Ngc Engine - Dtcs P0205 to P0404: Other Dodge Dakota III рестайлинг

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. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .

Scheme 106

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Scheme 109

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 may result in possible serious or fatal injury. 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 step 2 No Refer to the INTERMITTENT CONDITION Diagnostic Procedure. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000)
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 PCM Pinout Box 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)
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. Look for broken, bent, pushed out or corroded terminals. Were any problems found? Yes Repair as necessary. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 4
4. (A955) ASD RELAY OUTPUT CIRCUIT OPEN OR SHORT TO GROUND 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 (A955) 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 step 5 No. Repair the excessive resistance or short to ground in the (A955) ASD Relay Output circuit. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
5. (K38) INJECTOR CONTROL NO. 5 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 PCM Pinout Box 8815 to perform diagnosis. Measure the resistance of the (K38) Injector Control No. 5 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 step 6 No Repair the open in the (K38) Injector Control No. 5 circuit. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
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 Fuel Injector and Powertrain Control Module connectors. Refer to any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Replace the Fuel Injector 5 in accordance with the Service Information. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
7. (K38) INJECTOR CONTROL NO. 5 CIRCUIT SHORTED TO GROUND Turn the ignition off. Disconnect the C2 PCM harness connector. Measure the resistance between ground and the (K38) Injector Control No. 5 circuit in the Injector harness connector. Is the resistance below 100 ohms? Yes Repair the short to ground in the (K38) Injector Control No. 5 circuit. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 8
8. POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Fuel 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 Fuel Injector and Powertrain Control Module connectors. Refer to any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Replace and program the Powertrain Control Module per Service Information. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .

Scheme 110

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. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .

Scheme 111

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Scheme 114

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 may result in possible serious or fatal injury. 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 step 2 No Refer to the INTERMITTENT CONDITION Diagnostic Procedure. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000)
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 PCM Pinout Box 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)
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. Look for broken, bent, pushed out or corroded terminals. Were any problems found? Yes Repair as necessary. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 4
4. (A955) ASD RELAY OUTPUT CIRCUIT OPEN OR SHORT TO GROUND 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 (A955) 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 step 5 No. Repair the excessive resistance or short to ground in the (A955) ASD Relay Output circuit. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
5. (K58) INJECTOR CONTROL NO. 6 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 the PCM Pinout Box 8815 to perform diagnosis. Measure the resistance of the (K58) Injector Control No. 6 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 step 6 No Repair the open in the (K58) Injector Control No. 6 circuit. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
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 Fuel Injector and Powertrain Control Module connectors. Refer to any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Replace the Fuel Injector 6 in accordance with the Service Information. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
7. (K58) INJECTOR CONTROL NO. 6 CIRCUIT SHORTED TO GROUND Turn the ignition off. Disconnect the C2 PCM harness connector. Measure the resistance between ground and the (K58) Injector Control No. 6 circuit in the Injector harness connector. Is the resistance below 100 ohms? Yes Repair the short to ground in the (K58) Injector Control No. 6 circuit. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 8
8. POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Fuel 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 Fuel Injector and Powertrain Control Module connectors. Refer to any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Replace and program the Powertrain Control Module per Service Information. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .

Scheme 115

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. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .

Scheme 116

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Scheme 118

Scheme 119

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 may result in possible serious or fatal injury. 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 step 2 No Refer to the INTERMITTENT CONDITION Diagnostic Procedure. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000)
2. FUEL INJECTOR 7 CIRCUIT RESISTANCE Turn the ignition off. Disconnect the C1 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 PCM Pinout Box 8815 to perform diagnosis. Measure the resistance of the Fuel Injector 7 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)
3. FUEL INJECTOR 7 WIRING AND CONNECTOR INSPECTION Turn the ignition off. Verify that the Fuel Injector 7 is properly connected to the injector. Disconnect the Fuel Injector 7 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 7 wiring and connector. Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Were any problems found? Yes Repair as necessary. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 4
4. (A955) ASD RELAY OUTPUT CIRCUIT OPEN OR SHORTED TO GROUND 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 (A955) ASD Relay Output circuit in the Fuel Injector 7 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 step 5 No. Repair the excessive resistance or short to ground in the (A955) ASD Relay Output circuit. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
5. (K26) INJECTOR CONTROL NO. 7 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 the PCM Pinout Box 8815 to perform diagnosis. Measure the resistance of the (K26) Injector Control No. 7 circuit from the Fuel Injector harness connector to the appropriate terminal of special tool #8815. Is the resistance below 7.0 ohms? Yes Go to step 6 No Repair the open in the (K26) Injector Control No. 7 circuit. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
6. FUEL INJECTOR 7 Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Fuel Injector 7 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 Fuel Injector and Powertrain Control Module connectors. Refer to any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Replace the Fuel Injector 7 in accordance with the Service Information. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
7. (K26) INJECTOR CONTROL NO. 7 CIRCUIT SHORTED TO GROUND Turn the ignition off. Disconnect the C1 PCM harness connector. Measure the resistance between ground and the (K26) Injector Control No. 7 circuit in the Injector harness connector. Is the resistance below 100 ohms? Yes Repair the short to ground in the (K26) Injector Control No. 7 circuit. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 8
8. POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Fuel 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 Fuel Injector and Powertrain Control Module connectors. Refer to any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Replace and program the Powertrain Control Module per Service Information. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .

Scheme 120

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. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .

Scheme 121

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 may result in possible serious or fatal injury. 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 step 2 No Refer to the INTERMITTENT CONDITION Diagnostic Procedure. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000)
2. FUEL INJECTOR 8 CIRCUIT RESISTANCE Turn the ignition off. Disconnect the C1 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 PCM Pinout Box 8815 to perform diagnosis. Measure the resistance of the Fuel Injector 8 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)
3. FUEL INJECTOR 8 WIRING AND CONNECTOR INSPECTION Turn the ignition off. Verify that the Fuel Injector 8 is properly connected to the injector. Disconnect the Fuel Injector 8 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 8 wiring and connector. Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Were any problems found? Yes Repair as necessary. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 4
4. (A955) ASD RELAY OUTPUT CIRCUIT OPEN OR SHORTED TO GROUND 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 (A955) ASD Relay Output circuit in the Fuel Injector 8 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 step 5 No. Repair the excessive resistance or short to ground in the (A955) ASD Relay Output circuit. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
5. (K28) INJECTOR CONTROL NO. 8 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 the PCM Pinout Box 8815 to perform diagnosis. Measure the resistance of the (K28) Injector Control No. 8 circuit from the Fuel Injector harness connector to the appropriate terminal of special tool #8815. Is the resistance below 8.0 ohms? Yes Go to step 6 No Repair the open in the (K28) Injector Control No. 8 circuit. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
6. FUEL INJECTOR 8 Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Fuel Injector 8 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 Fuel Injector and Powertrain Control Module connectors. Refer to any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Replace the Fuel Injector 8 in accordance with the Service Information. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
7. (K28) INJECTOR CONTROL NO. 8 CIRCUIT SHORTED TO GROUND Turn the ignition off. Disconnect the C1 PCM harness connector. Measure the resistance between ground and the (K28) Injector Control No. 8 circuit in the Injector harness connector. Is the resistance below 100 ohms? Yes Repair the short to ground in the (K28) Injector Control No. 8 circuit. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 8
8. POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Fuel 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 Fuel Injector and Powertrain Control Module connectors. Refer to any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Replace and program the Powertrain Control Module per Service Information. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .

Scheme 124

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

1. Set Condition: The PCM detects that the sensor input voltage does not fall within a valid range based on engine speed and load. Two Trip Fault. ETC light will illuminate. P2135 should set with this code also.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .

Scheme 125

Scheme 126

Scheme 127

1. ACTIVE DTC 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 step 2 No Go to step 9
2. EXCESSIVE RESISTANCE IN THE (K122) TP SENSOR NO. 2 SIGNAL CIRCUIT Turn the ignition off. Disconnect the C2 PCM harness connector. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install PCM Pinout Box 8815 along with the Adapter 8815-1 to perform the diagnosis. Using a voltmeter perform a voltage drop test. Backprobe the (K122) TP Sensor No. 2 Signal circuit at the Throttle Body harness connector and probe the appropriate terminal of the PCM Pinout Box 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 may result in possible serious or fatal injury. 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 step 3 No Repair the excessive resistance in the (K122) TP Sensor No. 2 Signal circuit. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
3. EXCESSIVE RESISTANCE IN THE (K22) TP SENSOR NO. 1 SIGNAL CIRCUIT Turn the ignition off. Move the voltmeter leads to backprobe the (K22) TP Sensor No. 1 Signal circuit at the Throttle Body harness connector and to probe the appropriate terminal of the PCM Pinout Box 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 may result in possible serious or fatal injury. 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 step 4 No Repair the excessive resistance in the (K22) TP Sensor No. 1 Signal circuit. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
4. EXCESSIVE RESISTANCE IN THE (F855) 5-VOLT SUPPLY CIRCUIT Turn the ignition off. Move the voltmeter leads to backprobe the (F855) 5-volt Supply circuit at the Throttle Body harness connector and to probe the appropriate terminal of the PCM Pinout Box 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 may result in possible serious or fatal injury. 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 step 5 No Repair the excessive resistance in the (F855) 5-volt Supply circuit. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000)
5. EXCESSIVE RESISTANCE IN THE (K922) TP SENSOR RETURN CIRCUIT Turn the ignition off. Move the voltmeter leads to backprobe the (K922) TP Sensor Return circuit at the Throttle Body harness connector and to probe the appropriate terminal of the PCM Pinout Box 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 may result in possible serious or fatal injury. 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 step 6 No Repair the excessive resistance in the (K922) TP Sensor Return circuit. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
6. (K22) TP SENSOR NO. 1 SIGNAL SHORTED TO THE (K122) TP SENSOR NO. 2 SIGNAL Turn the ignition off. Remove PCM Pinout Box 8815 and Adapter 8815-1, leaving the C2 PCM harness connector disconnected. Disconnect the Throttle Body harness connector. Measure the resistance between the (K22) TP Sensor No. 1 Signal circuit and the (K122) TP Sensor No. 2 Signal circuit at the Throttle Body harness connector. Is the resistance below 5.0 Ohms? Yes Repair the short between the (K122) TP Sensor No. 2 Signal circuit and the (K22) TP Sensor No. 1 Signal circuit. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 7
7. THROTTLE POSITION SENSOR Connect the C2 PCM harness connector. Ignition on, engine not running. With the scan tool, monitor the TP Sensor No. 1 and No. 2 voltage. Connect a jumper wire between (F855) 5-volt supply circuit and the (K122) TP Sensor No. 2 Signal circuit. NOTE: TP Sensor No. 2 voltage should change from approximately 0 volts to 5.0 volts. Connect a jumper wire between the (K922) TP Sensor Return circuit and the (K22) TP Sensor No. 1 Signal circuit. NOTE: TP Sensor No. 1 voltage should change from approximately 4.7 volts to 0.3 of a volt. Is the voltage reading within the listed specification with the jumper wire installed for either circuit? Yes Verify that there is good pin to terminal contact in the Throttle Body and Powertrain Control Module connectors. Disconnect the Battery when replacing the Throttle Body Assembly. Replace the Throttle Body Assembly if no problems were found in the connectors. After installation is complete, using a scan tool, select the ETC RELEARN function. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 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. Perform any Technical Service Bulletins that may apply. Were there any problems found? Yes Repair as necessary. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Replace and program the Powertrain Control Module in accordance with the Service Information. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
9. THROTTLE FOLLOWER TEST Ignition on, engine not running. With the scan tool, perform the ETC Throttle Follower Test and monitor the TP Sensor No. 1 or No. 2 voltage. Slowly press the throttle pedal down. The voltage for TP Sensor No. 1 should start at approximately 0.7 of a volt and increase to approximately 4.3 volts. The voltage for TP Sensor No. 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 Perform the INTERMITTENT CONDITION diagnostic procedure. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Verify that there is good pin to terminal contact in the Throttle Body and Powertrain Control Module connectors. Disconnect the Battery when replacing the Throttle Body Assembly. Replace the Throttle Body Assembly if no problems were found in the connectors. After installation is complete, using a scan tool select the ETC RELEARN function. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .

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

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

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .

Scheme 128

Scheme 129

Scheme 130

Scheme 131

Scheme 132

Scheme 133

1. ACTIVE DTC NOTE: If a 5-Volt supply DTC has also set, diagnose the 5-Volt DTC before continuing. NOTE: Make sure the throttle moves freely and does not hang up at Wide Open Throttle, by performing the Throttle Follower Test. NOTE: If P2101 is also set, then make sure that the blade moves freely and does not hang up near Wide Open Throttle before trying to repair P0222. 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 may result in possible serious or fatal injury. 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 step 2 No Go to step 11
2. P0122 ALSO SET Was the P0122-TP SENSOR NO. 1 VOLTAGE LOW DTC set along with the P0222? Yes Go to step 3 No Go to step 4
3. (F855) 5-VOLT SUPPLY CIRCUIT Turn the ignition off. Disconnect the Throttle Body harness connector. Ignition on, engine not running. Measure the voltage on the (F855) 5-volt Supply circuit in the Throttle Body harness connector. Is the voltage between 4.5 to 5.02 volts? Yes Go to step 4 No Go to step 8
4. THROTTLE POSITION SENSOR Connect a jumper wire between the (F855) 5-volt Supply circuit and the (K122) TP Sensor No. 2 Signal circuit in the Throttle Body harness connector. With the scan tool, monitor the TP Sensor No. 2 voltage. Is the voltage between 4.8 and 5.0 volts with the jumper wire installed? Yes Verify that there is good pin to terminal contact in the Throttle Body and Powertrain Control Module connectors. Disconnect the Battery when replacing the Throttle Body Assembly. Replace the Throttle Body Assembly if no problems were found in the connectors. After installation is complete, with a scan tool select the ETC RELEARN function. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 5 NOTE: Remove the jumper wire before continuing.
5. (K122) TP SENSOR NO. 2 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 PCM Pinout Box 8815 to perform diagnosis. Measure the resistance of the (K122) TP Sensor No. 2 Signal circuit from the Throttle Body harness connector to the appropriate terminal of PCM Pinout Box 8815. Is the resistance below 5.0 Ohms? Yes Go to step 6 No Repair the open in the (K122) TP Sensor No. 2 Signal circuit. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
6. (K122) TP SENSOR NO. 2 SIGNAL CIRCUIT SHORTED TO GROUND Measure the resistance between ground and the (K122) TP Sensor No. 2 Signal circuit at the Throttle Body harness connector. Is the resistance below 100 Ohms? Yes Repair the short to ground in the (K122) TP Sensor No. 2 Signal. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 7
7. (K122) TP SENSOR NO. 2 SIGNAL CIRCUIT SHORTED TO THE (K922) TP SENSOR RETURN CIRCUIT Measure the resistance between the (K122) TP Sensor No. 2 Signal circuit and the (K922) TP Sensor Return circuit at the Throttle Body harness connector. Is the resistance below 100 Ohms? Yes Repair the short between the (K922) TP Sensor Return circuit and the (K122) TP Sensor No. 2 Signal circuit. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 10
8. (F855) 5-VOLT SUPPLY CIRCUIT OPEN Turn the ignition off. Disconnect the C2 PCM harness connector. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install PCM Pinout Box 8815 to perform diagnosis. Measure the resistance of the (F855) 5-volt Supply circuit from the Throttle Body harness connector to the appropriate terminal of PCM Pinout Box 8815. Is the resistance below 5.0 Ohms? Yes Go to step 9 No Repair the open in the (F855) 5-volt Supply circuit. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
9. (F855) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND Measure the resistance between ground and the (F855) 5-volt Supply circuit at the Throttle Body harness connector. Is the resistance below 100 Ohms? Yes Repair the short to ground in the (F855) 5-volt Supply circuit. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 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. Perform any Technical Service Bulletins that may apply. Were there any problems found? Yes Repair as necessary. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Replace and program the Powertrain Control Module in accordance with the Service Information. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
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 Perform the INTERMITTENT CONDITION diagnostic procedure. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Verify that there is good pin to terminal contact in the Throttle Body and Powertrain Control Module connectors. Disconnect the Battery when replacing the Throttle Body Assembly. Replace the Throttle Body Assembly if no problems were found in the connectors. After installation is complete, with a scan tool select the ETC RELEARN function. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .

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. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .

Scheme 134

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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 may result in possible serious or fatal injury. 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 step 2 No Go to step 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. NOTE: The sensor voltage should be approximately 0.0 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 Throttle Body and Powertrain Control Module connectors. Disconnect the Battery when replacing the Throttle Body Assembly. Replace the Throttle Body Assembly if no problems were found in the connectors. After installation is complete, with the scan tool select the ETC RELEARN function. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 3
3. (K122) TP SENSOR NO. 2 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 (K122) TP Sensor No. 2 Signal circuit at the Throttle Body harness connector. Is there any voltage present? Yes Repair the short to voltage in the (K122) TP Sensor No. 2 Signal circuit. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 4
4. (K122) TP SENSOR NO. 2 SIGNAL CIRCUIT SHORTED TO THE (F855) 5-VOLT SUPPLY CIRCUIT Measure the resistance between the (K122) TP Sensor No. 2 Signal circuit and the (F855) 5-volt Supply circuit at the Throttle Body harness connector. Is the resistance below 100 Ohms? Yes Repair the short between the (K122) TP Sensor No. 2 Signal circuit and the (F855) 5-volt Supply circuit. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 5
5. (K922) TP SENSOR RETURN CIRCUIT OPEN CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install PCM Pinout Box 8815 to perform diagnosis. Measure the resistance of the (K922) TP Sensor Return circuit from the Throttle Body harness connector to the appropriate terminal of PCM Pinout Box 8815. Is the resistance below 5.0 Ohms? Yes Go to step 6 No Repair the open in the (K922) TP Sensor Return circuit. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
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. Perform any Technical Service Bulletins that may apply. Were there any problems found? Yes Repair as necessary. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Replace and program the Powertrain Control Module in accordance with the Service Information. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
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 Perform the INTERMITTENT CONDITION diagnostic procedure. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Verify that there is good pin to terminal contact in the Throttle Body and Powertrain Control Module connectors. Disconnect the Battery when replacing the Throttle Body Assembly. Replace the Throttle Body Assembly if no problems were found in the connectors. After installation is complete, with the scan tool select the ETC RELEARN function. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .

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. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .

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. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .

Scheme 137

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Scheme 141

1. ACTIVE DTC 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 may result in possible serious or fatal injury. 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 the scan tool, select View DTCs. Is the DTC Active at this time? Yes Go to step 2 No Perform the INTERMITTENT CONDITION diagnostic procedure. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
2. VISUAL INSPECTION NOTE: Anything that affects the speed of the crankshaft can cause a misfire DTC. NOTE: When a Misfire is detected for a particular cylinder, the PCM will shut down that cylinders Injector Control circuit. Visually inspect the engine for any of the following conditions: Worn serpentine belt Binding Engine-Driven accessories: A/C Compressor, P/S Pump, Water pump. Misalignment of the Water pump, P/S Pump and A/C Compressor pulleys Corroded PCM power and ground circuits. Improper CKP, CMP, MAP and TP Sensor mounting Poor connector/terminal to component connection. i.e., CKP sensor, Fuel Injector, Ignition coil, etc. Vacuum leaks Restricted Air Induction system or Exhaust system. Internal engine component failures. Were any of the above conditions present? Yes Repair as necessary. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 3
3. (A955) ASD RELAY OUTPUT CIRCUIT Turn the ignition off. Disconnect the Ignition Coil No. 1 harness connector. Disconnect the Fuel Injector No. 1 harness connector. Ignition on, engine not running. Using a 12-volt test light connected to ground, probe the (A955) ASD Relay Output circuit in the Ignition Coil harness connector and Fuel Injector harness connector while the relay is actuating. NOTE: Make sure the test light is probing the circuit before actuating the Relay or a DTC may set and not allow the actuation. With the scan tool, actuate the ASD Relay. Does the test light illuminate brightly? Yes Go to step 4 No Repair the excessive resistance or short to ground in the (A955) ASD Relay Output circuit. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
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 may result in possible serious or fatal injury. Turn the ignition off. Connect the Ignition Coil No. 1 harness connector. Remove the Ignition Coil. Leave the Fuel Injector harness connector of the cylinder being tested disconnected. Install a spark tester on the Ignition Coil. While cranking the engine observe the spark coming from the spark tester. If an ignition wire exists, perform the same test on the ignition wire side of the Ignition Coil. NOTE: A crisp blue spark that is able to jump the gap of the spark tester should be generated at the coil on plug and at the end of the ignition wire. Is good spark present? Yes Go to step 5 No Go to step 14 NOTE: Connect the Fuel Injector harness connector before continuing.
5. SPARK PLUG CAUTION: The 4.7L engine uses TWO DIFFERENT types of spark plugs. A total of 16 plugs are used. The plugs are mounted in two rows (banks). The upper row is used on the intake valve side of the cylinder head. The lower row is used on the exhaust valve side of the cylinder head. The upper row uses Nickel Yttrium plugs. The lower row uses Iridium plugs. DO NOT INTERCHANGE THESE PLUGS. Turn the ignition off. Remove the Spark Plug(s) in accordance with the Service Information. Inspect the Spark Plug(s) 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 in accordance with the Service Information. Refer to «Electrical/Ignition Control/SPARK PLUG - Removal»(ref-352658-S03762488782010010600000) Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 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 possible serious or fatal injury. Install Fuel Pressure Decay Tester 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 step 7 Below Specification Go to step 12 Above Specification Replace the fuel filter/pressure regulator. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
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 possible serious or fatal injury. Turn the ignition off. Install the Fuel Pressure Decay Tester 8978A. 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). Close the Fuel System Isolation Valve and then wait 5 minutes before proceeding. Read the Fuel Inlet (2) and Fuel Outlet (3) Pressure Gauges. The pressure should not drop more than 10 psi on either gauge. Monitor the fuel pressure gauge for a minimum of five minutes. NOTE: The pressure should not fall below 10 psi. Does the fuel pressure gauge indicate a drop in fuel pressure? Yes - On Fuel Inlet Gauge Replace the fuel pump module. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . Yes - On Fuel Outlet Gauge Replace the leaking fuel injector(s). Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 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 possible serious or fatal injury. 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. NOTE: When a Misfire is detected for a particular cylinder, the PCM will shut down that cylinder's Injector Control circuit. Clear the DTC before continuing. 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 step 9 No Go to step 10 NOTE: Turn the ignition off, remove the Fuel Pressure gauge and connect the fuel lines before continuing.
9. ENGINE MECHANICAL PROBLEM 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 the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 17
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 Replace the Fuel Injector. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 11
11. (K11) INJECTOR CONTROL NO. 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 PCM Pinout Box 8815 to perform diagnosis. Check the (K11) Injector Control No. 1 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 Control No. 1 circuit. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 17
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 possible serious or fatal injury. 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 the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 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 possible serious or fatal injury. 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 the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . 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 the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
14. IGNITION WIRE NOTE: If the vehicle being tested does not have an ignition wire, answer YES to this test and continue. Turn the ignition off. Remove the ignition wire. Measure the resistance of the ignition wire. Is the resistance below 10K Ohms? Yes Go to step 15 No Replace the Ignition Wire. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
15. 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 may result in possible serious or fatal injury. Disconnect the Ignition Coil harness connector. Remove the Fuel Pump Relay. Using a 12-volt test light connected to 12-volts, probe the (K19) Coil Control No. 1 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 five seconds while observing the test light. NOTE: The primary resistance of the 3.7L and 4.7L Ignition coil is 0.6 to 0.9 of an Ohm at 25°C (77°F). 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 in accordance with the Service Information. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 16
16. (K19) COIL CONTROL NO. 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 PCM Pinout Box 8815 to perform diagnosis. Check the (K19) Coil Control No. 1 circuit for an open, short to ground and short to voltage. Was a problem found with the (K19) Coil Control No. 1 circuit? Yes Repair the (K19) Coil Control No. 1 circuit. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 17
17. POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the related Sensors, Ignition Coil, Fuel 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, Ignition Coil, Fuel Injector and Powertrain Control Module connectors. Perform any Technical Service Bulletins that may apply. Were there any problems found? Yes Repair as necessary. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Replace and program the Powertrain Control Module in accordance with the Service Information. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .

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 one failure to set a Pending Fault and two trips to set the MIL. Three good trips to turn off the MIL.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .

Scheme 142

Scheme 143

Scheme 144

Scheme 145

Scheme 146

1. ACTIVE DTC 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 may result in possible serious or fatal injury. 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 the scan tool, select View DTCs. Is the DTC Active at this time? Yes Go to step 2 No Perform the INTERMITTENT CONDITION diagnostic procedure. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
2. VISUAL INSPECTION NOTE: Anything that affects the speed of the crankshaft can cause a misfire DTC. NOTE: When a Misfire is detected for a particular cylinder, the PCM will shut down that cylinder's Injector Control circuit. Visually inspect the engine for any of the following conditions: Worn serpentine belt Binding Engine-Driven accessories: A/C Compressor, P/S Pump, Water pump. Misalignment of the Water pump, P/S Pump and A/C Compressor pulleys Corroded PCM power and ground circuits. Misalignment of the Water pump, P/S Pump and A/C Compressor pulleys Corroded PCM power and ground circuits. Improper CKP, CMP, MAP and TP Sensor mounting Poor connector/terminal to component connection for CKP sensor, CMP sensor, MAP sensor, TP sensor, fuel injector, ignition coil, etc. Vacuum leaks Restricted Air Induction system or Exhaust system. Internal engine component failures. Were any of the above conditions present? Yes Repair as necessary. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 3
3. (A955) ASD CONTROL OUTPUT CIRCUIT NOTE: Diagnose any ASD related DTCs before continuing. Turn the ignition off. NOTE: The 3.7L V6 engine uses a modified Distributorless Ignition System (DIS) with coil consolidation on the left side engine bank. Disconnect the Ignition Coil No. 2 or No. 5 harness connector. Disconnect the Fuel Injector No. 2 harness connector. Ignition on, engine not running. Using a 12-volt test light connected to ground, probe the (A955) ASD Control Output circuit in the Ignition Coil harness connector and Fuel Injector harness connector before the actuation. NOTE: Make sure the test light is probing the circuit before actuating the Relay or a DTC may set and not allow the actuation. With the scan tool, actuate the ASD. Does the test light illuminate brightly? Yes Go to step 4 No Repair the excessive resistance or short to ground in the (A955) ASD Control Output circuit. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
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 may result in possible serious or fatal injury. Turn the ignition off. Connect the Ignition Coil No. 2 or No. 5 harness connector. Remove the Ignition Coil. Leave the Fuel Injector harness connector of the cylinder being tested disconnected. Install a spark tester on the Ignition Coil. While cranking the engine observe the spark coming from the spark tester. Perform the same test on the ignition wire side of the Ignition coil. NOTE: A crisp blue spark that is able to jump the gap of the spark tester should be generated at the coil on plug and at the end of the ignition wire. Is good spark present? Yes Go to step 5 No Go to step 14 NOTE: Connect the Fuel Injector harness connector before continuing.
5. SPARK PLUG CAUTION: The 4.7L engine uses TWO DIFFERENT types of spark plugs. A total of 16 plugs are used. The plugs are mounted in two rows (banks). The upper row is used on the intake valve side of the cylinder head. The lower row is used on the exhaust valve side of the cylinder head. The upper row uses Nickel Yttrium plugs. The lower row uses Iridium plugs. DO NOT INTERCHANGE THESE PLUGS. Turn the ignition off. Remove the Spark Plug(s) in accordance with the Service Information. Inspect the Spark Plug(s) 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 in accordance with the Service Information. Refer to «Electrical - Ignition Control/Ignition Control/SPARK PLUG - Removal»(ref-352658-S03762488782010010600000) . Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 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 possible serious or fatal injury. Install Fuel Pressure Decay Tester 8978 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 step 7 Below Specification Go to step 12 Above Specification Replace the fuel filter/pressure regulator. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
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 possible serious or fatal injury. Turn the ignition off. Install the Fuel Pressure Decay Tester 8978. 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). Close the Fuel System Isolation Valve and then wait five minutes before proceeding. Read the Fuel Inlet and Fuel Outlet Pressure Gauges. The pressure should not drop more than 10 psi on either gauge. Monitor the fuel pressure gauge for a minimum of five minutes. NOTE: The pressure should not fall below 10 psi. Does the fuel pressure gauge indicate a drop in fuel pressure? Yes - On Fuel Inlet Gauge Replace the fuel pump module. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . Yes - On Fuel Outlet Gauge Replace the leaking fuel injector(s). Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 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 possible serious or fatal injury. CAUTION: After each Fuel Injector actuation, start the engine to clean the cylinder of fuel. Failure to do so could cause engine damage. Open the Fuel System Isolation Valve Start the engine and allow the fuel pressure to reach maximum pressure. Turn the ignition off. 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 step 9 No Go to step 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 the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 17
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 Fuel Injector and the Powertrain Control Module connectors. If OK, replace the Fuel Injector. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 11
11. (K12) INJECTOR CONTROL NO. 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 PCM Pinout Box 8815 to perform diagnosis. Check the (K12) Injector Control No. 2 circuit for an open, short to ground and short to voltage. Was a problem found with the (K12) Injector Control No. 2 circuit? Yes Repair the excessive resistance or short in the (K12) Injector Control No. 2 circuit. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 17
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 possible serious or fatal injury. Turn the ignition off. Raise the vehicle on a hoist and disconnect the fuel pressure line at the fuel pump module. Install the Fuel Pressure Decay Tester 8978 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 the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 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 possible serious or fatal injury. 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 the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . 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 the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
14. IGNITION WIRE NOTE: If the vehicle or the cylinder being tested does not have an ignition wire answer YES to this test and continue. Turn the ignition off. Remove the ignition wire. Measure the resistance of the ignition wire. Is the resistance below 10K Ohms? Yes Go to step 15 No Replace the Ignition Wire. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
15. 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 may result in possible serious or fatal injury. NOTE: The 3.7L V6 engine uses a modified Distributorless Ignition System (DIS) with coil consolidation on the left side engine bank. Disconnect the Ignition Coil harness connector. Using a 12-volt test light connected to 12-volts, probe the (K17) Coil Control circuit. Crank the engine for five seconds while observing the test light. NOTE: The primary resistance of the 3.7L and 4.7L Ignition coil is 0.6 to 0.9 of an Ohm at 25°C (77°F). Does the test light brightly blink/flicker during the actuation? Yes Verify that there is good pin to terminal contact in the Ignition Coil and the Powertrain Control Module connectors. If OK, replace the Ignition Coil in accordance with the Service Information. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 16
16. (K17) COIL 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 PCM Pinout Box 8815 to perform diagnosis. Check the (K17) Coil Control circuit for an open, short to ground and short to voltage. Was a problem found with the (K17) Coil Control circuit? Yes Repair the (K17) Coil Control circuit. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 17
17. 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. Perform any Technical Service Bulletins that may apply. Were there any problems found? Yes Repair as necessary. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Replace and program the Powertrain Control Module in accordance with the Service Information. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .

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. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .

Scheme 147

Scheme 148

Scheme 149

Scheme 150

Scheme 151

1. ACTIVE DTC 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 may result in possible serious or fatal injury. 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 the scan tool, select View DTCs. Is the DTC Active at this time? Yes Go to step 2 No Perform the INTERMITTENT CONDITION diagnostic procedure. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
2. VISUAL INSPECTION NOTE: Anything that affects the speed of the crankshaft can cause a misfire DTC. NOTE: When a Misfire is detected for a particular cylinder, the PCM will shut down that cylinder's Injector Control circuit. Visually inspect the engine for any of the following conditions: Worn serpentine belt Binding Engine-Driven accessories: A/C Compressor, P/S Pump, Water pump. Misalignment of the Water pump, P/S Pump and A/C Compressor pulleys Corroded PCM power and ground circuits. Improper CKP, CMP, MAP and TP Sensor mounting Poor connector/terminal to component connection. i.e., CKP sensor, Fuel Injector, Ignition coil, etc. Vacuum leaks Restricted Air Induction system or Exhaust system. Internal engine component failures. Were any of the above conditions present? Yes Repair as necessary. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 3
3. (A955) ASD RELAY OUTPUT CIRCUIT Turn the ignition off. Disconnect the No. 3 Ignition Coil harness connector. Disconnect the No. 3 Fuel Injector harness connector. Ignition on, engine not running. Using a 12-volt test light connected to ground, probe the (A955) ASD Relay Output circuit in the Ignition Coil harness connector and Fuel Injector harness connector while the relay is actuating. NOTE: Make sure the test light is probing the circuit before actuating the Relay or a DTC may set and not allow the actuation. With the scan tool, actuate the ASD Relay. Does the test light illuminate brightly? Yes Go to step 4 No Repair the excessive resistance or short to ground in the (A955) ASD Relay Output circuit. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
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 may result in possible serious or fatal injury. Turn the ignition off. Connect the Ignition Coil No. 3 harness connector. Remove the Ignition Coil. Leave the Fuel Injector harness connector of the cylinder being tested disconnected. Install a spark tester on the Ignition Coil. While cranking the engine observe the spark coming from the spark tester. If an ignition wire exists, perform the same test on the ignition wire side of the Ignition Coil. NOTE: A crisp blue spark that is able to jump the gap of the spark tester should be generated at the coil on plug and at the end of the ignition wire. Is good spark present? Yes Go to step 5 No Go to step 14 NOTE: Connect the Fuel Injector harness connector before continuing.
5. SPARK PLUG CAUTION: The 4.7L engine uses TWO DIFFERENT types of spark plugs. A total of 16 plugs are used. The plugs are mounted in two rows (banks). The upper row is used on the intake valve side of the cylinder head. The lower row is used on the exhaust valve side of the cylinder head. The upper row uses Nickel Yttrium plugs. The lower row uses Iridium plugs. DO NOT INTERCHANGE THESE PLUGS. Turn the ignition off. Remove the Spark Plug(s) in accordance with the Service Information. Inspect the Spark Plug(s) 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 in accordance with the Service Information. Refer to «Electrical/Ignition Control/SPARK PLUG - Removal»(ref-352658-S03762488782010010600000) Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 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 possible serious or fatal injury. 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 may result in possible serious or fatal injury. Install Fuel Pressure Decay Tester 8978A 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 step 7 Below Specification Go to step 12 Above Specification Replace the fuel filter/pressure regulator. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . 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 possible serious or fatal injury. Turn the ignition off. Install the Fuel Pressure Decay Tester 8978A. 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). Close the Fuel System Isolation Valve and then wait five minutes before proceeding. Read the Fuel Inlet and Fuel Outlet Pressure Gauges. The pressure should not drop more than 10 psi on either gauge. Monitor the fuel pressure gauge for a minimum of five minutes. NOTE: The pressure should not decrease by greater than 69 kPa (10 psi) Does the pressure fall below the listed specification? Yes - On Fuel Inlet Gauge Replace the fuel pump module. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . Yes - On Fuel Outlet Gauge Replace the leaking fuel injector(s). Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 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 possible serious or fatal injury. CAUTION: After each Fuel Injector actuation, start the engine to clean the cylinder of fuel. Failure to do so could cause engine damage. Remove the Hose Clamp Pliers C4390. Start the engine and allow the fuel pressure to reach maximum pressure. 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. Clear the DTC before continuing. 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 step 9 No Go to step 10 NOTE: Turn the ignition off, remove the Fuel Pressure gauge and connect the fuel lines before continuing.
9. ENGINE MECHANICAL PROBLEM 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 the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 17
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 Replace the Fuel Injector. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 11
11. (K13) INJECTOR CONTROL NO. 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 PCM Pinout Box 8815 to perform diagnosis. Check the (K13) Injector Control No. 3 circuit for an open, short to ground and short to voltage. Was a problem found with the (K13) Injector Control No. 3 circuit? Yes Repair the excessive resistance or short in the (K13) Injector Control No. 3 circuit. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 17
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 possible serious or fatal injury. Turn the ignition off. Raise vehicle on hoist and disconnect the fuel pressure line at the fuel pump module. Install fuel line adapter 6539 (5/16") or 6631(3/8") 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 the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 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 possible serious or fatal injury. 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 the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . 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 the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
14. IGNITION WIRE NOTE: If the vehicle being tested does not have an ignition wire, answer YES to this test and continue. Turn the ignition off. Remove the ignition wire. Measure the resistance of the ignition wire. Is the resistance below 10K Ohms? Yes Go to step 15 No Replace the Ignition Wire. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
15. 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 may result in possible serious or fatal injury. Disconnect the No. 3 Ignition Coil harness connector. Remove the Fuel Pump Relay. Using a 12-volt test light connected to 12-volts, probe the (K18) Coil Control No. 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 five seconds while observing the test light. NOTE: The primary resistance of the 3.7L and 4.7L Ignition coil is 0.6 to 0.9 of an Ohm at 25°C (77°F). 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 in accordance with the Service Information. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 16
16. (K18) COIL CONTROL NO. 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 PCM Pinout Box 8815 to perform diagnosis. Check the (K18) Coil Control No. 3 circuit for an open, short to ground and short to voltage. Was a problem found with the (K18) Coil Control No. 3 circuit? Yes Repair the (K18) Coil Control No. 3 circuit. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 17
17. POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the related Sensors, Ignition Coil, Fuel 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, Ignition Coil, Fuel Injector and Powertrain Control Module connectors. Perform any Technical Service Bulletins that may apply. Were there any problems found? Yes Repair as necessary. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Replace and program the Powertrain Control Module in accordance with the Service Information. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .

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 one failure to set a Pending Fault and two trips to set the MIL. Three good trips to turn off the MIL.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .

Scheme 152

Scheme 153

Scheme 154

1. ACTIVE DTC 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 may result in possible serious or fatal injury. 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 the scan tool, select View DTCs. Is the DTC Active at this time? Yes Go to step 2 No Perform the INTERMITTENT CONDITION diagnostic procedure. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
2. VISUAL INSPECTION NOTE: Anything that affects the speed of the crankshaft can cause a misfire DTC. NOTE: When a Misfire is detected for a particular cylinder, the PCM will shut down that cylinder's Injector Control circuit. Visually inspect the engine for any of the following conditions: Worn serpentine belt Binding Engine-Driven accessories: A/C Compressor, P/S Pump, Water pump. Misalignment of the Water pump, P/S Pump and A/C Compressor pulleys Corroded PCM power and ground circuits. Misalignment of the Water pump, P/S Pump and A/C Compressor pulleys Corroded PCM power and ground circuits. Improper CKP, CMP, MAP and TP Sensor mounting Poor connector/terminal to component connection for CKP sensor, CMP sensor, MAP sensor, TP sensor, fuel injector, ignition coil, etc. Vacuum leaks Restricted Air Induction system or Exhaust system. Internal engine component failures. Were any of the above conditions present? Yes Repair as necessary. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 3
3. (A955) ASD CONTROL OUTPUT CIRCUIT Turn the ignition off. NOTE: The 3.7L V6 engine uses a modified Distributorless Ignition System (DIS) with coil consolidation on the left side engine bank. Disconnect the No. 4 or No. 1 Ignition Coil harness connector. Disconnect the No. 4 Fuel Injector harness connector. Ignition on, engine not running. Using a 12-volt test light connected to ground, probe the (A955) ASD Control Output circuit in the Ignition Coil harness connector and Fuel Injector harness connector before the actuation. NOTE: Make sure the test light is probing the circuit before actuating the Relay or a DTC may set and not allow the actuation. With the scan tool, actuate the ASD. Does the test light illuminate brightly? Yes Go to step 4 No Repair the excessive resistance or short to ground in the (A955) ASD Control Output circuit. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
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 may result in possible serious or fatal injury. Turn the ignition off. Connect the No. 4 or No. 1 Ignition Coil harness connector. Remove the Ignition Coil. Leave the Fuel Injector harness connector of the cylinder being tested disconnected. Install a spark tester on the Ignition Coil. While cranking the engine observe the spark coming from the spark tester. Perform the same test on the ignition wire side of the Ignition coil. NOTE: A crisp blue spark that is able to jump the gap of the spark tester should be generated at the coil on plug and at the end of the ignition wire. Is good spark present? Yes Go to step 5 No Go to step 14 NOTE: Connect the Fuel Injector harness connector before continuing.
5. SPARK PLUG CAUTION: The 4.7L engine uses TWO DIFFERENT types of spark plugs. A total of 16 plugs are used. The plugs are mounted in two rows (banks). The upper row is used on the intake valve side of the cylinder head. The lower row is used on the exhaust valve side of the cylinder head. The upper row uses Nickel Yttrium plugs. The lower row uses Iridium plugs. DO NOT INTERCHANGE THESE PLUGS. Turn the ignition off. Remove the Spark Plug(s) in accordance with the Service Information. Inspect the Spark Plug(s) 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 in accordance with the Service Information. Refer to «Electrical - Ignition Control/Ignition Control/SPARK PLUG - Removal»(ref-352658-S03762488782010010600000) . Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 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 possible serious or fatal injury. 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 may result in possible serious or fatal injury. Install the Fuel Pressure Decay Tester 8978 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 step 7 Below Specification Go to step 12 Above Specification Replace the fuel filter/pressure regulator. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
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 possible serious or fatal injury. Turn the ignition off. Install the Fuel Pressure Decay Tester 8978. 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). Close the Fuel System Isolation Valve and then wait five minutes before proceeding. Read the Fuel Inlet and Fuel Outlet Pressure Gauges. The pressure should not drop more than 10 psi on either gauge. Monitor the fuel pressure gauge for a minimum of five minutes. NOTE: The pressure should not decrease by greater than 69 kPa (10 psi) Does the pressure fall below the listed specification? Yes - On Fuel Inlet Gauge Replace the fuel pump module. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . Yes - On Fuel Outlet Gauge Replace the leaking fuel injector(s). Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 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 possible serious or fatal injury. CAUTION: After each Fuel Injector actuation, start the engine to clean the cylinder of fuel. Failure to do so could cause engine damage. Open the Fuel System Isolation Valve. Start the engine and allow the fuel pressure to reach maximum pressure. Turn the ignition off. 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 step 9 No Go to step 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 the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 17
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 Fuel Injector and the Powertrain Control Module connectors. If OK, replace the Fuel Injector. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 11
11. (K14) INJECTOR CONTROL NO. 4 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 PCM Pinout Box 8815 to perform diagnosis. Check the (K14) Injector Control No. 4 circuit for an open, short to ground and short to voltage. Was a problem found with the (K14) Injector Control No. 4 circuit? Yes Repair the excessive resistance or short in the (K14) Injector Control No. 4 circuit. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 17
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 possible serious or fatal injury. Turn the ignition off. Raise vehicle on hoist and disconnect the fuel pressure line at the fuel pump module. Install the Fuel Pressure Decay Tester 8978 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 the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 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 possible serious or fatal injury. 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 the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . 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 the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
14. IGNITION WIRE NOTE: If the vehicle or cylinder being tested does not have an ignition wire answer YES to this test and continue. Turn the ignition off. Remove the ignition wire. Measure the resistance of the ignition wire. Is the resistance below 10K Ohms? Yes Go to step 15 No Replace the Ignition Wire. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
15. 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 may result in possible serious or fatal injury. NOTE: The 3.7L V6 engine uses a modified Distributorless Ignition System (DIS) with coil consolidation on the left side engine bank. Disconnect the No. 4 or No. 1 Ignition Coil harness connector. Using a 12-volt test light connected to 12-volts, probe the (K15) or the (K19) Coil Control circuit. Crank the engine for five seconds while observing the test light. NOTE: The primary resistance of the 3.7L and 4.7L Ignition coil is 0.6 to 0.9 of an at 25°C (77°F). Does the test light brightly blink/flicker? Yes Verify that there is good pin to terminal contact in the Ignition Coil and the Powertrain Control Module connectors. If OK, replace the Ignition Coil in accordance with the Service Information. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 16
16. COIL 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 PCM Pinout Box 8815 to perform diagnosis. Check the (K15) or the (K19) Coil Control circuit for an open, short to ground and short to voltage. Was a problem found with the Coil Control circuit? Yes Repair the (K15) or the (K19) Coil Control circuit. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 17
17. 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. Perform any Technical Service Bulletins that may apply. Were there any problems found? Yes Repair as necessary. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Replace and program the Powertrain Control Module in accordance with the Service Information. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .

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. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .

Scheme 155

Scheme 156

Scheme 157

1. ACTIVE DTC 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 may result in possible serious or fatal injury. 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 the scan tool, select View DTCs. Is the DTC Active at this time? Yes Go to step 2 No Perform the INTERMITTENT CONDITION diagnostic procedure. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
2. VISUAL INSPECTION NOTE: Anything that affects the speed of the crankshaft can cause a misfire DTC. NOTE: When a Misfire is detected for a particular cylinder, the PCM will shut down that cylinder's Injector Control circuit. Visually inspect the engine for any of the following conditions: Worn serpentine belt Binding Engine-Driven accessories: A/C Compressor, P/S Pump, Water pump. Misalignment of the Water pump, P/S Pump and A/C Compressor pulleys Corroded PCM power and ground circuits. Improper CKP, CMP, MAP and TP Sensor mounting Poor connector/terminal to component connection. i.e., CKP sensor, Fuel Injector, Ignition coil, etc. Vacuum leaks Restricted Air Induction system or Exhaust system. Internal engine component failures. Were any of the above conditions present? Yes Repair as necessary. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 3
3. (A955) ASD RELAY OUTPUT CIRCUIT Turn the ignition off. Disconnect the No. 5 Ignition Coil harness connector. Disconnect the No. 5 Fuel Injector harness connector. Ignition on, engine not running. Using a 12-volt test light connected to ground, probe the (A955) ASD Relay Output circuit in the Ignition Coil harness connector and Fuel Injector harness connector while the relay is actuating. NOTE: Make sure the test light is probing the circuit before actuating the Relay or a DTC may set and not allow the actuation. With the scan tool, actuate the ASD Relay. Does the test light illuminate brightly? Yes Go to step 4 No Repair the excessive resistance or short to ground in the (A955) ASD Relay Output circuit. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
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 may result in possible serious or fatal injury. Turn the ignition off. Connect the Ignition Coil No. 5 harness connector. Remove the Ignition Coil. Leave the Fuel Injector harness connector of the cylinder being tested disconnected. Install a spark tester on the Ignition Coil. While cranking the engine observe the spark coming from the spark tester. If an ignition wire exists, perform the same test on the ignition wire side of the Ignition Coil. NOTE: A crisp blue spark that is able to jump the gap of the spark tester should be generated at the coil on plug and at the end of the ignition wire. Is good spark present? Yes Go to step 5 No Go to step 14 NOTE: Connect the Fuel Injector harness connector before continuing.
5. SPARK PLUG CAUTION: The 4.7L engine uses TWO DIFFERENT types of spark plugs. A total of 16 plugs are used. The plugs are mounted in two rows (banks). The upper row is used on the intake valve side of the cylinder head. The lower row is used on the exhaust valve side of the cylinder head. The upper row uses Nickel Yttrium plugs. The lower row uses Iridium plugs. DO NOT INTERCHANGE THESE PLUGS. Turn the ignition off. Remove the Spark Plug(s) in accordance with the Service Information. Inspect the Spark Plug(s) 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. Refer to «Electrical/Ignition Control/SPARK PLUG - Removal»(ref-352658-S03762488782010010600000) Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 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 possible serious or fatal injury. 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 may result in possible serious or fatal injury. Install Fuel Pressure Decay Tester 8978A 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 step 7 Below Specification Go to step 12 Above Specification Replace the fuel filter/pressure regulator. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . 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 possible serious or fatal injury. Turn the ignition off. Install the Fuel Pressure Decay Tester 8978A. 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). Close the Fuel System Isolation Valve and then wait five minutes before proceeding. Read the Fuel Inlet and Fuel Outlet Pressure Gauges. The pressure should not drop more than 10 psi on either gauge. Monitor the fuel pressure gauge for a minimum of five minutes. NOTE: The pressure should not decrease by greater than 69 kPa (10 psi) Does the pressure fall below the listed specification? Yes - On Fuel Inlet Gauge Replace the fuel pump module. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . Yes - On Fuel Outlet Gauge Replace the leaking fuel injector(s). Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 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 possible serious or fatal injury. CAUTION: After each Fuel Injector actuation, start the engine to clean the cylinder of fuel. Failure to do so could cause engine damage. Remove Hose Clamp Pliers C4390. Start the engine and allow the fuel pressure to reach maximum pressure. Ignition on, engine not running. NOTE: When a Misfire is detected for a particular cylinder, the PCM will shut down that cylinders Injector Control circuit. Clear the DTC before continuing. 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 step 9 No Go to step 10 NOTE: Turn the ignition off, remove the Fuel Pressure gauge and connect the fuel lines before continuing.
9. ENGINE MECHANICAL PROBLEM 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 the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 17
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 Replace the Fuel Injector. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 11
11. (K38) INJECTOR CONTROL NO. 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 PCM Pinout Box 8815 to perform diagnosis. Check the (K38) Injector Control No. 5 circuit for an open, short to ground and short to voltage. Was a problem found with the (K38) Injector Control No. 5 circuit? Yes Repair the excessive resistance or short in the (K38) Injector Control No. 5 circuit. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 17
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 possible serious or fatal injury. Turn the ignition off. Raise vehicle on hoist and disconnect the fuel pressure line at the fuel pump module. Install fuel line adapter 6539 (5/16") or 6631(3/8") 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 the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 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 possible serious or fatal injury. 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 the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . 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 the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
14. IGNITION WIRE NOTE: If the vehicle being tested does not have an ignition wire, answer YES to this test and continue. Turn the ignition off. Remove the ignition wire. Measure the resistance of the ignition wire. Is the resistance below 10K Ohms? Yes Go to step 15 No Replace the Ignition Wire. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
15. 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 may result in possible serious or fatal injury. Disconnect the No. 5 Ignition Coil harness connector. Remove the Fuel Pump Relay. Using a 12-volt test light connected to 12-volts, probe the (K16) Coil Control No. 5 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 five seconds while observing the test light. NOTE: The primary resistance of the 3.7L and 4.7L Ignition coil is 0.6 to 0.9 of an Ohm at 25°C (77°F). 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 in accordance with the Service Information. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 16
16. (K16) COIL CONTROL NO. 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 PCM Pinout Box 8815 to perform diagnosis. Check the (K16) Coil Control No. 5 circuit for an open, short to ground and short to voltage. Was a problem found with the (K16) Coil Control No. 5 circuit? Yes Repair the (K16) Coil Control No. 5 circuit. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 17
17. POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the related Sensors, Ignition Coil, Fuel 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, Ignition Coil, Fuel Injector and Powertrain Control Module connectors. Perform any Technical Service Bulletins that may apply. Were there any problems found? Yes Repair as necessary. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Replace and program the Powertrain Control Module in accordance with the Service Information. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .

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 one fail to set a Pending Fault and two trips to set the MIL. Three good trips to turn off the MIL.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .

Scheme 158

1. ACTIVE DTC 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 may result in possible serious or fatal injury. 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 the scan tool, select View DTCs. Is the DTC Active at this time? Yes Go to step 2 No Perform the INTERMITTENT CONDITION diagnostic procedure. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
2. VISUAL INSPECTION NOTE: Anything that affects the speed of the crankshaft can cause a misfire DTC. NOTE: When a Misfire is detected for a particular cylinder, the PCM will shut down that cylinder's Injector Control circuit. Visually inspect the engine for any of the following conditions: Worn serpentine belt Binding Engine-Driven accessories: A/C Compressor, P/S Pump, Water pump. Misalignment of the Water pump, P/S Pump and A/C Compressor pulleys Corroded PCM power and ground circuits. Misalignment of the Water pump, P/S Pump and A/C Compressor pulleys Corroded PCM power and ground circuits. Improper CKP, CMP, MAP and TP Sensor mounting Poor connector/terminal to component connection for CKP sensor, CMP sensor, MAP sensor, TP sensor, fuel injector, ignition coil, etc. Vacuum leaks Restricted Air Induction system or Exhaust system. Internal engine component failures. Were any of the above conditions present? Yes Repair as necessary. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 3
3. (A955) ASD CONTROL OUTPUT CIRCUIT Turn the ignition off. NOTE: The 3.7L V6 engine uses a modified Distributorless Ignition System (DIS) with coil consolidation on the left side engine bank. Disconnect the No. 6 or the No. 3 Ignition Coil harness connector. Disconnect the No. 6 Fuel Injector harness connector. Ignition on, engine not running. Using a 12-volt test light connected to ground, probe the (A955) ASD Control Output circuit in the Ignition Coil harness connector and Fuel Injector harness connector before the actuation. NOTE: Make sure the test light is probing the circuit before actuating the Relay or a DTC may set and not allow the actuation. With the scan tool, actuate the ASD. Does the test light illuminate brightly? Yes Go to step 4 No Repair the excessive resistance or short to ground in the (A955) ASD Control Output circuit. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
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 may result in possible serious or fatal injury. Turn the ignition off. Connect the Ignition Coil No. 6 or the No. 3 harness connector. Remove the Ignition Coil. Leave the Fuel Injector harness connector of the cylinder being tested disconnected. Install a spark tester on the Ignition Coil. While cranking the engine observe the spark coming from the spark tester. Perform the same test on the ignition wire side of the Ignition coil. NOTE: A crisp blue spark that is able to jump the gap of the spark tester should be generated at the coil on plug and at the end of the ignition wire. Is good spark present? Yes Go to step 5 No Go to step 14 NOTE: Connect the Fuel Injector harness connector before continuing.
5. SPARK PLUG CAUTION: The 4.7L engine uses TWO DIFFERENT types of spark plugs. A total of 16 plugs are used. The plugs are mounted in two rows (banks). The upper row is used on the intake valve side of the cylinder head. The lower row is used on the exhaust valve side of the cylinder head. The upper row uses Nickel Yttrium plugs. The lower row uses Iridium plugs. DO NOT INTERCHANGE THESE PLUGS. Turn the ignition off. Remove the Spark Plug(s) in accordance with the Service Information. Inspect the Spark Plug(s) 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 in accordance with the Service Information. Refer to «Electrical - Ignition Control/Ignition Control/SPARK PLUG - Removal»(ref-352658-S03762488782010010600000) . Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 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 possible serious or fatal injury. 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 may result in possible serious or fatal injury. Install Fuel Pressure Decay Tester 8978 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 step 7 Below Specification Go to step 12 Above Specification Replace the fuel filter/pressure regulator. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . 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 possible serious or fatal injury. Turn the ignition off. Install the Fuel Pressure Decay Tester 8978. 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). Close the Fuel System Isolation Valve and then wait five minutes before proceeding. Read the Fuel Inlet and Fuel Outlet Pressure Gauges. The pressure should not drop more than 10 psi on either gauge. Monitor the fuel pressure gauge for a minimum of five minutes. NOTE: The pressure should not decrease by greater than 69 kPa (10 psi) Does the pressure fall below the listed specification? Yes - On Fuel Inlet Gauge Replace the fuel pump module. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . Yes - On Fuel Outlet Gauge Replace the leaking fuel injector(s). Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 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 possible serious or fatal injury. CAUTION: After each Fuel Injector actuation, start the engine to clean the cylinder of fuel. Failure to do so could cause engine damage. Open the Fuel System Isolation Valve. Start the engine and allow the fuel pressure to reach maximum pressure. Turn the ignition off. 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 step 9 No Go to step 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 the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 17
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 Fuel Injector and the Powertrain Control Module connectors. If OK, replace the Fuel Injector. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 11
11. (K58) INJECTOR CONTROL NO. 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 PCM Pinout Box 8815 to perform diagnosis. Check the (K58) Injector Control No. 6 circuit for an open, short to ground and short to voltage. Was a problem found with the (K58) Injector Control No. 6 circuit? Yes Repair the excessive resistance or short in the (K58) Injector Control No. 6 circuit. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 17
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 possible serious or fatal injury. Turn the ignition off. Raise vehicle on hoist and disconnect the fuel pressure line at the fuel pump module. Install Fuel Pressure Decay Tester 8978 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 the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 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 possible serious or fatal injury. 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 the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . 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 the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
14. IGNITION WIRE NOTE: If the vehicle or cylinder being tested does not have an ignition wire answer YES to this test and continue. Turn the ignition off. Remove the ignition wire. Measure the resistance of the ignition wire. Is the resistance below 10K Ohms? Yes Go to step 15 No Replace the Ignition Wire. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
15. 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 may result in possible serious or fatal injury. NOTE: The 3.7L V6 engine uses a modified Distributorless Ignition System (DIS) with coil consolidation on the left side engine bank. Disconnect the No. 6 or the No. 3 Ignition Coil harness connector. Using a 12-volt test light connected to 12-volts, probe the (K10) Coil Control No. 6 circuit. Crank the engine for five seconds while observing the test light. NOTE: The primary resistance of the 3.7L and 4.7L Ignition coil is 0.6 to 0.9 of an Ohm at 25°C (77°F). Does the test light brightly blink/flicker? Yes Verify that there is good pin to terminal contact in the Ignition Coil and the Powertrain Control Module connectors. If OK, replace the Ignition Coil in accordance with the Service Information. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 16
16. COIL CONTROL CIRCUIT Turn the ignition off. Disconnect the C2 PCM harness connector. Check the (K10) or the (K18) Coil Control circuit for an open, short to ground and short to voltage. Was a problem found with the Coil Control circuit? Yes Repair the (K10) or the (K18) Coil Control circuit. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 17
17. 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. Perform any Technical Service Bulletins that may apply. Were there any problems found? Yes Repair as necessary. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Replace and program the Powertrain Control Module in accordance with the Service Information. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .

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. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .

Scheme 159

Scheme 160

Scheme 161

1. ACTIVE DTC 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 may result in possible serious or fatal injury. 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 the scan tool, select View DTCs. Is the DTC Active at this time? Yes Go to step 2 No Perform the INTERMITTENT CONDITION diagnostic procedure. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
2. VISUAL INSPECTION NOTE: Anything that affects the speed of the crankshaft can cause a misfire DTC. NOTE: When a Misfire is detected for a particular cylinder, the PCM will shut down that cylinder's Injector Control circuit. Visually inspect the engine for any of the following conditions: Worn serpentine belt Binding Engine-Driven accessories: A/C Compressor, P/S Pump, Water pump. Misalignment of the Water pump, P/S Pump and A/C Compressor pulleys Corroded PCM power and ground circuits. Improper CKP, CMP, MAP and TP Sensor mounting Poor connector/terminal to component connection. i.e., CKP sensor, Fuel Injector, Ignition coil, etc. Vacuum leaks Restricted Air Induction system or Exhaust system. Internal engine component failures. Were any of the above conditions present? Yes Repair as necessary. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 3
3. (A955) ASD RELAY OUTPUT CIRCUIT Turn the ignition off. Disconnect the No. 7 Ignition Coil harness connector. Disconnect the No. 7 Fuel Injector harness connector. Ignition on, engine not running. Using a 12-volt test light connected to ground, probe the (A955) ASD Relay Output circuit in the Ignition Coil harness connector and Fuel Injector harness connector while the relay is actuating. NOTE: Make sure the test light is probing the circuit before actuating the Relay or a DTC may set and not allow the actuation. With the scan tool, actuate the ASD Relay. Does the test light illuminate brightly? Yes Go to step 4 No Repair the excessive resistance or short to ground in the (A955) ASD Relay Output circuit. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
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 may result in possible serious or fatal injury. Turn the ignition off. Connect the Ignition Coil No. 7 harness connector. Remove the Ignition Coil. Leave the Fuel Injector harness connector of the cylinder being tested disconnected. Install a spark tester on the Ignition Coil. While cranking the engine observe the spark coming from the spark tester. If an ignition wire exists, perform the same test on the ignition wire side of the Ignition Coil. NOTE: A crisp blue spark that is able to jump the gap of the spark tester should be generated at the coil on plug and at the end of the ignition wire. Is good spark present? Yes Go to step 5 No Go to step 14 NOTE: Connect the Fuel Injector harness connector before continuing.
5. SPARK PLUG CAUTION: The 4.7L engine uses TWO DIFFERENT types of spark plugs. A total of 16 plugs are used. The plugs are mounted in two rows (banks). The upper row is used on the intake valve side of the cylinder head. The lower row is used on the exhaust valve side of the cylinder head. The upper row uses Nickel Yttrium plugs. The lower row uses Iridium plugs. DO NOT INTERCHANGE THESE PLUGS. Turn the ignition off. Remove the Spark Plug(s) in accordance with the Service Information. Inspect the Spark Plug(s) 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 in accordance with the Service Information. Refer to «Electrical/Ignition Control/SPARK PLUG - Removal»(ref-352658-S03762488782010010600000) Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 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 possible serious or fatal injury. 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 may result in possible serious or fatal injury. Install the Fuel Pressure Decay Tester 8978A 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 step 7 Below Specification Go to step 12 Above Specification Replace the fuel filter/pressure regulator. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
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 possible serious or fatal injury. Turn the ignition off. Install the Fuel Pressure Decay Tester 8978A. 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). Close the Fuel System Isolation Valve and then wait five minutes before proceeding. Read the Fuel Inlet and Fuel Outlet Pressure Gauges. The pressure should not drop more than 10 psi on either gauge. Monitor the fuel pressure gauge for a minimum of five minutes. NOTE: The pressure should not decrease by greater than 69 kPa (10 psi) Does the pressure fall below the listed specification? Yes - On Fuel Inlet Gauge Replace the fuel pump module. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . Yes - On Fuel Outlet Gauge Replace the leaking fuel injector(s). Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 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 possible serious or fatal injury. CAUTION: After each Fuel Injector actuation, start the engine to clean the cylinder of fuel. Failure to do so could cause engine damage. Remove Hose Clamp Pliers C4390. Start the engine and allow the fuel pressure to reach maximum pressure. 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. Clear the DTC before continuing. Using the scan tool, actuate the No. 7 Fuel Injector. Monitor the fuel pressure gauge. Does the fuel pressure gauge indicate a drop in fuel pressure? Yes Go to step 9 No Go to step 10 NOTE: Turn the ignition off, remove the Fuel Pressure gauge and connect the fuel lines before continuing.
9. ENGINE MECHANICAL PROBLEM 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 the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 17
10. FUEL INJECTOR Turn the ignition off. Disconnect the No. 7 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 Replace the Fuel Injector. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 11
11. (K26) INJECTOR CONTROL NO. 7 CIRCUIT Turn the ignition off. Disconnect the C1 PCM harness connector. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install PCM Pinout Box 8815 to perform diagnosis. Check the (K26) Injector Control No. 7 circuit for an open, short to ground and short to voltage. Was a problem found with the (K26) Injector Control No. 7 circuit? Yes Repair the excessive resistance or short in the (K26) Injector Control No. 7 circuit. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 17
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 possible serious or fatal injury. Turn the ignition off. Raise vehicle on hoist and disconnect the fuel pressure line at the fuel pump module. Install fuel line adapter 6539 (5/16") or 6631(3/8") 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 the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 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 possible serious or fatal injury. 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 the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . 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 the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
14. IGNITION WIRE NOTE: If the vehicle being tested does not have an ignition wire, answer YES to this test and continue. Turn the ignition off. Remove the ignition wire. Measure the resistance of the ignition wire. Is the resistance below 10K Ohms? Yes Go to step 15 No Replace the Ignition Wire. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
15. 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 may result in possible serious or fatal injury. Disconnect the No. 7 Ignition Coil harness connector. Remove the Fuel Pump Relay. Using a 12-volt test light connected to 12-volts, probe the (K97) Coil Control No. 7 circuit. NOTE: Make sure the test light is probing the circuit before actuating the Ignition Coil or a DTC may set and not allow the actuation. Crank the engine for five seconds while observing the test light. NOTE: The primary resistance of the 4.7L Ignition coil is 0.6 to 0.9 of an Ohm at 25°C (77°F). 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 in accordance with the Service Information. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 16
16. (K97) COIL CONTROL NO. 7 CIRCUIT Turn the ignition off. Disconnect the C1 PCM harness connector. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install PCM Pinout Box 8815 to perform diagnosis. Check the (K97) Coil Control No. 7 circuit for an open, short to ground and short to voltage. Was a problem found with the (K97) Coil Control No. 7 circuit? Yes Repair the (K97) Coil Control No. 7 circuit. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 17
17. POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the related Sensors, Ignition Coil, Fuel 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, Ignition Coil, Fuel Injector and Powertrain Control Module connectors. Perform any Technical Service Bulletins that may apply. Were there any problems found? Yes Repair as necessary. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Replace and program the Powertrain Control Module in accordance with the Service Information. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .

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. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .

Scheme 162

Scheme 163

Scheme 164

1. ACTIVE DTC 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 may result in possible serious or fatal injury. 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 the scan tool, select View DTCs. Is the DTC Active at this time? Yes Go to step 2 No Perform the INTERMITTENT CONDITION diagnostic procedure. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
2. VISUAL INSPECTION NOTE: Anything that affects the speed of the crankshaft can cause a misfire DTC. NOTE: When a Misfire is detected for a particular cylinder, the PCM will shut down that cylinders Injector Control circuit. Visually inspect the engine for any of the following conditions: Worn serpentine belt Binding Engine-Driven accessories: A/C Compressor, P/S Pump, Water pump. Misalignment of the Water pump, P/S Pump and A/C Compressor pulleys Corroded PCM power and ground circuits. Improper CKP, CMP, MAP and TP Sensor mounting Poor connector/terminal to component connection. i.e., CKP sensor, Fuel Injector, Ignition coil, etc. Vacuum leaks Restricted Air Induction system or Exhaust system. Internal engine component failures. Were any of the above conditions present? Yes Repair as necessary. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 3
3. (A955) ASD RELAY OUTPUT CIRCUIT Turn the ignition off. Disconnect the No. 8 Ignition Coil harness connector. Disconnect the No. 8 Fuel Injector harness connector. Ignition on, engine not running. Using a 12-volt test light connected to ground, probe the (A955) ASD Relay Output circuit in the Ignition Coil harness connector and Fuel Injector harness connector while the relay is actuating. NOTE: Make sure the test light is probing the circuit before actuating the Relay or a DTC may set and not allow the actuation. With the scan tool, actuate the ASD Relay. Does the test light illuminate brightly? Yes Go to step 4 No Repair the excessive resistance or short to ground in the (A955) ASD Relay Output circuit. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
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 may result in possible serious or fatal injury. Turn the ignition off. Connect the Ignition Coil No. 8 harness connector. Remove the Ignition Coil. Leave the Fuel Injector harness connector of the cylinder being tested disconnected. Install a spark tester on the Ignition Coil. While cranking the engine observe the spark coming from the spark tester. If an ignition wire exists, perform the same test on the ignition wire side of the Ignition Coil. NOTE: A crisp blue spark that is able to jump the gap of the spark tester should be generated at the coil on plug and at the end of the ignition wire. Is good spark present? Yes Go to step 5 No Go to step 14 NOTE: Connect the Fuel Injector harness connector before continuing.
5. SPARK PLUG CAUTION: The 4.7L engine uses TWO DIFFERENT types of spark plugs. A total of 16 plugs are used. The plugs are mounted in two rows (banks). The upper row is used on the intake valve side of the cylinder head. The lower row is used on the exhaust valve side of the cylinder head. The upper row uses Nickel Yttrium plugs. The lower row uses Iridium plugs. DO NOT INTERCHANGE THESE PLUGS. Turn the ignition off. Remove the Spark Plug(s) in accordance with the Service Information. Inspect the Spark Plug(s) 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 in accordance with the Service Information. Refer to «Electrical/Ignition Control/SPARK PLUG - Removal»(ref-352658-S03762488782010010600000) Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 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 possible serious or fatal injury. 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 may result in possible serious or fatal injury. Install the Fuel Pressure Decay Tester 8978A 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 step 7 Below Specification Go to step 12 Above Specification Replace the fuel filter/pressure regulator. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
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 possible serious or fatal injury. Turn the ignition off. Install the Fuel Pressure Decay Tester 8978A. 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). Close the Fuel System Isolation Valve and then wait five minutes before proceeding. Read the Fuel Inlet and Fuel Outlet Pressure Gauges. The pressure should not drop more than 10 psi on either gauge. Monitor the fuel pressure gauge for a minimum of five minutes. NOTE: The pressure should not decrease by greater than 69 kPa (10 psi) Does the pressure fall below the listed specification? Yes - On Fuel Inlet Gauge Replace the fuel pump module. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . Yes - On Fuel Outlet Gauge Replace the leaking fuel injector(s). Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 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 possible serious or fatal injury. CAUTION: After each Fuel Injector actuation, start the engine to clean the cylinder of fuel. Failure to do so could cause engine damage. Remove Hose Clamp Pliers C4390. Start the engine and allow the fuel pressure to reach maximum pressure. Ignition on, engine not running. NOTE: When a Misfire is detected for a particular cylinder, the PCM will shut down that cylinders Injector Control circuit. Clear the DTC before continuing. Using the scan tool, actuate the No. 8 Fuel Injector. Monitor the fuel pressure gauge. Does the fuel pressure gauge indicate a drop in fuel pressure? Yes Go to step 9 No Go to step 10 NOTE: Turn the ignition off, remove the Fuel Pressure gauge and connect the fuel lines before continuing.
9. ENGINE MECHANICAL PROBLEM 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 the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 17
10. FUEL INJECTOR Turn the ignition off. Disconnect the No. 8 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 Replace the Fuel Injector. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 11
11. (K28) INJECTOR CONTROL NO. 8 CIRCUIT Turn the ignition off. Disconnect the C1 PCM harness connector. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install PCM Pinout Box 8815 to perform diagnosis. Check the (K28) Injector Control No. 8 circuit for an open, short to ground and short to voltage. Was a problem found with the (K28) Injector Control No. 8 circuit? Yes Repair the excessive resistance or short in the (K28) Injector Control No. 8 circuit. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 17
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 possible serious or fatal injury. Turn the ignition off. Raise vehicle on hoist and disconnect the fuel pressure line at the fuel pump module. Install fuel line adapter 6539 (5/16") or 6631(3/8") 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 the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 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 possible serious or fatal injury. 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 the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . 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 the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
14. IGNITION WIRE NOTE: If the vehicle being tested does not have an ignition wire, answer YES to this test and continue. Turn the ignition off. Remove the ignition wire. Measure the resistance of the ignition wire. Is the resistance below 10K Ohms? Yes Go to step 15 No Replace the Ignition Wire. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
15. 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 may result in possible serious or fatal injury. Disconnect the No. 8 Ignition Coil harness connector. Remove the Fuel Pump Relay. Using a 12-volt test light connected to 12-volts, probe the (K98) Coil Control No. 8 circuit. NOTE: Make sure the test light is probing the circuit before actuating the Ignition Coil or a DTC may set and not allow the actuation. Crank the engine for five seconds while observing the test light. NOTE: The primary resistance of the 4.7L Ignition coil is 0.6 to 0.9 of an Ohm at 25°C (77°F). 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 in accordance with the Service Information. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 16
16. (K98) COIL CONTROL NO. 8 CIRCUIT Turn the ignition off. Disconnect the C1 PCM harness connector. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install PCM Pinout Box 8815 to perform diagnosis. Check the (K98) Coil Control No. 8 circuit for an open, short to ground and short to voltage. Was a problem found with the (K98) Coil Control No. 8 circuit? Yes Repair the (K98) Coil Control No. 8 circuit. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 17
17. POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the related Sensors, Ignition Coil, Fuel 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, Ignition Coil, Fuel Injector and Powertrain Control Module connectors. Perform any Technical Service Bulletins that may apply. Were there any problems found? Yes Repair as necessary. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Replace and program the Powertrain Control Module in accordance with the Service Information. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .

Scheme 165

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. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .

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 Conditions: The Powertrain Control Module (PCM) detects that the Knock Sensor input voltage is: Above 4.0 Volts, less than or equal to 1.0 Volt with engine RPM at or above 2200 or equal to 0.0 Volts with engine RPM below 2200. Two Trip Fault. Three good trips to turn off the MIL.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .

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 the 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 step 2 No Perform the INTERMITTENT CONDITION diagnostic procedure. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
2. (K42) KNOCK SENSOR NO. 1 SIGNAL 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) Knock Sensor No. 1 Signal circuit in the Knock Sensor harness connector. Is there any voltage present? Yes Repair the short to voltage in the (K42) Knock Sensor No. 1 Signal circuit. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 3
3. (K42) KNOCK SENSOR NO. 1 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 PCM Pinout Box 8815 to perform diagnosis. Measure the resistance of the (K42) Knock Sensor No. 1 Signal circuit from the Knock Sensor harness connector to the appropriate terminal of PCM Pinout Box 8815. Is the resistance below 5.0 Ohms? Yes Go to step 4 No Repair the open in the (K42) Knock Sensor No. 1 Signal circuit. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
4. (K942) KNOCK SENSOR NO. 1 RETURN CIRCUIT OPEN Measure the resistance of the (K942) Knock Sensor No. 1 Return circuit from the Knock Sensor harness connector to the appropriate terminal of PCM Pinout Box 8815. Is the resistance below 5.0 Ohms? Yes Go to step 5 No Repair the open in the (K942) Knock Sensor No. 1 Return circuit. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
5. (K42) KNOCK SENSOR NO. 1 SIGNAL SHORTED TO THE (K942) KNOCK SENSOR NO. 1 RETURN CIRCUIT Measure the resistance between the (K42) Knock Sensor No. 1 Signal circuit and the (K942) Knock Sensor No. 1 Return circuit in the Knock Sensor harness connector. Is the resistance below 100 Ohms? Yes Repair the short between the (K42) Knock Sensor No. 1 Signal circuit and the (K942) Knock Sensor No. 1 Return circuit. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 6
6. (K42) KNOCK SENSOR NO. 1 SIGNAL SHORTED TO GROUND Measure the resistance between ground and the (K42) Knock Sensor No. 1 Signal circuit in the Knock Sensor harness connector. Is the resistance below 100 Ohms? Yes Repair the short to ground in the (K42) Knock Sensor No. 1 Signal circuit. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 7
7. KNOCK SENSOR 1 Turn the ignition off. 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 may result in possible serious or fatal injury. 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 step 8 No Test complete. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
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. Perform any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Replace and program the Powertrain Control Module (PCM) in accordance with the Service Information. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .

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 Conditions: The Powertrain Control Module (PCM) detects that the Knock Sensor input voltage is: Above 4.0 Volts, less than or equal to 1.0 Volt with engine RPM at or above 2200 or equal to 0.0 Volts with engine RPM below 2200. Two Trip Fault. Three good trips to turn off the MIL.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .

Scheme 171

Scheme 172

Scheme 173

Scheme 174

Scheme 175

1. ACTIVE DTC Start the engine. Allow the engine to reach normal operating temperature. With the 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 step 2 No Perform the INTERMITTENT CONDITION diagnostic procedure. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
2. (K242) KNOCK SENSOR NO. 2 SIGNAL 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) Knock Sensor No. 2 Signal circuit in the Knock Sensor harness connector. Is there any voltage present? Yes Repair the short to voltage in the (K242) Knock Sensor No. 2 Signal circuit. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 3
3. (K242) KNOCK SENSOR NO. 2 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 PCM Pinout Box 8815 to perform diagnosis. Measure the resistance of the (K242) Knock Sensor No. 2 Signal circuit from the Knock Sensor harness connector to the appropriate terminal of PCM Pinout Box 8815. Is the resistance below 5.0 Ohms? Yes Go to step 4 No Repair the open in the (K242) Knock Sensor No. 2 Signal circuit. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
4. (K924) KNOCK SENSOR NO. 2 RETURN CIRCUIT OPEN Measure the resistance of the (K924) Knock Sensor No. 2 Return circuit from the Knock Sensor harness connector to the appropriate terminal of PCM Pinout Box 8815. Is the resistance below 5.0 Ohms? Yes Go to step 5 No Repair the open in the (K924) Knock Sensor No. 2 Return circuit. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
5. (K242) KNOCK SENSOR NO. 2 SIGNAL SHORTED TO THE (K924) KNOCK SENSOR NO. 2 RETURN CIRCUIT Measure the resistance between the (K242) Knock Sensor No. 2 Signal circuit and the (K924) Knock Sensor No. 2 Return circuit in the Knock Sensor harness connector. Is the resistance below 100 Ohms? Yes Repair the short between the (K242) Knock Sensor No. 2 Signal circuit and the (K924) Knock Sensor No. 2 Return circuit. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 6
6. (K242) KNOCK SENSOR NO. 2 SIGNAL SHORTED TO GROUND Measure the resistance between ground and the (K242) Knock Sensor No. 2 Signal circuit in the Knock Sensor harness connector. Is the resistance below 100 Ohms? Yes Repair the short to ground in the (K242) Knock Sensor No. 2 Signal circuit. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 7
7. KNOCK SENSOR 2 Turn the ignition off. 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 may result in possible serious or fatal injury. 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 step 8 No Test complete. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
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. Perform any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Replace and program the Powertrain Control Module (PCM) in accordance with the Service Information. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .

1. When Monitored: Engine cranking.

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

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .

Scheme 176

Scheme 177

Scheme 178

Scheme 179

Scheme 180

Scheme 181

Scheme 182

Scheme 183

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 may result in possible serious or fatal injury. 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 step 2 No Go to step 14
2. (F855) 5-VOLT SUPPLY CIRCUIT Turn the ignition off. Disconnect the CKP Sensor harness connector. Ignition on, engine not running. Measure the voltage on the (F855) 5-volt Supply circuit in the CKP Sensor harness connector. Is the voltage between 4.5 and 5.02 volts? Yes Go to step 3 No Go to step 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 step 4 No Go to step 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 PCM Pinout Box 8815 to perform diagnosis. Measure the resistance of the (K900) Sensor ground circuit from the CKP Sensor harness connector to the appropriate terminal of PCM Pinout Box 8815. Is the resistance below 5.0 Ohms? Yes Go to step 5 No Repair the open in the (K900) Sensor ground circuit. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
5. (K24) CKP SIGNAL CIRCUIT SHORTED TO THE (F855) 5-VOLT SUPPLY CIRCUIT Measure the resistance between the (K24) CKP Signal circuit and the (F855) 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 (F855) 5-volt Supply circuit. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 6
6. CRANKSHAFT POSITION SENSOR NOTE: Inspect the slots on the flywheel for damage. If a problem is found repair as necessary. Repair Verify that there is good pin to terminal contact in the CKP Sensor and Powertrain Control Module connectors. Replace the Crankshaft Position Sensor if no problems were found in the connectors. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
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 the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 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 PCM Pinout Box 8815 to perform diagnosis. Measure the resistance of the (K24) CKP Signal circuit from the CKP Sensor harness connector to the appropriate terminal of PCM Pinout Box 8815. Is the resistance below 5.0 Ohms? Yes Go to step 9 No Repair the open in the (K24) CKP Signal circuit. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
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 the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 13
10. (F855) 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 (F855) 5-volt Supply circuit in the CKP Sensor harness connector. Is there any voltage present? Yes Repair the short to voltage in the (F855) 5-volt Supply circuit. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 11
11. (F855) 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 PCM Pinout Box 8815 to perform diagnosis. Measure the resistance of the (F855) 5-volt Supply circuit from the CKP Sensor harness connector to the appropriate terminal of PCM Pinout Box 8815. Is the resistance below 5.0 Ohms? Yes Go to step 12 No Repair the open in the (F855) 5-volt Supply circuit. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
12. (F855) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND Measure the resistance between ground and the (F855) 5-volt Supply circuit in the CKP Sensor harness connector. Is the resistance below 100 Ohms? Yes Repair the short to ground in the (F855) 5-volt Supply circuit. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 13
13. POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the CKP 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 CKP Sensor and Powertrain Control Module connectors. Perform any Technical Service Bulletins that may apply. Were there any problems found? Yes Repair as necessary. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Replace and program the Powertrain Control Module in accordance with the Service Information. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
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 may result in possible serious or fatal injury. 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 Inspect the related wire harness and replace the Crankshaft Position Sensor if no wiring problems were found. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 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 may result in possible serious or fatal injury. 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 Inspect the related wire harness and replace the Camshaft Position Sensor if no wiring problems were found. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Test Complete, the conditions that set this DTC are not present at this time.

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

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. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .

Scheme 184

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 may result in possible serious or fatal injury. 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 step 2 No Perform the INTERMITTENT CONDITION diagnostic procedure. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
2. CHECKING CRANKSHAFT POSITION SENSOR SIGNAL WITH A LAB SCOPE Turn the ignition off. With a lab scope probe and the Miller special tool 6801, backprobe the (K24) CKP Signal circuit in the Sensor 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 may result in possible serious or fatal injury. Ignition on, engine not running. Observe the lab scope screen. Start the engine. Observe the lab scope screen. Are there any irregular or missing signals? Yes Go to step 3 No Go to step 8
3. WIRE HARNESS INSPECTION Turn the ignition off. Visually inspect the related wire harness including the ground circuit. Look for any chafed, pierced, pinched, or partially broken wires. Visually inspect the related wire harness connectors. Look for broken, bent, pushed out, or corroded terminals. Make sure the Crankshaft Position Sensor and the Camshaft Position Sensor are properly installed and the mounting bolt(s) are torqued to the proper specification. Refer to any TSBs that may apply. Were any of the above conditions present? Yes Repair as necessary. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 4
4. (F855) 5-VOLT SUPPLY CIRCUIT OPEN OR SHORTED TO GROUND Disconnect the CKP Sensor connector. Ignition on, engine not running. Measure the voltage on the (F855) 5-volt Supply circuit in the Sensor harness connector. Is the voltage between 4.5 and 5.02 volts? Yes Go to step 5 No Repair the open or short to ground in the (F855) 5-volt Supply circuit. Use Miller PCM Pinout Box 8815 when checking for an open circuit to prevent PCM harness connector terminal damage. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
5. TONE WHEEL/FLEX PLATE INSPECTION Turn the ignition off. Carefully disconnect the Negative Battery (Ground) cable. Remove the Crankshaft Position Sensor. Inspect the Tone Wheel/Flex Plate slots for damage, foreign material, or excessive movement. Were any problems found? Yes Repair or replace the Tone Wheel/Flex Plate as necessary. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 6
6. CHECKING CAMSHAFT POSITION SENSOR SIGNAL WITH A LAB SCOPE Install the CKP Sensor and connect the battery cable. NOTE: An intermittent condition in the Cam Position Sensor can cause the P0339 to set. With the a lab scope probe and the Miller special tool #6801, backprobe the (K44) CMP Signal circuit in the Sensor 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 may result in possible serious or fatal injury. Ignition on, engine not running. Wiggle the related wire harness and lightly tap on the Cam Position Sensor. Observe the lab scope screen. Start the engine. Observe the lab scope screen. Are there any irregular or missing signals? Yes Verify that there is good pin to terminal contact in the CMP Sensor and Powertrain Control Module connectors. Replace the Cam Position Sensor if no problems were found in the connectors. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 7
7. CRANKSHAFT POSITION SENSOR Repair Verify that there is good pin to terminal contact in the CKP Sensor and Powertrain Control Module connectors. Replace the Crankshaft Position Sensor if no problems were found in the connectors. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
8. (K24) CKP SIGNAL CIRCUIT SHORTED TO VOLTAGE Turn the ignition off. Disconnect the C2 PCM harness connector. Disconnect the CKP Sensor harness connector. Ignition on, engine not running. Measure the voltage on the (K24) CKP Signal circuit in the Sensor harness connector. Wiggle the related wire harness while taking this measurement. Is there any voltage present? Yes Repair the short to voltage in the (K24) CKP Signal circuit. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 9
9. (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 PCM Pinout Box 8815 to perform diagnosis. Measure the resistance in the (K24) CKP Signal circuit from the CKP harness connector to the appropriate terminal of the PCM Pinout Box 8815. Wiggle the wire harness while taking this measurement. Is the resistance below 1.0 Ohm? Yes Go to step 10 No Repair the excessive resistance in the (K24) CKP Signal circuit. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
10. (K24) CKP SIGNAL CIRCUIT SHORTED TO GROUND Measure the resistance between ground and the (K24) CKP Signal circuit in the CKP Sensor harness connector. Wiggle the related wire harness while monitoring the resistance value. Does the resistance ever drop below 100 Ohms? Yes Repair the short to ground in the (K24) Signal circuit. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 11
11. (K24) CKP SIGNAL CIRCUIT SHORTED TO THE (F855) 5-VOLT SUPPLY CIRCUIT Measure the resistance between the (F855) 5-volt Supply circuit and the (K24) CKP Signal circuit in the CKP harness connector. Wiggle the related wire harness while taking this measurement. Is the resistance below 5.0 Ohms? Yes Repair the short between the (F855) 5-volt Supply circuit and the (K24) CKP Signal circuit. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 12
12. POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the CKP 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 CKP Sensor and Powertrain Control Module connectors. Perform any Technical Service Bulletins that may apply. Were there any problems found? Yes Repair as necessary. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Replace and program the Powertrain Control Module in accordance with the Service Information. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .

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. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .

Scheme 185

Scheme 186

Scheme 187

Scheme 188

Scheme 189

Scheme 190

Scheme 191

Scheme 192

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 may result in possible serious or fatal injury. 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 step 2 No Go to step 14
2. (F856) 5-VOLT SUPPLY CIRCUIT Turn the ignition off. Disconnect the CMP Sensor harness connector. Ignition on, engine not running. Measure the voltage on the (F856) 5-volt Supply circuit in the CMP Sensor harness connector. Is the voltage between 4.5 and 5.02 volts? Yes Go to step 3 No Go to step 10
3. (K44) CMP SIGNAL CIRCUIT Measure the voltage on the (K44) CMP Signal circuit in the CMP 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 step 4 No Go to step 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 PCM Pinout Box 8815 to perform diagnosis. Measure the resistance of the (K900) Sensor ground circuit from the CMP Sensor harness connector to the appropriate terminal of PCM Pinout Box 8815. Is the resistance below 5.0 Ohms? Yes Go to step 5 No Repair the open in the (K900) Sensor ground circuit. Perform POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
5. (K44) CMP SIGNAL SHORTED TO THE (F856) 5-VOLT SUPPLY CIRCUIT Disconnect the C1 PCM harness connector. Measure the resistance between the (K44) CMP Signal circuit and the (F856) 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 (F856) 5-volt Supply circuit. Perform POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 6
6. CAMSHAFT POSITION SENSOR NOTE: Inspect the Camshaft sprocket for damage in accordance with the Service Information. If a problem is found repair as necessary. Repair 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 in the connectors. Perform POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
7. (K44) CMP SIGNAL CIRCUIT SHORTED TO VOLTAGE Turn the ignition off. Disconnect the C1 and C2 PCM harness connectors. 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. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 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 PCM Pinout Box 8815 to perform diagnosis. Measure the resistance of the (K44) CMP Signal circuit from the CMP Sensor harness connector to the appropriate terminal of PCM Pinout Box 8815. Is the resistance below 5.0 Ohms? Yes Go to step 9 No Repair the open in the (K44) CMP Signal circuit. Perform POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
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. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 10
10. (F856) 5-VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE Ignition on, engine not running. Measure the voltage on the (F856) 5-volt Supply circuit in the CMP Sensor harness connector. Is there any voltage present? Yes Repair the short to voltage in the (F856) 5-volt Supply circuit. Perform POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 11
11. (F856) 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 PCM Pinout Box 8815 to perform diagnosis. Measure the resistance of the (F856) 5-volt Supply circuit between the CMP Sensor harness connector to the appropriate terminal of PCM Pinout Box 8815. Is the resistance below 5.0 Ohms? Yes Go to step 12 No Repair the open in the (F856) 5-volt Supply circuit. Perform POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
12. (F856) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND Measure the resistance between ground and the (F856) 5-volt Supply circuit in the CMP Sensor harness connector. Is the resistance below 100 Ohms? Yes Repair the short to ground in the (F856) 5-volt Supply circuit. Perform POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 13
13. POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the CMP 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 CMP Sensor and Powertrain Control Module connectors. Perform any Technical Service Bulletins that may apply. Were there any problems found? Yes Repair as necessary. Perform POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) No Replace and program the Powertrain Control Module in accordance with the Service Information. Perform POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
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 may result in possible serious or fatal injury. 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 Powertrain Control Module connectors. Replace the Camshaft Position Sensor if no problems were found in the connectors. Perform POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 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 may result in possible serious or fatal injury. 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 Powertrain Control Module connectors. Replace the Crankshaft Position Sensor if no problems were found in the connectors. Perform POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Test Complete, the conditions that set this DTC are not present at this time.

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. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .

Scheme 193

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 may result in possible serious or fatal injury. 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 step 2 No Perform the INTERMITTENT CONDITION diagnostic procedure. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
2. CHECKING CAMSHAFT POSITION SENSOR SIGNAL WITH A LAB SCOPE 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 may result in possible serious or fatal injury. Ignition on, engine not running. Observe the lab scope screen. Start the engine. Observe the lab scope screen. Are there any irregular or missing signals? Yes Go to step 3 No Go to step 8
3. WIRE HARNESS INSPECTION Turn the ignition off. Visually inspect the related wire harness including the ground circuit. Look for any chafed, pierced, pinched, or partially broken wires. Verify that there is good pin to terminal contact in the CMP Sensor and Powertrain Control Module connectors. Visually inspect the related wire harness connectors. Look for broken, bent, pushed out, or corroded terminals. Make sure the Crankshaft Position Sensor and the Camshaft Position Sensor are properly installed and the mounting bolt(s) are torqued to the proper specification. Refer to any TSBs that may apply. Were any of the above conditions present? Yes Repair as necessary. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 4
4. (F856) 5-VOLT SUPPLY CIRCUIT OPEN OR SHORTED TO GROUND Disconnect the CMP Sensor connector. Ignition on, engine not running. Measure the voltage on the (F856) 5-volt Supply circuit in the CMP harness connector. Is the voltage between 4.5 and 5.02 volts? Yes Go to step 5 No Repair the open or short to ground in the (F856) 5-volt Supply circuit. Use Miller PCM Pinout Box 8815 when checking for an open circuit to prevent PCM harness connector terminal damage. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
5. TONE WHEEL/PULSE RING INSPECTION Turn the ignition off. Carefully disconnect the Battery Ground cable. Remove the Camshaft Position Sensor. Inspect the Tone Wheel/Pulse Ring for damage, foreign material, or excessive movement. Were any problems found? Yes Repair or replace the Tone Wheel/Pulse Ring as necessary. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 6
6. CHECKING CRANKSHAFT POSITION SENSOR SIGNAL WITH A LAB SCOPE NOTE: An intermittent condition in the Crank Position Sensor can cause the P0344 to set. Install the CMP Sensor and connect the Battery cable. 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 may result in possible serious or fatal injury. Ignition on, engine not running. Wiggle the related wire harness and lightly tap on the Crank Position Sensor. Observe the lab scope screen. Start the engine. Observe the lab scope screen. Are there any irregular or missing signals? Yes Verify that there is good pin to terminal contact in the CKP Sensor and Powertrain Control Module connectors. Replace the Crank Position Sensor if no problems were found in the connectors. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 7
7. CAMSHAFT POSITION SENSOR Repair 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 in the connectors. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
8. (K44) CMP SIGNAL CIRCUIT SHORTED TO VOLTAGE Turn the ignition off. Disconnect the CMP Sensor connector. Disconnect the C1 and C2 PCM harness connectors. Ignition on, engine not running. Measure the voltage on the (K44) CMP Signal circuit. Wiggle the related wire harness while taking this measurement. Is there voltage present? Yes Repair the short to voltage in the (K44) CMP Signal circuit. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 9
9. (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 PCM Pinout Box 8815 to perform diagnosis. Measure the resistance in the (K44) CMP Signal circuit from the CMP harness connector to the appropriate terminal of PCM Pinout Box 8815. Wiggle the related wire harness while taking this measurement. Is the resistance below 5.0 Ohms? Yes Go to step 10 No Repair the excessive resistance in the (K44) CMP Signal circuit. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
10. (K44) CMP SIGNAL CIRCUIT SHORTED TO GROUND Measure the resistance between ground and the (K44) CMP Signal circuit in the CMP Sensor harness connector. Wiggle the related wire harness while monitoring the resistance value. Does the resistance ever drop below 100 Ohms? Yes Repair the short to ground in the (K44) CMP Signal circuit. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 11
11. (K44) CMP SIGNAL CIRCUIT SHORTED TO THE (F856) 5-VOLT SUPPLY CIRCUIT Measure the resistance between the (F856) 5-volt Supply circuit and the (K44) CMP Signal circuit in the CMP harness connector. Wiggle the related wire harness while taking this measurement. Is the resistance below 5.0 Ohms? Yes Repair the short between the (F856) 5-volt Supply circuit and the (K44) CMP Signal circuit. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 12
12. POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the CMP 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 CMP Sensor and Powertrain Control Module connectors. Perform any Technical Service Bulletins that may apply. Were there any problems found? Yes Repair as necessary. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Replace and program the Powertrain Control Module in accordance with the Service Information. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .

Scheme 194

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. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .

Scheme 195

Scheme 196

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 may result in possible serious or fatal injury. 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 step 2 No Refer to the INTERMITTENT CONDITION Diagnostic Procedure. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000)
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 may result in possible serious or fatal injury. Does the engine run rough or stall at idle? Yes Go to step 3 No Go to step 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 may result in possible serious or fatal injury. Does the engine continue to run rough or stall with the EGR Valve Assembly connector disconnected? Yes Go to step 8 No Go to step 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 the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Go to step 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 may result in possible serious or fatal injury. 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 step 8 No Go to step 6
6. (Z958) EGR SOLENOID GROUND CIRCUIT OPEN Turn the ignition off. Using a 12-volt test light connected to battery voltage, probe the (Z958) EGR Solenoid ground circuit in the EGR Solenoid harness connector. Does the 12-volt test light illuminate brightly? Yes Go to step 7 No Repair the open in the (Z958) EGR Solenoid ground circuit. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
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 the PCM Pinout Box 8815 along with the Adapter 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 may result in possible serious or fatal injury. 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 step 8 No Repair the (K35) EGR Control circuit for excessive resistance. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
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. Failure to follow these instructions can result in possible serious or fatal injury. 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.
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 Powertrain Control Module connectors. Refer to any Technical Service Bulletins that may apply.

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. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .

Scheme 197

Scheme 198

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 Perform the INTERMITTENT CONDITION diagnostic procedure. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
2. (K35) EGR CONTROL CIRCUIT SHORTED TO VOLTAGE Turn the ignition off. Disconnect the EGR Valve Assembly connector. Disconnect the Powertrain Control Module (PCM) 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 (K35) EGR Control circuit for a short to voltage. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . 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 (K35) EGR Control circuit for a short to ground. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
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 PCM Pinout Box 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 PCM Pinout Box 8815. Is the resistance below 5.0 Ohms? Yes Go to 5 No Repair the (K35) EGR Control circuit for an open circuit or high resistance. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
5. (Z958) GROUND CIRCUIT OPEN OR HIGH RESISTANCE Using a 12-volt test light connected to 12 volts, check the (Z958) 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 (Z958) Ground circuit for an open circuit or high resistance. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
6. EGR VALVE ASSEMBLY Connect the Powertrain Control Module (PCM) 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 Powertrain Control Module connectors. Replace the EGR Valve Assembly in accordance with the Service Information if no problems were found in the connectors. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . 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 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 Powertrain Control Module connectors. Perform any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Replace and program the Powertrain Control Module (PCM) in accordance with the Service Information. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .

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 from the EGR Close Position Performance. Two trip fault.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .

Scheme 199

Scheme 200

Scheme 201

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 may result in possible serious or fatal injury. 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. Failure to follow these instructions can result in possible serious or fatal injury. 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 step 2 No Perform the INTERMITTENT CONDITION diagnostic procedure. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
2. (F856) 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 PCM Pinout Box 8815 along with the Adapter 8815-1 to perform the diagnosis. Using a voltmeter, perform a voltage drop test by backprobing the (F856) 5 Volt Supply circuit at the EGR Valve Assembly harness connector and probing the appropriate terminal of the PCM Pinout Box 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 may result in possible serious or fatal injury. Start the engine. Is the voltage below 0.5 of a volt? Yes Go to step 3 No Repair the (F856) 5 Volt Supply circuit for high resistance. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
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 PCM Pinout Box 8815 along with the Adapter 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 PCM Pinout Box 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 may result in possible serious or fatal injury. Start the engine. Is the voltage below 0.5 of a volt? Yes Go to step 4 No Repair the (K34) EGR Signal circuit for high resistance. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
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 PCM Pinout Box 8815 along with the Adapter 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 PCM Pinout Box 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 may result in possible serious or fatal injury. Start the engine. Is the voltage below 0.5 of a volt? Yes Go to step 5 No Repair the (K900) Sensor Ground circuit for high resistance. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
5. (Z958) 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 (Z958) 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 step 6 No Repair the (Z958) Ground circuit for an open circuit of high resistance. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
6. EXCESSIVE RESISTANCE IN THE (K35) EGR CONTROL CIRCUIT 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 PCM Pinout Box 8815 along with the Adapter 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 PCM Pinout Box 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 may result in possible serious or fatal injury. 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 of a volt when the valve was opened during the system test? Yes Go to step 7 No Repair the (K35) EGR Control circuit for excessive resistance. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .
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). Verify that there is good pin to terminal contact in the EGR Solenoid and Powertrain Control Module connectors. 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 Powertrain Control Module connectors. Perform any Technical Service Bulletins that may apply. Were any problems found? Yes Repair or replace the EGR system components as necessary. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) . No Replace the EGR Valve Assembly. Perform the POWERTRAIN VERIFICATION TEST. See «DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure»(ref-352681-S03115589192010010600000) .