Dtcs P2127 to P2610: Other Jeep Commander I

Monitor Conditions

1. When Monitored: With the ignition on and no other APPS No. 2 DTCs present.

Set Conditions

1. Set Condition: When the APP Sensor No. 2 voltage is too low. Engine will only 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.

Possible Causes

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

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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) (F856) 5-VOLT SUPPLY CIRCUIT Turn the ignition off. Disconnect the APP Sensor harness connector. Ignition on, engine not running. Measure the voltage on the (F856) 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) (K29) APP SENSOR NO. 2 SIGNAL CIRCUIT OPEN Turn the ignition off. Disconnect the PCM harness connectors. 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 (K29) APP Sensor No. 2 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 (K29) APP Sensor No. 2 Signal circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
4. 4) (K29) APP SENSOR NO. 2 SIGNAL CIRCUIT SHORTED TO GROUND Measure the resistance between ground and the (K29) APP Sensor No. 2 Signal circuit in the APP Sensor harness connector. Is the resistance below 100 ohms? Yes Repair the short to ground in the (K29) APP Sensor No. 2 Signal circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 5) .
5. 5) (K29) APP SENSOR NO. 2 SIGNAL CIRCUIT SHORTED TO THE (K400) APP SENSOR NO. 2 RETURN CIRCUIT Measure the resistance between the (K29) APP Sensor No. 2 Signal circuit and the (K400) 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 (K29) APP Sensor No. 2 Signal circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 6) .
6. 6) (K29) APP SENSOR NO. 2 SIGNAL CIRCUIT SHORTED TO THE (K167) APP SENSOR NO. 1 RETURN CIRCUIT Measure the resistance between the (K29) APP Sensor No. 2 Signal circuit and the (K167) Sensor No. 1 Return circuit in 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 (K29) APP Sensor No. 2 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. 2 voltage. Connect a jumper wire between the (F856) 5-volt Supply circuit and the (K29) APP Sensor No. 2 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) (F856) 5-VOLT SUPPLY CIRCUIT OPEN Turn the ignition off. 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 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 (F856) 5-volt Supply circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
9. 9) (F856) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND Measure the resistance between ground and the (F856) 5-volt Supply circuit in the APP Sensor harness connector. Is the resistance below 100 ohms? Yes Repair the short to ground in the (F856) 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 No. 2 voltage. Slowly press the Accelerator pedal down. Does voltage start at approximately 0.22 of a volt and go above 2.31 volts with a smooth transition? Yes Refer to «INTERMITTENT CONDITION»(ref-288287-S02739760862008062000000) Diagnostic Procedure. No 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) .

1. When Monitored: With the ignition on and no other APPS No. 2 DTCs present.

1. Set Condition: When APP Sensor No. 2 voltage is too high. Idle is additionally forced any time the brake is applied or 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 .

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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) (K29) APP SENSOR NO. 2 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 (K29) APP Sensor No. 2 Signal circuit in the APP Sensor harness connector. Is there any voltage present? Yes Repair the short to voltage in the (K29) APP Sensor No. 2 Signal circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 3) .
3. 3) (K29) APPS NO. 2 SIGNAL CIRCUIT SHORTED TO THE (F856) 5-VOLT SUPPLY CIRCUIT Turn the ignition off. Measure the resistance between the (K29) APP Sensor No. 2 Signal circuit and the (F856) 5-volt Supply circuit in the APP Sensor harness connector. Is the resistance below 10 ohms? Yes Repair the short between the (K29) APP Sensor No. 2 Signal circuit and the (F856) 5-volt Supply circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 4) .
4. 4) (K29) APPS NO. 2 SIGNAL CIRCUIT SHORTED TO THE (F855) 5-VOLT SUPPLY CIRCUIT Measure the resistance between the (K29) APP Sensor No. 2 Signal circuit and the (F855) 5-volt Supply circuit in the APP Sensor harness connector. Is the resistance below 10 ohms? Yes Repair the short between the (K29) APP Sensor No. 2 Signal circuit and the (F855) 5-volt Supply circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 5) .
5. 5) (K400) APP SENSOR NO. 2 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 (K400) APP Sensor No. 2 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 (K400) APP Sensor No. 2 Return circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
6. 6) ACCELERATOR PEDAL POSITION SENSOR Connect the PCM harness connector. 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. 2 SWEEP Ignition on, engine not running. With a scan tool, monitor the APP Sensor 2 voltage. Slowly press the Accelerator Pedal down. Does voltage start at approximately 0.22 of a volt and go above 2.31 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) .

Scheme 580

1. When Monitored: With the ignition on and no other DTCs present for TP Sensor No. 1 or No. 2.

1. Set Condition: PCM recognizes TP Sensors No. 1 and No. 2 are not coherent. 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 .

1. When Monitored: With the ignition on and no APPS No. 1 and APPS No. 2 DTC present.

1. Set Condition: APPS values No. 1 and No. 2 are not coherent. Idle is additionally forced when the brake pedal is pressed or 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 .

1. When Monitored: Ignition on.

1. Set Condition: PCM recognizes Vehicle speed input No. 2 erratic or high. VSS No. 2 is based on the average of the Front Wheel Speeds. One trip fault and the code will set within 5 seconds. No MIL and No ETC light. Cruise is disabled.

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.

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

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.

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

1. When Monitored: Ignition on and engine running with no MAP Sensor DTCs.

1. Set Condition: A large vacuum leak has been detected or both of the TP Sensors have failed based on their position being 2.5 volts and the calculated MAP value is less than the actual MAP minus an Offset value. One trip fault and the code will set within 5 seconds. ETC light will flash.

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

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1. 1) ACTIVE DTC NOTE: The most likely cause of this DTC is a vacuum leak. NOTE: Diagnose any 5-Volt Supply, TP Sensor, Fuel System Lean or Rich, or MAP Sensor DTCs before continuing. NOTE: The throttle plate should be free from binding and carbon build up. 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 limit the maximum engine speed if a large crack occurs. NOTE: A large vacuum leak is most likely the cause of this DTC. Inspect the Intake Manifold and Throttle body for leaks and cracks. Inspect the Power Brake Booster for any vacuum leaks. Inspect the PCV system for proper operation or any vacuum leaks. Inspect the MAP Sensor for proper installation. 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 Accelerator pedal. 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 13) .
4. 4) TP SENSOR OPERATION Ignition on, engine not running. With a scan tool, perform the ETC Throttle Follower Test. TP Sensor No. 1 should start at approximately 0.8 of a volt and increase to 4.2 volts. TP Sensor No. 2 should start at approximately 4.2 volts and decrease to 0.8 of a volt. Is the voltage transition smooth between the appropriate values? Yes Refer to «INTERMITTENT CONDITION»(ref-288287-S02739760862008062000000) Diagnostic Procedure. No Go to 5) .
5. 5) RESISTANCE IN THE (F855) 5-VOLT SUPPLY CIRCUIT 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 (F855) 5-volt Supply circuit from the Throttle Body harness connector to the appropriate terminal of special tool #8815. Is the resistance above 100 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 at the Throttle Body harness connector. Is the resistance above 100 ohms? Yes Go to 7) . No Repair the short to ground in the (F855) 5-volt Supply circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
7. 7) TP 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 (K922) TP Sensor Return circuit in the Throttle Body harness connector. TP Sensor No. 1 voltage should start at approximately 4.8 volts and decrease to 0.2 of a volt. Connect a jumper wire between the (K122) TP Sensor No. 2 Signal circuit and the (F855) 5-volt Supply circuit in the Throttle Body harness connector. TP Sensor No. 2 voltage should start at approximately 0 volts and increase to 4.8 to 5.2 volts. Does the TP Sensor voltage change to the appropriate voltage with the jumper wire installed? Yes Disconnect the Battery before replacing the Throttle Body Assembly. Replace 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 8) .
8. 8) RESISTANCE IN THE (K22) TP SENSOR NO. 1 SIGNAL CIRCUIT Turn the ignition off. Disconnect the C2 PCM harness connector. Measure the resistance of the (K22) TP Sensor No. 1 Signal circuit from the Throttle Body harness connector to the appropriate terminals 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) RESISTANCE IN THE (K122) TP SENSOR NO. 2 SIGNAL CIRCUIT Measure the resistance of the (K122) TP Sensor No. 2 Signal circuit from the Throttle Body harness connector to the appropriate terminals of special tool #8815. Is the resistance below 5.0 ohms? Yes Go to 10) . No Repair the excessive resistance in the (K122) TP Sensor No. 2 Signal circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
10. 10) (K22) TP SENSOR NO. 1 SIGNAL CIRCUIT SHORTED TO GROUND Measure the resistance between ground and the (K22) TP Sensor No. 1 Signal circuit at the Throttle Body harness connector. Is the resistance above 100 ohms for each circuit? Yes Go to 11) . No Repair the short to ground in the (K22) TP Sensor No. 1 Signal circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
11. 11) (K122) TP SENSOR NO. 2 SIGNAL CIRCUIT SHORTED TO GROUND Measure the resistance between ground and the (K122) TP Sensor No. 2 Signal circuit at the Throttle Body harness connector. Is the resistance above 100 ohms for each circuit? Yes Go to 12) . No Repair the short to ground in the (K122) TP Sensor No. 2 Signal circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
12. 12) RESISTANCE IN THE (K922) SENSOR RETURN CIRCUIT Measure the resistance of the (K922) TP Sensor Return 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 19) . No Repair the excessive resistance in the (K922) TP Sensor Return circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
13. 13) 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 14) . No Repair the excessive resistance in the (F856) 5-volt Supply circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
14. 14) (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 15) . No Repair the short to ground in the (F856) 5-volt Supply circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
15. 15) MAP SENSOR 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 in the MAP Sensor harness connector. Cycle the ignition switch from off to on. With a scan tool, monitor the MAP Sensor voltage. Does the scan tool display MAP voltage from approximately 4.9 volts to below 0.5 volt with the jumper wire installed? Yes Replace the MAP Sensor. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 16) . NOTE: Remove the jumper wire before continuing.
16. 16) RESISTANCE IN THE (K1) MAP SIGNAL CIRCUIT Turn the ignition off. Disconnect the C2 PCM harness connector. 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 17) . No Repair the excessive resistance in the (K1) MAP Signal circuit Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
17. 17) (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 above 100k ohms? Yes Go to 18) . No Repair the short to ground in the (K1) MAP Signal circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
18. 18) RESISTANCE IN THE (K900) SENSOR GROUND CIRCUIT 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 19) . No Repair the excessive resistance in the (K900) Sensor ground circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
19. 19) 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 engine running with no MAP Sensor DTCs.

1. Set Condition: A large vacuum leak has been detected or both of the TP Sensors have failed based on their position being 2.5 volts and the calculated MAP value is less than the Gas Flow Adaptation value is too high. One trip fault the code will set within 5 seconds. ETC light will flash.

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

1. When Monitored: Ignition on and engine running with no MAP Sensor DTCs.

1. Set Condition: PCM calculated MAP value is greater than actual MAP value plus an offset value. One trip fault. Three good trips to turn of the mil. ETC light will flash.

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

1. When Monitored: Ignition on and engine running with no MAP Sensor DTCs.

1. Set Condition: PCM calculated MAP value is greater than actual MAP value plus an offset value. One trip fault and the code will set within 5 seconds. Three good trips to turn of the mil. ETC light will flash.

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

1. When Monitored: Ignition on, Engine running, and no ECT DTCs present.

1. Set Condition: PCM recognizes that the ECT Sensor has failed its self coherence test. The coolant temp should only change at a certain rate, if this rate is too slow or too fast this fault will set. Two trip fault. Three good trips to clear MIL. The MIL and ETC light will illuminate.

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. NOTE: If this code sets during extreme ambient temperatures, improper installation of a block heater could be the cause of this DTC. With a scan tool, select View DTCs. Diagnose all other ECT and Cooling System codes 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) LOW COOLANT LEVEL NOTE: If an Engine Coolant Temperature (ECT) DTC is set along with this code, diagnose the ECT DTC first. NOTE: Inspect the ECT Sensor terminals and related PCM terminals. Ensure the terminals are free from corrosion and damage. NOTE: The best way to diagnose this DTC is to allow the vehicle to sit overnight outside in order to have a totally cold soaked engine. NOTE: Extremely cold outside ambient temperatures may have caused this DTC to set. NOTE: Need to make sure that no Cooling System DTCs are set or changes that would make the warm up much slower or much faster: broken water pump can set this, addition of aftermarket auxiliary cooler can set this DTC. WARNING: Never open the cooling system when the engine is hot. The system is under pressure. Failure to follow these instructions can result in personal injury or death. Allow the engine to cool before opening the cooling system. Inspect the coolant system for proper level and condition. Is the coolant level and condition OK? Yes Go to 3) . No Inspect the vehicle for a coolant leak and add the necessary amount of coolant. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
3. 3) THERMOSTAT NOTE: This test works best if performed on a cold engine (cold soak). Ignition on, engine not running. With a scan tool, read the Eng Coolant Tmp Deg value. If the engine was allowed to sit overnight (cold soak), the temperature value should be a sensible value that is somewhere close to the ambient temperature. NOTE: If engine coolant temperature is above 82° C (180° F), allow the engine to cool until 65° C (150° F) is reached. Start the Engine. During engine warm-up monitor the Eng Coolant Tmp Deg value. The temp deg value change should be a smooth transition from start up to normal operating temp 82° C (180° F). Also monitor the actual coolant temperature with a thermometer. NOTE: As the engine warms up to operating temperature, the actual coolant temperature (thermometer reading) and the Eng Coolant Tmp Deg on the scan tool should stay relatively close to each other. Using the appropriate service information, determine the proper opening temperature of the thermostat. Did the thermostat open at the proper temperature? Yes Go to 4) . No Replace the thermostat. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
4. 4) ECT SENSOR Turn the ignition off. Disconnect the ECT Sensor harness connector. With a scan tool, read the ECT voltage. Connect a jumper between the (K2) ECT Signal circuit and the (K900) Sensor ground circuit in the ECT Sensor harness connector. Is the voltage below 1.0 volt with the jumper wired installed? Yes Verify that there is good pin to terminal contact in the ECT Sensor and Powertrain Control Module connectors. If OK, replace the ECT Sensor. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 5) .
5. 5) (K2) ECT SIGNAL CIRCUIT SHORTED TO VOLTAGE Turn the ignition off. Disconnect the C2 PCM harness connector. Ignition on, engine not running. Measure the voltage on the (K2) ECT Signal circuit in the ECT Sensor harness connector. Is there any voltage present? Yes Repair the short to voltage in the (K2) ECT Signal circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 6) .
6. 6) (K2) ECT SIGNAL CIRCUIT OPEN Turn the ignition off. 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 (K2) ECT Signal circuit from the ECT Sensor 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 (K2) ECT Signal circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
7. 7) (K900) SENSOR GROUND CIRCUIT OPEN Measure the resistance of the (K900) Sensor ground circuit from the ECT Sensor harness connector to the appropriate terminal of special tool #8815. Is the resistance below 5.0 ohms? Yes Go to 8) . No Repair the open in the (K900) Sensor ground circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
8. 8) (K2) ECT SIGNAL CIRCUIT SHORTED TO GROUND Measure the resistance between ground and the (K2) ECT Signal circuit in the ECT Sensor harness connector. Is the resistance below 100 ohms? Yes Repair the short to ground in the (K2) ECT Signal circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 9) .
9. 9) (K2) ECT SIGNAL CIRCUIT SHORTED TO THE (K900) SENSOR GROUND CIRCUIT Measure the resistance between the (K2) ECT Signal circuit and the (K900) Sensor ground circuit in the ECT Sensor harness connector. Is the resistance below 5.0 ohms? Yes Repair the short between the (K900) Sensor ground and the (K2) ECT Signal 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 ECT 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 ECT 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) .

Scheme 602

1. When Monitored: With the engine running, vehicle speed above 96 kph (60 mph), throttle open for a minimum of 120 seconds, ECT greater than 70 C (158 F), catalytic converter temperature greater than 600 C (1112 F), and downstream oxygen sensor in a rich state. During a decel fuel shutoff event, the downstream oxygen sensor should switch from rich to lean within a specific time.

1. Set Condition: The PCM monitors the downstream O2 sensor. If the PCM does not detect a rich to lean switch within a specific time during a decel fuel shutoff event, the monitor will fail. 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: With the engine running, vehicle speed above 96 kph (60 mph), throttle open for a minimum of 120 seconds, ECT greater than 70 C (158 F), catalytic converter temperature greater than 600 C (1112 F), and downstream oxygen sensor in a rich state. During a decel fuel shutoff event, the downstream oxygen sensor should switch from rich to lean within a specific time.

1. Set Condition: The PCM monitors the downstream O2 sensor. If the PCM does not detect a rich to lean switch within a specific time during a decel fuel shutoff event, the monitor will fail. 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. No Break or APPS faults present.

1. Set Condition: The PCM recognizes a brake application following the APPS showing a fixed pedal opening. Temporary or permanent. Internally the PCM will reduce throttle opening below driver demand. One trip fault and the code will be set within 5 seconds. ETC light will illuminate, the light will only stay illuminated while DTC is active.

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

1. When Monitored: Engine running and battery voltage greater than 10 volts.

1. Set Condition: If PCM detects that the secondary ignition burn time is incorrect, too short, or not present, an error is detected. 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 .

Scheme 603

Scheme 604

Scheme 605

Scheme 606

1. 1) ACTIVE DTC NOTE: Diagnose any ASD related DTCs before continuing. Start the engine. With a scan tool, select View DTCs. NOTE: It may be necessary to drive the vehicle to meet the conditions to set this DTC, try to repeat the conditions in which the fault originally set by reviewing the Freeze Frame data. Is the DTC Active at this time? Yes Go to 2) . No Refer to «INTERMITTENT CONDITION»(ref-288287-S02739760862008062000000) Diagnostic Procedure.
2. 2) (A15) ASD RELAY OUTPUT CIRCUIT Turn the ignition off. Disconnect the Coil on Plug harness connector. Ignition on, engine not running. With a scan tool, actuate the ASD Relay. Using a 12-volt test light connected to ground, probe the (A15) ASD Relay Output circuit in the Coil on Plug harness connector. Does the test light illuminate brightly? Yes Go to 3) . No Repair the open or short to ground in the (A15) ASD Relay Output circuit between the IPM and Coil harness connector. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . NOTE: Stop All Actuations.
3. 3) COIL ON PLUG RESISTANCE Turn the ignition off. NOTE: The following resistance measurement should be taken at 21° - 27° C (70°- 80° F). Measure the resistance of the Coil on Plug. 4.7L and 3.7L Primary Ignition Coil resistance is 0.6 to 0.9 of an ohm at 25° C (77° F). 5.7L (6.1L if applicable) Primary Ignition Coil resistance is 0.558 to 0.682 of an ohm at 25° C (77° F). Is the resistance within the given specification for the Ignition Coil being tested? Yes Go to 4) . No Replace the Coil on plug. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
4. 4) IGNITION COIL 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. Using a 12-volt test light connected to a 12-volt source, probe the (K86) Coil Control No. 1 circuit. Crank the engine for 5 seconds while observing the test light. What is the condition of the test light while cranking the engine? Brightly blinking. Verify that there is good pin to terminal contact in the Ignition Coil and the Powertrain Control Module connectors. If OK, replace the Coil on plug. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . ON constantly. Go to 5) . OFF constantly. Go to 6) .
5. 5) (K86) COIL CONTROL NO. 1 CIRCUIT SHORTED TO GROUND Turn the ignition off. Disconnect the C2 PCM harness connector. Measure the resistance between ground and the (K86) Coil Control No. 1 circuit in the Coil on Plug harness connector. Is the resistance below 100 ohms? Yes Repair the short to ground in the (K86) Coil Control No. 1 circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 7) .
6. 6) (K86) COIL CONTROL NO. 1 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 (K86) Coil Control No. 1 circuit from the Coil on Plug 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 (K86) Coil Control No. 1 circuit. 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 Ignition Coil 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 Ignition Coil and the 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) .

Scheme 607

1. When Monitored: Engine running and battery voltage greater than 10 volts.

1. Set Condition: If PCM detects that the secondary ignition burn time is incorrect, too short, or not present, an error is detected. 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 .

Scheme 608

1. 1) ACTIVE DTC NOTE: Diagnose any ASD related DTC's before continuing. Start the engine. With a scan tool, select View DTCs. NOTE: It may be necessary to drive the vehicle to meet the conditions to set this DTC, try to repeat the conditions in which the fault originally set by reviewing the Freeze Frame data. Is the DTC Active at this time? Yes Go to 2) . No Refer to «INTERMITTENT CONDITION»(ref-288287-S02739760862008062000000) Diagnostic Procedure.
2. 2) (A15) ASD RELAY OUTPUT CIRCUIT Turn the ignition off. Disconnect the Coil on Plug harness connector. Ignition on, engine not running. With a scan tool, actuate the ASD Relay. Using a 12-volt test light connected to ground, probe the (A15) ASD Relay Output circuit in the Coil on Plug harness connector. Does the test light illuminate brightly? Yes Go to 3) . No Repair the open or short to ground in the (A15) ASD Relay Output circuit between the IPM and Coil harness connector. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . NOTE: Stop All Actuations.
3. 3) COIL ON PLUG RESISTANCE Turn the ignition off. NOTE: The following resistance measurement should be taken at 21° - 27° C (70°- 80° F). Measure the resistance of the Coil on Plug. 4.7L and 3.7L Primary Ignition Coil resistance is 0.6 to 0.9 of an ohm at 25° C (77° F). 5.7L (6.1L if applicable) Primary Ignition Coil resistance is 0.558 to 0.682 of an ohm at 25° C (77° F). Is the resistance within the given specification for the Ignition Coil being tested? Yes Go to 4) . No Replace the Coil on plug. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
4. 4) IGNITION COIL 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. Using a 12-volt test light connected to a 12-volt source, probe the (K85) Coil Control No. 2 circuit. Crank the engine for 5 seconds while observing the test light. What is the state of the test light while cranking the engine? Brightly blinking. Verify that there is good pin to terminal contact in the Ignition Coil and the Powertrain Control Module connectors. If OK, replace the Coil on plug. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . ON constantly. Go to 5) . OFF constantly. Go to 6) .
5. 5) (K85) COIL CONTROL NO. 2 CIRCUIT SHORTED TO GROUND Turn the ignition off. Disconnect the C2 PCM harness connector. Measure the resistance between ground and the (K85) Coil Control No. 2 circuit in the Coil on Plug harness connector. Is the resistance below 100 ohms? Yes Repair the short to ground in the (K85) Coil Control No. 2 circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 7) .
6. 6) (K85) COIL CONTROL NO. 2 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 (K85) Coil Control No. 2 circuit from the Coil on Plug 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 (K85) Coil Control No. 2 circuit. 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 Ignition Coil 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 Ignition Coil and the 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) .

Scheme 609

1. When Monitored: Engine running and battery voltage greater than 10 volts.

1. Set Condition: If PCM detects that the secondary ignition burn time is incorrect, too short, or not present, an error is detected. 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 .

Scheme 610

1. 1) ACTIVE DTC NOTE: Diagnose any ASD related DTC's before continuing. Start the engine. With a scan tool, select View DTCs. NOTE: It may be necessary to drive the vehicle to meet the conditions to set this DTC, try to repeat the conditions in which the fault originally set by reviewing the Freeze Frame data. Is the DTC Active at this time? Yes Go to 2) . No Refer to «INTERMITTENT CONDITION»(ref-288287-S02739760862008062000000) Diagnostic Procedure.
2. 2) (A15) ASD RELAY OUTPUT CIRCUIT Turn the ignition off. Disconnect the Coil on Plug harness connector. Ignition on, engine not running. With a scan tool, actuate the ASD Relay. Using a 12-volt test light connected to ground, probe the (A15) ASD Relay Output circuit in the Coil on Plug harness connector. Does the test light illuminate brightly? Yes Go to 3) . No Repair the open or short to ground in the (A15) ASD Relay Output circuit between the IPM and Coil harness connector. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . NOTE: Stop All Actuations.
3. 3) COIL ON PLUG RESISTANCE Turn the ignition off. NOTE: The following resistance measurement should be taken at 21° - 27° C (70°- 80° F). Measure the resistance of the Coil on Plug. 4.7L and 3.7L Primary Ignition Coil resistance is 0.6 to 0.9 of an ohm at 25° C (77° F). 5.7L (6.1L if applicable) Primary Ignition Coil resistance is 0.558 to 0.682 of an ohm at 25° C (77° F). Is the resistance within the given specification for the Ignition Coil being tested? Yes Go to 4) . No Replace the Coil on plug. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
4. 4) IGNITION COIL 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. Using a 12-volt test light connected to a 12-volt source, probe the (K93) Coil Control No. 3 circuit. Crank the engine for 5 seconds while observing the test light. What is the state of the test light while cranking the engine? Brightly blinking. Verify that there is good pin to terminal contact in the Ignition Coil and the Powertrain Control Module connectors. If OK, replace the Coil on plug. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . ON constantly. Go to 5) . OFF constantly. Go to 6) .
5. 5) (K93) COIL CONTROL NO. 3 CIRCUIT SHORTED TO GROUND Turn the ignition off. Disconnect the C2 PCM harness connector. Measure the resistance between ground and the (K93) Coil Control No. 3 circuit in the Coil on Plug harness connector. Is the resistance below 100 ohms? Yes Repair the short to ground in the (K93) Coil Control No. 3 circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 7) .
6. 6) (K93) COIL CONTROL NO. 3 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 (K93) Coil Control No. 3 circuit from the Coil on Plug 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 (K93) Coil Control No. 3 circuit. 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 Ignition Coil 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 Ignition Coil and the 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) .

Scheme 611

1. When Monitored: Engine running and battery voltage greater than 10 volts.

1. Set Condition: If PCM detects that the secondary ignition burn time is incorrect, too short, or not present, an error is detected. 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 .

Scheme 612

1. 1) ACTIVE DTC NOTE: Diagnose any ASD related DTC's before continuing. Start the engine. With a scan tool, select View DTCs. NOTE: It may be necessary to drive the vehicle to meet the conditions to set this DTC, try to repeat the conditions in which the fault originally set by reviewing the Freeze Frame data. Is the DTC Active at this time? Yes Go to 2) . No Refer to «INTERMITTENT CONDITION»(ref-288287-S02739760862008062000000) Diagnostic Procedure.
2. 2) (A15) ASD RELAY OUTPUT CIRCUIT Turn the ignition off. Disconnect the Coil on Plug harness connector. Ignition on, engine not running. With a scan tool, actuate the ASD Relay. Using a 12-volt test light connected to ground, probe the (A15) ASD Relay Output circuit in the Coil on Plug harness connector. Does the test light illuminate brightly? Yes Go to 3) . No Repair the open or short to ground in the (A15) ASD Relay Output circuit between the IPM and Coil harness connector. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . NOTE: Stop All Actuations.
3. 3) COIL ON PLUG RESISTANCE Turn the ignition off. NOTE: The following resistance measurement should be taken at 21° - 27° C (70°- 80° F). Measure the resistance of the Coil on Plug. 4.7L and 3.7L Primary Ignition Coil resistance is 0.6 to 0.9 of an ohm at 25° C (77° F). 5.7L (6.1L if applicable) Primary Ignition Coil resistance is 0.558 to 0.682 of an ohm at 25° C (77° F). Is the resistance within the given specification for the Ignition Coil being tested? Yes Go to 4) . No Replace the Coil on plug. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
4. 4) IGNITION COIL 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. Using a 12-volt test light connected to a 12-volt source, probe the (K15) Coil Control No. 4 circuit. Crank the engine for 5 seconds while observing the test light. What is the state of the test light while cranking the engine? Brightly blinking. Verify that there is good pin to terminal contact in the Ignition Coil and the Powertrain Control Module connectors. If OK, replace the Coil on plug. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . ON constantly. Go to 5) . OFF constantly. Go to 6) .
5. 5) (K15) COIL CONTROL NO. 4 CIRCUIT SHORTED TO GROUND Turn the ignition off. Disconnect the C2 PCM harness connector. Measure the resistance between ground and the (K15) Coil Control No. 4 circuit in the Coil on Plug harness connector. Is the resistance below 100 ohms? Yes Repair the short to ground in the (K15) Coil Control No. 4 circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 7) .
6. 6) (K15) COIL CONTROL NO. 4 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 (K15) Coil Control No. 4 circuit from the Coil on Plug 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 (K15) Coil Control No. 4 circuit. 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 Ignition Coil 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 Ignition Coil and the 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) .

Scheme 613

1. When Monitored: Engine running and battery voltage greater than 10 volts.

1. Set Condition: If PCM detects that the secondary ignition burn time is incorrect, too short, or not present, an error is detected. 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 .

Scheme 614

1. 1) ACTIVE DTC NOTE: Diagnose any ASD related DTC's before continuing. Start the engine. With a scan tool, select View DTCs. NOTE: It may be necessary to drive the vehicle to meet the conditions to set this DTC, try to repeat the conditions in which the fault originally set by reviewing the Freeze Frame data. Is the DTC Active at this time? Yes Go to 2) . No Refer to «INTERMITTENT CONDITION»(ref-288287-S02739760862008062000000) Diagnostic Procedure.
2. 2) (A15) ASD RELAY OUTPUT CIRCUIT Turn the ignition off. Disconnect the Coil on Plug harness connector. Ignition on, engine not running. With a scan tool, actuate the ASD Relay. Using a 12-volt test light connected to ground, probe the (A15) ASD Relay Output circuit in the Coil on Plug harness connector. Does the test light illuminate brightly? Yes Go to 3) . No Repair the open or short to ground in the (A15) ASD Relay Output circuit between the IPM and Coil harness connector. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . NOTE: Stop All Actuations.
3. 3) COIL ON PLUG RESISTANCE Turn the ignition off. NOTE: The following resistance measurement should be taken at 21° - 27° C (70°- 80° F). Measure the resistance of the Coil on Plug. 4.7L and 3.7L Primary Ignition Coil resistance is 0.6 to 0.9 of an ohm at 25° C (77° F). 5.7L (6.1L if applicable) Primary Ignition Coil resistance is 0.558 to 0.682 of an ohm at 25° C (77° F). Is the resistance within the given specification for the Ignition Coil being tested? Yes Go to 4) . No Replace the Coil on plug. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
4. 4) IGNITION COIL 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. Using a 12-volt test light connected to a 12-volt source, probe the (K16) Coil Control No. 5 circuit. Crank the engine for 5 seconds while observing the test light. What is the state of the test light while cranking the engine? Brightly blinking. Verify that there is good pin to terminal contact in the Ignition Coil and the Powertrain Control Module connectors. If OK, replace the Coil on plug. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . ON constantly. Go to 5) . OFF constantly. Go to 6) .
5. 5) (K16) COIL CONTROL NO. 5 CIRCUIT SHORTED TO GROUND Turn the ignition off. Disconnect the C2 PCM harness connector. Measure the resistance between ground and the (K16) Coil Control No. 5 circuit in the Coil on Plug harness connector. Is the resistance below 100 ohms? Yes Repair the short to ground in the (K16) Coil Control No. 5 circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 7) .
6. 6) (K16) COIL CONTROL NO. 5 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 (K16) Coil Control No. 5 circuit from the Coil on Plug 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 (K16) Coil Control No. 5 circuit. 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 Ignition Coil 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 Ignition Coil and the 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) .

Scheme 615

1. When Monitored: Engine running and battery voltage greater than 10 volts.

1. Set Condition: If PCM detects that the secondary ignition burn time is incorrect, too short, or not present, an error is detected. 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 .

Scheme 616

1. 1) ACTIVE DTC NOTE: Diagnose any ASD related DTC's before continuing. Start the engine. With a scan tool, select View DTCs. NOTE: It may be necessary to drive the vehicle to meet the conditions to set this DTC, try to repeat the conditions in which the fault originally set by reviewing the Freeze Frame data. Is the DTC Active at this time? Yes Go to 2) . No Refer to «INTERMITTENT CONDITION»(ref-288287-S02739760862008062000000) Diagnostic Procedure.
2. 2) (A15) ASD RELAY OUTPUT CIRCUIT Turn the ignition off. Disconnect the Coil on Plug harness connector. Ignition on, engine not running. With a scan tool, actuate the ASD Relay. Using a 12-volt test light connected to ground, probe the (A15) ASD Relay Output circuit in the Coil on Plug harness connector. Does the test light illuminate brightly? Yes Go to 3) . No Repair the open or short to ground in the (A15) ASD Relay Output circuit between the IPM and Coil harness connector. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . NOTE: Stop All Actuations.
3. 3) COIL ON PLUG RESISTANCE Turn the ignition off. NOTE: The following resistance measurement should be taken at 21° - 27° C (70°- 80° F). Measure the resistance of the Coil on Plug. 4.7L and 3.7L Primary Ignition Coil resistance is 0.6 to 0.9 of an ohm at 25° C (77° F). 5.7L (6.1L if applicable) Primary Ignition Coil resistance is 0.558 to 0.682 of an ohm at 25° C (77° F). Is the resistance within the given specification for the Ignition Coil being tested? Yes Go to 4) . No Replace the Coil on plug. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
4. 4) IGNITION COIL 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. Using a 12-volt test light connected to a 12-volt source, probe the (K10) Coil Control No. 6 circuit. Crank the engine for 5 seconds while observing the test light. What is the state of the test light while cranking the engine? Brightly blinking. Verify that there is good pin to terminal contact in the Ignition Coil and the Powertrain Control Module connectors. If OK, replace the Coil on plug. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . ON constantly. Go to 5) . OFF constantly. Go to 6) .
5. 5) (K10) COIL CONTROL NO. 6 CIRCUIT SHORTED TO GROUND Turn the ignition off. Disconnect the C2 PCM harness connector. Measure the resistance between ground and the (K10) Coil Control No. 6 circuit in the Coil on Plug harness connector. Is the resistance below 100 ohms? Yes Repair the short to ground in the (K10) Coil Control No. 6 circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 7) .
6. 6) (K10) COIL CONTROL NO. 6 CIRCUIT OPEN Turn the ignition off. Disconnect the C2 PCM harness connectors. 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 (K10) Coil Control No. 6 circuit from the Coil on Plug 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 (K10) Coil Control No. 6 circuit. 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 Ignition Coil 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 Ignition Coil and the 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) .

Scheme 617

1. When Monitored: Engine running and battery voltage greater than 10 volts.

1. Set Condition: If PCM detects that the secondary ignition burn time is incorrect, too short, or not present, an error is detected. 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 .

Scheme 618

1. 1) ACTIVE DTC NOTE: Diagnose any ASD related DTC's before continuing. Start the engine. With a scan tool, select View DTCs. NOTE: It may be necessary to drive the vehicle to meet the conditions to set this DTC, try to repeat the conditions in which the fault originally set by reviewing the Freeze Frame data. Is the DTC Active at this time? Yes Go to 2) . No Refer to «INTERMITTENT CONDITION»(ref-288287-S02739760862008062000000) Diagnostic Procedure.
2. 2) (A15) ASD RELAY OUTPUT CIRCUIT Turn the ignition off. Disconnect the Coil on Plug harness connector. Ignition on, engine not running. With a scan tool, actuate the ASD Relay. Using a 12-volt test light connected to ground, probe the (A15) ASD Relay Output circuit in the Coil on Plug harness connector. Does the test light illuminate brightly? Yes Go to 3) . No Repair the open or short to ground in the (A15) ASD Relay Output circuit between the IPM and Coil harness connector. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . NOTE: Stop All Actuations.
3. 3) COIL ON PLUG RESISTANCE Turn the ignition off. NOTE: The following resistance measurement should be taken at 21° - 27° C (70°- 80° F). Measure the resistance of the Coil on Plug. 4.7L Primary Ignition Coil resistance is 0.6 to 0.9 of an ohm at 25° C (77° F). 5.7L (6.1L if applicable) Primary Ignition Coil resistance is 0.558 to 0.682 of an ohm at 25° C (77° F). Is the resistance within the given specification for the Ignition Coil being tested? Yes Go to 4) . No Replace the Coil on plug. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
4. 4) IGNITION COIL 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. Using a 12-volt test light connected to a 12-volt source, probe the (K97) Coil Control No. 7 circuit. Crank the engine for 5 seconds while observing the test light. What is the state of the test light while cranking the engine? Brightly blinking. Verify that there is good pin to terminal contact in the Ignition Coil and the Powertrain Control Module connectors. If OK, replace the Coil on plug. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . ON constantly. Go to 5) . OFF constantly. Go to 6) .
5. 5) (K97) COIL CONTROL NO. 7 CIRCUIT SHORTED TO GROUND Turn the ignition off. Disconnect the C1 PCM harness connector. Measure the resistance between ground and the (K97) Coil Control No. 7 circuit in the Coil on Plug harness connector. Is the resistance below 100 ohms? Yes Repair the short to ground in the (K97) Coil Control No. 7 circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 7) .
6. 6) (K97) COIL CONTROL NO. 7 CIRCUIT OPEN Turn the ignition off. 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 (K97) Coil Control No. 7 circuit from the Coil on Plug 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 (K97) Coil Control No. 7 circuit. 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 Ignition Coil 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 Ignition Coil and the 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) .

Scheme 619

1. When Monitored: Engine running and battery voltage greater than 10 volts.

1. Set Condition: If PCM detects that the secondary ignition burn time is incorrect, too short, or not present, an error is detected. 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 .

Scheme 620

1. 1) ACTIVE DTC NOTE: Diagnose any ASD related DTC's before continuing. Start the engine. With a scan tool, select View DTCs. NOTE: It may be necessary to drive the vehicle to meet the conditions to set this DTC, try to repeat the conditions in which the fault originally set by reviewing the Freeze Frame data. Is the DTC Active at this time? Yes Go to 2) . No Refer to «INTERMITTENT CONDITION»(ref-288287-S02739760862008062000000) Diagnostic Procedure.
2. 2) (A15) ASD RELAY OUTPUT CIRCUIT Turn the ignition off. Disconnect the Coil on Plug harness connector. Ignition on, engine not running. With a scan tool, actuate the ASD Relay. Using a 12-volt test light connected to ground, probe the (A15) ASD Relay Output circuit in the Coil on Plug harness connector. Does the test light illuminate brightly? Yes Go to 3) . No Repair the open or short to ground in the (A15) ASD Relay Output circuit between the IPM and Coil harness connector. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . NOTE: Stop All Actuations.
3. 3) COIL ON PLUG RESISTANCE Turn the ignition off. NOTE: The following resistance measurement should be taken at 21° - 27° C (70°- 80° F). Measure the resistance of the Coil on Plug. 4.7L Primary Ignition Coil resistance is 0.6 to 0.9 of an ohm at 25° C (77° F). 5.7L (6.1L if applicable) Primary Ignition Coil resistance is 0.558 to 0.682 of an ohm at 25° C (77° F). Is the resistance within the given specification for the Ignition Coil being tested? Yes Go to 4) . No Replace the Coil on plug. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
4. 4) IGNITION COIL 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. Using a 12-volt test light connected to a 12-volt source, probe the (K98) Coil Control No. 8 circuit. Crank the engine for 5 seconds while observing the test light. What is the state of the test light while cranking the engine? Brightly blinking. Verify that there is good pin to terminal contact in the Ignition Coil and the Powertrain Control Module connectors. If OK, replace the Coil on plug. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . ON constantly. Go to 5) . OFF constantly. Go to 6) .
5. 5) (K98) COIL CONTROL NO. 8 CIRCUIT SHORTED TO GROUND Turn the ignition off. Disconnect the C1 PCM harness connector. Measure the resistance between ground and the (K98) Coil Control No. 8 circuit in the Coil on Plug harness connector. Is the resistance below 100 ohms? Yes Repair the short to ground in the (K98) Coil Control No. 8 circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 7) .
6. 6) (K98) COIL CONTROL NO. 8 CIRCUIT OPEN Turn the ignition off. 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 (K98) Coil Control No. 8 circuit from the Coil on Plug 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 (K98) Coil Control No. 8 circuit. 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 Ignition Coil 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 Ignition Coil and the 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) .

Scheme 621

1. When Monitored: The engine running. The engine RPM is high enough to assure sufficient generator current output to satisfy the electrical loads.

1. Set Condition: The battery sensed voltage is less than the target charging voltage, during engine operation, for a calibrateable amount of time. One Trip Fault. Generator light will illuminate.

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

Scheme 622

1. 1) ACTIVE DTC NOTE: Inspect the vehicle for aftermarket accessories that may exceed the Generator System output. NOTE: The battery must be fully charged. NOTE: The Generator belt tension and condition must be checked before continuing. Ignition on, engine not running. With a scan tool, select View DTCs. Read and record the related Freeze Frame data for P2503. With a scan tool, erase DTCs. Start the engine. Allow the idle to stabilize. Ignition on, engine not running. With the 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) FUSED B+ CIRCUIT HIGH RESISTANCE 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. Ignition on, engine not running. Measure the voltage between the Generator B+ Output Terminal and the Battery + Post. Start the engine. Is the voltage above 0.4 of a volt? Yes Repair the excessive resistance in the battery positive circuit between the Generator and Battery. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 3) .
3. 3) GENERATOR OPERATION Turn the ignition off. Disconnect the Generator Field harness connector. Using a 12-volt test light connected to ground, probe (K125) Generator Field Control circuit in the Generator Field harness connector. NOTE: The DTC needs to be cleared before actuating the Solenoid, if the DTC is not cleared, the Solenoid may not be allowed to actuate. Ignition on, engine not running. With a scan tool, actuate the Generator Field Driver. NOTE: The test light should be illuminated and bright proportional to the maximum duty cycle allowed by the scan tool. For example, if the scan tool allows 100% actuation, the brightness should be as bright as a direct connection to the battery. If the scan tool allows a maximum 25% actuation, the brightness should be 25% as bright as a direct connection to the battery. Does the test light illuminate accordingly? Yes Verify that there is good pin to terminal contact in the Generator and the Powertrain Control Module connectors. If OK, replace the Generator. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 4) .
4. 4) POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Generator 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 Generator and the 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) .

1. When Monitored: The engine running. The engine speed greater than 1157 RPM.

1. Set Condition: The alternator B+ voltage sense circuit voltage reading exceeds the direct Battery B+ sense circuit. The Generator Output terminal is not connected to the Battery B+ post. One trip fault.

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 greater than 10° C (50° F), after a minimum temperature drop of 10° C (50° F) during ignition off, and battery voltage greater than 10 volts.

1. Set Condition: The PCM detects that the engine coolant temperature drops a specified amount during the measured engine off time. 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 .

Scheme 623

1. 1) ACTIVE DTC NOTE: Diagnose and repair any other DTCs set in the PCM before proceeding with this test. Turn the ignition on. With the scan tool, Clear DTCs in the Powertrain Control Module (PCM). Start the engine and allow it to reach 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. With the 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) PCM IGNITION CIRCUITS Turn the ignition off. 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. With a 12-volt test light connected to ground and with special tool #8815 installed, probe the (F1), (F26), and (F942) Fused Ignition Switch circuits. Perform the above check with the Ignition key in the off lock position, Ignition on, engine not running position, and during cranking. Wiggle the related wire harness while probing the special tool with the test light to try to interrupt the circuit. Does the test light illuminate brightly? Yes Go to 3) . No Repair the open or excessive resistance in the (F1), (F26), and (F942) Fused Ignition Switch (Off, Run, Start) circuits. Inspect the related fuse, if the fuse is open check the circuits for a short to ground. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
3. 3) POWERTRAIN CONTROL MODULE (PCM) Verify that the PCM is operating at the latest software version available. Refer to any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Replace and program the Powertrain Control Module (PCM) in accordance with the Service Information. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .