the MIL.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

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1. 1) ACTIVE DTC NOTE: Diagnose any TP Sensor or MAP Sensor component DTCs before continuing. NOTE: If the P0501 - No Vehicle Speed Signal is set long with this DTC, refer to the «P0501-VEHICLE SPEED SENSOR 1 PERFORMANCE»(ref-288290-S33358922812008062000000) before continuing. NOTE: The throttle plate and linkage should be free from binding and carbon build up. NOTE: Make sure the throttle plate is at the idle position. Ignition on, engine not running. With a scan tool, select View DTCs. Is the DTC Active at this time? Yes Go to 2) . No Refer to «INTERMITTENT CONDITION»(ref-288287-S02739760862008062000000) Diagnostic Procedure.
2. 2) VACUUM LEAK NOTE: This code is enabled on engines with a plastic intake manifold and is intended to shut down the engine if a large crack occurs. NOTE: A large vacuum leak is most likely the cause of this DTC. Inspect the Intake Manifold for leaks and cracks. Inspect the Power Brake Booster for any vacuum leaks. Inspect the PCV system for proper operation and vacuum leaks. Inspect the throttle plate to see if it is bent and will close entirely, if it is bent it may need to be replaced. Inspect the MAP Sensor for proper installation. Verify the engine is free from any mechanical failures. Were any vacuum leaks found? Yes Repair the vacuum leak as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 3) .
3. 3) MAP SENSOR OPERATION Start the engine. With a scan tool, monitor the MAP Sensor voltage. Snap the throttle. Does the MAP Sensor voltage vary from below 2.0 volts at idle to above 3.5 volts at wide open throttle? Yes Go to 4) . No Go to 11) .
4. 4) TP SENSOR OPERATION Ignition on, engine not running. With a scan tool, monitor the TP Sensor voltage while slowly pressing the throttle pedal from closed to wide open throttle. Does voltage start at approximately 0.8 of a volt and go above 3.5 volts with a smooth transition? Yes Refer to «INTERMITTENT CONDITION»(ref-288287-S02739760862008062000000) Diagnostic Procedure. No Go to 5) .
5. 5) EXCESSIVE RESISTANCE IN THE (F855) 5-VOLT SUPPLY CIRCUIT Turn the ignition off. Disconnect the TP Sensor harness connector. Disconnect the C2 PCM harness connector. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool #8815 to perform diagnosis. Measure the resistance of the (F855) 5-volt Supply circuit from the TP Sensor harness connector to the appropriate terminal of special tool #8815. Is the resistance below 5.0 ohms? Yes Go to 6) . No Repair the excessive resistance in the (F855) 5-volt Supply circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
6. 6) (F855) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND Measure the resistance between ground and (F855) 5-volt Supply circuit in the TP Sensor harness connector. Is the resistance below 100 ohms? Yes Repair the short to ground in the (F855) 5-volt Supply circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 7) .
7. 7) THROTTLE POSITION SENSOR Connect the C2 PCM harness connector. Ignition on, engine not running. With a scan tool, monitor the TP Sensor voltage. Connect a jumper wire between the (K22) TP Sensor No. 1 Signal circuit and the (K900) Sensor ground circuit in the Sensor harness connector. Does the TP Sensor voltage change from approximately 4.9 volts to below 0.5 of a volt with the jumper wire installed? Yes Replace the Throttle Position Sensor. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 8) . NOTE: Remove the jumper wire before continuing.
8. 8) EXCESSIVE RESISTANCE IN THE (K22) TP NO. 1 SIGNAL CIRCUIT Turn the ignition off. Disconnect the C2 PCM harness connector. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool #8815 to perform diagnosis. Measure the resistance of the (K22) TP Sensor No. 1 Signal circuit from the TP Sensor harness connector to the appropriate terminal of special tool #8815. Is the resistance below 5.0 ohms? Yes Go to 9) . No Repair the excessive resistance in the (K22) TP Sensor No. 1 Signal circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
9. 9) (K22) TP SENSOR NO. 1 SIGNAL CIRCUIT SHORTED TO GROUND Measure the resistance between ground and the (K22) TP Sensor No. 1 Signal circuit in the TP Sensor harness connector. Is the resistance below 100 ohms? Yes Repair the short to ground in the (K22) TP Sensor No. 1 Signal circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to step 10) .
10. 10) EXCESSIVE RESISTANCE IN THE (K900) SENSOR GROUND CIRCUIT CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool #8815 to perform diagnosis. Measure the resistance of the (K900) Sensor ground circuit from the TP Sensor harness connector to the appropriate terminal of special tool #8815. Is the resistance below 5.0 ohms? Yes Go to 17) . No Repair the excessive resistance in the (K900) Sensor ground circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
11. 11) EXCESSIVE RESISTANCE IN THE (F856) 5-VOLT SUPPLY CIRCUIT Turn the ignition off. Disconnect the MAP Sensor harness connector. Disconnect the C1 PCM harness connector. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool #8815 to perform diagnosis. Measure the resistance of the (F856) 5-volt Supply circuit from the MAP Sensor harness connector to the appropriate terminal of special tool #8815. Is the resistance below 5.0 ohms? Yes Go to 12) . No Repair the excessive resistance in the (F856) 5-volt Supply circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
12. 12) (F856) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND Measure the resistance between ground and the (F856) 5-volt Supply circuit in the MAP Sensor harness connector. Is the resistance above 100k ohms? Yes Go to 13) . No Repair the short to ground in the (F856) 5-volt Supply circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
13. 13) MAP SENSOR Turn the ignition off. Connect the C1 PCM harness connector. Ignition on, engine not running. With a scan tool, monitor the MAP Sensor voltage. Connect a jumper wire between the (K1) MAP Signal circuit and the (K900) Sensor ground circuit. Does the scan tool display MAP voltage from approximately 4.9 volts to below 0.5 of a volt with the jumper wire installed? Yes Replace the MAP Sensor. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 14) . NOTE: Remove the jumper wire before continuing.
14. 14) EXCESSIVE RESISTANCE IN THE (K1) MAP SIGNAL CIRCUIT Turn the ignition off. Disconnect the C2 PCM harness connector. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool #8815 to perform diagnosis. Measure the resistance of the (K1) MAP Signal circuit from the MAP Sensor harness connector to the appropriate terminal of special tool #8815. Is the resistance below 5.0 ohms? Yes Go to 15) . No Repair the excessive resistance in the (K1) MAP Signal circuit Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
15. 15) (K1) MAP SIGNAL CIRCUIT SHORTED TO GROUND Measure the resistance between ground and the (K1) MAP Signal circuit in the MAP Sensor harness connector. Is the resistance below 100 ohms? Yes Repair the short to ground in the (K1) MAP Signal circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to step 16) .
16. 16) EXCESSIVE RESISTANCE IN THE (K900) SENSOR GROUND CIRCUIT CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool #8815 to perform diagnosis. Measure the resistance of the (K900) Sensor ground circuit from the MAP Sensor harness connector to the appropriate terminal of special tool #8815. Is the resistance below 5.0 ohms? Yes Go to 17) . No Repair the excessive resistance in the (K900) Sensor ground circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
17. 17) PCM NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary. Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits. Were there any problems found? Yes Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Replace and program the Powertrain Control Module per Service Information. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .

Scheme 536

1. When Monitored: With the engine running in closed loop mode, the ambient/battery temperature above -6.7° C (20° F) and altitude below 2590.8 m (8500 ft).

1. Set Condition: The conditions that cause this diagnostic to fail is when the upstream O2 sensor becomes biased from an exhaust leak, O2 sensor contamination, or some other extreme operating condition. The downstream O2 sensor is considered to be protected from extreme environments by the catalyst. The PCM monitors the downstream O2 sensor feedback control, called downstream fuel trim, to detect any shift in the upstream O2 sensor target voltage from nominal target voltage. The value of the downstream fuel trim is compared with the lean thresholds. Every time the value exceeds the calibrated threshold, a fail timer is incremented and mass flow through the exhaust is accumulated. If the fail timer and accumulated mass flow exceed the fail thresholds, the test fails and the diagnostic stops running for that trip. If the test fails on consecutive trips, a DTC is set.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

1. When Monitored: With the engine running in closed loop mode, the ambient/battery temperature above -6.7° C (20° F) and altitude below 2590.8 m (8500 ft).

1. Set Condition: The conditions that cause this diagnostic to fail is when the upstream O2 sensor becomes biased from an exhaust leak, O2 sensor contamination, or some other extreme operating condition. The downstream O2 sensor is considered to be protected from extreme environments by the catalyst. The PCM monitors the downstream O2 sensor feedback control, called downstream fuel trim, to detect any shift in the upstream O2 sensor target voltage from nominal target voltage. The value of the downstream fuel trim is compared with the rich thresholds. Every time the value exceeds the calibrated threshold, a fail timer is incremented and mass flow through the exhaust is accumulated. If the fail timer and accumulated mass flow exceed the fail thresholds, the test fails and the diagnostic stops running for that trip. If the test fails on consecutive trips, a DTC is set.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

1. When Monitored: With the engine running in closed loop mode, the ambient/battery temperature above -6.7° C (20° F) and altitude below 2590.8 m (8500 ft). Fuel level greater than 15%.

1. Set Condition: The conditions that cause this diagnostic to fail is when the upstream O2 sensor becomes biased from an exhaust leak, O2 sensor contamination, or some other extreme operating condition. The downstream O2 sensor is considered to be protected from extreme environments by the catalyst. The PCM monitors the downstream O2 sensor feedback control, called downstream fuel trim, to detect any shift in the upstream O2 sensor target voltage from nominal target voltage. The value of the downstream fuel trim is compared with the lean thresholds. Every time the value exceeds the calibrated threshold, a fail timer is incremented and mass flow through the exhaust is accumulated. If the fail timer and accumulated mass flow exceed the fail thresholds, the test fails and the diagnostic stops running for that trip. If the test fails on consecutive trips, a DTC is set.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

1. When Monitored: With the engine running in closed loop mode, the ambient/battery temperature above -6.7° C (20° F) and altitude below 2590.8 m (8500 ft).

1. Set Condition: The conditions that cause this diagnostic to fail is when the upstream O2 sensor becomes biased from an exhaust leak, O2 sensor contamination, or some other extreme operating condition. The downstream O2 sensor is considered to be protected from extreme environments by the catalyst. The PCM monitors the downstream O2 sensor feedback control, called downstream fuel trim, to detect any shift in the upstream O2 sensor target voltage from nominal target voltage. The value of the downstream fuel trim is compared with the lean thresholds. Every time the value exceeds the calibrated threshold, a fail timer is incremented and mass flow through the exhaust is accumulated. If the fail timer and accumulated mass flow exceed the fail thresholds, the test fails and the diagnostic stops running for that trip. If the test fails on consecutive trips, a DTC is set.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

1. When Monitored: With the ignition on and the ETC Motor is not in Limp Home mode.

1. Set Condition: When the PCM detects an internal error or a short between the ETC Motor - and ETC Motor + circuits in the ETC Motor Driver. One trip fault. ETC light is flashing.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 537

Scheme 538

Scheme 539

Scheme 540

Scheme 541

Scheme 542

Scheme 543

1. 1) ACTIVE DTC Ignition on, engine not running. NOTE: If the P2100 is intermittent, it is possible that the controller is overheating in extreme hot temperatures, and this is considered a normal protection operation. No repair is necessary. NOTE: Low battery voltage can also cause excessive current draw, in very hot and very cold ambient temperatures. Make sure the battery can pass a load test before continuing. With a scan tool, select View DTCs. Look closely at the temperatures at which this DTC set. Is the DTC Active at this time? Yes Go to 2) . No Refer to «INTERMITTENT CONDITION»(ref-288287-S02739760862008062000000) Diagnostic Procedure.
2. 2) THROTTLE PLATE INSPECTION Turn the ignition off. Remove the Air Cleaner Assembly from the Throttle Body. Check for any signs of a foreign material (ice or dirt) on the Throttle Plate or in the bore causing the Throttle Plate to stick. Were any signs of foreign material or scoring of the throttle plate or bore found? Yes Remove the debris if possible or replace the Throttle Body Assembly. Disconnect the Battery when replacing the Throttle Body Assembly. After installation is complete, use a scan tool and select the ETC RELEARN function. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 3) .
3. 3) (K124) ETC POSITIVE CIRCUIT SHORTED TO VOLTAGE Turn the ignition off. Disconnect the Throttle Body harness connector. Disconnect the C2 PCM harness connector. Ignition on, engine not running. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool #8815 to perform the diagnostics. Measure the voltage on the (K124) ETC Positive circuit at the appropriate terminal of special tool #8815. Is there any voltage present? Yes Repair the short to voltage on the (K124) ETC Positive circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 4) .
4. 4) (K126) ETC NEGATIVE CIRCUIT SHORTED TO VOLTAGE Measure the voltage on the (K126) ETC Negative circuit at the appropriate terminal of special tool #8815. Is there any voltage present? Yes Repair the short to voltage in the (K126) ETC Negative circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 5) .
5. 5) (K124) ETC POSITIVE CIRCUIT SHORTED TO THE (K126) ETC NEGATIVE CIRCUIT Turn the ignition off. Measure the resistance between the (K124) ETC Positive circuit and the (K126) ETC Negative circuit at the appropriate terminals of special tool #8815. Is the resistance below 100 ohms? Yes Repair the short to between the (K124) ETC Positive circuit and the (K126) ETC Negative circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 6) .
6. 6) (K124) ETC POSITIVE CIRCUIT OPEN Measure the resistance of the (K124) ETC Positive circuit from the Throttle Body harness connector to the appropriate terminal of special tool #8815. Is the resistance below 5.0 ohms? Yes Go to 7) . No Repair the open in the (K124) ETC Positive circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
7. 7) (K124) ETC POSITIVE CIRCUIT SHORTED TO GROUND Measure the resistance between ground and the (K124) ETC Positive circuit between the appropriate terminals of special tool #8815. Is the resistance below 100 ohms? Yes Repair the short to ground in the (K124) ETC Positive circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 8) .
8. 8) (K126) ETC NEGATIVE CIRCUIT OPEN Measure the resistance of the (K126) ETC Negative circuit from the Throttle Body harness connector to the appropriate terminal of special tool #8815. Is the resistance below 5.0 ohms? Yes Go to 9) . No Repair the open in the (K126) ETC Negative circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
9. 9) (K126) ETC NEGATIVE CIRCUIT SHORTED TO GROUND Measure the resistance between ground and the (K126) ETC Negative circuit using the appropriate terminal of special tool #8815. Is the resistance below 100 ohms? Yes Repair the short to ground in the (K126) ETC Negative circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 10) .
10. 10) ETC MOTOR NOTE: Take the following measurement using special tool #8815 to avoid possible damage to the Throttle Body harness connector. Connect the Throttle Body harness connector. Measure the resistance of the ETC Motor between the (K124) ETC Positive circuit and the (K126) ETC Negative circuit at the appropriate terminals of special tool #8815. Is the resistance between 2.5 and 25 ohms at closed throttle? Yes Go to 11) . No Replace the Throttle Body Assembly. Disconnect the Battery when replacing the Throttle Body Assembly. After installation is complete, use a scan tool and select the ETC RELEARN function. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
11. 11) PCM NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary. Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits. Were there any problems found? Yes Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Replace and program the Powertrain Control Module per Service Information. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .

1. When Monitored: With the vehicle running, ETC Motor not in Limp Home mode, and the TPS adaptation is complete.

1. Set Condition: The PCM recognizes too large of an error between the actual position of the Throttle Plate and the Set Point position. One trip fault and the code will set within 5 seconds. Three good trips to turn off the MIL ETC light is flashing.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

1. When Monitored: Ignition on.

1. Set Condition: Internal PCM failure. Module will attempt to reset, so you will be able to hear the throttle relearning. If the condition is continuous, the vehicle may not be driveable. One trip fault. ETC light is flashing.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

1. When Monitored: Ignition on and ETC motor is working.

1. Set Condition: When the PCM requests to limit engine speed if PWM is too high for 20.5 seconds and before P2118 sets. One trip fault and the code will set within 5 seconds. ETC light is illuminated.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 544

Scheme 545

Scheme 546

1. 1) ACTIVE DTC NOTE: When this DTC is Active the engine speed, torque, and vehicle speed are limited to a Limp in mode. Ignition on, engine not running. With a scan tool, select View DTCs. In the Freeze Frame data, look at the temperature at which the fault occurred. If it occurred in extreme cold temperatures, Icing of the throttle body may have caused this code to set. NOTE: Diagnose any TP Sensor faults, 5-Volt Supply faults, and Battery Voltage High or Low DTCs before continuing. Is the DTC Active at this time? Yes Go to 2) . No Refer to «INTERMITTENT CONDITION»(ref-288287-S02739760862008062000000) Diagnostic Procedure.
2. 2) THROTTLE PLATE STUCK Turn the ignition off. Remove the Air Cleaner Assembly from the Throttle Body. Check for any signs of a foreign material (ice or dirt) causing the Throttle to stick. Manually open and close the throttle plate using your hands. Does the Throttle Plate move? Yes Go to 3) . No Remove the debris if possible or replace the Throttle Body Assembly if signs of physical damage are present. Disconnect the Battery when replacing the Throttle Body Assembly. After installation is complete, use a scan tool and select the ETC RELEARN function. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
3. 3) (K124) ETC POSITIVE CIRCUIT OPEN Turn the ignition off. Disconnect the Throttle Body harness connector. Disconnect the C2 PCM harness connector. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool #8815 to perform diagnosis. Measure the resistance of the (K124) ETC Positive circuit from the Throttle Body harness connector to the appropriate terminal of special tool #8815. Is the resistance below 5.0 ohms? Yes Go to 4) . No Repair the open in the (K124) ETC Positive circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
4. 4) (K126) ETC NEGATIVE CIRCUIT OPEN Measure the resistance of the (K126) ETC Negative circuit from the Throttle Body harness connector to the appropriate terminal of special tool #8815. Is the resistance below 5.0 ohms? Yes Go to 5) . No Repair the open in the (K126) ETC Negative circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
5. 5) (K124) ETC POSITIVE CIRCUIT SHORTED TO GROUND Measure the resistance between a known good ground and the (K124) ETC Positive circuit at the appropriate terminal of special tool #8815. Is the resistance below 100 ohms? Yes Repair the short to ground in the (K124) ETC Positive circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 6) .
6. 6) (K126) ETC NEGATIVE CIRCUIT SHORTED TO GROUND Measure the resistance between a known good ground and the (K126) ETC Negative circuit at the appropriate terminal of special tool #8815. Is the resistance below 100 ohms? Yes Repair the short to ground in the (K126) ETC Negative circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 7) .
7. 7) ETC MOTOR NOTE: Take the following measurement using special tool #8815 to avoid possible damage to the Throttle Body harness connector. Measure the resistance of the ETC Motor between the (K124) ETC Positive circuit and the (K126) ETC Negative circuit at the appropriate terminals of special tool #8815. Is the resistance between 2.5 and 25 ohms at closed throttle? Yes Go to 8) . No Replace the Throttle Body Assembly. Disconnect the Battery when replacing the Throttle Body Assembly. After installation is complete, use a scan tool and select the ETC RELEARN function. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
8. 8) PCM NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary. Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits. Were there any problems found? Yes Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Replace and program the Powertrain Control Module per Service Information. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .

1. When Monitored: Ignition on and battery voltage greater than 10 volts.

1. Set Condition: Just after key on, the throttle is opened and closed to test the system. If the TP Sensor does not return to Limp Home Position at the end of this test, this DTC will set. One trip fault and the code will set within 5 seconds. ETC light is flashing.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 547

1. 1) ACTIVE DTC NOTE: Maximum engine speed could be reduced while this fault is active, it just depends where the throttle gets stuck. Ignition on, engine not running. NOTE: The PCM tests the ETC Motor by opening and closing the Throttle Plate before starting the engine. If during this test the Throttle plate does not return to the closed position this DTC sets. With a scan tool, select View DTCs. NOTE: Diagnose any TP Sensor or 5-Volt Supply DTCs before continuing. Is the DTC Active at this time? Yes Go to 2) . No Refer to «INTERMITTENT CONDITION»(ref-288287-S02739760862008062000000) Diagnostic Procedure.
2. 2) THROTTLE PLATE STUCK OPEN Turn the ignition off. NOTE: The PCM tests the ETC Motor by opening and closing the Throttle Plate before starting the engine. If during this test the Throttle plate does not return to the closed position this DTC sets. Remove the Air Cleaner Assembly from the Throttle Body. Check for any signs of a foreign material causing the Throttle to remain open. Using a scan tool, under System Tests, perform the ETC Throttle Follower Test. Have an assistant watch the throttle plate to verify it moves during the test. Does the Throttle Plate move? Yes Go to 3) . No Remove the debris if possible or replace the Throttle Body Assembly if signs of physical damage are present. Disconnect the Battery when replacing the Throttle Body Assembly. After installation is complete, use a scan tool and perform the ETC RELEARN function. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
3. 3) TP SENSOR NO. 1 AND TP SENSOR NO. 2 BOTH EQUAL 2.5 VOLTS With a scan tool, perform the ETC Throttle Follower test while reading both TP Sensor voltage readings. Are both TP Sensor readings stuck at 2.5 volts? Yes Check the TP Sensor Signal circuits for excessive resistance, being shorted to each other, or shorted to the Sensor Return circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 4) .
4. 4) (K124) ETC POSITIVE CIRCUIT SHORTED TO VOLTAGE Turn the ignition off. Disconnect the Throttle Body harness connector. Disconnect the C2 PCM harness connector. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool #8815 to perform the diagnostics. Ignition on, engine not running. Measure the voltage on the (K124) ETC Positive circuit at the appropriate terminal of special tool #8815. Is there any voltage present? Yes Repair the short to voltage on the (K124) ETC Positive circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 5) .
5. 5) (K124) ETC POSITIVE CIRCUIT OPEN Turn the ignition off. Measure the resistance of the (K124) ETC Positive circuit from the Throttle Body harness connector to the appropriate terminal of special tool #8815. Is the resistance below 5.0 ohms? Yes Go to 6) . No Repair the open in the (K124) ETC Positive circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
6. 6) (K126) ETC NEGATIVE CIRCUIT OPEN Measure the resistance of the (K126) ETC Negative circuit from the Throttle Body harness connector to the appropriate terminal of special tool #8815. Is the resistance below 5.0 ohms? Yes Go to 7) . No Repair the open in the (K126) ETC Negative circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
7. 7) (K124) ETC POSITIVE CIRCUIT SHORTED TO GROUND Measure the resistance between a known good ground and the (K124) ETC Positive circuit at the appropriate terminal of special tool #8815. Is the resistance below 100 ohms? Yes Repair the short to ground in the (K124) ETC Positive circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 8) .
8. 8) (K126) ETC NEGATIVE CIRCUIT SHORTED TO GROUND Measure the resistance between a known good ground and the (K126) ETC Negative circuit at the appropriate terminal of special tool #8815. Is the resistance below 100 ohms? Yes Repair the short to ground in the (K126) ETC Negative circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 9) .
9. 9) PCM NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary. Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits. Were there any problems found? Yes Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Replace and program the Powertrain Control Module per Service Information. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .

1. When Monitored: Ignition on and battery voltage greater than 10 volts.

1. Set Condition: Just after key on, the throttle is opened and closed to test the system. If the TP Sensor does not return to Limp Home Position at the end of this test, this DTC will set. One trip fault and the code will set within 5 seconds. ETC light is flashing.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 548

1. 1) ACTIVE DTC Ignition on, engine not running. NOTE: The PCM tests the ETC Motor by opening and closing the Throttle Plate before starting the engine. If during this test the Throttle plate does not return to the closed position this DTC sets. With a scan tool, select View DTCs. NOTE: Diagnose any TP Sensor, Battery Voltage, and 5-Volt Supply DTCs before continuing. Is the DTC Active at this time? Yes Go to 2) . No Refer to «INTERMITTENT CONDITION»(ref-288287-S02739760862008062000000) Diagnostic Procedure.
2. 2) THROTTLE PLATE STUCK OPEN Turn the ignition off. NOTE: The PCM tests the ETC Motor by opening and closing the Throttle Plate before starting the engine. If during this test the Throttle plate does not open this DTC sets. Remove the Air Cleaner Assembly from the Throttle Body. Check for any signs of a foreign material causing the Throttle to remain open. Using a scan tool, under System Tests, perform the ETC Throttle Follower Test. Have an assistant watch the throttle plate to verify it moves during the test. Does the Throttle Plate move? Yes Go to 3) . No Remove the debris if possible or replace the Throttle Body Assembly. Disconnect the Battery when replacing the Throttle Body Assembly. After installation is complete, use a scan tool and select the ETC RELEARN function. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
3. 3) (K126) ETC NEGATIVE CIRCUIT SHORTED TO VOLTAGE Turn the ignition off. Disconnect the Throttle Body harness connector. Disconnect the C2 PCM harness connector. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool #8815 to perform diagnosis. Ignition on, engine not running. Measure the voltage on the (K126) ETC Negative circuit at the appropriate terminal of special tool #8815. Is there any voltage present? Yes Repair the short to voltage on the (K126) ETC Negative circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 4) .
4. 4) (K124) ETC POSITIVE CIRCUIT OPEN Turn the ignition off. Measure the resistance of the (K124) ETC Positive circuit from the Throttle Body harness connector to the appropriate terminal of special tool #8815. Is the resistance below 5.0 ohms? Yes Go to 5) . No Repair the open in the (K124) ETC Positive circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
5. 5) (K126) ETC NEGATIVE CIRCUIT OPEN Measure the resistance of the (K126) ETC Negative circuit from the Throttle Body harness connector to the appropriate terminal of special tool #8815. Is the resistance below 5.0 ohms? Yes Go to 6) . No Repair the open in the (K126) ETC Negative circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
6. 6) (K124) ETC POSITIVE CIRCUIT SHORTED TO GROUND Measure the resistance between a known good ground and the (K124) ETC Positive circuit at the appropriate terminal of special tool #8815. Is the resistance below 100 ohms? Yes Repair the short to ground in the (K124) ETC Positive circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 7) .
7. 7) (K126) ETC NEGATIVE CIRCUIT SHORTED TO GROUND Measure the resistance between a known good ground and the (K126) ETC Negative circuit at the appropriate terminal of special tool #8815. Is the resistance below 100 ohms? Yes Repair the short to ground in the (K126) ETC Negative circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 8) .
8. 8) PCM NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary. Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits. Were there any problems found? Yes Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Replace and program the Powertrain Control Module per Service Information. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .

1. When Monitored: Ignition on. During in plant mode the APP Sensors need to be checked to make sure that idle and full pedal travel can be reached on both sensors. The test for P2115 is only enabled once test for P2166 has passed.

1. Set Condition: APPS No. 1 has failed to achieve the required minimum value during In Plant testing. One trip fault and the code will set within 5 seconds. Engine will only idle. ETC light is illuminated.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

1. When Monitored: Ignition on. During in plant mode the APP Sensors need to be checked to make sure that idle and full pedal travel can be reached on both sensors. The test for P2116 is only enabled once test for P2167 has passed.

1. Set Condition: APPS No. 2 has failed to achieve the required minimum value during In Plant testing. One trip fault and the code will be stored within 5 seconds. Engine will only idle. ETC light is illuminated.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

1. When Monitored: With the ignition on and the ETC Motor is not in Limp Home mode.

1. Set Condition: When the PCM detects an internal error or a short between the ETC Motor- and ETC Motor + circuits in the ETC Motor Driver. One trip fault. ETC light is flashing.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

1. When Monitored: With the ignition on and no other APPS No. 1 DTCs present.

1. Set Condition: When the APP Sensor No. 1 voltage is too low. Engine will additionally idle if the brake pedal is pressed or has failed. Acceleration rate and Engine output are limited. One trip fault and the code will set within 5 seconds. ETC light is flashing.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 549

Scheme 550

Scheme 551

Scheme 552

Scheme 553

Scheme 554

Scheme 555

Scheme 556

1. 1) ACTIVE DTC NOTE: When this DTC is Active the engine speed, torque, and vehicle speed are limited to a Limp in mode. Start the engine and allow it to reach normal operating temperature. WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death. NOTE: Diagnose and repair any system voltage or sensor supply voltage DTCs before continuing with this test. NOTE: If you are viewing data recorder information or Freeze Frame data the APP Sensor No. 2 is pulled low by the PCM as part of its system testing. This test happens every 320 milliseconds and may not show up on the scan tool but may show up on a data recorder or lab scope. It is acceptable to see the voltage close to zero with a normal sensor when using a data recorder/lab scope. With the scan tool, select View DTCs. Is the DTC Active at this time? Yes Go to 2) . No Go to 11) .
2. 2) (F855) 5-VOLT SUPPLY CIRCUIT Turn the ignition off. Disconnect the APP Sensor harness connector. Ignition on, engine not running. Measure the voltage on the (F855) 5-volt Supply circuit in the APP Sensor harness connector. Is the voltage between 4.5 and 5.2 volts? Yes Go to 3) . No Go to 8) .
3. 3) (K23) APP SENSOR NO. 1 SIGNAL CIRCUIT OPEN Turn the ignition off. Disconnect the C3 PCM harness connector. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool #8815 to perform diagnosis. Measure the resistance of the (K23) APP Sensor No. 1 Signal circuit from the APP Sensor harness connector to the appropriate terminal of special tool #8815. Is the resistance below 5.0 ohms? Yes Go to 4) . No Repair the open in the (K23) APP Sensor No. 1 Signal circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
4. 4) (K23) APP SENSOR NO. 1 SIGNAL CIRCUIT SHORTED TO GROUND Measure the resistance between ground and the (K23) APP Sensor No. 1 Signal circuit in the APP Sensor harness connector. Is the resistance below 100 ohms? Yes Repair the short to ground in the (K23) APP Sensor No. 1 Signal circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 5) .
5. 5) (K23) APP SENSOR NO. 1 SIGNAL CIRCUIT SHORTED TO THE (K167) APP SENSOR NO. 1 RETURN CIRCUIT Measure the resistance between the (K23) APP Sensor No. 1 Signal circuit and the (K167) Sensor No. 1 Return circuit at the APP Sensor harness connector. Is the resistance below 100 ohms? Yes Repair the short between the (K167) APP Sensor No. 1 Return circuit and the (K23) APP Sensor No. 1 Signal circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 6) .
6. 6) (K23) APP SENSOR NO. 1 SIGNAL CIRCUIT SHORTED TO THE (K400) APP SENSOR NO. 2 RETURN CIRCUIT Measure the resistance between the (K23) APP Sensor No. 1 Signal circuit and the (K400) APP Sensor No. 2 Return circuit in the APP Sensor harness connector. Is the resistance below 100 ohms? Yes Repair the short between the (K400) APP Sensor No. 2 Return circuit and the (K23) APP Sensor No. 1 Signal circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 7) .
7. 7) ACCELERATOR PEDAL POSITION SENSOR Connect the PCM harness connectors. Ignition on, engine not running. With a scan tool, monitor the APP Sensor No. 1 voltage. Connect a jumper wire between the (F855) 5-volt Supply circuit and the (K23) APP Sensor No. 1 Signal circuit in the Sensor harness connector. NOTE: The sensor voltage should be approximately 5.0 volts (plus or minus .1 volt) with the jumper wire installed. Does the scan tool display the voltage as described above? Yes Verify that there is good pin to terminal contact in the APP Sensor and Powertrain Control Module connectors. If OK, replace the APP Sensor Assembly per Service Information. After installation is complete, use a scan tool and select the ETC RELEARN function to relearn the APPS values. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 10) . NOTE: Remove the jumper wire before continuing.
8. 8) (F855) 5-VOLT SUPPLY CIRCUIT OPEN Turn the ignition off. Disconnect the C2 PCM harness connector. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool #8815 to perform diagnosis. Measure the resistance of the (F855) 5-volt Supply circuit from the Sensor harness connector to the appropriate terminal of special tool #8815. Is the resistance below 5.0 ohms? Yes Go to 9) . No Repair the open in the (F855) 5-volt Supply circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
9. 9) (F855) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND Measure the resistance between ground and the (F855) 5-volt Supply circuit in the APP Sensor harness connector. Is the resistance below 100 ohms? Yes Repair the short to ground in the (F855) 5-volt Supply circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 10) .
10. 10) POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Accelerator Pedal Position Sensor and the Powertrain Control Module (PCM). Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the APP Sensor and Powertrain Control Module connectors. Refer to any Technical Service Bulletins that may apply. Were there any problems found? Yes Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Replace and program the Powertrain Control Module per Service Information. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
11. 11) APP SENSOR SWEEP Ignition on, engine not running. With a scan tool, monitor the APP Sensor 1 voltage. Slowly press the Accelerator pedal down. Does voltage start at approximately 0.45 of a volt and go above 4.6 volts with a smooth transition? Yes Refer to «INTERMITTENT CONDITION»(ref-288287-S02739760862008062000000) Diagnostic Procedure. No Replace the APP Sensor Assembly per Service Information. After installation is complete, use a scan tool and select the ETC RELEARN function to relearn the APPS values. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .

1. When Monitored: With the ignition on and no other APPS No. 1 DTCs present.

1. Set Condition: When APP Sensor No. 1 voltage is too high. Engine will additionally idle if the brake pedal is pressed or has failed. Acceleration rate and Engine output are limited. One trip fault and the code will set within 5 seconds. ETC light is flashing.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 557

Scheme 558

Scheme 559

Scheme 560

1. 1) ACTIVE DTC NOTE: When this DTC is Active the engine speed, torque, and vehicle speed are limited to a Limp in mode. Start the engine and allow it to reach normal operating temperature. WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death. NOTE: Diagnose and repair any system voltage or sensor supply voltage DTCs before continuing with this test. NOTE: If you are viewing data recorder information or Freeze Frame data the APP Sensor No. 2 is pulled low by the PCM as part of its system testing. This test happens every 320 milliseconds and may not show up on the scan tool but may show up on a data recorder or lab scope. It is acceptable to see the voltage close to zero with a normal sensor when using a data recorder/lab scope. With the scan tool, select View DTCs. Is the DTC Active at this time? Yes Go to 2) . No Go to 8) .
2. 2) (K23) APP SENSOR NO. 1 SIGNAL CIRCUIT SHORTED TO VOLTAGE Turn the ignition off. Disconnect the PCM harness connectors. Disconnect the APP Sensor harness connector. Ignition on, engine not running. Measure the voltage on the (K23) APP Sensor No. 1 Signal circuit in the APP Sensor harness connector. Is there any voltage present? Yes Repair the short to voltage in the (K23) APP Sensor No. 1 Signal circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 3) .
3. 3) (K23) APPS NO. 1 SIGNAL CIRCUIT SHORTED TO THE (F855) 5-VOLT SUPPLY CIRCUIT Turn the ignition off. Measure the resistance between the (K23) APP Sensor No. 1 Signal circuit and the (F855) 5-volt Supply circuit in the APP Sensor harness connector. Is the resistance below 100 ohms? Yes Repair the short between the (K23) APP Sensor No. 1 Signal circuit and the (F855) 5-volt Supply circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 4) .
4. 4) (K23) APPS NO. 1 SIGNAL CIRCUIT SHORTED TO THE (F856) 5-VOLT SUPPLY CIRCUIT Measure the resistance between the (K23) APP Sensor No. 1 Signal circuit and the (F856) 5-volt Supply circuit in the APP Sensor harness connector. Is the resistance below 100 ohms? Yes Repair the short between the (K23) APP Sensor No. 1 Signal circuit and the (F856) 5-volt Supply circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 5) .
5. 5) (K167) APP SENSOR NO. 1 RETURN CIRCUIT OPEN CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool #8815 to perform diagnosis. Measure the resistance of the (K167) APP Sensor No. 1 Return circuit from the APP Sensor harness connector to the appropriate terminal of special tool #8815. Is the resistance below 5.0 ohms? Yes Go to 6) . No Repair the open in the (K167) APP Sensor No. 1 Return circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
6. 6) ACCELERATOR PEDAL POSITION SENSOR Connect the PCM harness connectors. Ignition on, engine not running. With a scan tool, monitor the APP Sensor 2 voltage. Is the voltage above 0 volts? Yes Go to 7) . No Verify that there is good pin to terminal contact in the APP Sensor and Powertrain Control Module connectors. If OK, replace the APP Sensor Assembly per Service Information. After installation is complete, use a scan tool and select the ETC RELEARN function to relearn the APPS values. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
7. 7) POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Accelerator Pedal Position Sensor and the Powertrain Control Module (PCM). Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the APP Sensor and Powertrain Control Module connectors. Refer to any Technical Service Bulletins that may apply. Were there any problems found? Yes Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Replace and program the Powertrain Control Module per Service Information. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
8. 8) APP SENSOR NO. 1 SWEEP Ignition on, engine not running. With a scan tool, monitor the Accelerator Pedal Position Sensor voltage. Slowly press the Accelerator Pedal down. Does voltage start at approximately 0.45 of a volt and go above 4.6 volts with a smooth transition? Yes Refer to «INTERMITTENT CONDITION»(ref-288287-S02739760862008062000000) Diagnostic Procedure. No Verify that there is good pin to terminal contact in the APP Sensor and Powertrain Control Module connectors. If OK, replace the APP Sensor Assembly per Service Information. After installation is complete, use a scan tool and select the ETC RELEARN function to relearn the APPS values. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .