Dtcs P0203 to P0406: Other Dodge Nitro I

Monitor Conditions

1. When Monitored: With battery voltage greater than 10 volts. Auto Shutdown Relay energized. Engine speed less than 3000 RPM.

Set Conditions

1. Set Condition: The PCM monitors the continuity of the injector circuits as well as the voltage spike created by the collapse of the magnetic field in the injector coil. Any condition that reduces the maximum current flow or the magnitude of the voltage spike can cause this DTC to set.

Possible Causes

Always perform the PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE before proceeding.

Scheme 114

Scheme 115

Scheme 116

Scheme 117

1. ACTIVE DTC Turn the ignition on. With the scan tool, select View DTCs. Record DTC and Freeze Frame information. 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. NOTE: Review Freeze Frame information. Operate the vehicle under conditions similar to which the DTC was set. With a scan tool, select View DTCs. Is the DTC Active at this time? Yes Go To 2 . No Refer to the «INTERMITTENT CONDITION»(ref-306207-S19641665412008120900000) Diagnostic Procedure.
2. FUEL INJECTOR 3 CIRCUIT RESISTANCE Turn the ignition off. Disconnect the C2 PCM harness connector. Remove the ASD Relay. NOTE: The resistance of the circuit will vary according to the temperature of the injector coil. Use the table below to determine the resistance range of the injector. 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 Fuel Injector 3 circuit from the appropriate terminal of special tool #8815 and the ASD Relay connector. Fuel Injector Coil Resistance Based on Engine Temperature Temperature Resistance -20° C (-4° F) 10 ohms (+/-.6 of an ohm) 20° C (68° F) 12 ohms (+/-.6 of an ohm) 60° C (140° F) 14 ohms (+/-.6 of an ohm) 100° C (212° F) 16 ohms (+/-.6 of an ohm) Is the resistance of the injector within the specified range? Yes Go To 7 . No Go To 3 .
3. FUEL INJECTOR 3 WIRING AND CONNECTOR INSPECTION Turn the ignition off. Verify that the Fuel Injector 3 is properly connected to the injector. Disconnect the Fuel Injector 3 connector and Inspect the terminals for any condition that would result in a poor connection. Using the wiring diagram/schematic as a guide, inspect the Fuel Injector 3 wiring and connector. Look for any chafed, pierced, pinched, or partially broken wires. Verify that there is good pin to terminal contact in the Injector and Powertrain Control Module connectors. Look for broken, bent, pushed out or corroded terminals. Were any problems found? Yes Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 4 .
4. (F342) ASD RELAY OUTPUT CIRCUIT Connect the C2 PCM harness connector. Turn the ignition on. With the scan tool, actuate the Auto Shutdown (ASD) Relay Control State. Using a 12-volt test light connected to ground, check the (F342) ASD Relay Output circuit in the Fuel Injector 3 harness connector. NOTE: The test light should be illuminated and bright. Compare the brightness to that of a direct connection to the battery. Is the test light illuminated and bright? Yes. Go To 5 . No. Repair the excessive resistance or short to ground in the (F342) ASD Relay Output circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .
5. (K13) INJECTOR 3 CONTROL 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. Turn the ignition off. Disconnect the C2 PCM harness connector. Measure the resistance of the (K13) Injector 3 Control circuit from the Fuel Injector 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 (K13) Injector 3 Control circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .
6. FUEL INJECTOR 3 Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Fuel Injector 3 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 Injector and Powertrain Control Module connectors. Refer to any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Replace the Fuel Injector 3 in accordance with the Service Information. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .
7. (K13) INJECTOR 3 CONTROL CIRCUIT SHORTED TO GROUND Turn the ignition off. Disconnect the C2 PCM harness connector. Measure the resistance between ground and the (K13) Injector 3 Control circuit in the Injector harness connector. Is the resistance below 100 ohms? Yes Repair the short to ground in the (K13) Injector 3 Control circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 8 .
8. POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Fuel Injector 3 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 Injector and Powertrain Control Module connectors. Refer to any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Replace and program the Powertrain Control Module per Service Information. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .

Scheme 118

1. When Monitored: With battery voltage greater than 10 volts. Auto Shutdown Relay energized. Engine speed less than 3000 RPM.

1. Set Condition: The PCM monitors the continuity of the injector circuits as well as the voltage spike created by the collapse of the magnetic field in the injector coil. Any condition that reduces the maximum current flow or the magnitude of the voltage spike can cause this DTC to set.

Always perform the PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE before proceeding.

Scheme 119

Scheme 120

1. ACTIVE DTC Turn the ignition on. With the scan tool, select View DTCs. Record DTC and Freeze Frame information. 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. NOTE: Review Freeze Frame information. Operate the vehicle under conditions similar to which the DTC was set. With a scan tool, select View DTCs. Is the DTC Active at this time? Yes Go To 2 . No Refer to the «INTERMITTENT CONDITION»(ref-306207-S19641665412008120900000) Diagnostic Procedure.
2. FUEL INJECTOR 4 CIRCUIT RESISTANCE Turn the ignition off. Disconnect the C2 PCM harness connector. Remove the ASD Relay. NOTE: The resistance of the circuit will vary according to the temperature of the injector coil. Use the table below to determine the resistance range of the injector. 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 Fuel Injector 4 circuit from the appropriate terminal of special tool #8815 and the ASD Relay connector. Fuel Injector Coil Resistance Based on Engine Temperature Temperature Resistance -20° C (-4° F) 10 ohms (+/-.6 of an ohm) 20° C (68° F) 12 ohms (+/-.6 of an ohm) 60° C (140° F) 14 ohms (+/-.6 of an ohm) 100° C (212° F) 16 ohms (+/-.6 of an ohm) Is the resistance of the injector within the specified range? Yes Go To 7 . No Go To 3 .
3. FUEL INJECTOR 4 WIRING AND CONNECTOR INSPECTION Turn the ignition off. Verify that the Fuel Injector 4 is properly connected to the injector. Disconnect the Fuel Injector 4 connector and Inspect the terminals for any condition that would result in a poor connection. Using the wiring diagram/schematic as a guide, inspect the Fuel Injector 4 wiring and connector. Look for any chafed, pierced, pinched, or partially broken wires. Verify that there is good pin to terminal contact in the Injector and Powertrain Control Module connectors. Look for broken, bent, pushed out or corroded terminals. Were any problems found? Yes Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 4 .
4. (F342) ASD RELAY OUTPUT CIRCUIT Connect the C2 PCM harness connector. Turn the ignition on. With the scan tool, actuate the Auto Shutdown (ASD) Relay Control State. Using a 12-volt test light connected to ground, check the (F342) ASD Relay Output circuit in the Fuel Injector 4 harness connector. NOTE: The test light should be illuminated and bright. Compare the brightness to that of a direct connection to the battery. Is the test light illuminated and bright? Yes. Go To 5 . No. Repair the excessive resistance or short to ground in the (F342) ASD Relay Output circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .
5. (K14) INJECTOR 4 CONTROL 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. Turn the Ignition off. Disconnect the C2 PCM harness connector. Measure the resistance of the (K14) Injector 4 Control circuit from the Fuel Injector 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 (K14) Injector 4 Control circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .
6. FUEL INJECTOR 4 Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Fuel Injector 4 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 Injector and Powertrain Control Module connectors. Refer to any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Replace the Fuel Injector 4 in accordance with the Service Information. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .
7. (K14) INJECTOR 4 CONTROL CIRCUIT SHORTED TO GROUND Turn the ignition off. Disconnect the C2 PCM harness connector. Measure the resistance between ground and the (K14) Injector 4 Control circuit in the Injector harness connector. Is the resistance below 100 ohms? Yes Repair the short to ground in the (K14) Injector 4 Control circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 8 .
8. POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Fuel Injector 4 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 Injector and Powertrain Control Module connectors. Refer to any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Replace and program the Powertrain Control Module per Service Information. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .

Scheme 121

1. When Monitored: With battery voltage greater than 10 volts. Auto Shutdown Relay energized. Engine speed less than 3000 RPM.

1. Set Condition: The PCM monitors the continuity of the injector circuits as well as the voltage spike created by the collapse of the magnetic field in the injector coil. Any condition that reduces the maximum current flow or the magnitude of the voltage spike can cause this DTC to set.

Always perform the PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE before proceeding.

Scheme 122

Scheme 123

1. ACTIVE DTC Turn the ignition on. With the scan tool, select View DTCs. Record DTC and Freeze Frame information. 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. NOTE: Review Freeze Frame information. Operate the vehicle under conditions similar to which the DTC was set. With a scan tool, select View DTCs. Is the DTC Active at this time? Yes Go To 2 . No Refer to the «INTERMITTENT CONDITION»(ref-306207-S19641665412008120900000) Diagnostic Procedure.
2. FUEL INJECTOR 5 CIRCUIT RESISTANCE Turn the ignition off. Disconnect the C2 PCM harness connector. Remove the ASD Relay. NOTE: The resistance of the circuit will vary according to the temperature of the injector coil. Use the table below to determine the resistance range of the injector. 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 Fuel Injector 5 circuit from the appropriate terminal of special tool #8815 and the ASD Relay connector. Fuel Injector Coil Resistance Based on Engine Temperature Temperature Resistance -20° C (-4° F) 10 ohms (+/-.6 of an ohm) 20° C (68° F) 12 ohms (+/-.6 of an ohm) 60° C (140° F) 14 ohms (+/-.6 of an ohm) 100° C (212° F) 16 ohms (+/-.6 of an ohm) Is the resistance of the injector within the specified range? Yes Go To 7 . No Go To 3 .
3. FUEL INJECTOR 5 WIRING AND CONNECTOR INSPECTION Turn the ignition off. Verify that the Fuel Injector 5 is properly connected to the injector. Disconnect the Fuel Injector 5 connector and Inspect the terminals for any condition that would result in a poor connection. Using the wiring diagram/schematic as a guide, inspect the Fuel Injector 5 wiring and connector. Look for any chafed, pierced, pinched, or partially broken wires. Verify that there is good pin to terminal contact in the Injector and Powertrain Control Module connectors. Look for broken, bent, pushed out or corroded terminals. Were any problems found? Yes Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 4 .
4. (F342) ASD RELAY OUTPUT CIRCUIT Connect the C2 PCM harness connector. Turn the ignition on. With the scan tool, actuate the Auto Shutdown (ASD) Relay Control State. Using a 12-volt test light connected to ground, check the (F342) ASD Relay Output circuit in the Fuel Injector 5 harness connector. NOTE: The test light should be illuminated and bright. Compare the brightness to that of a direct connection to the battery. Is the test light illuminated and bright? Yes. Go To 5 . No. Repair the excessive resistance or short to ground in the (F342) ASD Relay Output circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .
5. (K38) INJECTOR 5 CONTROL 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. Turn the ignition off. Disconnect the C2 PCM harness connector. Measure the resistance of the (K38) Injector 5 Control circuit from the Fuel Injector 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 (K38) Injector 5 Control circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .
6. FUEL INJECTOR 5 Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Fuel Injector 5 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 Injector and Powertrain Control Module connectors. Refer to any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Replace the Fuel Injector 5 in accordance with the Service Information. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .
7. (K38) INJECTOR 5 CONTROL CIRCUIT SHORTED TO GROUND Turn the ignition off. Disconnect the C2 PCM harness connector. Measure the resistance between ground and the (K38) Injector 5 Control circuit in the Injector harness connector. Is the resistance below 100 ohms? Yes Repair the short to ground in the (K38) Injector 5 Control circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 8 .
8. POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Fuel Injector 5 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 Injector 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-306217-S13377649292008120900000) . No Replace and program the Powertrain Control Module per Service Information. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .

Scheme 124

1. When Monitored: With battery voltage greater than 10 volts. Auto Shutdown Relay energized. Engine speed less than 3000 RPM.

1. Set Condition: The PCM monitors the continuity of the injector circuits as well as the voltage spike created by the collapse of the magnetic field in the injector coil. Any condition that reduces the maximum current flow or the magnitude of the voltage spike can cause this DTC to set.

Always perform the PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE before proceeding.

Scheme 125

Scheme 126

1. ACTIVE DTC Turn the ignition on. With the scan tool, select View DTCs. Record DTC and Freeze Frame information. 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. NOTE: Review Freeze Frame information. Operate the vehicle under conditions similar to which the DTC was set. With a scan tool, select View DTCs. Is the DTC Active at this time? Yes Go To 2 . No Refer to the «INTERMITTENT CONDITION»(ref-306207-S19641665412008120900000) Diagnostic Procedure.
2. FUEL INJECTOR 6 CIRCUIT RESISTANCE Turn the ignition off. Disconnect the C2 PCM harness connector. Remove the ASD Relay. NOTE: The resistance of the circuit will vary according to the temperature of the injector coil. Use the table below to determine the resistance range of the injector. 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 Fuel Injector 6 circuit from the appropriate terminal of special tool #8815 and the ASD Relay connector. Fuel Injector Coil Resistance Based on Engine Temperature Temperature Resistance -20° C (-4° F) 10 ohms (+/-.6 of an ohm) 20° C (68° F) 12 ohms (+/-.6 of an ohm) 60° C (140° F) 14 ohms (+/-.6 of an ohm) 100° C (212° F) 16 ohms (+/-.6 of an ohm) Is the resistance of the injector within the specified range? Yes Go To 7 . No Go To 3 .
3. FUEL INJECTOR 6 WIRING AND CONNECTOR INSPECTION Turn the ignition off. Verify that the Fuel Injector 6 is properly connected to the injector. Disconnect the Fuel Injector 6 connector and Inspect the terminals for any condition that would result in a poor connection. Using the wiring diagram/schematic as a guide, inspect the Fuel Injector 6 wiring and connector. Look for any chafed, pierced, pinched, or partially broken wires. Verify that there is good pin to terminal contact in the Injector and Powertrain Control Module connectors. Look for broken, bent, pushed out or corroded terminals. Were any problems found? Yes Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 4 .
4. (F342) ASD RELAY OUTPUT CIRCUIT CHECK Connect the C2 PCM harness connector. Turn the ignition on. With the scan tool, actuate the Auto Shutdown (ASD) Relay Control State. Using a 12-volt test light connected to ground, check the (F342) ASD Relay Output circuit in the Fuel Injector 6 harness connector. NOTE: The test light should be illuminated and bright. Compare the brightness to that of a direct connection to the battery. Is the test light illuminated and bright? Yes. Go To 5 . No. Repair the excessive resistance or short to ground in the (F342) ASD Relay Output circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .
5. (K58) INJECTOR 6 CONTROL 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 #8816 to perform diagnosis. Turn the ignition off. Disconnect the C2 PCM harness connector. Measure the resistance of the (K58) Injector 6 Control circuit from the Fuel Injector harness connector to the appropriate terminal of special tool #8815. Is the resistance below 6.0 ohms? Yes Go To 6 . No Repair the open in the (K58) Injector 6 Control circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .
6. FUEL INJECTOR 6 Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Fuel Injector 6 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 Injector and Powertrain Control Module connectors. Refer to any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Replace the Fuel Injector 6 in accordance with the Service Information. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .
7. (K58) INJECTOR 6 CONTROL CIRCUIT SHORTED TO GROUND Turn the ignition off. Disconnect the C2 PCM harness connector. Measure the resistance between ground and the (K58) Injector 6 Control circuit in the Injector harness connector. Is the resistance below 100 ohms? Yes Repair the short to ground in the (K58) Injector 6 Control circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 8 .
8. POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Fuel Injector 6 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 Injector 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-306217-S13377649292008120900000) . No Replace and program the Powertrain Control Module per Service Information. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .

Scheme 127

1. When Monitored: Ignition on and No MAP Sensor DTCs set.

1. Set Condition: TP Sensor signals do not correlate to the MAP Sensor signal. Two Trip Fault. ETC light will illuminate. P2135 should set with this code also.

Always perform the PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE before proceeding.

Scheme 128

Scheme 129

Scheme 130

1. ACTIVE DTC NOTE: When this DTC is Active the engine speed, torque, and vehicle speed are limited to a Limp in mode. NOTE: Diagnose any other TP Sensor DTC(s) 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. NOTE: Inspect the engine for vacuum leaks. Ignition on, engine not running. With a scan tool, select View DTCs. Is the DTC Active at this time? Yes Go To 2 . No Go To 9 .
2. EXCESSIVE RESISTANCE IN THE (K122) TP SIGNAL 2 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 along with the #8815-1 to perform the diagnosis. Using a voltmeter perform a voltage drop test. Backprobe the (K122) TP Signal 2 circuit at the Throttle Body harness connector and probe the appropriate terminal of the special tool #8815. Make sure the voltmeter leads are connected so a positive polarity is displayed on the voltmeter. 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. Start the engine and allow it to reach normal operating temperature. Monitor the voltmeter. Is the voltage below 0.5 of a volt? Yes Go To 3 . No Repair the excessive resistance in the (K122) TP Signal 2 circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .
3. EXCESSIVE RESISTANCE IN THE (K22) TP SIGNAL 1 CIRCUIT Turn the ignition off. Move the voltmeter leads to backprobe the (K22) TP Signal 1 circuit at the Throttle Body harness connector and to probe the appropriate terminal of the special tool #8815. Make sure the voltmeter leads are connected so a positive polarity is displayed on the voltmeter. 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. Start the engine and allow it to reach normal operating temperature. Monitor the voltmeter. Is the voltage below 0.5 of a volt? Yes Go To 4 . No Repair the excessive resistance in the (K22) TP Signal 1 circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .
4. EXCESSIVE RESISTANCE IN THE (K855) 5-VOLT SUPPLY CIRCUIT Turn the ignition off. Move the voltmeter leads to backprobe the (K855) 5-volt Supply circuit at the Throttle Body harness connector and to probe the appropriate terminal of the special tool #8815. Make sure the voltmeter leads are connected so a positive polarity is displayed on the voltmeter. 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. Start the engine and allow it to reach normal operating temperature. Monitor the voltmeter. Is the voltage below 0.5 of a volt? Yes Go To 5 . No Repair the excessive resistance in the (K855) 5-volt Supply circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .
5. EXCESSIVE RESISTANCE IN THE (K922) TP SENSOR GROUND CIRCUIT Turn the ignition off. Move the voltmeter leads to backprobe the (K922) TP Sensor Ground circuit at the Throttle Body harness connector and to probe the appropriate terminal of the special tool #8815. Make sure the voltmeter leads are connected so a positive polarity is displayed on the voltmeter. 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. Start the engine and allow it to reach normal operating temperature. Monitor the voltmeter. Is the voltage below 0.5 of a volt? Yes Go To 6 . No Repair the excessive resistance in the (K922) TP Sensor Ground circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .
6. (K22) TP SIGNAL 1 CIRCUIT SHORTED TO THE (K122) TP SIGNAL 2 CIRCUIT Measure the resistance between the (K22) TP Signal 1 circuit and the (K122) TP Signal 2 circuit at the Throttle Body harness connector. Is the resistance below 5.0 ohms? Yes Repair the short between the (K122) TP Signal 2 circuit and the (K22) TP Signal 1 circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 7 .
7. THROTTLE POSITION SENSOR Turn the ignition off. Connect the C2 PCM harness connector. Ignition on, engine not running. With the scan tool, monitor the TP Signal 1 and 2 voltage. Connect a jumper wire between the (K922) TP Sensor Ground circuit and the (K22) TP Signal 1 circuit. NOTE: TP Sensor 1 voltage should change from approximately 4.7 volts to 0.3 of a volt. For TP Sensor 2, connect a jumper wire between (K855) 5-volt supply circuit and the (K122) TP Signal 2 circuit. NOTE: TP Sensor 2 voltage should change from approximately 0 volts to 5.0 volts. Is the voltage reading within the listed specification with the jumper wire installed? Yes Disconnect the Battery when replacing the Throttle Body Assembly. Replace the Throttle Body Assembly. After installation is complete, using a scan tool, select the ETC RELEARN function. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 8 . NOTE: Remove the jumper wire before continuing.
8. POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Throttle Body 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 Throttle Body 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-306217-S13377649292008120900000) . No Verify that there is good pin to terminal contact in the Throttle Body and Powertrain Control Module connectors. If OK, replace the Throttle Body Assembly. Disconnect the Battery when replacing the Throttle Body Assembly. After installation is complete, using a scan tool select the ETC RELEARN function. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .
9. THROTTLE FOLLOWER TEST Ignition on, engine not running. With the scan tool, perform the ETC Throttle Follower Test and monitor the TP Sensor 1 or 2 voltage. Slowly press the throttle pedal down. The voltage for TP Sensor 1 should start at approximately 0.7 of a volt and increase to approximately 4.3 volts. The voltage for TP Sensor 2 should start at approximately 4.3 volts and decrease to approximately 0.7 of a volt. Is the voltage within the range of the listed specification for the appropriate Sensor? Yes Refer to the «INTERMITTENT CONDITION»(ref-306207-S19641665412008120900000) Diagnostic Procedure. No Verify that there is good pin to terminal contact in the Throttle Body and Powertrain Control Module connectors. If OK, replace the Throttle Body Assembly. Disconnect the Battery when replacing the Throttle Body Assembly. After installation is complete, using a scan tool select the ETC RELEARN function. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .

1. When Monitored: With the ignition on. Battery voltage greater than 10 volts.

1. Set Condition: The PCM recognizes that the TP Sensor 2 voltage is lower than the acceptable value. One Trip Fault. Three good trips to turn off the MIL. ETC light will illuminate.

Always perform the PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE before proceeding.

Scheme 131

Scheme 132

Scheme 133

Scheme 134

Scheme 135

Scheme 136

1. ACTIVE DTC NOTE: Diagnose and repair any Throttle Body circuit, system voltage, or sensor supply voltage DTCs before continuing with this test. 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. NOTE: If the DTC does not reset it may be necessary to test drive the vehicle. Is the DTC Active at this time? Yes Go To 2 . No Go To 11 .
2. P0122 ALSO SET Was the P0122-TP SENSOR NO.1 VOLTAGE LOW DTC set along with the P0222? Yes Go To 3 . No Go To 4 .
3. (K855) 5-VOLT SUPPLY CIRCUIT Turn the ignition off. Disconnect the Throttle Body harness connector. Ignition on, engine not running. Measure the voltage on the (K855) 5-volt Supply circuit in the Throttle Body harness connector. Is the voltage between 4.5 to 5.2 volts? Yes Go To 4 . No Go To 8 .
4. THROTTLE POSITION SENSOR With the scan tool, monitor the TP Sensor No.2 voltage. Connect a jumper wire between the (K855) 5-volt Supply circuit and the (K122) TP Signal 2 circuit in the Throttle Body 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 Throttle Body and Powertrain Control Module connectors. If OK, replace the Throttle Body Assembly. Disconnect the Battery when replacing the Throttle Body Assembly. After installation is complete, using a scan tool select the ETC RELEARN function. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 5 . NOTE: Remove the jumper wire before continuing.
5. (K122) TP SIGNAL 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 (K122) TP Signal 2 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 (K122) TP Signal 2 circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .
6. (K122) TP SIGNAL 2 CIRCUIT SHORTED TO GROUND Measure the resistance between ground and the (K122) TP Signal 2 circuit at the Throttle Body harness connector. Is the resistance below 100 ohms? Yes Repair the short to ground in the (K122) TP Signal 2. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 7 .
7. (K122) TP SIGNAL 2 CIRCUIT SHORTED TO THE (K922) TP SENSOR GROUND CIRCUIT Measure the resistance between the (K122) TP Signal 2 circuit and the (K922) TP Sensor Ground circuit at the Throttle Body harness connector. Is the resistance below 100 ohms? Yes Repair the short between the (K922) TP Sensor Ground circuit and the (K122) TP Signal 2 circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 10 .
8. (K855) 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 (K855) 5-volt Supply 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 (K855) 5-volt Supply circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .
9. (K855) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND Measure the resistance between ground and the (K855) 5-volt Supply circuit at the Throttle Body harness connector. Is the resistance below 100 ohms? Yes Repair the short to ground in the (K855) 5-volt Supply circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 10 .
10. POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Throttle Body 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 Throttle Body 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-306217-S13377649292008120900000) . No Replace and program the Powertrain Control Module per Service Information. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .
11. THROTTLE FOLLOWER TEST Ignition on, engine not running. With the scan tool, perform the ETC Throttle Follower Test. Monitor the TP Sensor No.2 voltage while slowly pressing the Throttle pedal down. Is there a smooth voltage change from approximately 4.3 volts and decrease to approximately 0.7 of a volt? Yes Refer to the «INTERMITTENT CONDITION»(ref-306207-S19641665412008120900000) Diagnostic Procedure. No Verify that there is good pin to terminal contact in the Throttle Body and Powertrain Control Module connectors. If OK, replace the Throttle Body Assembly. Disconnect the Battery when replacing the Throttle Body Assembly. After installation is complete, using a scan tool select the ETC RELEARN function. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .

1. When Monitored: With the ignition on.

1. Set Condition: Throttle Position Sensor No.2 Signal circuit voltage is greater than the maximum acceptable value. One Trip Fault. ETC light will illuminate.

Always perform the PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE before proceeding.

Scheme 137

Scheme 138

Scheme 139

1. ACTIVE DTC NOTE: Diagnose and repair any Throttle Body circuit, system voltage, or sensor supply voltage DTCs before continuing with this test. 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. NOTE: If the DTC does not reset it may be necessary to test drive the vehicle. Is the DTC Active at this time? Yes Go To 2 . No Go To 7 .
2. THROTTLE POSITION SENSOR Turn the ignition off. Disconnect the Throttle Body Assembly harness connector. Ignition on, engine not running. With the scan tool monitor the TP Sensor No.2 voltage. Is the voltage below 0.5 volt? Yes Verify that there is good pin to terminal contact in the Throttle Body and Powertrain Control Module connectors. If OK, replace the Throttle Body Assembly. Disconnect the Battery when replacing the Throttle Body Assembly. After installation is complete, using a scan tool select the ETC RELEARN function. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 3 .
3. (K122) TP SIGNAL 2 CIRCUIT SHORTED TO VOLTAGE Turn the ignition off. Disconnect the C2 PCM harness connector. Ignition on, engine not running. Measure the voltage on the (K122) TP Signal 2 circuit at the Throttle Body harness connector. Is there any voltage present? Yes Repair the short to voltage in the (K122) TP Signal 2 circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 4 .
4. (K122) TP SIGNAL 2 CIRCUIT SHORTED TO THE (K855) 5-VOLT SUPPLY CIRCUIT Measure the resistance between the (K122) TP Signal 2 circuit and the (K855) 5-volt Supply circuit at the Throttle Body harness connector. Is the resistance below 100 ohms? Yes Repair the short between the (K122) TP Signal 2 circuit and the (K855) 5-volt Supply circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 5 .
5. (K922) TP SENSOR GROUND 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 (K922) TP Sensor Ground 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 (K922) TP Sensor Ground circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .
6. POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Throttle Body 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 Throttle Body 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-306217-S13377649292008120900000) . No Replace and program the Powertrain Control Module per Service Information. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .
7. THROTTLE FOLLOWER TEST With the scan tool, perform the ETC Throttle Follower Test. Monitor the TP Sensor No.2 voltage while slowly pressing the Throttle pedal down. Is there a smooth voltage change from approximately 4.3 volts and decrease to approximately 0.7 of a volt? Yes Refer to the «INTERMITTENT CONDITION»(ref-306207-S19641665412008120900000) Diagnostic Procedure. No Verify that there is good pin to terminal contact in the Throttle Body and Powertrain Control Module connectors. If OK, replace the Throttle Body Assembly. Disconnect the Battery when replacing the Throttle Body Assembly. After installation is complete, using a scan tool select the ETC RELEARN function. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .

1. When Monitored: Any time the engine is running, and the adaptive numerator has been successfully updated.

1. Set Condition: The threshold to set the fault is application specific; it is tied to the level of misfire that will cause emissions to increase to 1.5 times the standard or in some cases 1%. It is always a two trip fault above the calibrated RPM. It takes 1 soft fail to set a malfunction and two trips to set the MIL. Three good trips to turn off the MIL.

Always perform the PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE before proceeding.

1. When Monitored: Any time the engine is running, and the adaptive numerator has been successfully updated.

1. Set Condition: The threshold to set the fault is application specific; it is tied to the level of misfire that will cause emissions to increase to 1.5 times the standard or in some cases 1%. It is always a two trip fault above the calibrated RPM. It takes 1 soft fail to set a malfunction and two trips to set the MIL. Three good trips to turn off the MIL.

Always perform the PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE before proceeding.

Scheme 140

Scheme 141

Scheme 142

Scheme 143

1. DTC IS ACTIVE Diagnose and repair any other active component or circuit DTCs before continuing with this procedure. Turn the ignition on. With the scan tool, select View DTCs. Copy DTC and Freeze Frame information. 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. NOTE: Attempt to operate the vehicle under conditions similar to which the DTC was set. NOTE: It may be necessary to test drive the vehicle within the DTC monitoring conditions in order for this DTC to set. With a scan tool, select View DTCs. Is the DTC Active at this time? Yes Go To 2 . No Refer to the «INTERMITTENT CONDITION»(ref-306207-S19641665412008120900000) Diagnostic Procedure.
2. VISUAL INSPECTION NOTE: Anything that affects the speed of the crankshaft can cause this DTC to set. NOTE: When a misfire is detected, the PCM will shut down the injector control circuit for the misfiring cylinder. Inspect the engine for any of the following conditions: - Worn serpentine belt - Misalignment or binding water pump, P/S pump or A/C compressor pulleys - Improper CKP, CMP, MAP, or TP Sensor mounting. - Poor connector/terminal to component connection for CKP sensor, CMP sensor, MAP sensor, TP sensor, fuel injector, ignition coil, etc. - Corroded PCM power or ground circuits. - Vacuum leaks. - Restriction in the air induction or exhaust system. - Internal engine component malfunction. NOTE: Misfire may occur and may not be caused by component failure. Any of the following conditions can cause a misfire: - Moisture on ignition system components - Insufficient fuel - Low quality fuel - Manual transmission bog - Towing overload Were any problems found? Yes Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 3 .
3. (F342), (F344) ASD RELAY OUTPUT CIRCUIT Turn the ignition off. Disconnect the Ignition Coil harness connector. Disconnect the Fuel Injector No.1 harness connector. Ignition on, engine not running. With the scan tool, actuate the ASD Relay. Using a 12-volt test light connected to ground, probe the (F342), (F344) ASD Relay Output circuit in the Ignition Coil harness connector and Fuel Injector harness connector while the ASD Relay is actuating. Does the test light illuminate brightly? Yes Go To 4 . No Repair the excessive resistance or short to ground in the (F342), (F344) ASD Relay Output circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .
4. IGNITION SYSTEM OPERATION 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. Turn the ignition off. Connect the Ignition Coil harness connector. Remove the Ignition wire/coil from the Cylinder 1 Spark Plug. Leave the Fuel Injector harness connector of the cylinder being tested disconnected. Install a spark tester on the Ignition wire. While cranking the engine observe the spark coming from the spark tester. NOTE: A crisp blue spark that is able to jump the gap of the spark tester should be generated. Is good spark present? Yes Go To 5 . No Go To 14 . NOTE: Connect the Fuel Injector harness connector before continuing.
5. SPARK PLUG Turn the ignition off. Remove the Spark Plug. Inspect the Spark Plug for the following conditions. - Cracks - Carbon Tracking - Foreign Material - Gap size out of specifications - Loose or broken electrode NOTE: Lightly tap the bottom of the spark plug on a solid surface. The electrode in the spark plug should not move. Were any of the above conditions present? Yes Replace the Spark Plug. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 6 .
6. FUEL PRESSURE CHECK WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow these instructions can result in personal injury or death. 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. Install a fuel pressure gauge to the fuel rail. Start the engine and observe the fuel pressure reading. NOTE: Fuel pressure specification is 407 kPa +/- 34 kPa (59 psi +/- 5 psi). Choose a conclusion that best matches your fuel pressure reading. Within Specification Go To 7 . Below Specification Go To 12 . Above Specification Replace the fuel filter/pressure regulator. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .
7. FUEL PRESSURE LEAK DOWN NOTE: Before continuing visually and physically inspect the fuel delivery system for external leaks or damage. Repair/replace as necessary. WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow these instructions can result in personal injury or death 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. Turn the ignition off. Install special tool #6539 (5/16") or #6631 (3/8") fuel line adapter. Install the fuel pressure gauge. Start the engine and allow the fuel system to reach maximum pressure. Turn the ignition off. NOTE: Fuel specification is 407 kPa +/- 34 kPa (59 psi +/- 5 psi). Using special tool #C4390, Hose Clamp Pliers, pinch the rubber fuel line between the fuel pressure gauge and the engine. Monitor the fuel pressure gauge for a minimum of 5 minutes. NOTE: The pressure should not fall below 241 kPa (35 psi). Does the pressure fall below the listed specification? Yes Replace the leaking Fuel Injector(s). Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 8 .
8. FUEL INJECTOR OPERATION WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow these instructions can result in personal injury or death. CAUTION: After each Fuel Injector actuation, start the engine to clean the cylinder of fuel. Failure to do so could cause engine damage. Remove special tool #C4390. Start the engine and allow the fuel pressure to reach maximum pressure. Ignition on, engine not running. Using the scan tool, actuate the No.1 Fuel Injector. Monitor the fuel pressure gauge. Does the fuel pressure gauge indicate a drop in fuel pressure? Yes Go To 9 . No Go To 10 . NOTE: Turn the ignition off, remove the Fuel Pressure gauge, and connect the fuel lines before continuing.
9. ENGINE MECHANICAL Check for any of the following conditions/mechanical problems. ENGINE VACUUM - must be at least 13 inches in neutral ENGINE VALVE TIMING - must be within specifications ENGINE COMPRESSION - must be within specifications ENGINE EXHAUST SYSTEM - must be free of any restrictions or leaks. ENGINE PCV SYSTEM - must flow freely TORQUE CONVERTER STALL SPEED - must be within specifications POWER BRAKE BOOSTER - no internal vacuum leaks FUEL - must be free of contamination CAM LOBES - must not be worn excessively CYLINDER LEAKAGE TEST - must be within specifications VALVE SPRINGS - cannot be weak or broken Are there any engine mechanical problems? Yes Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 16 .
10. FUEL INJECTOR Turn the ignition off. Disconnect the No.1 Fuel Injector harness connector. Ignition on, engine not running. NOTE: When a Misfire is detected for a particular cylinder, the PCM will shut down that cylinder's Injector Control circuit. With the scan tool, erase DTCs. Install an Injector Noid light. With the scan tool, actuate the Fuel Injector. Does the Noid light blink/flicker during the actuation? Yes Verify that there is good pin to terminal contact in the related Injector and the Powertrain Control Module connectors. If OK, replace the Fuel Injector. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 11 .
11. (K11) INJECTOR 1 CONTROL 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. Check the (K11) Injector 1 Control circuit for an open, short to ground, and short to voltage. Was a problem found with the (K11) Injector Control No.1 circuit? Yes Repair the excessive resistance or short in the (K11) Injector 1 Control circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 16 .
12. FUEL SUPPLY LINE RESTRICTED WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow these instructions can result in personal injury or death. Turn the ignition off. Raise vehicle on hoist, and disconnect the fuel pressure line at the fuel pump module. Install special tool #6539 (5/16") #6631(3/8") fuel line adapter and the fuel pressure gauge between the fuel supply line and the fuel pump module. Ignition on, engine not running. With the scan tool, actuate the ASD Fuel System test and observe the fuel pressure gauge. NOTE: Fuel pressure specification is 407 kPa +/- 34 kPa (59 psi +/- 5 psi). Is the fuel pressure within specification? Yes Repair or replace fuel supply line as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 13 .
13. FUEL PUMP INLET STRAINER WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow these instructions can result in personal injury or death. Turn the ignition off. Remove the Fuel Pump Module and inspect the Fuel Inlet Strainer. Is the Fuel Inlet Strainer plugged? Yes Replace the Fuel Pump Inlet Strainer. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Before continuing, check the Fuel Pump Module harness connector terminals for corrosion, damage, or terminal push out. Make sure the ground circuit is functional. Repair as necessary. Replace the Fuel Pump Module. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .
14. 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. Disconnect the Ignition Coil harness connector. Using a 12-volt test light connected to 12-volts, probe the (K86) Coil Control 1 circuit. Crank the engine for 5 seconds while observing the test light. Does the test light brightly blink/flicker while the engine was cranking? Yes Verify that there is good pin to terminal contact in the related Injector and the Powertrain Control Module connectors. If OK, replace the Ignition Coil. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 15 .
15. (K86) COIL CONTROL 1 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. Check the (K86) Coil Control 1 circuit for an open, short to ground, and short to voltage. Was a problem found with the (K86) Coil Control 1 circuit? Yes Repair the (K86) Coil Control 1 circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 16 .
16. POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the related Sensor, Coil, Injector, 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 related Sensors, Coils, Injectors, 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-306217-S13377649292008120900000) . No Replace and program the Powertrain Control Module per Service Information. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .

1. When Monitored: Any time the engine is running, and the adaptive numerator has been successfully updated.

1. Set Condition: The threshold to set the fault is application specific; it is tied to the level of misfire that will cause emissions to increase to 1.5 times the standard or in some cases 1%. It is always a two trip fault above the calibrated RPM. It takes 1 soft fail to set a malfunction and two trips to set the MIL. Three good trips to turn off the MIL.

Always perform the PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE before proceeding.

Scheme 144

Scheme 145

Scheme 146

Scheme 147

1. DTC IS ACTIVE Diagnose and repair any other active component or circuit DTCs before continuing with this procedure. Turn the ignition on. With the scan tool, select View DTCs. Copy DTC and Freeze Frame information. 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. NOTE: Attempt to operate the vehicle under conditions similar to which the DTC was set. NOTE: It may be necessary to test drive the vehicle within the DTC monitoring conditions in order for this DTC to set. With a scan tool, select View DTCs. Is the DTC Active at this time? Yes Go To 2 . No Refer to the «INTERMITTENT CONDITION»(ref-306207-S19641665412008120900000) Diagnostic Procedure.
2. VISUAL INSPECTION NOTE: Anything that affects the speed of the crankshaft can cause this DTC to set. NOTE: When a misfire is detected, the PCM will shut down the injector control circuit for the misfiring cylinder. Inspect the engine for any of the following conditions: - Worn serpentine belt - Misalignment or binding water pump, P/S pump or A/C compressor pulleys - Improper CKP, CMP, MAP, or TP Sensor mounting. - Poor connector/terminal to component connection for CKP sensor, CMP sensor, MAP sensor, TP sensor, fuel injector, ignition coil, etc. - Corroded PCM power or ground circuits. - Vacuum leaks. - Restriction in the air induction or exhaust system. - Internal engine component malfunction. NOTE: Misfire may occur and may not be caused by component failure. Any of the following conditions can cause a misfire: - Moisture on ignition system components - Insufficient fuel - Low quality fuel - Manual transmission bog - Towing overload Were any problems found? Yes Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 3 .
3. (F342), (F344) ASD RELAY OUTPUT CIRCUIT Turn the ignition off. Disconnect the Ignition Coil harness connector. Disconnect the Fuel Injector No.2 harness connector. Ignition on, engine not running. With the scan tool, actuate the ASD Relay. Using a 12-volt test light connected to ground, probe the (F342), (F344) ASD Relay Output circuit in the Ignition Coil harness connector and Fuel Injector harness connector while the ASD Relay is actuating. Does the test light illuminate brightly? Yes Go To 4 . No Repair the excessive resistance or short to ground in the (F342), (F344) ASD Relay Output circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .
4. IGNITION SYSTEM OPERATION 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. Turn the ignition off. Connect the Ignition harness connector. Remove the Ignition wire/coil from the Cylinder 2 Spark Plug. Leave the Fuel Injector harness connector of the cylinder being tested disconnected. Install a spark tester on the Ignition wire. While cranking the engine observe the spark coming from the spark tester. NOTE: A crisp blue spark that is able to jump the gap of the spark tester should be generated. Is good spark present? Yes Go To 5 . No Go To 14 . NOTE: Connect the Fuel Injector harness connector before continuing.
5. SPARK PLUG Turn the ignition off. Remove the Spark Plug. Inspect the Spark Plug for the following conditions. - Cracks - Carbon Tracking - Foreign Material - Gap size out of specifications - Loose or broken electrode NOTE: Lightly tap the bottom of the spark plug on a solid surface. The electrode in the spark plug should not move. Were any of the above conditions present? Yes Replace the Spark Plug. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 6 .
6. FUEL PRESSURE CHECK WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow these instructions can result in personal injury or death. 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. Install a fuel pressure gauge to the fuel rail. Start the engine and observe the fuel pressure reading. NOTE: Fuel pressure specification is 407 kPa +/- 34 kPa (59 psi +/- 5 psi). Choose a conclusion that best matches your fuel pressure reading. Within Specification Go To 7 . Below Specification Go To 12 . Above Specification Replace the fuel filter/pressure regulator. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .
7. FUEL PRESSURE LEAK DOWN NOTE: Before continuing visually and physically inspect the fuel delivery system for external leaks or damage. Repair/replace as necessary. WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow these instructions can result in personal injury or death. Turn the ignition off. Install special tool #6539 (5/16") or #6631 (3/8") fuel line adapter. Install the fuel pressure gauge. Start the engine and allow the fuel system to reach maximum pressure. Turn the ignition off. NOTE: Fuel specification is 407 kPa +/- 34 kPa (59 psi +/- 5 psi). Using special tool #C4390, Hose Clamp Pliers, pinch the rubber fuel line between the fuel pressure gauge and the engine. Monitor the fuel pressure gauge for a minimum of 5 minutes. NOTE: The pressure should not fall below 241 kPa (35 psi) Does the pressure fall below the listed specification? Yes Replace the leaking Fuel Injector(s). Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 8 .
8. FUEL INJECTOR OPERATION WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow these instructions can result in personal injury or death. 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. CAUTION: After each Fuel Injector actuation, start the engine to clean the cylinder of fuel. Failure to do so could cause engine damage. Remove special tool #C4390. Start the engine and allow the fuel pressure to reach maximum pressure. Ignition on, engine not running. Using scan tool, actuate the No.2 Fuel Injector. Monitor the fuel pressure gauge. Does the fuel pressure gauge indicate a drop in fuel pressure? Yes Go To 9 . No Go To 10 . NOTE: Turn the ignition off, remove the Fuel Pressure gauge, and connect the fuel lines before continuing.
9. ENGINE MECHANICAL Check for any of the following conditions/mechanical problems. ENGINE VACUUM - must be at least 13 inches in neutral ENGINE VALVE TIMING - must be within specifications ENGINE COMPRESSION - must be within specifications ENGINE EXHAUST SYSTEM - must be free of any restrictions or leaks. ENGINE PCV SYSTEM - must flow freely TORQUE CONVERTER STALL SPEED - must be within specifications POWER BRAKE BOOSTER - no internal vacuum leaks FUEL - must be free of contamination CAM LOBES - must not be worn excessively CYLINDER LEAKAGE TEST - must be within specifications VALVE SPRINGS - cannot be weak or broken Are there any engine mechanical problems? Yes Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 16 .
10. FUEL INJECTOR Turn the ignition off. Disconnect the No.2 Fuel Injector harness connector. Ignition on, engine not running. NOTE: When a Misfire is detected for a particular cylinder, the PCM will shut down that cylinder's Injector Control circuit. With the scan tool, erase DTCs. Install an Injector Noid light. With the scan tool, actuate the Fuel Injector. Does the Noid light blink/flicker during the actuation? Yes Verify that there is good pin to terminal contact in the related Injector and the Powertrain Control Module connectors. If OK, replace the Fuel Injector. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 11 .
11. (K12) INJECTOR 2 CONTROL 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. Check the (K12) Injector 2 Control circuit for an open, short to ground, and short to voltage. Was a problem found with the (K12) Injector 2 Control circuit? Yes Repair the excessive resistance or short in the (K12) Injector 2 Control circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 16 .
12. FUEL SUPPLY LINE RESTRICTED WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow these instructions can result in personal injury or death. Turn the ignition off. Raise vehicle on hoist, and disconnect the fuel pressure line at the fuel pump module. Install special tool #6539 (5/16") #6631(3/8") fuel line adapter and the fuel pressure gauge between the fuel supply line and the fuel pump module. Ignition on, engine not running. With the scan tool, actuate the ASD Fuel System test and observe the fuel pressure gauge. NOTE: Fuel pressure specification is 407 kPa +/- 34 kPa (59 psi +/- 5 psi). Is the fuel pressure within specification? Yes Repair or replace fuel supply line as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 13 .
13. FUEL PUMP INLET STRAINER WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow these instructions can result in personal injury or death. Turn the ignition off. Remove the Fuel Pump Module and inspect the Fuel Inlet Strainer. Is the Fuel Inlet Strainer plugged? Yes Replace the Fuel Pump Inlet Strainer. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Before continuing, check the Fuel Pump Module harness connector terminals for corrosion, damage, or terminal push out. Make sure the ground circuit is functional. Repair as necessary. Replace the Fuel Pump Module. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .
14. 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. Disconnect the Ignition Coil harness connector. Using a 12-volt test light connected to 12-volts, probe the (K85) Coil Control 2 circuit. Crank the engine for 5 seconds. Does the test light brightly blink/flicker while the engine is cranking? Yes Verify that there is good pin to terminal contact in the related Coils and the Powertrain Control Module connectors. If OK, replace the Ignition Coil. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 15 .
15. (K85) COIL CONTROL 2 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. Check the (K85) Coil Control 2 circuit for an open, short to ground, and short to voltage. Was a problem found with the (K85) Coil Control 2 circuit? Yes Repair the (K85) Coil Control 2 circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 16 .
16. POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the related Sensor, Coil, Injector, 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 related Sensors, Coils, Injectors, 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-306217-S13377649292008120900000) . No Replace and program the Powertrain Control Module per Service Information. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .

1. When Monitored: Any time the engine is running, and the adaptive numerator has been successfully updated.

1. Set Condition: The threshold to set the fault is application specific; it is tied to the level of misfire that will cause emissions to increase to 1.5 times the standard or in some cases 1%. It is always a two trip fault above the calibrated RPM. It takes 1 soft fail to set a malfunction and two trips to set the MIL. Three good trips to turn off the MIL.

Always perform the PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE before proceeding.

Scheme 148

Scheme 149

Scheme 150

1. DTC IS ACTIVE Diagnose and repair any other active component or circuit DTCs before continuing with this procedure. Turn the ignition on. With the scan tool, select View DTCs. Copy DTC and Freeze Frame information. 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. NOTE: Attempt to operate the vehicle under conditions similar to which the DTC was set. NOTE: It may be necessary to test drive the vehicle within the DTC monitoring conditions in order for this DTC to set. With a scan tool, select View DTCs. Is the DTC Active at this time? Yes Go To 2 . No Refer to the «INTERMITTENT CONDITION»(ref-306207-S19641665412008120900000) Diagnostic Procedure.
2. VISUAL INSPECTION NOTE: Anything that affects the speed of the crankshaft can cause this DTC to set. NOTE: When a misfire is detected, the PCM will shut down the injector control circuit for the misfiring cylinder. Inspect the engine for any of the following conditions: - Worn serpentine belt - Misalignment or binding water pump, P/S pump or A/C compressor pulleys - Improper CKP, CMP, MAP, or TP Sensor mounting. - Poor connector/terminal to component connection for CKP sensor, CMP sensor, MAP sensor, TP sensor, fuel injector, ignition coil, etc. - Corroded PCM power or ground circuits. - Vacuum leaks. - Restriction in the air induction or exhaust system. - Internal engine component malfunction. NOTE: Misfire may occur and may not be caused by component failure. Any of the following conditions can cause a misfire: - Moisture on ignition system components - Insufficient fuel - Low quality fuel - Manual transmission bog - Towing overload Were any problems found? Yes Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 3 .
3. (F342), (F344) ASD RELAY OUTPUT CIRCUIT Turn the ignition off. Disconnect the Ignition Coil harness connector. Disconnect the No.3 Fuel Injector 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 (F342), (F344) ASD Relay Output circuit in the Ignition Coil harness connector and Fuel Injector harness connector while the ASD Relay is actuating. Does the test light illuminate brightly? Yes Go To 4 . No Repair the excessive resistance or short to ground in the (F342), (F344) ASD Relay Output circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .
4. IGNITION SYSTEM OPERATION 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. Turn the ignition off. Connect the Ignition coil harness connector. Remove the Ignition wire/coil from the Cylinder 3 Spark Plug. Leave the Fuel Injector harness connector of the cylinder being tested disconnected. Install a spark tester on the Ignition wire. While cranking the engine observe the spark coming from the spark tester. NOTE: A crisp blue spark that is able to jump the gap of the spark tester should be generated. Is good spark present? Yes Go To 5 . No Go To 14 . NOTE: Connect the Fuel Injector harness connector before continuing.
5. SPARK PLUG Turn the ignition off. Remove the Spark Plug. Inspect the Spark Plug for the following conditions. - Cracks - Carbon Tracking - Foreign Material - Gap size out of specifications - Loose or broken electrode NOTE: Lightly tap the bottom of the spark plug on a solid surface. The electrode in the spark plug should not move. Were any of the above conditions present? Yes Replace the Spark Plug. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 6 .
6. FUEL PRESSURE CHECK 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. WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow these instructions can result in personal injury or death. Install a fuel pressure gauge to the fuel rail. Start the engine and observe the fuel pressure reading. NOTE: Fuel pressure specification is 407 kPa +/- 34 kPa (59 psi +/- 5 psi). Choose a conclusion that best matches your fuel pressure reading. Within Specification Go To 7 . Below Specification Go To 12 . Above Specification Replace the fuel filter/pressure regulator. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .
7. FUEL PRESSURE LEAK DOWN NOTE: Before continuing visually and physically inspect the fuel delivery system for external leaks or damage. Repair/replace as necessary. WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow these instructions can result in personal injury or death Turn the ignition off. Install special tool #6539 (5/16") or #6631 (3/8") fuel line adapter. Install the fuel pressure gauge. Start the engine and allow the fuel system to reach maximum pressure. Turn the ignition off. NOTE: Fuel specification is 407 kPa +/- 34 kPa (59 psi +/- 5 psi). Using special tool #C4390, Hose Clamp Pliers, pinch the rubber fuel line between the fuel pressure gauge and the engine. Monitor the fuel pressure gauge for a minimum of 5 minutes. NOTE: The pressure should not fall below 241 kPa (35 psi). Does the pressure fall below the listed specification? Yes Replace the leaking Fuel Injector(s). Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 8 .
8. FUEL INJECTOR OPERATION WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow these instructions can result in personal injury or death. CAUTION: After each Fuel Injector actuation, start the engine to clean the cylinder of fuel. Failure to do so could cause engine damage. Remove special tool #C4390. Start the engine and allow the fuel pressure to reach maximum pressure. Ignition on, engine not running. Using a scan tool, actuate the No.3 Fuel Injector. Monitor the fuel pressure gauge. Does the fuel pressure gauge indicate a drop in fuel pressure? Yes Go To 9 . No Go To 10 . NOTE: Turn the ignition off, remove the Fuel Pressure gauge, and connect the fuel lines before continuing.
9. ENGINE MECHANICAL Check for any of the following conditions/mechanical problems. ENGINE VACUUM - must be at least 13 inches in neutral ENGINE VALVE TIMING - must be within specifications ENGINE COMPRESSION - must be within specifications ENGINE EXHAUST SYSTEM - must be free of any restrictions or leaks. ENGINE PCV SYSTEM - must flow freely TORQUE CONVERTER STALL SPEED - must be within specifications POWER BRAKE BOOSTER - no internal vacuum leaks FUEL - must be free of contamination CAM LOBES - must not be worn excessively CYLINDER LEAKAGE TEST - must be within specifications VALVE SPRINGS - cannot be weak or broken Are there any engine mechanical problems? Yes Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 16 .
10. FUEL INJECTOR Turn the ignition off. Disconnect the No.3 Fuel Injector harness connector. Ignition on, engine not running. NOTE: When a Misfire is detected for a particular cylinder, the PCM will shut down that cylinder's Injector Control circuit. With the scan tool, erase DTCs. Install an Injector Noid light. With the scan tool, actuate the Fuel Injector. Does the Noid light blink/flicker during the actuation? Yes Verify that there is good pin to terminal contact in the related Injector and the Powertrain Control Module connectors. If OK, replace the Fuel Injector. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 11 .
11. (K13) INJECTOR 3 CONTROL 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. Check the (K13) Injector 3 Control circuit for an open, short to ground, and short to voltage. Was a problem found with the (K13) Injector 3 Control circuit? Yes Repair the excessive resistance or short in the (K13) Injector 3 Control circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 16 .
12. FUEL SUPPLY LINE RESTRICTED WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow these instructions can result in personal injury or death. Turn the ignition off. Raise vehicle on hoist, and disconnect the fuel pressure line at the fuel pump module. Install special tool #6539 (5/16") #6631(3/8") fuel line adapter and the fuel pressure gauge between the fuel supply line and the fuel pump module. Ignition on, engine not running. With a scan tool, actuate the ASD Fuel System test and observe the fuel pressure gauge. NOTE: Fuel pressure specification is 407 kPa +/- 34 kPa (59 psi +/- 5 psi). Is the fuel pressure within specification? Yes Repair or replace fuel supply line as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 13 .
13. FUEL PUMP INLET STRAINER WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow these instructions can result in personal injury or death. Turn the ignition off. Remove the Fuel Pump Module and inspect the Fuel Inlet Strainer. Is the Fuel Inlet Strainer plugged? Yes Replace the Fuel Pump Inlet Strainer. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Before continuing, check the Fuel Pump Module harness connector terminals for corrosion, damage, or terminal push out. Make sure the ground circuit is functional. Repair as necessary. Replace the Fuel Pump Module. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .
14. 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. Disconnect the No.3 Ignition Coil harness connector. Using a 12-volt test light connected to 12-volts, probe the (K93) Coil Control 3 circuit. NOTE: Make sure the test light is probing the circuit before actuating the Coil or a DTC may set and not allow the actuation. Crank the engine for 5 seconds while observing the test light. Does the test light brightly blink/flicker while the engine is cranking? Yes Verify that there is good pin to terminal contact in the related Coil and the Powertrain Control Module connectors. If OK, replace the Ignition Coil. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 15 .
15. (K93) COIL CONTROL 3 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. Check the (K93) Coil Control 3 circuit for an open, short to ground, and short to voltage. Was a problem found with the (K93) Coil Control 3 circuit? Yes Repair the (K93) Coil Control 3 circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 16 .
16. POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the related Sensor, Coil, Injector, 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 related Sensors, Coils, Injectors, 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-306217-S13377649292008120900000) . No Replace and program the Powertrain Control Module per Service Information. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .

1. When Monitored: Any time the engine is running, and the adaptive numerator has been successfully updated.

1. Set Condition: The threshold to set the fault is application specific; it is tied to the level of misfire that will cause emissions to increase to 1.5 times the standard or in some cases 1%. It is always a two trip fault above the calibrated RPM. It takes 1 soft fail to set a malfunction and two trips to set the MIL. Three good trips to turn off the MIL.

Always perform the PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE before proceeding.

Scheme 151

Scheme 152

Scheme 153

1. DTC IS ACTIVE Diagnose and repair any other active component or circuit DTCs before continuing with this procedure. Turn the ignition on. With the scan tool, select View DTCs. Copy DTC and Freeze Frame information. 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. NOTE: Attempt to operate the vehicle under conditions similar to which the DTC was set. NOTE: It may be necessary to test drive the vehicle within the DTC monitoring conditions in order for this DTC to set. With a scan tool, select View DTCs. Is the DTC Active at this time? Yes Go To 2 . No Refer to the «INTERMITTENT CONDITION»(ref-306207-S19641665412008120900000) Diagnostic Procedure.
2. VISUAL INSPECTION NOTE: Anything that affects the speed of the crankshaft can cause this DTC to set. NOTE: When a misfire is detected, the PCM will shut down the injector control circuit for the misfiring cylinder. Inspect the engine for any of the following conditions: - Worn serpentine belt - Misalignment or binding water pump, P/S pump or A/C compressor pulleys - Improper CKP, CMP, MAP, or TP Sensor mounting. - Poor connector/terminal to component connection for CKP sensor, CMP sensor, MAP sensor, TP sensor, fuel injector, ignition coil, etc. - Corroded PCM power or ground circuits. - Vacuum leaks. - Restriction in the air induction or exhaust system. - Internal engine component malfunction. NOTE: Misfire may occur and may not be caused by component failure. Any of the following conditions can cause a misfire: - Moisture on ignition system components - Insufficient fuel - Low quality fuel - Manual transmission bog - Towing overload Were any problems found? Yes Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 3 .
3. (F342), (F344) ASD RELAY OUTPUT CIRCUIT Turn the ignition off. Disconnect the Ignition Coil harness connector. Disconnect the No.4 Fuel Injector harness connector. Ignition on, engine not running. With the scan tool, actuate the ASD Relay. Using a 12-volt test light connected to ground, probe the (F342), (F344) ASD Relay Output circuit in the Ignition Coil harness connector and Fuel Injector harness connector while the ASD Relay is actuating. Does the test light illuminate brightly? Yes Go To 4 . No Repair the excessive resistance or short to ground in the (F342), (F344) ASD Relay Output circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .
4. IGNITION SYSTEM OPERATION Turn the ignition off. Connect the Ignition Coil harness connector. Disconnect the Ignition wire/coil from the Cylinder 4 Spark Plug. Leave the Fuel Injector harness connector of the cylinder being tested disconnected. Install a spark tester on the Ignition wire. While cranking the engine observe the spark coming from the spark tester. NOTE: A crisp blue spark that is able to jump the gap of the spark tester should be generated. Is good spark present? Yes Go To 5 . No Go To 14 . NOTE: Connect the Fuel Injector harness connector before continuing.
5. SPARK PLUG Turn the ignition off. Remove the Spark Plug. Inspect the Spark Plug for the following conditions. - Cracks - Carbon Tracking - Foreign Material - Gap size out of specifications - Loose or broken electrode NOTE: Lightly tap the bottom of the spark plug on a solid surface. The electrode in the spark plug should not move. Were any of the above conditions present? Yes Replace the Spark Plug. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 6 .
6. FUEL PRESSURE CHECK WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow these instructions can result in personal injury or death. Install a fuel pressure gauge to the fuel rail. Start the engine and observe the fuel pressure reading. NOTE: Fuel pressure specification is 407 kPa +/- 34 kPa (59 psi +/- 5 psi). Choose a conclusion that best matches your fuel pressure reading. Within Specification Go To 7 . Below Specification Go To 12 . Above Specification Replace the fuel filter/pressure regulator. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .
7. FUEL PRESSURE LEAK DOWN NOTE: Before continuing visually and physically inspect the fuel delivery system for external leaks or damage. Repair/replace as necessary. WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow these instructions can result in personal injury or death Turn the ignition off. Install special tool #6539 (5/16") or #6631 (3/8") fuel line adapter. Install the fuel pressure gauge. Start the engine and allow the fuel system to reach maximum pressure. Turn the ignition off. NOTE: Fuel specification is 407 kPa +/- 34 kPa (59 psi +/- 5 psi). Using special tool #C4390, Hose Clamp Pliers, pinch the rubber fuel line between the fuel pressure gauge and the engine. Monitor the fuel pressure gauge for a minimum of 5 minutes. NOTE: The pressure should not fall below 241 kPa (35 psi) Does the pressure fall below the listed specification? Yes Replace the leaking Fuel Injector(s). Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 8 .
8. FUEL INJECTOR OPERATION WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow these instructions can result in personal injury or death. CAUTION: After each Fuel Injector actuation, start the engine to clean the cylinder of fuel. Failure to do so could cause engine damage. Remove special tool #C4390. Start the engine and allow the fuel pressure to reach maximum pressure. Ignition on, engine not running. Using the scan tool, actuate the No.4 Fuel Injector. Monitor the fuel pressure gauge. Does the fuel pressure gauge indicate a drop in fuel pressure? Yes Go To 9 . No Go To 10 . NOTE: Turn the ignition off, remove the Fuel Pressure gauge, and connect the fuel lines before continuing.
9. ENGINE MECHANICAL Check for any of the following conditions/mechanical problems. ENGINE VACUUM - must be at least 13 inches in neutral ENGINE VALVE TIMING - must be within specifications ENGINE COMPRESSION - must be within specifications ENGINE EXHAUST SYSTEM - must be free of any restrictions or leaks. ENGINE PCV SYSTEM - must flow freely TORQUE CONVERTER STALL SPEED - must be within specifications POWER BRAKE BOOSTER - no internal vacuum leaks FUEL - must be free of contamination CAM LOBES - must not be worn excessively CYLINDER LEAKAGE TEST - must be within specifications VALVE SPRINGS - cannot be weak or broken Are there any engine mechanical problems? Yes Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 16 .
10. FUEL INJECTOR Turn the ignition off. Disconnect the No.4 Fuel Injector harness connector. Ignition on, engine not running. NOTE: When a Misfire is detected for a particular cylinder, the PCM will shut down that cylinder's Injector Control circuit. With the scan tool, erase DTCs. Install an Injector Noid light. With the scan tool, actuate the Fuel Injector. Does the Noid light blink/flicker during the actuation? Yes Verify that there is good pin to terminal contact in the related Injector and the Powertrain Control Module connectors. If OK, replace the Fuel Injector. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 11 .
11. (K14) INJECTOR 4 CONTROL 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. Check the (K14) Injector 4 Control circuit for an open, short to ground, and short to voltage. Was a problem found with the (K14) Injector 4 Control circuit? Yes Repair the excessive resistance or short in the (K14) Injector 4 Control circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 16 .
12. FUEL SUPPLY LINE RESTRICTED WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow these instructions can result in personal injury or death. Turn the ignition off. Raise vehicle on hoist, and disconnect the fuel pressure line at the fuel pump module. Install special tool #6539 (5/16") #6631(3/8") fuel line adapter and the fuel pressure gauge between the fuel supply line and the fuel pump module. Ignition on, engine not running. With the scan tool, actuate the ASD Fuel System test and observe the fuel pressure gauge. NOTE: Fuel pressure specification is 407 kPa +/- 34 kPa (59 psi +/- 5 psi). Is the fuel pressure within specification? Yes Repair or replace fuel supply line as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 13 .
13. FUEL PUMP INLET STRAINER WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow these instructions can result in personal injury or death. Turn the ignition off. Remove the Fuel Pump Module and inspect the Fuel Inlet Strainer. Is the Fuel Inlet Strainer plugged? Yes Replace the Fuel Pump Inlet Strainer. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Before continuing, check the Fuel Pump Module harness connector terminals for corrosion, damage, or terminal push out. Make sure the ground circuit is functional. Repair as necessary. Replace the Fuel Pump Module. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .
14. IGNITION COIL Disconnect the No.4 Ignition Coil harness connector. Using a 12-volt test light connected to 12-volts, probe the (K15) Coil Control 4 circuit. With a scan tool, actuate the No.4 Ignition Coil. Does the test light brightly blink/flicker during the actuation? Yes Verify that there is good pin to terminal contact in the related Coil and the Powertrain Control Module connectors. If OK, replace the Ignition Coil. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 15 .
15. (K15) COIL CONTROL 4 CIRCUIT 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. Disconnect the Ignition Coil harness connector. Using a 12-volt test light connected to 12-volts, probe the (K15) Coil Control 4 circuit. Crank the engine for 5 seconds while observing the test light. Does the test light brightly blink/flicker while the engine was cranking? Yes Repair the (K15) Coil control 4 circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 16 .
16. POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the related Sensor, Coil, Injector, 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 related Sensors, Coils, Injectors, 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-306217-S13377649292008120900000) . No Replace and program the Powertrain Control Module per Service Information. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .

1. When Monitored: Any time the engine is running, and the adaptive numerator has been successfully updated.

1. Set Condition: The threshold to set the fault is application specific; it is tied to the level of misfire that will cause emissions to increase to 1.5 times the standard or in some cases 1%. It is always a two trip fault above the calibrated RPM. It takes 1 soft fail to set a malfunction and two trips to set the MIL. Three good trips to turn off the MIL.

Always perform the PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE before proceeding.

Scheme 154

Scheme 155

Scheme 156

1. DTC IS ACTIVE Diagnose and repair any other active component or circuit DTCs before continuing with this procedure. Turn the ignition on. With the scan tool, select View DTCs. Copy DTC and Freeze Frame information. 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. NOTE: Attempt to operate the vehicle under conditions similar to which the DTC was set. NOTE: It may be necessary to test drive the vehicle within the DTC monitoring conditions in order for this DTC to set. With a scan tool, select View DTCs. Is the DTC Active at this time? Yes Go To 2 . No Refer to the «INTERMITTENT CONDITION»(ref-306207-S19641665412008120900000) Diagnostic Procedure.
2. VISUAL INSPECTION NOTE: Anything that affects the speed of the crankshaft can cause this DTC to set. NOTE: When a misfire is detected, the PCM will shut down the injector control circuit for the misfiring cylinder. Inspect the engine for any of the following conditions: - Worn serpentine belt - Misalignment or binding water pump, P/S pump or A/C compressor pulleys - Improper CKP, CMP, MAP, or TP Sensor mounting. - Poor connector/terminal to component connection for CKP sensor, CMP sensor, MAP sensor, TP sensor, fuel injector, ignition coil, etc. - Corroded PCM power or ground circuits. - Vacuum leaks. - Restriction in the air induction or exhaust system. - Internal engine component malfunction. NOTE: Misfire may occur and may not be caused by component failure. Any of the following conditions can cause a misfire: - Moisture on ignition system components - Insufficient fuel - Low quality fuel - Manual transmission bog - Towing overload Were any problems found? Yes Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 3 .
3. (F342), (F344) ASD RELAY OUTPUT CIRCUIT Turn the ignition off. Disconnect the Ignition Coil harness connector. Disconnect the No.5 Fuel Injector harness connector. Ignition on, engine not running. With the scan tool, actuate the ASD Relay. Using a 12-volt test light connected to ground, probe the (F342), (F344) ASD Relay Output circuit in the Ignition Coil harness connector and Fuel Injector harness connector while the ASD Relay is actuating. Does the test light illuminate brightly? Yes Go To 4 . No Repair the excessive resistance or short to ground in the (F342), (F344) ASD Relay Output circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .
4. IGNITION SYSTEM OPERATION Turn the ignition off. Connect the Ignition Coil harness connector. Disconnect the Ignition wire/coil from the cylinder 5 spark plug. Leave the Fuel Injector harness connector of the cylinder being tested disconnected. Install a spark tester on the Ignition wire. While cranking the engine observe the spark coming from the spark tester. NOTE: A crisp blue spark that is able to jump the gap of the spark tester should be generated. Is good spark present? Yes Go To 5 . No Go To 14 . NOTE: Connect the Fuel Injector harness connector before continuing.
5. SPARK PLUG Turn the ignition off. Remove the Spark Plug. Inspect the Spark Plug for the following conditions. - Cracks - Carbon Tracking - Foreign Material - Gap size out of specifications - Loose or broken electrode NOTE: Lightly tap the bottom of the spark plug on a solid surface. The electrode in the spark plug should not move. Were any of the above conditions present? Yes Replace the Spark Plug. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 6 .
6. FUEL PRESSURE CHECK WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow these instructions can result in personal injury or death. Install a fuel pressure gauge to the fuel rail. Start the engine and observe the fuel pressure reading. NOTE: Fuel pressure specification is 407 kPa +/- 34 kPa (59 psi +/- 5 psi). Choose a conclusion that best matches your fuel pressure reading. Within Specification Go To 7 . Below Specification Go To 12 . Above Specification Replace the fuel filter/pressure regulator. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .
7. FUEL PRESSURE LEAK DOWN NOTE: Before continuing visually and physically inspect the fuel delivery system for external leaks or damage. Repair/replace as necessary. WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow these instructions can result in personal injury or death. Turn the ignition off. Install special tool #6539 (5/16") or #6631 (3/8") fuel line adapter. Install the fuel pressure gauge. Start the engine and allow the fuel system to reach maximum pressure. Turn the ignition off. NOTE: Fuel specification is 407 kPa +/- 34 kPa (59 psi +/- 5 psi). Using special tool #C4390, Hose Clamp Pliers, pinch the rubber fuel line between the fuel pressure gauge and the engine. Monitor the fuel pressure gauge for a minimum of 5 minutes. NOTE: The pressure should not fall below 241 kPa (35 psi). Does the pressure fall below the listed specification? Yes Replace the leaking Fuel Injector(s). Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 8 .
8. FUEL INJECTOR OPERATION WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow these instructions can result in personal injury or death. CAUTION: After each Fuel Injector actuation, start the engine to clean the cylinder of fuel. Failure to do so could cause engine damage. Remove special tool #C4390. Start the engine and allow the fuel pressure to reach maximum pressure. Ignition on, engine not running. Using the scan tool, actuate the No.5 Fuel Injector. Monitor the fuel pressure gauge. Does the fuel pressure gauge indicate a drop in fuel pressure? Yes Go To 9 . No Go To 10 . NOTE: Turn the ignition off, remove the Fuel Pressure gauge, and connect the fuel lines before continuing.
9. ENGINE MECHANICAL Check for any of the following conditions/mechanical problems. ENGINE VACUUM - must be at least 13 inches in neutral ENGINE VALVE TIMING - must be within specifications ENGINE COMPRESSION - must be within specifications ENGINE EXHAUST SYSTEM - must be free of any restrictions or leaks. ENGINE PCV SYSTEM - must flow freely TORQUE CONVERTER STALL SPEED - must be within specifications POWER BRAKE BOOSTER - no internal vacuum leaks FUEL - must be free of contamination CAM LOBES - must not be worn excessively CYLINDER LEAKAGE TEST - must be within specifications VALVE SPRINGS - cannot be weak or broken Are there any engine mechanical problems? Yes Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 16 .
10. FUEL INJECTOR Turn the ignition off. Disconnect the No.5 Fuel Injector harness connector. Ignition on, engine not running. NOTE: When a Misfire is detected for a particular cylinder, the PCM will shut down that cylinder's Injector Control circuit. With the scan tool, erase DTCs. Install an Injector Noid light. With the scan tool, actuate the Fuel Injector. Does the Noid light blink/flicker during the actuation? Yes Verify that there is good pin to terminal contact in the related Injector and the Powertrain Control Module connectors. If OK, replace the Fuel Injector. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 11 .
11. (K38) INJECTOR 5 CONTROL 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. Check the (K38) Injector 5 Control circuit for an open, short to ground, and short to voltage. Was a problem found with the (K38) Injector 5 Control circuit? Yes Repair the excessive resistance or short in the (K38) Injector 5 Control circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 16 .
12. FUEL SUPPLY LINE RESTRICTED WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow these instructions can result in personal injury or death. Turn the ignition off. Raise vehicle on hoist, and disconnect the fuel pressure line at the fuel pump module. Install special tool #6539 (5/16") #6631(3/8") fuel line adapter and the fuel pressure gauge between the fuel supply line and the fuel pump module. Ignition on, engine not running. With the scan tool, actuate the ASD Fuel System test and observe the fuel pressure gauge. NOTE: Fuel pressure specification is 407 kPa +/- 34 kPa (59 psi +/- 5 psi). Is the fuel pressure within specification? Yes Repair or replace fuel supply line as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 13 .
13. FUEL PUMP INLET STRAINER WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow these instructions can result in personal injury or death. Turn the ignition off. Remove the Fuel Pump Module and inspect the Fuel Inlet Strainer. Is the Fuel Inlet Strainer plugged? Yes Replace the Fuel Pump Inlet Strainer. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Before continuing, check the Fuel Pump Module harness connector terminals for corrosion, damage, or terminal push out. Make sure the ground circuit is functional. Repair as necessary. Replace the Fuel Pump Module. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .
14. 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. Disconnect the No.5 Ignition Coil harness connector. Using a 12-volt test light connected to 12-volts, probe the (K16) Coil Control 5 circuit. Crank the engine for 5 seconds while observing the test light. Does the test light brightly blink/flicker while the engine was cranking? Yes Verify that there is good pin to terminal contact in the related Coil and the Powertrain Control Module connectors. If OK, replace the Ignition Coil. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 15 .
15. (K16) COIL CONTROL 5 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. Check the (K16) Coil Control 5 circuit for an open, short to ground, and short to voltage. Was a problem found with the (K16) Coil Control 2 circuit? Yes Repair the (K16) Coil Control 5 circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 16 .
16. POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the related Sensor, Coil, Injector, 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 related Sensors, Coils, Injectors, 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-306217-S13377649292008120900000) . No Replace and program the Powertrain Control Module per Service Information. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .

1. When Monitored: Any time the engine is running, and the adaptive numerator has been successfully updated.

1. Set Condition: The threshold to set the fault is application specific; it is tied to the level of misfire that will cause emissions to increase to 1.5 times the standard or in some cases 1%. It is always a two trip fault above the calibrated RPM. It takes 1 soft fail to set a malfunction and two trips to set the MIL. Three good trips to turn off the MIL.

Always perform the PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE before proceeding.

Scheme 157

Scheme 158

Scheme 159

1. DTC IS ACTIVE Diagnose and repair any other active component or circuit DTCs before continuing with this procedure. Turn the ignition on. With the scan tool, select View DTCs. Copy DTC and Freeze Frame information. 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. NOTE: Attempt to operate the vehicle under conditions similar to which the DTC was set. NOTE: It may be necessary to test drive the vehicle within the DTC monitoring conditions in order for this DTC to set. With a scan tool, select View DTCs. Is the DTC Active at this time? Yes Go To 2 . No Refer to the «INTERMITTENT CONDITION»(ref-306207-S19641665412008120900000) Diagnostic Procedure.
2. VISUAL INSPECTION NOTE: Anything that affects the speed of the crankshaft can cause this DTC to set. NOTE: When a misfire is detected, the PCM will shut down the injector control circuit for the misfiring cylinder. Inspect the engine for any of the following conditions: - Worn serpentine belt - Misalignment or binding water pump, P/S pump or A/C compressor pulleys - Improper CKP, CMP, MAP, or TP Sensor mounting. - Poor connector/terminal to component connection for CKP sensor, CMP sensor, MAP sensor, TP sensor, fuel injector, ignition coil, etc. - Corroded PCM power or ground circuits. - Vacuum leaks. - Restriction in the air induction or exhaust system. - Internal engine component malfunction. NOTE: Misfire may occur and may not be caused by component failure. Any of the following conditions can cause a misfire: - Moisture on ignition system components - Insufficient fuel - Low quality fuel - Manual transmission bog - Towing overload Were any problems found? Yes Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 3 .
3. (F342), (F344) ASD RELAY OUTPUT CIRCUIT Turn the ignition off. Disconnect the No. 6 Ignition Coil harness connector. Disconnect the No.6 Fuel Injector harness connector. Ignition on, engine not running. With the scan tool, actuate the ASD Relay. Using a 12-volt test light connected to ground, probe the (F342), (F344) ASD Relay Output circuit in the Ignition Coil harness connector and Fuel Injector harness connector while the ASD Relay is actuating. Does the test light illuminate brightly? Yes Go To 4 . No Repair the excessive resistance or short to ground in the (F342), (F344) ASD Relay Output circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .
4. IGNITION SYSTEM OPERATION Turn the ignition off. Connect the Ignition Coil harness connector. Disconnect the Ignition wire/coil from the spark plug. Leave the Fuel Injector harness connector of the cylinder being tested disconnected. Install a spark tester on the Ignition wire. While cranking the engine observe the spark coming from the spark tester. NOTE: A crisp blue spark that is able to jump the gap of the spark tester should be generated. Is good spark present? Yes Go To 5 . No Go To 14 . NOTE: Connect the Fuel Injector harness connector before continuing.
5. SPARK PLUG Turn the ignition off. Remove the Spark Plug. Inspect the Spark Plug for the following conditions. - Cracks - Carbon Tracking - Foreign Material - Gap size out of specifications - Loose or broken electrode NOTE: Lightly tap the bottom of the spark plug on a solid surface. The electrode in the spark plug should not move. Were any of the above conditions present? Yes Replace the Spark Plug. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 6 .
6. FUEL PRESSURE CHECK WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow these instructions can result in personal injury or death. Install a fuel pressure gauge to the fuel rail. Start the engine and observe the fuel pressure reading. Choose a conclusion that best matches your fuel pressure reading. Within Specification Go To 7 . Below Specification Go To 12 . Above Specification Replace the fuel filter/pressure regulator. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . NOTE: Fuel pressure specification is 407 kPa +/- 34 kPa (59 psi +/- 5 psi).
7. FUEL PRESSURE LEAK DOWN NOTE: Before continuing visually and physically inspect the fuel delivery system for external leaks or damage. Repair / replace as necessary. WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow these instructions can result in personal injury or death Turn the ignition off. Install special tool #6539 (5/16") or #6631 (3/8") fuel line adapter. Install the fuel pressure gauge. Start the engine and allow the fuel system to reach maximum pressure. Turn the ignition off. NOTE: Fuel specification is 407 kPa +/- 34 kPa (59 psi +/- 5 psi). Using special tool #C4390, Hose Clamp Pliers, pinch the rubber fuel line between the fuel pressure gauge and the engine. Monitor the fuel pressure gauge for a minimum of 5 minutes. NOTE: The pressure should not fall below 241 kPa (35 psi). Does the pressure fall below the listed specification? Yes Replace the leaking Fuel Injector(s). Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 8 .
8. FUEL INJECTOR OPERATION WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow these instructions can result in personal injury or death. CAUTION: After each Fuel Injector actuation, start the engine to clean the cylinder of fuel. Failure to do so could cause engine damage. Remove special tool #C4390. Start the engine and allow the fuel pressure to reach maximum pressure. Ignition on, engine not running. Using the scan tool, actuate the No.6 Fuel Injector. Monitor the fuel pressure gauge. Does the fuel pressure gauge indicate a drop in fuel pressure? Yes Go To 9 . No Go To 10 . NOTE: Turn the ignition off, remove the Fuel Pressure gauge, and connect the fuel lines before continuing.
9. ENGINE MECHANICAL Check for any of the following conditions/mechanical problems. ENGINE VACUUM - must be at least 13 inches in neutral ENGINE VALVE TIMING - must be within specifications ENGINE COMPRESSION - must be within specifications ENGINE EXHAUST SYSTEM - must be free of any restrictions or leaks. ENGINE PCV SYSTEM - must flow freely TORQUE CONVERTER STALL SPEED - must be within specifications POWER BRAKE BOOSTER - no internal vacuum leaks FUEL - must be free of contamination CAM LOBES - must not be worn excessively CYLINDER LEAKAGE TEST - must be within specifications VALVE SPRINGS - cannot be weak or broken Are there any engine mechanical problems? Yes Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 16 .
10. FUEL INJECTOR Turn the ignition off. Disconnect the No.6 Fuel Injector harness connector. Ignition on, engine not running. NOTE: When a Misfire is detected for a particular cylinder, the PCM will shut down that cylinder's Injector Control circuit. With the scan tool, erase DTCs. Install an Injector Noid light. With the scan tool, actuate the Fuel Injector. Does the Noid light blink/flicker during the actuation? Yes Verify that there is good pin to terminal contact in the related Injector and the Powertrain Control Module connectors. If OK, replace the Fuel Injector. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 11 .
11. (K58) INJECTOR 6 CONTROL 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. Check the (K58) Injector 6 Control circuit for an open, short to ground, and short to voltage. Was a problem found with the (K58) Injector 6 Control circuit? Yes Repair the excessive resistance or short in the (K58) Injector 6 Control circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 16 .
12. FUEL SUPPLY LINE RESTRICTED WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow these instructions can result in personal injury or death. Turn the ignition off. Raise vehicle on hoist, and disconnect the fuel pressure line at the fuel pump module. Install special tool #6539 (5/16") #6631(3/8") fuel line adapter and the fuel pressure gauge between the fuel supply line and the fuel pump module. Ignition on, engine not running. With the scan tool, actuate the ASD Fuel System test and observe the fuel pressure gauge. NOTE: Fuel pressure specification is 407 kPa +/- 34 kPa (59 psi +/- 5 psi). Is the fuel pressure within specification? Yes Repair or replace fuel supply line as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 13 .
13. FUEL PUMP INLET STRAINER WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow these instructions can result in personal injury or death. Turn the ignition off. Remove the Fuel Pump Module and inspect the Fuel Inlet Strainer. Is the Fuel Inlet Strainer plugged? Yes Replace the Fuel Pump Inlet Strainer. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Before continuing, check the Fuel Pump Module harness connector terminals for corrosion, damage, or terminal push out. Make sure the ground circuit is functional. Repair as necessary. Replace the Fuel Pump Module. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .
14. 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. Disconnect the Ignition Coil harness connector. Using a 12-volt test light connected to 12-volts, probe the (K10) Coil Control 6 circuit. Using a scan tool, actuate the No.6 Ignition Coil. Does the test light brightly blink/flicker during the actuation? Yes Verify that there is good pin to terminal contact in the related Coil and the Powertrain Control Module connectors. If OK, replace the Ignition Coil. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 15 .
15. (K10) COIL CONTROL 6 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. Check the (K10) Coil Control 6 circuit for an open, short to ground, and short to voltage. Was a problem found with the (K10) Coil Control 6 circuit? Yes Repair the (K10) COIL CONTROL 6 circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 16 .
16. POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the related Sensor, Coil, Injector, 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 related Sensors, Coils, Injectors, 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-306217-S13377649292008120900000) . No Replace and program the Powertrain Control Module per Service Information. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .

Scheme 160

1. When Monitored: Under closed throttle decel and A/C off. ECT above 75° C (167° F). Engine start time is greater than 50 seconds.

1. Set Condition: One of the CKP sensor target windows has more than 2.86% variance from the reference. One Trip Fault. Three good trips to turn off the MIL.

Always perform the PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE before proceeding.

1. When Monitored: This monitor runs above 2000 RPM, under open throttle conditions. The Knock diagnostic does not run at idle or during decelerations. The high voltage test runs all the times the engine is running.

1. Set Condition: The High voltage fault will set at 4.8 volts. Two Trip Fault. Three good trips to turn off the MIL.

Always perform the PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE before proceeding.

Scheme 161

Scheme 162

Scheme 163

Scheme 164

Scheme 165

1. ACTIVE DTC Start the engine. Allow the engine to reach normal operating temperature. 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 or Pending at this time? Yes Go To 2 . No Refer to the «INTERMITTENT CONDITION»(ref-306207-S19641665412008120900000) Diagnostic Procedure.
2. (K42) KS SIGNAL 1 SHORTED TO VOLTAGE Turn the ignition off. Disconnect the Knock Sensor harness connector. Disconnect the C2 PCM harness connector. Ignition on, engine not running. Measure the voltage on the (K42) KS Signal 1 circuit in the Knock Sensor harness connector. Is there any voltage present? Yes Repair the short to voltage in the (K42) KS Signal 1 circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 3 .
3. (K42) KS SIGNAL 1 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 (K42) KS Signal 1 circuit from the Knock 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 (K42) KS Signal 1 circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .
4. (K942) KS RETURN 1 CIRCUIT OPEN Measure the resistance of the (K942) KS Return 1 circuit from the Knock Sensor 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 (K942) KS Return 1 circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .
5. (K42) KS SIGNAL 1 SHORTED TO THE (K942) KS RETURN 1 CIRCUIT Measure the resistance between the (K42) KS Signal 1 circuit and the (K942) KS Return 1 circuit in the Knock Sensor harness connector. Is the resistance below 100 ohms? Yes Repair the short between the (K42) KS Signal 1 circuit and the (K942) KS Return 1 circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 6 .
6. (K42) KS SIGNAL 1 SHORTED TO GROUND Measure the resistance between ground and the (K42) KS Signal 1 circuit in the Knock Sensor harness connector. Is the resistance below 100 ohms? Yes Repair the short to ground in the (K42) KS Signal 1 circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 7 .
7. KNOCK SENSOR 1 Turn the ignition off. Verify that there is good pin to terminal contact in the Knock Sensor and Powertrain Control Module connectors. If the connectors are OK, replace the Knock Sensor 1. Connect the Powertrain Control Module (PCM) connector. Turn the ignition on. With the scan tool, clear DTCs. 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: It may be necessary to test drive the vehicle within the DTC monitoring conditions in order for this DTC to reset. With the scan tool, select View DTCs. Is the DTC Active at this time? Yes Go To 8 . No Test complete. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .
8. POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Knock Sensor 1 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. Refer to any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Replace and program the Powertrain Control Module (PCM) in accordance with the Service Information. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .

1. When Monitored: This monitor runs above 2000 RPM, under open throttle conditions. The Knock diagnostic does not run at idle or during decelerations. The high voltage test runs all the times the engine is running.

1. Set Condition: The High voltage fault will set at 4.8 volts. Two Trip Fault. Three good trips to turn off the MIL.

Always perform the PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE before proceeding.

Scheme 166

Scheme 167

Scheme 168

Scheme 169

Scheme 170

1. ACTIVE DTC Start the engine. Allow the engine to reach normal operating temperature. 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 or Pending at this time? Yes Go To 2 . No Refer to the «INTERMITTENT CONDITION»(ref-306207-S19641665412008120900000) Diagnostic Procedure.
2. (K242) KS SIGNAL 2 SHORTED TO VOLTAGE Turn the ignition off. Disconnect the No.2 Knock Sensor harness connector. Disconnect the C2 PCM harness connector. Ignition on, engine not running. Measure the voltage on the (K242) KS Signal 2 circuit in the Knock Sensor harness connector. Is there any voltage present? Yes Repair the short to voltage in the (K242) KS Signal 2 circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 3 .
3. (K242) KS SIGNAL 2 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 (K242) KS Signal 2 circuit from the Knock 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 (K242) KS Signal 2 circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .
4. (K924) KS RETURN 2 CIRCUIT OPEN Measure the resistance of the (K924) KS Return 2 circuit from the Knock Sensor 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 (K924) KS Return 2 circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .
5. (K242) KS SIGNAL 2 SHORTED TO THE (K924) KS RETURN 2 CIRCUIT Measure the resistance between the (K242) KS Return 2 circuit and the (K924) KS Return 2 circuit in the Knock Sensor harness connector. Is the resistance below 100 ohms? Yes Repair the short between the (K242) KS Signal 2 circuit and the (K924) KS Return 2 circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 6 .
6. (K242) KS SIGNAL 2 SHORTED TO GROUND Measure the resistance between ground and the (K242) KS Signal 2 circuit in the Knock Sensor harness connector. Is the resistance below 100 ohms? Yes Repair the short to ground in the (K242) KS Signal 2 circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 7 .
7. KNOCK SENSOR 2 Turn the ignition off. Verify that there is good pin to terminal contact in the Knock Sensor and Powertrain Control Module connectors. If the connectors are OK, replace the Knock Sensor 2. Connect the Powertrain Control Module (PCM) connector. Turn the ignition on. With the scan tool, clear DTCs. 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: It may be necessary to test drive the vehicle within the DTC monitoring conditions in order for this DTC to reset. With the scan tool, select View DTCs. Is the status Active for this DTC? Yes Go to 8 . No Test complete. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .
8. POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Knock Sensor 2 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. Refer to any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Replace and program the Powertrain Control Module (PCM) in accordance with the Service Information. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .

1. When Monitored: During engine cranking and with the engine running. Battery voltage greater than 10 volts.

1. Set Condition: No CKP signal is present during engine cranking, and at least 8 camshaft position sensor signals have occurred within 8 seconds. One Trip Fault. Three good trips to turn off the MIL.

Always perform the PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE before proceeding.

Scheme 171

Scheme 172

Scheme 173

Scheme 174

Scheme 175

Scheme 176

Scheme 177

Scheme 178

1. ACTIVE DTC Turn the ignition on. With the scan tool, select View DTCs. Copy DTC and Freeze Frame information. 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. NOTE: Attempt to operate the vehicle under conditions similar to which the DTC was set. NOTE: It may be necessary to test drive the vehicle within the DTC monitoring conditions in order for this DTC to set. With a scan tool, select View DTCs. Is the DTC Active at this time? Yes Go To 2 . No Go To 14 .
2. (K855) 5-VOLT SUPPLY CIRCUIT Turn the ignition off. Disconnect the CKP Sensor harness connector. Ignition on, engine not running. Measure the voltage on the (K855) 5-volt Supply circuit in the CKP Sensor harness connector. Is the voltage between 4.5 and 5.2 volts? Yes Go To 3 . No Go To 10 .
3. (K24) CKP SIGNAL CIRCUIT Measure the voltage on the (K24) CKP Signal circuit in the CKP Sensor harness connector. NOTE: The sensor voltage should be approximately 5.0 volts (plus or minus.1 volt) with the connector disconnected. Does the scan tool display the voltage as described above? Yes Go To 4 . No Go To 7 .
4. (K900) SENSOR GROUND 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 (K900) Sensor ground circuit from the CKP Sensor 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 (K900) Sensor ground circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .
5. (K24) CKP SIGNAL CIRCUIT SHORTED TO THE (K855) 5-VOLT SUPPLY CIRCUIT Measure the resistance between the (K24) CKP Signal circuit and the (K855) 5-volt Supply circuit in the CKP Sensor harness connector. Is the resistance below 5.0 ohms? Yes Repair the short between the (K24) CKP Signal circuit and the (K855) 5-volt Supply circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 6 .
6. CRANKSHAFT POSITION SENSOR NOTE: Inspect the slots on the flywheel for damage. If a problem is found repair as necessary. Verify that there is good pin to terminal contact in the Crank Position Sensor and Powertrain Control Module connectors. If there are no possible causes remaining, view repair. Repair If no problems were found in the connectors, replace the Crankshaft Position Sensor. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .
7. (K24) CKP 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 (K24) CKP Signal circuit in the CKP Sensor harness connector. Is there any voltage present? Yes Repair the short to voltage in the (K24) CKP Signal circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 8 .
8. (K24) CKP 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 (K24) CKP Signal circuit from the CKP 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 (K24) CKP Signal circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .
9. (K24) CKP SIGNAL CIRCUIT SHORTED TO GROUND Measure the resistance between ground and the (K24) CKP Signal circuit in the CKP Sensor harness connector. Is the resistance below 5.0 ohms? Yes Repair the short to ground in the (K24) CKP Signal circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 13 .
10. (K855) 5-VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE Turn the ignition off. Disconnect the C2 PCM harness connector. Ignition on, engine not running. Measure the voltage on the (K855) 5-volt Supply circuit in the CKP Sensor harness connector. Is there any voltage present? Yes Repair the short to voltage in the (K855) 5-volt Supply circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 11 .
11. (K855) 5-VOLT SUPPLY 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 (K855) 5-volt Supply circuit from the CKP 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 open in the (K855) 5-volt Supply circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .
12. (K855) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND Measure the resistance between ground and the (K855) 5-volt Supply circuit in the CKP Sensor harness connector. Is the resistance below 100 ohms? Yes Repair the short to ground in the (K855) 5-volt Supply circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 13 .
13. POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the related 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 related Sensor 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-306217-S13377649292008120900000) . No Replace and program the Powertrain Control Module per Service Information. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .
14. ERRATIC CKP SENSOR SIGNAL Turn the ignition off. With a lab scope probe and the Miller special tool #6801, backprobe the (K24) CKP Signal circuit in the CKP harness connector. 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. Wiggle the related wire harness and lightly tap on the Crank Position Sensor. Observe the lab scope screen. Look for any pulses generated by the CKP Sensor. Allow the engine to idle. Observe the lab scope screen. Did the CKP Sensor generate any erratic pulses? Yes Verify that there is good pin to terminal contact in the Crank Position Sensor and Powertrain Control Module connectors. Replace the Crank Position Sensor if no problems were found with the connectors. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 15 .
15. ERRATIC CMP SIGNAL Turn the ignition off. With a lab scope probe and the Miller special tool #6801, backprobe the (K44) CMP Signal circuit in the CMP harness connector. 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. Wiggle the related wire harness and lightly tap on the Cam Position Sensor. Observe the lab scope screen. Look for any pulses generated by the CMP Sensor. Allow the engine to idle. Observe the lab scope screen. Did the CMP Sensor generate any pulses? Yes Verify that there is good pin to terminal contact in the CMP Sensor and Powertrain Control Module connectors. Replace the Camshaft Position Sensor if no problems were found with the connectors. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No The conditions that originally set this DTC are no longer present. Refer to the «INTERMITTENT CONDITION»(ref-306207-S19641665412008120900000) Diagnostic Procedure for further assistance.

1. When Monitored: During engine cranking and with the engine running. Battery voltage greater than 10 volts.

1. Set Condition: When the CKP Sensor failure counter reaches 20. One Trip Fault. Three good trips to turn off the MIL.

Always perform the PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE before proceeding.

1. When Monitored: During engine cranking and with the engine running. Battery voltage greater than 10 volts.

1. Set Condition: At least 5 seconds or 2.5 engine revolutions have elapsed with crankshaft position sensor signals present but no camshaft position sensor signal. One Trip Fault. Three good trips to turn off the MIL.

Always perform the PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE before proceeding.

Scheme 179

Scheme 180

Scheme 181

Scheme 182

Scheme 183

Scheme 184

Scheme 185

Scheme 186

1. ACTIVE DTC Turn the ignition on. With the scan tool, select View DTCs. Copy DTC and Freeze Frame information. 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. NOTE: Attempt to operate the vehicle under conditions similar to which the DTC was set. NOTE: It may be necessary to test drive the vehicle within the DTC monitoring conditions in order for this DTC to set. With a scan tool, select View DTCs. Is the DTC Active at this time? Yes Go To 2 . No Go To 14 .
2. (K857) 5-VOLT SUPPLY CIRCUIT Turn the ignition off. Disconnect the CMP Sensor harness connector. Ignition on, engine not running. Measure the voltage on the (K857) 5-volt Supply circuit in the CMP Sensor harness connector. Is the voltage between 4.5 and 5.2 volts? Yes Go To 3 . No Go To 10 .
3. (K44) CMP SIGNAL CIRCUIT Measure the voltage on the (K44) CMP Signal circuit in the CMP Sensor harness connector. Is the voltage between 4.5 and 5.0 volts? Yes Go To 4 . No Go To 7 .
4. (K900) SENSOR GROUND CIRCUIT OPEN Turn the ignition off. Disconnect the C1 and 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 (K900) Sensor ground circuit from the CMP Sensor 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 (K900) Sensor ground circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .
5. (K44) CMP SIGNAL SHORTED TO THE (K857) 5-VOLT SUPPLY CIRCUIT Measure the resistance between the (K44) CMP Signal circuit and the (K857) 5-volt Supply circuit in the CMP Sensor harness connector. Is the resistance below 5.0 ohms? Yes Repair the short between the (K44) CMP Signal circuit and the (K857) 5-volt Supply circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 6 .
6. CAMSHAFT POSITION SENSOR NOTE: Inspect the Camshaft sprocket for damage per the Service Information. If a problem is found repair as necessary. Verify that there is good pin to terminal contact in the CKP Sensor and the Powertrain Control Module connectors. If there are no possible causes remaining, view repair. Repair If no problems were found in the connectors, replace the Camshaft Position Sensor. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .
7. (K44) CMP 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 (K44) CMP Signal circuit in the CMP Sensor harness connector. Is there any voltage present? Yes Repair the short to voltage in the (K44) CMP Signal circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 8 .
8. (K44) CMP 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 (K44) CMP Signal circuit from the CMP 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 (K44) CMP Signal circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .
9. (K44) CMP SIGNAL CIRCUIT SHORTED TO GROUND Measure the resistance between ground and the (K44) CMP Signal circuit in the CMP Sensor harness connector. Is the resistance below 100 ohms? Yes Repair the short to ground in the (K44) CMP Signal circuit Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 10 .
10. (K857) 5-VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE Turn the ignition off. Disconnect the C1 PCM harness connector. Ignition on, engine not running. Measure the voltage on the (K857) 5-volt Supply circuit in the CMP Sensor harness connector. Is there any voltage present? Yes Repair the short to voltage in the (K857) 5-volt Supply circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 11 .
11. (K857) 5-VOLT SUPPLY 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 (K857) 5-volt Supply circuit between the CMP 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 open in the (K857) 5-volt Supply circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .
12. (K857) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND Measure the resistance between ground and the (K857) 5-volt Supply circuit in the CMP Sensor harness connector. Is the resistance below 100 ohms? Yes Repair the short to ground in the (K857) 5-volt Supply circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 13 .
13. POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the related 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 related Sensor 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-306217-S13377649292008120900000) . No Replace and program the Powertrain Control Module per Service Information. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .
14. ERRATIC CMP SIGNAL With a lab scope probe and the Miller special tool #6801, back probe the (K44) CMP Signal circuit in the CMP harness connector. 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. Wiggle the related wire harness and lightly tap the Camshaft Position Sensor. Observe the lab scope screen. Allow the engine to idle. Observe the lab scope screen. Did the CMP Sensor generate any erratic pulses? Yes Verify that there is good pin to terminal contact in the CMP Sensor and the Powertrain Control Module connectors. If OK, replace the Camshaft Position Sensor. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 15 .
15. ERRATIC CKP SIGNAL Turn the ignition off. With a lab scope probe and the Miller special tool #6801, backprobe the (K24) CKP Signal circuit in the CKP harness connector. 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. Wiggle the related wire harness and lightly tap on the Crankshaft Position Sensor. Observe the lab scope screen. Allow the engine to idle. Observe the lab scope screen. Did the CKP Sensor generate any erratic pulses? Yes Verify that there is good pin to terminal contact in the CKP Sensor and the Powertrain Control Module connectors. If OK, replace the Crankshaft Position Sensor. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No The condition that originally set this DTC is no longer present. Refer to the «INTERMITTENT CONDITION»(ref-306207-S19641665412008120900000) Diagnostic Procedure for further assistance.

1. When Monitored: While cranking the engine and engine running.

1. Set Condition: When the failure counter reaches 20. One Trip Fault. Three good trips to turn off the MIL.

Always perform the PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE before proceeding.

1. When Monitored: Engine running for greater than two minutes with the Engine Coolant Temp greater than 70° C (158° F). EGR active. Less than 8500 feet. Ambient temperature greater than -6° C (20° F).

1. Set Condition: The PCM closes the EGR valve while monitoring the O2 Sensor signal. Once a closed EGR fueling sample has been established the PCM then ramps in EGR and additional fueling while monitoring the O2 sensor signal in the open state. A fueling sample is again established. The PCM then compares the different O2 Sensor signal readings (fueling samples). If a larger than expected variation is detected, a soft failure is recorded. Three soft failures set a one trip failure. After two failed trips, a DTC is set and the MIL is illuminated.

Always perform the PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE before proceeding.

Scheme 187

Scheme 188

1. ACTIVE DTC NOTE: Diagnose and repair any EGR circuit DTCs before continuing with this procedure. Turn the ignition on. With the scan tool, select View DTCs. Copy DTC and Freeze Frame information. 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. NOTE: Attempt to operate the vehicle under conditions similar to which the DTC was set. NOTE: It may be necessary to test drive the vehicle within the DTC monitoring conditions in order for this DTC to set. With a scan tool, select View DTCs. Is the DTC Active or Pending at this time? Yes Go To 2 . No Refer to the «INTERMITTENT CONDITION»(ref-306207-S19641665412008120900000) Diagnostic Procedure.
2. ROUGH IDLE OR STALLING AT IDLE Turn the ignition off. Turn all accessories off. Start the engine. 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. Does the engine run rough or stall at idle? Yes Go To 3 . No Go To 5 .
3. EGR VALVE ASSEMBLY CONTROL CIRCUIT Turn the ignition off. Disconnect the EGR Valve Assembly harness connector. Start the engine. 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. Does the engine continue to run rough or stall with the EGR Valve Assembly connector disconnected? Yes Go To 8 . No Go To 4 .
4. (K35) EGR SOLENOID CONTROL CIRCUIT SHORTED TO VOLTAGE Turn the ignition off. Disconnect the C1 and C2 PCM harness connectors. Disconnect the EGR Solenoid harness connector. Ignition on, engine not running. Measure the voltage on the (K35) EGR Solenoid Control circuit in the EGR Solenoid connector. Is there any voltage present? Yes Repair the short to voltage in the (K35) EGR Solenoid Control circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 9 .
5. EGR SYSTEM TEST Turn all accessories off. 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, perform the EGR System Test. Select OPEN to open the EGR valve. Did the engine run rough or stall when the valve was opened during the system test? Yes Go To 8 . No Go To 6 .
6. (Z904) EGR SOLENOID GROUND CIRCUIT OPEN Turn the ignition off. Using a 12-volt test light connected to battery voltage, probe the (Z904) EGR Solenoid ground circuit in the EGR Solenoid harness connector. Does the 12-volt test light illuminate brightly? Yes Go To 7 . No Repair the open in the (Z904) EGR Solenoid ground circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .
7. (K35) EGR CONTROL CIRCUIT HIGH RESISTANCE Turn the ignition off. Connect the EGR Valve Assembly 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 along with the #8815-1 to perform the diagnosis. Using a voltmeter, perform a voltage drop test by backprobing the (K35) EGR Control circuit at the EGR Valve Assembly harness connector and probing the appropriate terminal of the special tool #8815. Make sure the voltmeter leads are connected so that positive polarity is displayed on the voltmeter. 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, perform the EGR System Test. Select OPEN to open the EGR valve. Monitor the circuit voltage on the voltmeter. Is the voltage below 0.5 volts when the valve was opened during the system test? Yes Go To 8 . No Repair the (K35) EGR Control circuit for excessive resistance. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .
8. EGR VALVE ASSEMBLY WARNING: The normal operating temperature of the EGR system is very high. Never work around or attempt to service any part of the EGR system until it has cooled. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the EGR Valve Assembly 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. Refer to any Technical Service Bulletins that may apply. Inspect the EGR Valve Assembly for the following: - Proper mounting, leaking gasket(s) - Damaged, leaking, or obstructed EGR tube(s) - Carbon build up on or near the EGR pintle or within passages. Were any problem found? Yes Repair or replace the EGR system components as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Replace the EGR Valve Assembly. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .
9. POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the EGR Solenoid Assembly 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 Solenoid 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-306217-S13377649292008120900000) . No Replace and program the Powertrain Control Module per Service Information. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .

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

1. Set Condition: The EGR solenoid control circuit is not in the expected state when requested to operate by the PCM. One Trip Fault.

Always perform the PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE before proceeding.

Scheme 189

Scheme 190

1. DTC IS ACTIVE Turn the ignition on. With the scan tool, Clear DTCs in the Powertrain Control Module (PCM). With the scan tool, actuate the EGR Valve Solenoid Duty Cycle to 79.9%. With the scan tool, select View DTCs. Is the DTC Active at this time? Yes Go to 2 . No Refer to the «INTERMITTENT CONDITION»(ref-306207-S19641665412008120900000) Diagnostic Procedure.
2. (K35) EGR CONTROL CIRCUIT SHORTED TO VOLTAGE Turn the ignition off. Disconnect the EGR Valve Assembly connector. Disconnect the C2 PCM harness connector. Turn the ignition on. Measure the voltage of the (K35) EGR Control circuit in the EGR Valve Assembly harness connector. Is there any voltage present? Yes Repair the short to voltage in the (K35) EGR Control circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go to 3 .
3. (K35) EGR CONTROL CIRCUIT SHORTED TO GROUND Turn the ignition off. Measure the resistance between ground and the (K35) EGR Control circuit in the EGR Valve Assembly harness connector. Is the resistance above 100 ohms? Yes Go to 4 . No Repair the short to ground in the (K35) EGR Control circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .
4. (K35) EGR CONTROL CIRCUIT OPEN OR HIGH RESISTANCE 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 (K35) EGR Control circuit between the EGR Valve Assembly harness connector and the appropriate terminal of special tool #8815. Is the resistance below 5.0 ohms? Yes Go to 5 . No Repair the excessive resistance in the (K35) EGR Control circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .
5. (Z904) GROUND CIRCUIT OPEN OR HIGH RESISTANCE Using a 12 volt test light connected to 12 volts, check the (Z904) Ground circuit in the EGR Valve Assembly harness connector. NOTE: The test light should be illuminated and bright. Compare the brightness to that of a direct connection to the battery. Is the test light illuminated and bright? Yes Go to 6 . No Repair the (Z904) Ground circuit for an open circuit or high resistance. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .
6. EGR VALVE ASSEMBLY Connect the C2 PCM harness connector. Turn the ignition on. With the scan tool, actuate the EGR Valve Solenoid Duty Cycle. Select the Duty Cycle reading of 79.9% Using a 12 volt test light connected to ground, check the (K35) EGR Control circuit in the EGR Valve Assembly harness connector. NOTE: If the DTC is active, the actuation test may not be allowed by the PCM. If may be necessary to clear the DTCs before starting the actuation. NOTE: The voltage supplied to the solenoid circuit during the actuation may be less than battery voltage. The test light should be illuminated, but may not be as bright as a direct connection to the battery. 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. Is the test light illuminated during the actuation? Yes Verify that there is good pin to terminal contact in the Solenoid and the Powertrain Control Module connectors. If OK, replace the EGR Valve Assembly in accordance with the Service Information. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go to 7 .
7. POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the EGR Solenoid Assembly 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 Solenoid 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-306217-S13377649292008120900000) . No Replace and program the Powertrain Control Module (PCM) in accordance with the Service Information. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .

1. When Monitored: Engine running.

1. Set Condition: The EGR flow or valve movement is not what is expected. A rationality error has been detected fro the EGR Close Position Performance. Two trip fault.

Always perform the PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE before proceeding.

Scheme 191

1. ACTIVE DTC NOTE: Diagnose and repair any EGR signal circuit high or low DTCs before continuing with this procedure. Turn the ignition on. With the scan tool, select View DTCs. Record DTC and Freeze Frame information. 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. WARNING: The normal operating temperature of the EGR system is very high. Never work around or attempt to service any part of the EGR system until it has cooled. NOTE: Attempt to operate the vehicle under conditions similar to which the DTC was set. NOTE: It may be necessary to test drive the vehicle within the DTC monitoring conditions in order for this DTC to set. With a scan tool, select View DTCs. Is the DTC Active or Pending at this time? Yes Go To 2 . No Refer to the «INTERMITTENT CONDITION»(ref-306207-S19641665412008120900000) Diagnostic Procedure.
2. (K857) 5 VOLT SUPPLY CIRCUIT HIGH RESISTANCE 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 along with the #8815-1 to perform the diagnosis. Using a voltmeter, perform a voltage drop test by backprobing the (K857) 5 Volt Supply circuit at the EGR Valve Assembly harness connector and probing the appropriate terminal of the special tool #8815. Make sure the voltmeter leads are connected so that positive polarity is displayed on the voltmeter. 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. Start the engine. Is the voltage below 0.5 volts? Yes Go To 3 . No Repair the excessive resistance in the (K857) 5 Volt Supply circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .
3. (K34) EGR SIGNAL CIRCUIT HIGH RESISTANCE 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 along with the #8815-1 to perform the diagnosis. Using a voltmeter, perform a voltage drop test by backprobing the (K34) EGR Signal circuit at the EGR Valve Assembly harness connector and probing the appropriate terminal of the special tool #8815. Make sure the voltmeter leads are connected so that positive polarity is displayed on the voltmeter. 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. Start the engine. Is the voltage below 0.5 volts? Yes Go To 4 . No Repair the excessive resistance in the (K34) EGR Signal circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .
4. (K900) SENSOR GROUND CIRCUIT HIGH RESISTANCE 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 along with the #8815-1 to perform the diagnosis. Using a voltmeter, perform a voltage drop test by backprobing the (K900) Sensor Ground circuit at the EGR Valve Assembly harness connector and probing the appropriate terminal of the special tool #8815. Make sure the voltmeter leads are connected so that positive polarity is displayed on the voltmeter. 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. Start the engine. Is the voltage below 0.5 volts? Yes Go To 5 . No Repair the excessive resistance in the (K900) Sensor Ground circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .
5. (Z904) GROUND CIRCUIT OPEN OR HIGH RESISTANCE Turn the ignition off. Disconnect the EGR Valve Assembly harness connector. Using a 12 volt test light connected to the 12 volts, check the (Z904) Ground circuit in the EGR Valve Assembly harness connector. NOTE: The test light should be illuminated and bright. Compare the brightness to that of a direct connection to the battery. Is the test light illuminated and bright? Yes Go To 6 . No Repair the excessive resistance in the (Z904) Ground circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .
6. (K35) EGR CONTROL CIRCUIT HIGH RESISTANCE Turn the ignition off. Connect the EGR Valve Assembly 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 along with the #8815-1 to perform the diagnosis. Using a voltmeter, perform a voltage drop test by backprobing the (K35) EGR Control circuit at the EGR Valve Assembly harness connector and probing the appropriate terminal of the special tool #8815. Make sure the voltmeter leads are connected so that positive polarity is displayed on the voltmeter. 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, perform the EGR System Test. Select OPEN to open the EGR valve. Monitor the circuit voltage on the voltmeter. Is the voltage below 0.5 volts when the valve was opened during the system test? Yes Go To 7 . No Repair the excessive resistance in the (K35) EGR Control circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .
7. EGR VALVE ASSEMBLY Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the EGR Valve Assembly 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 Solenoid and the Powertrain Control Module connectors. Refer to any Technical Service Bulletins that may apply. Were any problems found? Yes Repair or replace the EGR system components as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Replace the EGR Valve Assembly. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .

1. When Monitored: With the ignition on. Battery voltage above 10.0 volts.

1. Set Condition: EGR Position Sensor Signal is less than the minimum acceptable value. One trip Fault.

Always perform the PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE before proceeding.

Scheme 192

Scheme 193

Scheme 194

Scheme 195

Scheme 196

Scheme 197

1. ACTIVE DTC Turn the ignition on. With the scan tool, select View DTCs. Record DTC and Freeze Frame information. 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. WARNING: The normal operating temperature of the EGR system is very high. Never work around or attempt to service any part of the EGR system until it has cooled. NOTE: Attempt to operate the vehicle under conditions similar to which the DTC was set. NOTE: It may be necessary to test drive the vehicle within the DTC monitoring conditions in order for this DTC to set. With a scan tool, select View DTCs. Is the DTC Active at this time? Yes Go To 2 . No Refer to the «INTERMITTENT CONDITION»(ref-306207-S19641665412008120900000) Diagnostic Procedure.
2. (K857) 5-VOLT SUPPLY CIRCUIT Turn the ignition off. Disconnect the EGR Solenoid harness connector. Ignition on, engine not running. Measure the voltage of the (K857) 5-volt Supply circuit in the EGR Solenoid harness connector. Is the voltage between 4.5 to 5.2 volts? Yes Go To 3 . No Go To 7 .
3. (K34) EGR POSITION SENSOR SIGNAL CIRCUIT SHORTED TO GROUND Turn the ignition off. Disconnect the C2 PCM harness connector. Measure the resistance between ground and the (K34) EGR Position Sensor Signal circuit in the EGR Solenoid harness connector. Is the resistance below 100 ohms? Yes Repair the short to ground circuit in the (K34) EGR Position Sensor Signal circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 4 .
4. (K34) EGR SENSOR SIGNAL CIRCUIT SHORTED TO THE (K900) SENSOR GROUND CIRCUIT Measure the resistance between the (K34) EGR Position Sensor Signal circuit and (K900) Sensor ground circuit in the EGR Solenoid harness connector. Is the resistance below 100 ohms? Yes Repair the short between the (K900) Sensor ground and the (K34) EGR Position Sensor Signal circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 5 .
5. EXCESSIVE RESISTANCE IN THE (K34) EGR SIGNAL 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 (K34) EGR Signal circuit between the Exhaust Gas Recirculation Valve harness connector and 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 (K34) EGR Signal circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .
6. EXHAUST GAS RECIRCULATION VALVE Turn the ignition off. Connect the C2 PCM harness connector. Turn the ignition on. With the scan tool, read the Exhaust Gas Recirculation Valve signal voltage. NOTE: The sensor voltage should be approximately 5.0 volts (plus or minus.1 volt) with the connector disconnected. Does the scan tool display the voltage as described above? Yes Verify that there is good pin to terminal contact in the Solenoid and the Powertrain Control Module connectors. If OK, replace the EGR Valve Assembly in accordance with the Service Information. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 9 .
7. (K857) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND Turn the ignition off. Disconnect the C1 PCM harness connector. Measure the resistance between ground and the (K857) 5-volt Supply circuit in the EGR Solenoid harness connector. Is the resistance below 100 ohms? Yes Repair the short to ground in the (K857) 5-volt Supply circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 8 .
8. (K857) 5-VOLT SUPPLY 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 (K857) 5-volt Supply circuit from the EGR Solenoid 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 (K857) 5-volt Supply circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .
9. POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the EGR Solenoid Assembly 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 Solenoid 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-306217-S13377649292008120900000) . No Replace and program the Powertrain Control Module per Service Information. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .

1. When Monitored: With the ignition on. Battery voltage greater than 10 volts.

1. Set Condition: EGR position sensor signal is greater than the maximum acceptable value. One trip Fault.

Always perform the PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE before proceeding.

Scheme 198

Scheme 199

Scheme 200

1. ACTIVE DTC Turn the ignition on. With the scan tool, select View DTCs. Record DTC and Freeze Frame information. 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. WARNING: The normal operating temperature of the EGR system is very high. Never work around or attempt to service any part of the EGR system until it has cooled. NOTE: Attempt to operate the vehicle under conditions similar to which the DTC was set. NOTE: It may be necessary to test drive the vehicle within the DTC monitoring conditions in order for this DTC to set. With a scan tool, select View DTCs. Is the DTC Active at this time? Yes Go To 2 . No Refer to the «INTERMITTENT CONDITION»(ref-306207-S19641665412008120900000) Diagnostic Procedure.
2. (K34) EGR POSITION SENSOR SIGNAL CIRCUIT SHORTED TO THE (K857) 5-VOLT SUPPLY CIRCUIT Turn the ignition off. Disconnect the EGR Solenoid harness connector. Disconnect the C1 and C2 PCM harness connectors. Measure the resistance between the (K34) EGR Position Sensor Signal circuit and the (K857) 5-volt Supply circuit in the EGR Solenoid harness connector. Is the resistance below 100 ohms? Yes Repair the short between the (K34) EGR Position Sensor Signal circuit and the (K857) 5-volt Supply circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 3 .
3. (K34) EGR POSITION SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE Ignition on, engine not running. Measure the voltage on the (K34) EGR Sensor Signal circuit in the EGR Solenoid harness connector. Is there any voltage present? Yes Repair the short to voltage in the (K34) EGR Position Sensor Signal circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 4 .
4. EGR SOLENOID ASSEMBLY Turn the ignition off. Connect the PCM harness connectors. Ignition on, engine not running. With the scan tool, monitor the EGR Position Sensor voltage. Connect a jumper wire between the (K34) EGR Position Sensor Signal circuit and the (K900) Sensor ground circuit. NOTE: The sensor voltage should be approximately 0.0 volts (plus or minus.1 volt) with the jumper wire in place. Does the scan tool display the voltage as described above? Yes Verify that there is good pin to terminal contact in the Solenoid and the Powertrain Control Module connectors. If OK, replace the EGR Valve Assembly in accordance with the Service Information. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To 5 . NOTE: Remove the jumper wire before continuing.
5. (K34) EGR POSITION SENSOR SIGNAL 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 (K34) EGR Position Sensor Signal circuit from the EGR Solenoid 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 (K34) EGR Position Sensor Signal circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .
6. (K900) SENSOR GROUND CIRCUIT OPEN Measure the resistance of the (K900) Sensor ground circuit from the EGR Solenoid harness connector to the appropriate terminal of special tool #8815. Is the resistance below 30 ohms? Yes Go To 7 . No Repair the open in the (K900) Sensor ground circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .
7. POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the EGR Solenoid Assembly 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 Solenoid 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-306217-S13377649292008120900000) . No Replace and program the Powertrain Control Module per Service Information. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .