Dtcs P0175 to P0315: Other Jeep Commander I

Monitor Conditions

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

Set Conditions

1. Set Condition: If the PCM multiplies short term compensation by long term adaptive and a purge fuel multiplier and the result is below a certain value for 30 seconds over two trips, a freeze frame is stored, the MIL illuminates and a trouble code is stored. Two Trip Fault. Three good trips to turn off the MIL.

Possible Causes

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

Scheme 145

Scheme 146

Scheme 147

1. 1) ACTIVE DTC NOTE: Check for contaminates that may have damaged an O2 Sensor: contaminated fuel, unapproved silicone, oil and coolant. Start the engine. Allow the engine to reach normal operating temperature. With a scan tool, select View DTCs. NOTE: It may be necessary to drive the vehicle to meet the conditions to set this DTC, try to repeat the conditions in which the fault originally set by reviewing the Freeze Frame data. Is the DTC Active or Pending at this time? Yes Go to 2) . No Refer to «INTERMITTENT CONDITION»(ref-288287-S02739760862008062000000) Diagnostic Procedure.
2. 2) CHECKING FUEL PRESSURE WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow these instructions can result in personal injury or death. Turn the ignition off. Install a fuel pressure gauge to the fuel rail. 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). Turn the ignition off. Choose a conclusion that best matches your fuel pressure reading. Within Specification Go to 3) . Above Specification Replace the fuel filter/pressure regulator. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . CAUTION: Stop All Actuations.
3. 3) O2 SENSOR OPERATION Start the engine. Allow the engine to reach normal operating temperature. NOTE: If one of the O2 Sensors Signal or Return circuit is shorted to ground or voltage, all the other O2 Sensor voltage readings will be affected. NOTE: After the repairs have been made, verify proper O2 Sensor operation. If all the O2 Sensor voltage readings have not returned to normal, follow the diagnostic procedure for the remaining O2 Sensors. With the scan tool, monitor the 2/1 O2 Sensor voltage reading. Is the voltage switching between 2.5 and 3.4 volts? Yes Go to 4) . No Go to 9) .
4. 4) 2/1 O2 SENSOR HEATER OPERATION Turn the ignition off. NOTE: Wait a minimum of 10 minutes to allow the O2 Sensor to cool down before continuing the test. Allow the O2 Sensor voltage to stabilize at 5.0 volts. Ignition on, engine not running. With the scan tool, perform the 2/1 O2 Heater Test for each O2 Sensor. With the scan tool, monitor the 2/1 O2 Sensor voltage while performing the Heater test for at least 2 minutes. Does the voltage stay above 4.5 volts for each Sensor? Yes Verify that there is good pin to terminal contact in the O2 Sensor and Powertrain Control Module connectors. Replace the 2/1 O2 Sensor if no problems were found with the connectors. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 5) .
5. 5) MAP SENSOR OPERATION Ignition on, engine not running. With a scan tool, read the Barometric Pressure. NOTE: The Barometric Pressure should be approximately equal to the actual barometric pressure. If necessary, compare the Barometric Pressure value of this vehicle to the value of a known good vehicle of a similar make and model. Turn the ignition off. Connect a Vacuum Gauge to a Manifold Vacuum source. Start the engine. Allow the engine to idle. NOTE: If engine will not idle, maintain a constant RPM above idle. With the scan tool, read the MAP Sensor vacuum value. Is the scan tool reading for MAP Vacuum within 1" of Hg on the Vacuum Gauge reading and is the Barometric Pressure reading of the vehicle the approximately the same as actual Barometric Pressure? Yes Go to 6) . No Verify that there is good pin to terminal contact in the MAP Sensor and Powertrain Control Module connectors. Replace the MAP Sensor if no problems were found with the connectors. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . NOTE: Remove the vacuum gauge before continuing.
6. 6) ECT SENSOR OPERATION NOTE: For this test to be valid, the thermostat must be operating correctly. NOTE: This test works best if performed on a cold engine (cold soak). Ignition on, engine not running. With the scan tool, read the Engine Coolant Temperature Sensor value. If the engine was allowed to sit overnight (cold soak), the temperature value should be a sensible value that is somewhere close to the ambient temperature. NOTE: If engine coolant temperature is above 82° C (180° F), allow the engine to cool until 65° C (150° F) is reached. Start the Engine. During engine warm-up, monitor the Engine Coolant Temperature value. The temp value change should be a smooth transition from start up to normal operating temp 82° C (180° F). The value should reach at least 82° C (180° F). Did the ECT value increase smoothly and reach at least 82° C (180° F)? Yes Go to 7) . No Verify that there is good pin to terminal contact in the ECT Sensor and Powertrain Control Module connectors. Replace the Engine Coolant Temperature Sensor if no problems were found with the connectors. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
7. 7) EVAP PURGE SOLENOID OPERATION Turn the ignition off. Disconnect the hoses at the Evap Purge Solenoid. Using a hand vacuum pump, apply 10 inches of vacuum to the Evap Purge Solenoid vacuum source port on the component side. Did the Evap Purge Solenoid hold vacuum? Yes Go to 8) . No Verify that there is good pin to terminal contact in the Evap Purge Solenoid and Powertrain Control Module connectors. Replace the Evap Purge Solenoid if no problems were found with the connectors. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . NOTE: Connect the vacuum hoses before continuing.
8. 8) ENGINE MECHANICAL Check for any of the following conditions/mechanical problems. AIR INDUCTION SYSTEM - must be free from restrictions. 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 FUEL INJECTOR - plugged or restricted injector; control wire not connected to correct injector Are there any engine mechanical problems? Yes Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 12) .
9. 9) 2/1 O2 SENSOR Ignition on, engine not running. Disconnect the 2/1 O2 Sensor harness connector. With the scan tool, monitor the 2/1 O2 Sensor voltage. O2 Sensor voltage should read between 4.1 and 5.0 volts on the scan tool with the connector disconnected. Connect a jumper wire between the (K43) O2 Sensor 2/1 Signal circuit and the (K902) O2 Return Upstream circuit in the O2 Sensor harness connector. NOTE: The voltage should drop from between 4.1 and 5.0 volts down to 2.5 volts with the jumper wire connected. Did the O2 Sensor voltage drop from between 4.1 and 5.0 volts to 2.5 volts when the jumper wire was installed? Yes Verify that there is good pin to terminal contact in the O2 Sensor and Powertrain Control Module connectors. Replace the 2/1 O2 Sensor if no problems were found with the connectors. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 10) . NOTE: Remove the jumper wire before continuing.
10. 10) O2 SENSOR SIGNAL CIRCUIT Measure the voltage on the (K43) O2 Sensor 2/1 Signal circuit in the O2 Sensor harness connector. Is the voltage between 4.1 and 5.0 volts? Yes Go to 11) . No Check the (K43) O2 Sensor 2/1 Signal circuit for damage, short to ground, open, or short to voltage. Inspect the O2 Sensor connector and the PCM harness connector. If OK, replace and program the Powertrain Control Module per Service Information. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
11. 11) (K902) O2 SENSOR RETURN UPSTREAM CIRCUIT Measure the voltage on the (K902) O2 Return Upstream circuit in the O2 Sensor harness connector. Is the voltage at 2.5 volts? Yes Go to 12) . No Check the (K902) O2 Return Upstream circuit for damage, short to ground, open, or short to voltage. Inspect the O2 Sensor connector and the PCM harness connector. If OK, replace and program the Powertrain Control Module per Service Information. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . NOTE: Turn the ignition off before continuing.
12. 12) POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Sensors 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 Sensor and Control Module connectors. Refer to any Technical Service Bulletins that may apply. Were there any problems found? Yes Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Replace and program the Powertrain Control Module per Service Information. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .

Scheme 148

1. When Monitored: With engine off time greater than 480 minutes and ambient temperature greater than -7° C (19.4° F).

1. Set Condition: After a calibrated amount of cool down time, the PCM compares the AAT, ECT, and IAT Sensor values. If the general temperature rationality passes, the PCM compares the Oil Temperature Sensor value to a threshold based on the other temp sensor values. If the difference is greater than a calibrated value, the diagnostic fails.

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

Scheme 149

1. 1) ACTIVE DTC Turn the ignition off. If possible, allow the vehicle to sit with the ignition off for more than 480 minutes in an environment where the temperature is consistent and above -7° C (19.4° F). Test drive the vehicle. The vehicle must exceed 48 km/h (30 mph) during the test drive. Do not cycle the ignition off when the test drive is completed. With a scan tool, select View DTCs. Is the status Active or Pending for this DTC? Yes Go to 3) . No Go to 2) .
2. 2) ENGINE OIL TEMPERATURE Turn the ignition off. Allow the vehicle to sit with the ignition off in an environment where the temperature is consistent and above -7° C (19.4° F) until the engine coolant temperature is equal to ambient temperature. Turn the ignition on. With a scan tool, compare the Engine Oil Temperature Sensor value to the AAT, ECT, and IAT sensor values. Is the Engine Oil Temperature Sensor value within 10° C (18° F) of the other sensor values? Yes Refer to «INTERMITTENT CONDITION»(ref-288287-S02739760862008062000000) Diagnostic Procedure. No Go to 3) .
3. 3) ENGINE OIL TEMPERATURE SENSOR VOLTAGE Turn the ignition off. Disconnect the Engine Oil Temperature Sensor harness connector. Turn the ignition on. With a scan tool, read the Engine Oil Temperature Sensor voltage. NOTE: The sensor voltage should be approximately 5.0 volts (plus or minus .1 volt) with the connector disconnected. Does the scan tool display the voltage as described above? Yes Go to 4) . No Go to 5) .
4. 4) ENGINE OIL TEMPERATURE SENSOR Turn the ignition on. With a scan tool, read the Engine Oil Temperature Sensor voltage. Connect a jumper wire between the (G224) EOT Signal circuit and the (K900) Sensor Ground circuit in the Engine Oil Temperature Sensor harness connector. NOTE: The sensor voltage should be approximately 0.0 volts (plus or minus .1 volt) with the jumper wire in place. Does the scan tool display the voltage as described above? Yes Replace the Engine Oil Temperature Sensor. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 5) .
5. 5) (G224) EOT SIGNAL CIRCUIT HIGH RESISTANCE Turn the ignition off. Connect the Engine Oil Temperature Sensor harness connector. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool #8815 along with the #8815-1 to perform the diagnosis. Using a voltmeter, perform a voltage drop test by backprobing the (G224) EOT Signal circuit at the Engine Oil Temperature Sensor harness connector and probing the appropriate terminal of the special tool #8815. Make sure the voltmeter leads are connected so that positive polarity is displayed on the voltmeter. WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death. Start the engine. Is the voltage below 0.5 volts? Yes Go to 6) . No Repair the (G224) EOT Signal circuit for high resistance. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
6. 6) (K900) SENSOR GROUND CIRCUIT HIGH RESISTANCE Turn the ignition off. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool #8815 along with the #8815-1 to perform the diagnosis. Using a voltmeter, perform a voltage drop test by backprobing the (K900) Sensor Ground circuit at the Engine Oil Temperature Sensor harness connector and probing the appropriate terminal of the special tool #8815. Make sure the voltmeter leads are connected so that positive polarity is displayed on the voltmeter. WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death. Start the engine. Is the voltage below 0.5 volts? Yes Go to 7) . No Repair the (K900) Sensor Ground circuit for high resistance. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
7. 7) PCM NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary. Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits. Were there any problems found? Yes Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Replace and program the Powertrain Control Module per Service Information. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .

1. When Monitored: With the ignition on. Battery voltage greater than 10.4 volts.

1. Set Condition: The Engine Oil Temperature sensor circuit voltage at the PCM is less than the calibrated amount. One Trip Fault. Three good trips to clear the MIL.

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

Scheme 150

Scheme 151

Scheme 152

1. 1) ACTIVE DTC Start the engine and allow it to reach normal operating temperature. WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death. NOTE: Diagnose and repair any system voltage DTCs before continuing with this test. With the scan tool, select View DTCs. Is the DTC Active at this time? Yes Go to 2) . No Refer to «INTERMITTENT CONDITION»(ref-288287-S02739760862008062000000) Diagnostic Procedure.
2. 2) (G224) ENGINE OIL TEMP SIGNAL CIRCUIT SHORTED TO THE (K900) SENSOR GROUND CIRCUIT Turn the ignition off. Disconnect the PCM harness connectors. Measure the resistance between the (K900) Sensor ground circuit and the (G224) Engine Oil Temp Signal circuit in the Engine Oil Temp Sensor harness connector. Is the resistance below 5.0 ohms? Yes Repair the short to between the (K900) Sensor ground circuit and the (G224) Engine Oil Temp Signal circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 3) .
3. 3) (G224) ENGINE OIL TEMP SIGNAL CIRCUIT SHORTED GROUND Measure the resistance between ground and the (G224) Engine Oil Temp Signal circuit in the Engine Oil Temp Sensor harness connector. Is the resistance below 100 ohms? Yes Repair the short to ground in the (G224) Engine Oil Temp Signal circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 4) .
4. 4) (G224) EOT SIGNAL CIRCUIT OPEN CIRCUIT OR HIGH RESISTANCE CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals, resulting in poor terminal to pin connection. Install Miller Special Tool #8815 to perform diagnosis. Measure the resistance of the (G224) EOT Signal circuit between the Engine Oil Temperature Sensor harness connector and the appropriate terminal of special tool #8815. Is the resistance below 5.0 ohms? Yes Go to 5) . No Repair the excessive resistance in the (G224) EOT Signal circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
5. 5) PCM NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary. Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits. Were there any problems found? Yes Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Replace and program the Powertrain Control Module per Service Information. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .

1. When Monitored: With the ignition on. Battery voltage greater than 10.4 volts.

1. Set Condition: The Engine Oil Temperature sensor circuit voltage at the PCM is greater than the calibrated amount. One Trip Fault. Three good trips to turn off the MIL.

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

Scheme 153

Scheme 154

1. 1) ACTIVE DTC Start the engine and allow it to reach normal operating temperature. WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death. NOTE: Diagnose and repair any system voltage DTCs before continuing with this test. With the scan tool, select View DTCs. Is the DTC Active at this time? Yes Go to 2) . No Refer to «INTERMITTENT CONDITION»(ref-288287-S02739760862008062000000) Diagnostic Procedure.
2. 2) ENGINE OIL TEMP SENSOR With the scan tool, clear the DTC. Turn the ignition off. Disconnect the Engine Oil Temp Sensor harness connector. Connect a jumper wire between the (G224) Engine Oil Temp Signal circuit and the (K900) Sensor ground circuit in the Engine Oil Temp Sensor harness connector. Ignition on, engine not running. With a scan tool, select View DTCs. Does the P0197-ENGINE OIL TEMPERATURE SENSOR CIRCUIT LOW DTC set? Yes Replace the Engine Oil Temp Sensor. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 3) . NOTE: Remove the jumper wire before continuing.
3. 3) (G224) ENGINE OIL TEMP SIGNAL CIRCUIT SHORTED TO VOLTAGE Turn the ignition off. Disconnect the C2 and C3 PCM harness connectors. Ignition on, engine not running. Measure the voltage on the (G224) Engine Oil Temp Signal circuit in the Engine Oil Temp Sensor harness connector. Is there any voltage present? Yes Repair the short to voltage in the (G224) Engine Oil Temp Signal circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 4) .
4. 4) (G224) ENGINE OIL TEMP SIGNAL CIRCUIT OPEN Turn the ignition off. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool #8815 to perform diagnosis. Measure the resistance of the (G224) Engine Oil Temp Signal circuit from the Engine Oil Temp Sensor harness connector to the appropriate terminal of special tool #8815. Is the resistance below 5.0 ohms? Yes Go to 5) . No Repair the open in the (G224) Engine Oil Temp Signal circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
5. 5) (K900) SENSOR GROUND CIRCUIT OPEN Measure the resistance of the (K900) Sensor ground circuit from the Engine Oil Temp Sensor harness connector to the appropriate terminal of special tool #8815. Is the resistance below 5.0 ohms? Yes Go to 6) . No Repair the open in the (K900) Sensor ground circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
6. 6) PCM NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary. Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits. Were there any problems found? Yes Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Replace and program the Powertrain Control Module per Service Information. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .

Scheme 155

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. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 156

Scheme 157

Scheme 158

Scheme 159

1. 1) DTC IS ACTIVE Turn the ignition on. With the scan tool, select View DTCs. Record DTC and Freeze Frame information. Start the engine and allow it to reach operating temperature. WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death. NOTE: Review Freeze Frame information. Operate the vehicle under conditions similar to which the DTC was set. With a scan tool, select View DTCs. Is the DTC Active at this time? Yes Go to 2) . No Refer to «INTERMITTENT CONDITION»(ref-288287-S02739760862008062000000) Diagnostic Procedure.
2. 2) FUEL INJECTOR 1 CIRCUIT RESISTANCE Turn the ignition off. Disconnect the C2 PCM harness connector. Remove the ASD Relay connector. NOTE: The resistance of the circuit will vary according to the temperature of the injector coil. Use the table below to determine the resistance range of the injector. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals, resulting in poor terminal to pin connection. Install Miller Special Tool #8815 to perform diagnosis. Measure the resistance of the Fuel Injector 1 circuit from the appropriate terminal of special tool #8815 and the ASD Relay connector. Fuel Injector Coil Resistance Based on Engine Temperature Temperature Resistance -20° C (-4° F) 10 ohms (+/-.6 of an ohm) 20° C (68° F) 12 ohms (+/-.6 of an ohm) 60° C (140° F) 14 ohms (+/-.6 of an ohm) 100° C (212° F) 16 ohms (+/-.6 of an ohm) Is the resistance of the injector within the specified range? Yes Go to 7) . No Go to 3) .
3. 3) FUEL INJECTOR 1 WIRING AND CONNECTOR INSPECTION Turn the ignition off. Verify that the Fuel Injector 1 is properly connected to the injector. Disconnect the Fuel Injector 1 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 1 wiring and connector. Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the Injector and Powertrain Control Module connectors. Were any problems found? Yes Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 4) .
4. 4) (F42) ASD RELAY OUTPUT CIRCUIT OPEN OR HIGH RESISTANCE 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 (F42) ASD Relay Output circuit in the Fuel Injector 1 harness connector. NOTE: The test light should be illuminated and bright. Compare the brightness to that of a direct connection to the battery. Is the test light illuminated and bright? Yes Go to 5) . No Repair the excessive resistance or short to ground in the (F42) ASD Relay Output circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
5. 5) (K11) INJECTOR 1 CONTROL CIRCUIT OPEN OR HIGH RESISTANCE CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals, resulting in poor terminal to pin connection. Install Miller Special Tool #8815 to perform diagnosis. Measure the resistance of the (K11) Injector 1 Control circuit between the Fuel Injector 1 harness connector and the appropriate terminal of special tool #8815. Is the resistance below 5.0 ohms? Yes Go to 6) . No Repair the excessive resistance in the (K11) Injector 1 Control circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
6. 6) FUEL INJECTOR 1 Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Fuel Injector 1 and the Powertrain Control Module (PCM). Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Refer to any Technical Service Bulletins that may apply. Verify that there is good pin to terminal contact in the Injector and Powertrain Control Module connectors. Were any problems found? Yes Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Replace the Fuel Injector 1 in accordance with the Service Information. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
7. 7) (K11) INJECTOR 1 CONTROL CIRCUIT SHORTED TO GROUND Turn the ignition off. Disconnect the C2 PCM harness connector. Measure the resistance between ground and the (K11) Injector 1 Control circuit in the Fuel Injector 1 harness connector. Is the resistance above 100 ohms? Yes Go to 8) . No Repair the (K11) Injector 1 Control circuit for a short to ground. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
8. 8) POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Fuel Injector 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. Verify that there is good pin to terminal contact in the Injector and Powertrain Control Module connectors. Refer to any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Replace and program the Powertrain Control Module (PCM) in accordance with the Service Information. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .

Scheme 160

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. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 161

Scheme 162

Scheme 163

Scheme 164

1. 1) ACTIVE DTC Turn the ignition on. With the scan tool, select View DTCs. Record DTC and Freeze Frame information. Start the engine and allow it to reach operating temperature. WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death. NOTE: Review Freeze Frame information. Operate the vehicle under conditions similar to which the DTC was set. With a scan tool, select View DTCs. Is the DTC Active at this time? Yes Go to 2) . No Refer to «INTERMITTENT CONDITION»(ref-288287-S02739760862008062000000) Diagnostic Procedure.
2. 2) FUEL INJECTOR 2 CIRCUIT RESISTANCE Turn the ignition off. Disconnect the C2 PCM harness connector. Remove the ASD Relay. NOTE: The resistance of the circuit will vary according to the temperature of the injector coil. Use the table below to determine the resistance range of the injector. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool #8815 to perform diagnosis. Measure the resistance of the Fuel Injector 2 circuit from the appropriate terminal of special tool #8815 and the ASD Relay connector. Fuel Injector Coil Resistance Based on Engine Temperature Temperature Resistance -20° C (-4° F) 10 ohms (+/-.6 of an ohm) 20° C (68° F) 12 ohms (+/-.6 of an ohm) 60° C (140° F) 14 ohms (+/-.6 of an ohm) 100° C (212° F) 16 ohms (+/-.6 of an ohm) Is the resistance of the injector within the specified range? Yes Go to 7) . No Go to 3) .
3. 3) FUEL INJECTOR 2 WIRING AND CONNECTOR INSPECTION Turn the ignition off. Verify that the Fuel Injector 2 is properly connected to the injector. Disconnect the Fuel Injector 2 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 2 wiring and connector. Look for any chafed, pierced, pinched, or partially broken wires. Verify that there is good pin to terminal contact in the Injector and Powertrain Control Module connectors. Look for broken, bent, pushed out or corroded terminals. Were any problems found? Yes Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 4) .
4. 4) (F42) ASD RELAY OUTPUT CIRCUIT OPEN OR HIGH RESISTANCE 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 (F42) ASD Relay Output circuit in the Fuel Injector 2 harness connector. NOTE: The test light should be illuminated and bright. Compare the brightness to that of a direct connection to the battery. Is the test light illuminated and bright? Yes. Go to 5) . No. Repair the excessive resistance or short to ground in the (F42) ASD Relay Output circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
5. 5) (K12) INJECTOR CONTROL NO. 2 CIRCUIT OPEN CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool #8815 to perform diagnosis. Measure the resistance of the (K12) Injector Control No. 2 circuit from the Fuel Injector harness connector to the appropriate terminal of special tool #8815. Is the resistance below 5.0 ohms? Yes Go to 6) . No Repair the open in the (K12) Injector Control No. 2 circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
6. 6) FUEL INJECTOR 2 Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Fuel Injector 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. Verify that there is good pin to terminal contact in the Injector and Powertrain Control Module connectors. Refer to any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Replace the Fuel Injector 2 in accordance with the Service Information. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
7. 7) (K12) INJECTOR CONTROL NO. 2 CIRCUIT SHORTED TO GROUND Turn the ignition off. Disconnect the C2 PCM harness connector. Measure the resistance between ground and the (K12) Injector Control No. 2 circuit in the Injector harness connector. Is the resistance below 100 ohms? Yes Repair the short to ground in the (K12) Injector Control No. 2 circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 8) .
8. 8) POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Fuel Injector 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. Verify that there is good pin to terminal contact in the Injector and Powertrain Control Module connectors. Refer to any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Replace and program the Powertrain Control Module per Service Information. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .

Scheme 165

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. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 166

Scheme 167

Scheme 168

Scheme 169

1. 1) ACTIVE DTC Turn the ignition on. With the scan tool, select View DTCs. Record DTC and Freeze Frame information. Start the engine and allow it to reach operating temperature. WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death. NOTE: Review Freeze Frame information. Operate the vehicle under conditions similar to which the DTC was set. With a scan tool, select View DTCs. Is the DTC Active at this time? Yes Go to 2) . No Refer to «INTERMITTENT CONDITION»(ref-288287-S02739760862008062000000) Diagnostic Procedure.
2. 2) FUEL INJECTOR 3 CIRCUIT RESISTANCE Turn the ignition off. Disconnect the C2 PCM harness connector. Remove the ASD Relay. NOTE: The resistance of the circuit will vary according to the temperature of the injector coil. Use the table below to determine the resistance range of the injector. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool #8815 to perform diagnosis. Measure the resistance of the Fuel Injector 3 circuit from the appropriate terminal of special tool #8815 and the ASD Relay connector. Fuel Injector Coil Resistance Based on Engine Temperature Temperature Resistance -20° C (-4° F) 10 ohms (+/-.6 of an ohm) 20° C (68° F) 12 ohms (+/-.6 of an ohm) 60° C (140° F) 14 ohms (+/-.6 of an ohm) 100° C (212° F) 16 ohms (+/-.6 of an ohm) Is the resistance of the injector within the specified range? Yes Go to 7) . No Go to 3) .
3. 3) FUEL INJECTOR 3 WIRING AND CONNECTOR INSPECTION Turn the ignition off. Verify that the Fuel Injector 3 is properly connected to the injector. Disconnect the Fuel Injector 3 connector and Inspect the terminals for any condition that would result in a poor connection. Using the wiring diagram/schematic as a guide, inspect the Fuel Injector 3 wiring and connector. Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the Injector and Powertrain Control Module connectors. Were any problems found? Yes Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 4) .
4. 4) (F42) ASD RELAY OUTPUT CIRCUIT OPEN OR HIGH RESISTANCE 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 (F42) ASD Relay Output circuit in the Fuel Injector 3 harness connector. NOTE: The test light should be illuminated and bright. Compare the brightness to that of a direct connection to the battery. Is the test light illuminated and bright? Yes. Go to 5) . No. Repair the excessive resistance or short to ground in the (F42) ASD Relay Output circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
5. 5) (K13) INJECTOR CONTROL NO. 3 CIRCUIT OPEN CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool #8815 to perform diagnosis. Measure the resistance of the (K13) Injector Control No. 3 circuit from the Fuel Injector harness connector to the appropriate terminal of special tool #8815. Is the resistance below 5.0 ohms? Yes Go to 6) . No Repair the open in the (K13) Injector Control No. 3 circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
6. 6) FUEL INJECTOR 3 Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Fuel Injector 3 and the Powertrain Control Module (PCM). Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Refer to any Technical Service Bulletins that may apply. Verify that there is good pin to terminal contact in the Injector and Powertrain Control Module connectors. Were any problems found? Yes Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Replace the Fuel Injector 3 in accordance with the Service Information. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
7. 7) (K13) INJECTOR CONTROL NO. 3 CIRCUIT SHORTED TO GROUND Turn the ignition off. Disconnect the C2 PCM harness connector. Measure the resistance between ground and the (K13) Injector Control No. 3 circuit in the Injector harness connector. Is the resistance below 100 ohms? Yes Repair the short to ground in the (K13) Injector Control No. 3 circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 8) .
8. 8) POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Fuel Injector 3 and the Powertrain Control Module (PCM). Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the Injector and Powertrain Control Module connectors. Refer to any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Replace and program the Powertrain Control Module per Service Information. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .

Scheme 170

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. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 171

Scheme 172

Scheme 173

Scheme 174

1. 1) ACTIVE DTC Turn the ignition on. With the scan tool, select View DTCs. Record DTC and Freeze Frame information. Start the engine and allow it to reach operating temperature. WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death. NOTE: Review Freeze Frame information. Operate the vehicle under conditions similar to which the DTC was set. With a scan tool, select View DTCs. Is the status Active for this DTC? Yes Go to 2) . No Refer to «INTERMITTENT CONDITION»(ref-288287-S02739760862008062000000) Diagnostic Procedure.
2. 2) FUEL INJECTOR 4 CIRCUIT RESISTANCE Turn the ignition off. Disconnect the C2 PCM harness connector. Remove the ASD Relay. NOTE: The resistance of the circuit will vary according to the temperature of the injector coil. Use the table below to determine the resistance range of the injector. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool #8815 to perform diagnosis. Measure the resistance of the Fuel Injector 4 circuit from the appropriate terminal of special tool #8815 and the ASD Relay connector. Fuel Injector Coil Resistance Based on Engine Temperature Temperature Resistance -20° C (-4° F) 10 ohms (+/-.6 of an ohm) 20° C (68° F) 12 ohms (+/-.6 of an ohm) 60° C (140° F) 14 ohms (+/-.6 of an ohm) 100° C (212° F) 16 ohms (+/-.6 of an ohm) Is the resistance of the injector within the specified range? Yes Go to 7) . No Go to 3) .
3. 3) FUEL INJECTOR 4 WIRING AND CONNECTOR INSPECTION Turn the ignition off. Verify that the Fuel Injector 4 is properly connected to the injector. Disconnect the Fuel Injector 4 connector and Inspect the terminals for any condition that would result in a poor connection. Using the wiring diagram/schematic as a guide, inspect the Fuel Injector 4 wiring and connector. Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the Injector and Powertrain Control Module connectors. Were any problems found? Yes Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 4) .
4. 4) (F42) ASD RELAY OUTPUT CIRCUIT OPEN OR HIGH RESISTANCE 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 (F42) ASD Relay Output circuit in the Fuel Injector 4 harness connector. NOTE: The test light should be illuminated and bright. Compare the brightness to that of a direct connection to the battery. Is the test light illuminated and bright? Yes. Go to 5) . No. Repair the excessive resistance or short to ground in the (F42) ASD Relay Output circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
5. 5) (K14) INJECTOR CONTROL NO. 4 CIRCUIT OPEN CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool #8815 to perform diagnosis. Measure the resistance of the (K14) Injector Control No. 4 circuit from the Fuel Injector harness connector to the appropriate terminal of special tool #8815. Is the resistance below 5.0 ohms? Yes Go to 6) . No Repair the open in the (K14) Injector Control No. 4 circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
6. 6) FUEL INJECTOR 4 Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Fuel Injector 4 and the Powertrain Control Module (PCM). Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the Injector and Powertrain Control Module connectors. Refer to any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Replace the Fuel Injector 4 in accordance with the Service Information. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
7. 7) (K14) INJECTOR CONTROL NO. 4 CIRCUIT SHORTED TO GROUND Turn the ignition off. Disconnect the C2 PCM harness connector. Measure the resistance between ground and the (K14) Injector Control No. 4 circuit in the Injector harness connector. Is the resistance below 100 ohms? Yes Repair the short to ground in the (K14) Injector Control No. 4 circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 8) .
8. 8) POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Fuel Injector 4 and the Powertrain Control Module (PCM). Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the Injector and Powertrain Control Module connectors. Refer to any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Replace and program the Powertrain Control Module per Service Information. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .

Scheme 175

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. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 176

Scheme 177

Scheme 178

Scheme 179

1. 1) ACTIVE DTC Turn the ignition on. With the scan tool, select View DTCs. Record DTC and Freeze Frame information. Start the engine and allow it to reach operating temperature. WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death. NOTE: Review Freeze Frame information. Operate the vehicle under conditions similar to which the DTC was set. With a scan tool, select View DTCs. Is the status Active for this DTC? Yes Go to 2) . No Refer to «INTERMITTENT CONDITION»(ref-288287-S02739760862008062000000) Diagnostic Procedure.
2. 2) FUEL INJECTOR 5 CIRCUIT RESISTANCE Turn the ignition off. Disconnect the C2 PCM harness connector. Remove the ASD Relay. NOTE: The resistance of the circuit will vary according to the temperature of the injector coil. Use the table below to determine the resistance range of the injector. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool #8815 to perform diagnosis. Measure the resistance of the Fuel Injector 5 circuit from the appropriate terminal of special tool #8815 and the ASD Relay connector. Fuel Injector Coil Resistance Based on Engine Temperature Temperature Resistance -20° C (-4° F) 10 ohms (+/-.6 of an ohm) 20° C (68° F) 12 ohms (+/-.6 of an ohm) 60° C (140° F) 14 ohms (+/-.6 of an ohm) 100° C (212° F) 16 ohms (+/-.6 of an ohm) Is the resistance of the injector within the specified range? Yes Go to 7) . No Go to 3) .
3. 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. Verify that there is good pin to terminal contact in the Injector and Powertrain Control Module connectors. Were any problems found? Yes Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 4) .
4. 4) (F42) ASD RELAY OUTPUT CIRCUIT OPEN OR HIGH RESISTANCE 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 (F42) ASD Relay Output circuit in the Fuel Injector 5 harness connector. NOTE: The test light should be illuminated and bright. Compare the brightness to that of a direct connection to the battery. Is the test light illuminated and bright? Yes. Go to 5) . No. Repair the excessive resistance or short to ground in the (F42) ASD Relay Output circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
5. 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 Miller Special Tool #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 6) . No Repair the open in the (K38) Injector Control No. 5 circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
6. 6) FUEL INJECTOR 5 Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Fuel Injector 5 and the Powertrain Control Module (PCM). Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the Injector and Powertrain Control Module connectors. Refer to any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Replace the Fuel Injector 5 in accordance with the Service Information. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
7. 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 «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 8) .
8. 8) POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Fuel Injector 5 and the Powertrain Control Module (PCM). Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the Injector and Powertrain Control Module connectors. Refer to any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Replace and program the Powertrain Control Module per Service Information. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .

Scheme 180

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. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 181

Scheme 182

Scheme 183

Scheme 184

1. 1) ACTIVE DTC Turn the ignition on. With the scan tool, select View DTCs. Record DTC and Freeze Frame information. Start the engine and allow it to reach operating temperature. WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death. NOTE: Review Freeze Frame information. Operate the vehicle under conditions similar to which the DTC was set. With a scan tool, select View DTCs. Is the status Active for this DTC? Yes Go to 2) . No Refer to «INTERMITTENT CONDITION»(ref-288287-S02739760862008062000000) Diagnostic Procedure.
2. 2) FUEL INJECTOR 6 CIRCUIT RESISTANCE Turn the ignition off. Disconnect the C2 PCM harness connector. Remove the ASD Relay. NOTE: The resistance of the circuit will vary according to the temperature of the injector coil. Use the table below to determine the resistance range of the injector. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool #8815 to perform diagnosis. Measure the resistance of the Fuel Injector 6 circuit from the appropriate terminal of special tool #8815 and the ASD Relay connector. Fuel Injector Coil Resistance Based on Engine Temperature Temperature Resistance -20° C (-4° F) 10 ohms (+/-.6 of an ohm) 20° C (68° F) 12 ohms (+/-.6 of an ohm) 60° C (140° F) 14 ohms (+/-.6 of an ohm) 100° C (212° F) 16 ohms (+/-.6 of an ohm) Is the resistance of the injector within the specified range? Yes Go to 7) . No Go to 3) .
3. 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. Verify that there is good pin to terminal contact in the Injector and Powertrain Control Module connectors. Were any problems found? Yes Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 4) .
4. 4) (F42) ASD RELAY OUTPUT CIRCUIT OPEN OR HIGH RESISTANCE 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 (F42) ASD Relay Output circuit in the Fuel Injector 6 harness connector. NOTE: The test light should be illuminated and bright. Compare the brightness to that of a direct connection to the battery. Is the test light illuminated and bright? Yes. Go to 5) . No. Repair the excessive resistance or short to ground in the (F42) ASD Relay Output circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
5. 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 Miller Special Tool #8816 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 6) . No Repair the open in the (K58) Injector Control No. 6 circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
6. 6) FUEL INJECTOR 6 Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Fuel Injector 6 and the Powertrain Control Module (PCM). Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the Injector and Powertrain Control Module connectors. Refer to any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Replace the Fuel Injector 6 in accordance with the Service Information. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
7. 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 «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 8) .
8. 8) POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Fuel Injector 6 and the Powertrain Control Module (PCM). Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the Injector and Powertrain Control Module connectors. Refer to any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Replace and program the Powertrain Control Module per Service Information. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .

Scheme 185

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. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 186

Scheme 187

Scheme 188

Scheme 189

1. 1) ACTIVE DTC Turn the ignition on. With the scan tool, select View DTCs. Record DTC and Freeze Frame information. Start the engine and allow it to reach operating temperature. WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death. NOTE: Review Freeze Frame information. Operate the vehicle under conditions similar to which the DTC was set. With a scan tool, select View DTCs. Is the DTC Active at this time? Yes Go to 2) . No Refer to «INTERMITTENT CONDITION»(ref-288287-S02739760862008062000000) Diagnostic Procedure.
2. 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 Miller Special Tool #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) Is the resistance of the injector within the specified range? Yes Go to 7) . No Go to 3) .
3. 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. Verify that there is good pin to terminal contact in the Injector and Powertrain Control Module connectors. Were any problems found? Yes Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 4) .
4. 4) (F42) ASD RELAY OUTPUT CIRCUIT OPEN OR HIGH RESISTANCE 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 (F42) 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 5) . No. Repair the excessive resistance or short to ground in the (F42) ASD Relay Output circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
5. 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 Miller Special Tool #8817 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 6) . No Repair the open in the (K26) Injector Control No. 7 circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
6. 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 Injector and Powertrain Control Module connectors. Refer to any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Replace the Fuel Injector 7 in accordance with the Service Information. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
7. 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 «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 8) .
8. 8) POWERTRAIN CONTROL MODULE (PCM) 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 Injector and Powertrain Control Module connectors. Refer to any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Replace and program the Powertrain Control Module per Service Information. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .

Scheme 190

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. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 191

Scheme 192

Scheme 193

1. 1) ACTIVE DTC Turn the ignition on. With the scan tool, select View DTCs. Record DTC and Freeze Frame information. Start the engine and allow it to reach operating temperature. WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death. NOTE: Review Freeze Frame information. Operate the vehicle under conditions similar to which the DTC was set. With a scan tool, select View DTCs. Is the DTC Active at this time? Yes Go to 2) . No Refer to «INTERMITTENT CONDITION»(ref-288287-S02739760862008062000000) Diagnostic Procedure.
2. 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 Miller Special Tool #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) Is the resistance of the injector within the specified range? Yes Go to 7) . No Go to 3) .
3. 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. Verify that there is good pin to terminal contact in the Injector and Powertrain Control Module connectors. Were any problems found? Yes Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 4) .
4. 4) (F42) ASD RELAY OUTPUT CIRCUIT OPEN OR HIGH RESISTANCE 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 (F42) 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 5) . No. Repair the excessive resistance or short to ground in the (F42) ASD Relay Output circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
5. 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 Miller Special Tool #8818 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 6) . No Repair the open in the (K28) Injector Control No. 8 circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
6. 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 Injector and Powertrain Control Module connectors. Refer to any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Replace the Fuel Injector 8 in accordance with the Service Information. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
7. 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 «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 8) .
8. 8) POWERTRAIN CONTROL MODULE (PCM) 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 Injector and Powertrain Control Module connectors. Refer to any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Replace and program the Powertrain Control Module per Service Information. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .

Scheme 194

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

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

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

Scheme 195

Scheme 196

Scheme 197

1. 1) ACTIVE DTC NOTE: When this DTC is Active the engine speed, torque, and vehicle speed are limited to a Limp in mode. NOTE: Diagnose any other TP Sensor DTC(s) before continuing. NOTE: The throttle plate and linkage should be free from binding and carbon build up. NOTE: Make sure the throttle plate is at the idle position. NOTE: Inspect the engine for vacuum leaks. Ignition on, engine not running. With a scan tool, select View DTCs. Is the DTC Active at this time? Yes Go to 2) . No Go to 9) .
2. 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 Miller Special Tool #8815 along with the #8815-1 to perform the diagnosis. Using a voltmeter perform a voltage drop test. Backprobe the (K122) TP Sensor No. 2 Signal circuit at the Throttle Body harness connector and probe the appropriate terminal of the special tool #8815. Make sure the voltmeter leads are connected so a positive polarity is displayed on the voltmeter. WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death. Start the engine and allow it to reach normal operating temperature. Monitor the voltmeter. Is the voltage below 0.5 of a volt? Yes Go to 3) . No Repair the excessive resistance in the (K122) TP Sensor No. 2 Signal circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
3. 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 special tool #8815. Make sure the voltmeter leads are connected so a positive polarity is displayed on the voltmeter. WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death. Start the engine and allow it to reach normal operating temperature. Monitor the voltmeter. Is the voltage below 0.5 of a volt? Yes Go to 4) . No Repair the excessive resistance in the (K22) TP Sensor No. 1 Signal circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
4. 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 special tool #8815. Make sure the voltmeter leads are connected so a positive polarity is displayed on the voltmeter. WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death. Start the engine and allow it to reach normal operating temperature. Monitor the voltmeter. Is the voltage below 0.5 of a volt? Yes Go to 5) . No Repair the excessive resistance in the (F855) 5-volt Supply circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
5. 5) EXCESSIVE RESISTANCE IN THE (K922) SENSOR RETURN CIRCUIT Turn the ignition off. Move the voltmeter leads to backprobe the (K922) Sensor Return circuit at the Throttle Body harness connector and to probe the appropriate terminal of the special tool #8815. Make sure the voltmeter leads are connected so a positive polarity is displayed on the voltmeter. WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death. Start the engine and allow it to reach normal operating temperature. Monitor the voltmeter. Is the voltage below 0.5 of a volt? Yes Go to 6) . No Repair the excessive resistance in the (K922) Sensor Return circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
6. 6) (K22) TP SENSOR NO. 1 SIGNAL CIRCUIT SHORTED TO THE (K122) TP SENSOR NO. 2 SIGNAL CIRCUIT 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 «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 7) .
7. 7) THROTTLE POSITION SENSOR Turn the ignition off. Connect the C2 PCM harness connector. Ignition on, engine not running. With the scan tool, monitor the TP Sensor No. 1 and No. 2 voltage. Connect a jumper wire between the (K922) 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. For TP Sensor No. 2, 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. Is the voltage reading within the listed specification with the jumper wire installed? Yes Disconnect the Battery when replacing the Throttle Body Assembly. Replace the Throttle Body Assembly. After installation is complete, using a scan tool, select the ETC RELEARN function. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 8) . NOTE: Remove the jumper wire before continuing.
8. 8) PCM NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary. Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits. Were there any problems found? Yes Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Replace and program the Powertrain Control Module per Service Information. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
9. 9) THROTTLE FOLLOWER TEST Ignition on, engine not running. With the scan tool, perform the 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 0.3 of a volt and increase to above 4.3 volts. The voltage for TP Sensor No. 2 should start at approximately 4.3 volts and decrease to approximately 0.3 of a volt. Is the voltage within the range of the listed specification for the appropriate Sensor? Yes Refer to «INTERMITTENT CONDITION»(ref-288287-S02739760862008062000000) Diagnostic Procedure. No Disconnect the Battery when replacing the Throttle Body Assembly. Replace the Throttle Body Assembly. After installation is complete, using a scan tool select the ETC RELEARN function. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .

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

1. Set Condition: Throttle Position Sensor voltage at the PCM is less than 0.16 of a volt for 0.7 of a second. One Trip Fault. Three good trips to turn off the MIL. ETC light will illuminate.

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

Scheme 198

Scheme 199

Scheme 200

Scheme 201

Scheme 202

Scheme 203

1. 1) ACTIVE DTC NOTE: When this DTC is Active the engine speed, torque, and vehicle speed are limited to a Limp in mode. 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. Ignition on, engine not running. With the scan tool, select View DTCs. Is the DTC Active at this time? Yes Go to 2) . No Go to 11) .
2. 2) P0122 ALSO SET Was the P0122-TP SENSOR NO. 1 VOLTAGE LOW DTC set along with the P0222? Yes Go to 3) . No Go to 4) .
3. 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 5.2 volts? Yes Go to 4) . No Go to 8) .
4. 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 5.2 volts with the jumper wire installed? Yes Disconnect the Battery when replacing the Throttle Body Assembly. Replace the Throttle Body Assembly. After installation is complete, with a scan tool select the ETC RELEARN function. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 5) . NOTE: Remove the jumper wire before continuing.
5. 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 Miller Special Tool #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 special tool #8815. Is the resistance below 5.0 ohms? Yes Go to 6) . No Repair the open in the (K122) TP Sensor No. 2 Signal circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
6. 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 «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 7) .
7. 7) (K122) TP SENSOR NO. 2 SIGNAL CIRCUIT SHORTED TO THE (K922) 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) Sensor Return circuit and the (K122) TP Sensor No. 2 Signal circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 10) .
8. 8) (F855) 5-VOLT SUPPLY CIRCUIT OPEN Turn the ignition off. Disconnect the C2 PCM harness connector. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool #8815 to perform diagnosis. Measure the resistance of the (F855) 5-volt Supply circuit from the Throttle Body harness connector to the appropriate terminal of special tool #8815. Is the resistance below 5.0 ohms? Yes Go to 9) . No Repair the open in the (F855) 5-volt Supply circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
9. 9) (F855) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND Measure the resistance between ground and the (F855) 5-volt Supply circuit 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 «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 10) .
10. 10) PCM NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary. Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits. Were there any problems found? Yes Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Replace and program the Powertrain Control Module per Service Information. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
11. 11) THROTTLE FOLLOWER TEST Ignition on, engine not running. With the scan tool, perform the Throttle Follower Test. Monitor the TP Sensor No. 2 voltage while slowly pressing the Throttle pedal down. Is there a smooth voltage change from high to low? Yes Refer to «INTERMITTENT CONDITION»(ref-288287-S02739760862008062000000) Diagnostic Procedure. No Disconnect the Battery when replacing the Throttle Body Assembly. Replace the Throttle Body Assembly. After installation is complete, with a scan tool select the ETC RELEARN function. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .

1. When Monitored: With the ignition on.

1. Set Condition: Throttle Position Sensor No. 2 Signal circuit voltage is greater than 4.9 volts for 25 ms. One Trip Fault. ETC light will illuminate.

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

Scheme 204

Scheme 205

Scheme 206

1. 1) ACTIVE DTC NOTE: When this DTC is Active the engine speed, torque, and vehicle speed are limited to a Limp in mode. NOTE: If a 5-Volt supply DTC has also set, diagnose the 5-Volt DTC before continuing. Ignition on, engine not running. With a scan tool, select View DTCs. Is the DTC Active at this time? Yes Go to 2) . No Go to 7) .
2. 2) THROTTLE POSITION SENSOR Turn the ignition off. Disconnect the Throttle Body Assembly harness connector. Ignition on, engine not running. With the scan tool monitor the TP Sensor No. 2 voltage. Is the voltage below 0.5 volt? Yes Disconnect the Battery when replacing the Throttle Body Assembly. Replace the Throttle Body Assembly. After installation is complete, with the scan tool select the ETC RELEARN function. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 3) .
3. 3) (K122) TP SENSOR NO. 2 SIGNAL CIRCUIT SHORTED TO BATTERY 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 the voltage above 0 volts? Yes Repair the short to battery voltage in the (K122) TP Sensor No. 2 Signal circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 4) .
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 «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 5) .
5. 5) (K922) 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 Miller Special Tool #8815 to perform diagnosis. Measure the resistance of the (K922) Sensor Return circuit from the Throttle Body harness connector to the appropriate terminal of special tool #8815. Is the resistance below 5.0 ohms? Yes Go to 6) . No Repair the open in the (K922) Sensor Return circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
6. 6) PCM NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary. Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits. Were there any problems found? Yes Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Replace and program the Powertrain Control Module per Service Information. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
7. 7) THROTTLE FOLLOWER TEST With the scan tool, perform the Throttle Follower Test. Monitor the TP Sensor No. 2 voltage while slowly pressing the Throttle pedal down. Is there a smooth voltage change from high to low? Yes Refer to «INTERMITTENT CONDITION»(ref-288287-S02739760862008062000000) Diagnostic Procedure. No Disconnect the Battery when replacing the Throttle Body Assembly. Replace the Throttle Body Assembly. After installation is complete, with the scan tool select the ETC RELEARN function. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .

1. When Monitored: The engine oil temperature has dropped below a calibrated value. Engine start up.

1. Set Condition: The Engine Oil temperature rises faster than a calibrated modeled temperature. When the actual oil temperature exceeds the high boundary of the calibrated modeled temperature for 3 minutes the fault is set. Two trip fault. Three good trips to turn off the MIL.

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

Scheme 207

Scheme 208

Scheme 209

1. 1) DTC IS ACTIVE NOTE: Diagnose any CAN - C Communication DTCs before continuing. Turn the ignition off. If possible, allow the vehicle to sit with the ignition off for more than 60 minutes in an environment where the temperature will allow the oil temperature to cool down. Start the engine and allow it to reach normal operating conditions. With a scan tool, select View DTCs. Is the status Active or Pending for this DTC? Yes Go to 2) . No Refer to «INTERMITTENT CONDITION»(ref-288287-S02739760862008062000000) Diagnostic Procedure.
2. 2) ENGINE OIL The following conditions must be checked. OEM recommended oil viscosity is being used. Customer is following the oil change schedule. Check the engine oil for contamination. (i.e, fuel and/or engine coolant) Internal engine condition that may effect oil pressure. Were any of the above conditions found? Yes Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 3) .
3. 3) ENGINE OIL TEMPERATURE SENSOR VOLTAGE Turn the ignition off. Disconnect the Engine Oil Temperature Sensor harness connector. Turn the ignition on. With a scan tool, read the Engine Oil Temperature Sensor voltage. NOTE: The sensor voltage should be approximately 5.0 volts (plus or minus .1 volt) with the connector disconnected. Does the scan tool display the voltage as described above? Yes Go to 4) . No Go to 5) .
4. 4) ENGINE OIL TEMPERATURE SENSOR Turn the ignition off. Connect a jumper wire between the (G224) EOT Signal circuit and the (K900) Sensor Ground circuit in the Engine Oil Temperature Sensor harness connector. Turn the ignition on. With a scan tool, read the Engine Oil Temperature Sensor voltage. NOTE: The sensor voltage should be approximately 0.0 volts (plus or minus .1 volt) with the jumper wire in place. Does the scan tool display the voltage as described above? Yes Replace the Engine Oil Temperature Sensor. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 5) .
5. 5) (G224) EOT SIGNAL CIRCUIT HIGH RESISTANCE Turn the ignition off. Connect the Engine Oil Temperature Sensor harness connector. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool #8815 along with the #8815-1 to perform the diagnosis. Using a voltmeter, perform a voltage drop test by backprobing the (G224) EOT Signal circuit at the Engine Oil Temperature Sensor harness connector and probing the appropriate terminal of the special tool #8815. Make sure the voltmeter leads are connected so that positive polarity is displayed on the voltmeter. WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death. Start the engine. Is the voltage below 0.5 volts? Yes Go to 6) . No Repair the (G224) EOT Signal circuit for high resistance. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
6. 6) (K900) SENSOR GROUND CIRCUIT HIGH RESISTANCE Turn the ignition off. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool #8815 along with the #8815-1 to perform the diagnosis. Using a voltmeter, perform a voltage drop test by backprobing the (K900) Sensor Ground circuit at the Engine Oil Temperature Sensor harness connector and probing the appropriate terminal of the special tool #8815. Make sure the voltmeter leads are connected so that positive polarity is displayed on the voltmeter. WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death. Start the engine. Is the voltage below 0.5 volts? Yes Go to 7) . No Repair the (K900) Sensor Ground circuit for high resistance. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
7. 7) POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Engine Oil Temperature 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. Monitor the scan tool data relative to this circuit and wiggle test the wiring and connectors. Look for the data to change or for the DTC to reset during the wiggle test. Refer to any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Replace the Powertrain Control Module (PCM) in accordance with the Service Information. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .

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. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING 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. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 210

Scheme 211

Scheme 212

1. 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 can result in personal injury or death. NOTE: Attempt to operate the vehicle under conditions similar to which the DTC was set. NOTE: It may be necessary to test drive the vehicle within the DTC monitoring conditions in order for this DTC to set. With a scan tool, select View DTCs. Is the DTC Active at this time? Yes Go to 2) . No Refer to «INTERMITTENT CONDITION»(ref-288287-S02739760862008062000000) Diagnostic Procedure.
2. 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 «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 3) .
3. 3) (F42), (A15) 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. With the scan tool, actuate the ASD Relay. Using a 12-volt test light connected to ground, probe the (F42), (A15) ASD Relay Output circuit in the Ignition Coil harness connector and Fuel Injector harness connector while the relay is actuating. Does the test light illuminate brightly? Yes Go to 4) . No Repair the excessive resistance or short to ground in the (F42), (A15) ASD Relay Output circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
4. 4) IGNITION SYSTEM OPERATION WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death. Turn the ignition off. Connect the Ignition Coil 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. NOTE: A crisp blue spark that is able to jump the gap of the spark tester should be generated. Is good spark present? Yes Go to 5) . No Go to 14) . NOTE: Connect the Fuel Injector harness connector before continuing.
5. 5) SPARK PLUG Turn the ignition off. Remove the Spark Plug. Inspect the Spark Plug for the following conditions. - Cracks - Carbon Tracking - Foreign Material - Gap size out of specifications - Loose or broken electrode NOTE: Lightly tap the bottom of the spark plug on a solid surface. The electrode in the spark plug should not move. Were any of the above conditions present? Yes Replace the Spark Plug. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 6) .
6. 6) FUEL PRESSURE CHECK WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow these instructions can result in personal injury or death. WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death. Install a fuel pressure gauge to the fuel rail. Start the engine and observe the fuel pressure reading. NOTE: Fuel pressure specification is 407 kPa +/- 34 kPa (59 psi +/- 5 psi). Choose a conclusion that best matches your fuel pressure reading. Within Specification Go to 7) . Below Specification Go to 12) . Above Specification Replace the fuel filter/pressure regulator. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
7. 7) FUEL PRESSURE LEAK DOWN NOTE: Before continuing visually and physically inspect the fuel delivery system for external leaks or damage. Repair/replace as necessary. WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow these instructions can result in personal injury or death Turn the ignition off. Install special tool #6539 (5/16") or #6631 (3/8") fuel line adapter. Install the fuel pressure gauge. Start the engine and allow the fuel system to reach maximum pressure. Turn the ignition off. NOTE: Fuel specification is 407 kPa +/- 34 kPa (59 psi +/- 5 psi). Using special tool #C4390, Hose Clamp Pliers, pinch the rubber fuel line between the fuel pressure gauge and the engine. Monitor the fuel pressure gauge for a minimum of 5 minutes. NOTE: The pressure should not fall below 241 kPa (35 psi). Does the pressure fall below the listed specification? Yes Replace the leaking Fuel Injector(s). Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 8) .
8. 8) FUEL INJECTOR OPERATION WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow these instructions can result in personal injury or death. CAUTION: After each Fuel Injector actuation, start the engine to clean the cylinder of fuel. Failure to do so could cause engine damage. Remove special tool #C4390. Start the engine and allow the fuel pressure to reach maximum pressure. Ignition on, engine not running. Using the scan tool, actuate the No. 1 Fuel Injector. Monitor the fuel pressure gauge. Does the fuel pressure gauge indicate a drop in fuel pressure? Yes Go to 9) . No Go to 10) . NOTE: Turn the ignition off, remove the Fuel Pressure gauge, and connect the fuel lines before continuing.
9. 9) ENGINE MECHANICAL Check for any of the following conditions/mechanical problems. ENGINE VACUUM - must be at least 13 inches in neutral ENGINE VALVE TIMING - must be within specifications ENGINE COMPRESSION - must be within specifications ENGINE EXHAUST SYSTEM - must be free of any restrictions or leaks. ENGINE PCV SYSTEM - must flow freely TORQUE CONVERTER STALL SPEED - must be within specifications POWER BRAKE BOOSTER - no internal vacuum leaks FUEL - must be free of contamination CAM LOBES - must not be worn excessively CYLINDER LEAKAGE TEST - must be within specifications VALVE SPRINGS - cannot be weak or broken Are there any engine mechanical problems? Yes Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 16) .
10. 10) FUEL INJECTOR Turn the ignition off. Disconnect the No. 1 Fuel Injector harness connector. Ignition on, engine not running. NOTE: When a Misfire is detected for a particular cylinder, the PCM will shut down that cylinder's Injector Control circuit. With the scan tool, erase DTCs. Install an Injector Noid light. With the scan tool, actuate the Fuel Injector. Does the Noid light blink/flicker during the actuation? Yes Verify that there is good pin to terminal contact in the Fuel Injector and the Powertrain Control Module connectors. If OK, replace the Fuel Injector. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 11) .
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 Miller Special Tool #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 «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 16) .
12. 12) FUEL SUPPLY LINE RESTRICTED WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow these instructions can result in personal injury or death. Turn the ignition off. Raise vehicle on hoist, and disconnect the fuel pressure line at the fuel pump module. Install special tool #6539 (5/16") #6631(3/8") fuel line adapter and the fuel pressure gauge between the fuel supply line and the fuel pump module. Ignition on, engine not running. With the scan tool, actuate the ASD Fuel System test and observe the fuel pressure gauge. NOTE: Fuel pressure specification is 407 kPa +/- 34 kPa (59 psi +/- 5 psi). Is the fuel pressure within specification? Yes Repair or replace fuel supply line as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 13) .
13. 13) FUEL PUMP INLET STRAINER WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow these instructions can result in personal injury or death. Turn the ignition off. Remove the Fuel Pump Module and inspect the Fuel Inlet Strainer. Is the Fuel Inlet Strainer plugged? Yes Replace the Fuel Pump Inlet Strainer. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Before continuing, check the Fuel Pump Module harness connector terminals for corrosion, damage, or terminal push out. Make sure the ground circuit is functional. Repair as necessary. Replace the Fuel Pump Module. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
14. 14) IGNITION COIL WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death. Disconnect the Ignition Coil harness connector. Remove the Fuel Pump Relay or ASD Relay. Using a 12-volt test light connected to 12-volts, probe the Ignition Coil Control circuit. Crank the engine for 5 seconds while observing the test light. NOTE: The resistance of the 3.7L and 4.7L Primary Ignition coil is 0.6 to 0.9 of an ohm. NOTE: 5.7L (6.1L if applicable) Primary Ignition Coil resistance is 0.558 to 0.682 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. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 15) .
15. 15) (K86) 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 Miller Special Tool #8815 to perform diagnosis. Check the (K86) Coil Control No. 1 circuit for an open, short to ground, and short to voltage. Was a problem found with the (K86) Coil Control No. 1 circuit? Yes Repair the (K86) Coil Control No. 1 circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 16) .
16. 16) POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the related Sensor, Coil, Injector, and the Powertrain Control Module (PCM). Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the related Sensors, Coils, Injectors, and the Powertrain Control Module connectors. Refer to any Technical Service Bulletins that may apply. Were there any problems found? Yes Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Replace and program the Powertrain Control Module per Service Information. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .

Scheme 213

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. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 214

1. 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 can result in personal injury or death. NOTE: Attempt to operate the vehicle under conditions similar to which the DTC was set. NOTE: It may be necessary to test drive the vehicle within the DTC monitoring conditions in order for this DTC to set. With a scan tool, select View DTCs. Is the DTC Active at this time? Yes Go to 2) . No Refer to «INTERMITTENT CONDITION»(ref-288287-S02739760862008062000000) Diagnostic Procedure.
2. 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 «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 3) .
3. 3) (F42), (A15) ASD RELAY OUTPUT CIRCUIT Turn the ignition off. Disconnect the Ignition Coil No. 2 harness connector. Disconnect the Fuel Injector No. 2 harness connector. Ignition on, engine not running. With the scan tool, actuate the ASD Relay. Using a 12-volt test light connected to ground, probe the (F42), (A15) ASD Relay Output circuit in the Ignition Coil harness connector and Fuel Injector harness connector while the relay is actuating. Does the test light illuminate brightly? Yes Go to 4) . No Repair the excessive resistance or short to ground in the (F42), (A15) ASD Relay Output circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
4. 4) IGNITION SYSTEM OPERATION WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death. Turn the ignition off. Connect the Ignition Coil No. 2 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. NOTE: A crisp blue spark that is able to jump the gap of the spark tester should be generated. Is good spark present? Yes Go to 5) . No Go to 14) . NOTE: Connect the Fuel Injector harness connector before continuing.
5. 5) SPARK PLUG Turn the ignition off. Remove the Spark Plug. Inspect the Spark Plug for the following conditions. - Cracks - Carbon Tracking - Foreign Material - Gap size out of specifications - Loose or broken electrode NOTE: Lightly tap the bottom of the spark plug on a solid surface. The electrode in the spark plug should not move. Were any of the above conditions present? Yes Replace the Spark Plug. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 6) .
6. 6) FUEL PRESSURE CHECK WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow these instructions can result in personal injury or death. WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death. Install a fuel pressure gauge to the fuel rail. Start the engine and observe the fuel pressure reading. NOTE: Fuel pressure specification is 407 kPa +/- 34 kPa (59 psi +/- 5 psi). Choose a conclusion that best matches your fuel pressure reading. Within Specification Go to 7) . Below Specification Go to 12) . Above Specification Replace the fuel filter/pressure regulator. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
7. 7) FUEL PRESSURE LEAK DOWN NOTE: Before continuing visually and physically inspect the fuel delivery system for external leaks or damage. Repair/replace as necessary. WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow these instructions can result in personal injury or death. Turn the ignition off. Install special tool #6539 (5/16") or #6631 (3/8") fuel line adapter. Install the fuel pressure gauge. Start the engine and allow the fuel system to reach maximum pressure. Turn the ignition off. NOTE: Fuel specification is 407 kPa +/- 34 kPa (59 psi +/- 5 psi). Using special tool #C4390, Hose Clamp Pliers, pinch the rubber fuel line between the fuel pressure gauge and the engine. Monitor the fuel pressure gauge for a minimum of 5 minutes. NOTE: The pressure should not fall below 241 kPa (35 psi) Does the pressure fall below the listed specification? Yes Replace the leaking Fuel Injector(s). Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 8) .
8. 8) FUEL INJECTOR OPERATION WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow these instructions can result in personal injury or death. CAUTION: After each Fuel Injector actuation, start the engine to clean the cylinder of fuel. Failure to do so could cause engine damage. Remove special tool #C4390. Start the engine and allow the fuel pressure to reach maximum pressure. Ignition on, engine not running. Using scan tool, actuate the No. 2 Fuel Injector. Monitor the fuel pressure gauge. Does the fuel pressure gauge indicate a drop in fuel pressure? Yes Go to 9) . No Go to 10) . NOTE: Turn the ignition off, remove the Fuel Pressure gauge, and connect the fuel lines before continuing.
9. 9) ENGINE MECHANICAL Check for any of the following conditions/mechanical problems. ENGINE VACUUM - must be at least 13 inches in neutral ENGINE VALVE TIMING - must be within specifications ENGINE COMPRESSION - must be within specifications ENGINE EXHAUST SYSTEM - must be free of any restrictions or leaks. ENGINE PCV SYSTEM - must flow freely TORQUE CONVERTER STALL SPEED - must be within specifications POWER BRAKE BOOSTER - no internal vacuum leaks FUEL - must be free of contamination CAM LOBES - must not be worn excessively CYLINDER LEAKAGE TEST - must be within specifications VALVE SPRINGS - cannot be weak or broken Are there any engine mechanical problems? Yes Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 16) .
10. 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 «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 11) .
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 Miller Special Tool #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 «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 16) .
12. 12) FUEL SUPPLY LINE RESTRICTED WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow these instructions can result in personal injury or death. Turn the ignition off. Raise vehicle on hoist, and disconnect the fuel pressure line at the fuel pump module. Install special tool #6539 (5/16") #6631(3/8") fuel line adapter and the fuel pressure gauge between the fuel supply line and the fuel pump module. Ignition on, engine not running. With the scan tool, actuate the ASD Fuel System test and observe the fuel pressure gauge. NOTE: Fuel pressure specification is 407 kPa +/- 34 kPa (59 psi +/- 5 psi). Is the fuel pressure within specification? Yes Repair or replace fuel supply line as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 13) .
13. 13) FUEL PUMP INLET STRAINER WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow these instructions can result in personal injury or death. Turn the ignition off. Remove the Fuel Pump Module and inspect the Fuel Inlet Strainer. Is the Fuel Inlet Strainer plugged? Yes Replace the Fuel Pump Inlet Strainer. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Before continuing, check the Fuel Pump Module harness connector terminals for corrosion, damage, or terminal push out. Make sure the ground circuit is functional. Repair as necessary. Replace the Fuel Pump Module. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
14. 14) IGNITION COIL WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death. Disconnect the Ignition Coil harness connector. Remove the Fuel Pump Relay. Using a 12-volt test light connected to 12-volts, probe the (K85) Coil Control No. 2 circuit. Crank the engine for 5 seconds while observing the test light. NOTE: The resistance of the 3.7L and 4.7L Primary Ignition coil is 0.6 to 0.9 of an ohm. NOTE: 5.7L (6.1L if applicable) Primary Ignition Coil resistance is 0.558 to 0.682 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. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 15) .
15. 15) (K85) COIL 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 Miller Special Tool #8815 to perform diagnosis. Check the (K85) Coil Control No. 2 circuit for an open, short to ground, and short to voltage. Was a problem found with the (K85) Coil Control No. 2 circuit? Yes Repair the (K85) Coil Control No. 2 circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 16) .
16. 16) POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the related Sensor, Coil, Injector, and the Powertrain Control Module (PCM). Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the related Sensors, Coils, Injectors, and the Powertrain Control Module connectors. Refer to any Technical Service Bulletins that may apply. Were there any problems found? Yes Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Replace and program the Powertrain Control Module per Service Information. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .

Scheme 215

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. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 216

1. 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 can result in personal injury or death. NOTE: Attempt to operate the vehicle under conditions similar to which the DTC was set. NOTE: It may be necessary to test drive the vehicle within the DTC monitoring conditions in order for this DTC to set. With a scan tool, select View DTCs. Is the DTC Active at this time? Yes Go to 2) . No Refer to «INTERMITTENT CONDITION»(ref-288287-S02739760862008062000000) Diagnostic Procedure.
2. 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 «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 3) .
3. 3) (F42), (A15) 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. With a scan tool, actuate the ASD Relay. Using a 12-volt test light connected to ground, probe the (F42), (A15) ASD Relay Output circuit in the Ignition Coil harness connector and Fuel Injector harness connector while the relay is actuating. Does the test light illuminate brightly? Yes Go to 4) . No Repair the excessive resistance or short to ground in the (F42), (A15) ASD Relay Output circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
4. 4) IGNITION SYSTEM OPERATION WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death. Turn the ignition off. Connect the Ignition Coil 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. NOTE: A crisp blue spark that is able to jump the gap of the spark tester should be generated. Is good spark present? Yes Go to 5) . No Go to 14) . NOTE: Connect the Fuel Injector harness connector before continuing.
5. 5) SPARK PLUG Turn the ignition off. Remove the Spark Plug. Inspect the Spark Plug for the following conditions. - Cracks - Carbon Tracking - Foreign Material - Gap size out of specifications - Loose or broken electrode NOTE: Lightly tap the bottom of the spark plug on a solid surface. The electrode in the spark plug should not move. Were any of the above conditions present? Yes Replace the Spark Plug. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 6) .
6. 6) FUEL PRESSURE CHECK WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow these instructions can result in personal injury or death. WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death. Install a fuel pressure gauge to the fuel rail. Start the engine and observe the fuel pressure reading. NOTE: Fuel pressure specification is 407 kPa +/- 34 kPa (59 psi +/- 5 psi). Choose a conclusion that best matches your fuel pressure reading. Within Specification Go to 7) . Below Specification Go to 12) . Above Specification Replace the fuel filter/pressure regulator. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
7. 7) FUEL PRESSURE LEAK DOWN NOTE: Before continuing visually and physically inspect the fuel delivery system for external leaks or damage. Repair/replace as necessary. WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow these instructions can result in personal injury or death Turn the ignition off. Install special tool #6539 (5/16") or #6631 (3/8") fuel line adapter. Install the fuel pressure gauge. Start the engine and allow the fuel system to reach maximum pressure. Turn the ignition off. NOTE: Fuel specification is 407 kPa +/- 34 kPa (59 psi +/- 5 psi). Using special tool #C4390, Hose Clamp Pliers, pinch the rubber fuel line between the fuel pressure gauge and the engine. Monitor the fuel pressure gauge for a minimum of 5 minutes. NOTE: The pressure should not fall below 241 kPa (35 psi). Does the pressure fall below the listed specification? Yes Replace the leaking Fuel Injector(s). Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 8) .
8. 8) FUEL INJECTOR OPERATION WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow these instructions can result in personal injury or death. CAUTION: After each Fuel Injector actuation, start the engine to clean the cylinder of fuel. Failure to do so could cause engine damage. Remove special tool #C4390. Start the engine and allow the fuel pressure to reach maximum pressure. Ignition on, engine not running. Using a scan tool, actuate the No. 3 Fuel Injector. Monitor the fuel pressure gauge. Does the fuel pressure gauge indicate a drop in fuel pressure? Yes Go to 9) . No Go to 10) . NOTE: Turn the ignition off, remove the Fuel Pressure gauge, and connect the fuel lines before continuing.
9. 9) ENGINE MECHANICAL Check for any of the following conditions/mechanical problems. ENGINE VACUUM - must be at least 13 inches in neutral ENGINE VALVE TIMING - must be within specifications ENGINE COMPRESSION - must be within specifications ENGINE EXHAUST SYSTEM - must be free of any restrictions or leaks. ENGINE PCV SYSTEM - must flow freely TORQUE CONVERTER STALL SPEED - must be within specifications POWER BRAKE BOOSTER - no internal vacuum leaks FUEL - must be free of contamination CAM LOBES - must not be worn excessively CYLINDER LEAKAGE TEST - must be within specifications VALVE SPRINGS - cannot be weak or broken Are there any engine mechanical problems? Yes Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 16) .
10. 10) FUEL INJECTOR Turn the ignition off. Disconnect the No. 3 Fuel Injector harness connector. Ignition on, engine not running. NOTE: When a Misfire is detected for a particular cylinder, the PCM will shut down that cylinder's Injector Control circuit. With the scan tool, erase DTCs. Install an Injector Noid light. With the scan tool, actuate the Fuel Injector. Does the Noid light blink/flicker during the actuation? Yes Verify that there is good pin to terminal contact in the Fuel Injector and the Powertrain Control Module connectors. If OK, replace the Fuel Injector. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 11) .
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 Miller Special Tool #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 «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 16) .
12. 12) FUEL SUPPLY LINE RESTRICTED WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow these instructions can result in personal injury or death. Turn the ignition off. Raise vehicle on hoist, and disconnect the fuel pressure line at the fuel pump module. Install special tool #6539 (5/16") #6631(3/8") fuel line adapter and the fuel pressure gauge between the fuel supply line and the fuel pump module. Ignition on, engine not running. With a scan tool, actuate the ASD Fuel System test and observe the fuel pressure gauge. NOTE: Fuel pressure specification is 407 kPa +/- 34 kPa (59 psi +/- 5 psi). Is the fuel pressure within specification? Yes Repair or replace fuel supply line as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 13) .
13. 13) FUEL PUMP INLET STRAINER WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow these instructions can result in personal injury or death. Turn the ignition off. Remove the Fuel Pump Module and inspect the Fuel Inlet Strainer. Is the Fuel Inlet Strainer plugged? Yes Replace the Fuel Pump Inlet Strainer. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Before continuing, check the Fuel Pump Module harness connector terminals for corrosion, damage, or terminal push out. Make sure the ground circuit is functional. Repair as necessary. Replace the Fuel Pump Module. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
14. 14) IGNITION COIL WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death. Disconnect the No. 3 Ignition Coil harness connector. Remove the Fuel Pump Relay. Using a 12-volt test light connected to 12-volts, probe the (K93) Coil Control No. 3 circuit. Crank the engine for 5 seconds while observing the test light. NOTE: The resistance of the 3.7L and 4.7L Primary Ignition coil is 0.6 to 0.9 of an ohm. NOTE: 5.7L (6.1L if applicable) Primary Ignition Coil resistance is 0.558 to 0.682 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. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 15) .
15. 15) (K93) 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 Miller Special Tool #8815 to perform diagnosis. Check the (K93) Coil Control No. 3 circuit for an open, short to ground, and short to voltage. Was a problem found with the (K93) Coil Control No. 3 circuit? Yes Repair the (K93) Coil Control No. 3 circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 16) .
16. 16) POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the related Sensor, Coil, Injector, and the Powertrain Control Module (PCM). Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the related Sensors, Coils, Injectors, and the Powertrain Control Module connectors. Refer to any Technical Service Bulletins that may apply. Were there any problems found? Yes Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Replace and program the Powertrain Control Module per Service Information. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .

Scheme 217

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. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 218

1. 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 can result in personal injury or death. NOTE: Attempt to operate the vehicle under conditions similar to which the DTC was set. NOTE: It may be necessary to test drive the vehicle within the DTC monitoring conditions in order for this DTC to set. With a scan tool, select View DTCs. Is the DTC Active at this time? Yes Go to 2) . No Refer to «INTERMITTENT CONDITION»(ref-288287-S02739760862008062000000) Diagnostic Procedure.
2. 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 «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 3) .
3. 3) (F42), (A15) ASD RELAY OUTPUT CIRCUIT Turn the ignition off. Disconnect the No. 4 Ignition Coil harness connector. Disconnect the No. 4 Fuel Injector harness connector. Ignition on, engine not running. With the scan tool, actuate the ASD Relay. Using a 12-volt test light connected to ground, probe the (F42), (A15) ASD Relay Output circuit in the Ignition Coil harness connector and Fuel Injector harness connector while the relay is actuating. Does the test light illuminate brightly? Yes Go to 4) . No Repair the excessive resistance or short to ground in the (F42), (A15) ASD Relay Output circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
4. 4) IGNITION SYSTEM OPERATION WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death. Turn the ignition off. Connect the No. 4 Ignition Coil harness connector. Remove the No. 4 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. NOTE: A crisp blue spark that is able to jump the gap of the spark tester should be generated. Is good spark present? Yes Go to 5) . No Go to 14) . NOTE: Connect the Fuel Injector harness connector before continuing.
5. 5) SPARK PLUG Turn the ignition off. Remove the Spark Plug. Inspect the Spark Plug for the following conditions. - Cracks - Carbon Tracking - Foreign Material - Gap size out of specifications - Loose or broken electrode NOTE: Lightly tap the bottom of the spark plug on a solid surface. The electrode in the spark plug should not move. Were any of the above conditions present? Yes Replace the Spark Plug. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 6) .
6. 6) FUEL PRESSURE CHECK WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow these instructions can result in personal injury or death. WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death. Install a fuel pressure gauge to the fuel rail. Start the engine and observe the fuel pressure reading. NOTE: Fuel pressure specification is 407 kPa +/- 34 kPa (59 psi +/- 5 psi). Choose a conclusion that best matches your fuel pressure reading. Within Specification Go to 7) . Below Specification Go to 12) . Above Specification Replace the fuel filter/pressure regulator. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
7. 7) FUEL PRESSURE LEAK DOWN NOTE: Before continuing visually and physically inspect the fuel delivery system for external leaks or damage. Repair / replace as necessary. WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow these instructions can result in personal injury or death Turn the ignition off. Install special tool #6539 (5/16") or #6631 (3/8") fuel line adapter. Install the fuel pressure gauge. Start the engine and allow the fuel system to reach maximum pressure. Turn the ignition off. NOTE: Fuel specification is 407 kPa +/- 34 kPa (59 psi +/- 5 psi). Using special tool #C4390, Hose Clamp Pliers, pinch the rubber fuel line between the fuel pressure gauge and the engine. Monitor the fuel pressure gauge for a minimum of 5 minutes. NOTE: The pressure should not fall below 241 kPa (35 psi) Does the pressure fall below the listed specification? Yes Replace the leaking Fuel Injector(s). Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 8) .
8. 8) FUEL INJECTOR OPERATION WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow these instructions can result in personal injury or death. CAUTION: After each Fuel Injector actuation, start the engine to clean the cylinder of fuel. Failure to do so could cause engine damage. Remove special tool #C4390. Start the engine and allow the fuel pressure to reach maximum pressure. Ignition on, engine not running. Using the scan tool, actuate the No. 4 Fuel Injector. Monitor the fuel pressure gauge. Does the fuel pressure gauge indicate a drop in fuel pressure? Yes Go to 9) . No Go to 10) . NOTE: Turn the ignition off, remove the Fuel Pressure gauge, and connect the fuel lines before continuing.
9. 9) ENGINE MECHANICAL Check for any of the following conditions/mechanical problems. ENGINE VACUUM - must be at least 13 inches in neutral ENGINE VALVE TIMING - must be within specifications ENGINE COMPRESSION - must be within specifications ENGINE EXHAUST SYSTEM - must be free of any restrictions or leaks. ENGINE PCV SYSTEM - must flow freely TORQUE CONVERTER STALL SPEED - must be within specifications POWER BRAKE BOOSTER - no internal vacuum leaks FUEL - must be free of contamination CAM LOBES - must not be worn excessively CYLINDER LEAKAGE TEST - must be within specifications VALVE SPRINGS - cannot be weak or broken Are there any engine mechanical problems? Yes Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 16) .
10. 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 «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 11) .
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 Miller Special Tool #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 «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 16) .
12. 12) FUEL SUPPLY LINE RESTRICTED WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow these instructions can result in personal injury or death. Turn the ignition off. Raise vehicle on hoist, and disconnect the fuel pressure line at the fuel pump module. Install special tool #6539 (5/16") #6631(3/8") fuel line adapter and the fuel pressure gauge between the fuel supply line and the fuel pump module. Ignition on, engine not running. With the scan tool, actuate the ASD Fuel System test and observe the fuel pressure gauge. NOTE: Fuel pressure specification is 407 kPa +/- 34 kPa (59 psi +/- 5 psi). Is the fuel pressure within specification? Yes Repair or replace fuel supply line as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 13) .
13. 13) FUEL PUMP INLET STRAINER WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow these instructions can result in personal injury or death. Turn the ignition off. Remove the Fuel Pump Module and inspect the Fuel Inlet Strainer. Is the Fuel Inlet Strainer plugged? Yes Replace the Fuel Pump Inlet Strainer. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Before continuing, check the Fuel Pump Module harness connector terminals for corrosion, damage, or terminal push out. Make sure the ground circuit is functional. Repair as necessary. Replace the Fuel Pump Module. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
14. 14) IGNITION COIL WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death. Disconnect the No. 4 Ignition Coil harness connector. Remove the Fuel Pump Relay. Using a 12-volt test light connected to 12-volts, probe the (K15) Coil Control No. 4 circuit. Crank the engine for 5 seconds while observing the test light. NOTE: The resistance of the 3.7L and 4.7L Primary Ignition coil is 0.6 to 0.9 of an ohm. NOTE: 5.7L (6.1L if applicable) Primary Ignition Coil resistance is 0.558 to 0.682 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. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 15) .
15. 15) (K15) COIL 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 Miller Special Tool #8815 to perform diagnosis. Check the (K15) Coil Control No. 4 circuit for an open, short to ground, and short to voltage. Was a problem found with the (K15) Coil Control No. 4 circuit? Yes Repair the (K15) Coil Control No. 4 circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 16) .
16. 16) POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the related Sensor, Coil, Injector, and the Powertrain Control Module (PCM). Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the related Sensors, Coils, Injectors, and the Powertrain Control Module connectors. Refer to any Technical Service Bulletins that may apply. Were there any problems found? Yes Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Replace and program the Powertrain Control Module per Service Information. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .

Scheme 219

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. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE

Scheme 220

1. 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 can result in personal injury or death. NOTE: Attempt to operate the vehicle under conditions similar to which the DTC was set. NOTE: It may be necessary to test drive the vehicle within the DTC monitoring conditions in order for this DTC to set. With a scan tool, select View DTCs. Is the DTC Active at this time? Yes Go to 2) . No Refer to «INTERMITTENT CONDITION»(ref-288287-S02739760862008062000000) Diagnostic Procedure.
2. 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 «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 3) .
3. 3) (F42), (A15) 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. With the scan tool, actuate the ASD Relay. Using a 12-volt test light connected to ground, probe the (F42), (A15) ASD Relay Output circuit in the Ignition Coil harness connector and Fuel Injector harness connector while the relay is actuating. Does the test light illuminate brightly? Yes Go to 4) . No Repair the excessive resistance or short to ground in the (F42), (A15) ASD Relay Output circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
4. 4) IGNITION SYSTEM OPERATION WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death. Turn the ignition off. Connect the Ignition Coil 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. NOTE: A crisp blue spark that is able to jump the gap of the spark tester should be generated. Is good spark present? Yes Go to 5) . No Go to 14) . NOTE: Connect the Fuel Injector harness connector before continuing.
5. 5) SPARK PLUG Turn the ignition off. Remove the Spark Plug. Inspect the Spark Plug for the following conditions. - Cracks - Carbon Tracking - Foreign Material - Gap size out of specifications - Loose or broken electrode NOTE: Lightly tap the bottom of the spark plug on a solid surface. The electrode in the spark plug should not move. Were any of the above conditions present? Yes Replace the Spark Plug. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 6) .
6. 6) FUEL PRESSURE CHECK WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow these instructions can result in personal injury or death. WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death. Install a fuel pressure gauge to the fuel rail. Start the engine and observe the fuel pressure reading. NOTE: Fuel pressure specification is 407 kPa+/- 34 kPa (59 psi +/- 5 psi). Choose a conclusion that best matches your fuel pressure reading. Within Specification Go to 7) . Below Specification Go to 12) . Above Specification Replace the fuel filter/pressure regulator. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
7. 7) FUEL PRESSURE LEAK DOWN NOTE: Before continuing visually and physically inspect the fuel delivery system for external leaks or damage. Repair / replace as necessary. WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow these instructions can result in personal injury or death. Turn the ignition off. Install special tool #6539 (5/16") or #6631 (3/8") fuel line adapter. Install the fuel pressure gauge. Start the engine and allow the fuel system to reach maximum pressure. Turn the ignition off. NOTE: Fuel specification is 407 kPa+/- 34 kPa (59 psi +/- 5 psi). Using special tool #C4390, Hose Clamp Pliers, pinch the rubber fuel line between the fuel pressure gauge and the engine. Monitor the fuel pressure gauge for a minimum of 5 minutes. NOTE: The pressure should not fall below 241 kPa (35 psi). Does the pressure fall below the listed specification? Yes Replace the leaking Fuel Injector(s). Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 8) .
8. 8) FUEL INJECTOR OPERATION WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow these instructions can result in personal injury or death. CAUTION: After each Fuel Injector actuation, start the engine to clean the cylinder of fuel. Failure to do so could cause engine damage. Remove special tool #C4390. Start the engine and allow the fuel pressure to reach maximum pressure. Ignition on, engine not running. Using the scan tool, actuate the No. 5 Fuel Injector. Monitor the fuel pressure gauge. Does the fuel pressure gauge indicate a drop in fuel pressure? Yes Go to 9) . No Go to 10) . NOTE: Turn the ignition off, remove the Fuel Pressure gauge, and connect the fuel lines before continuing.
9. 9) ENGINE MECHANICAL Check for any of the following conditions/mechanical problems. ENGINE VACUUM - must be at least 13 inches in neutral ENGINE VALVE TIMING - must be within specifications ENGINE COMPRESSION - must be within specifications ENGINE EXHAUST SYSTEM - must be free of any restrictions or leaks. ENGINE PCV SYSTEM - must flow freely TORQUE CONVERTER STALL SPEED - must be within specifications POWER BRAKE BOOSTER - no internal vacuum leaks FUEL - must be free of contamination CAM LOBES - must not be worn excessively CYLINDER LEAKAGE TEST - must be within specifications VALVE SPRINGS - cannot be weak or broken Are there any engine mechanical problems? Yes Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 16) .
10. 10) FUEL INJECTOR Turn the ignition off. Disconnect the No. 5 Fuel Injector harness connector. Ignition on, engine not running. NOTE: When a Misfire is detected for a particular cylinder, the PCM will shut down that cylinder's Injector Control circuit. With the scan tool, erase DTCs. Install an Injector Noid light. With the scan tool, actuate the Fuel Injector. Does the Noid light blink/flicker during the actuation? Yes Verify that there is good pin to terminal contact in the Fuel Injector and the Powertrain Control Module connectors. If OK, replace the Fuel Injector. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 11) .
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 Miller Special Tool #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 «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 16) .
12. 12) FUEL SUPPLY LINE RESTRICTED WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow these instructions can result in personal injury or death. Turn the ignition off. Raise vehicle on hoist, and disconnect the fuel pressure line at the fuel pump module. Install special tool #6539 (5/16") #6631(3/8") fuel line adapter and the fuel pressure gauge between the fuel supply line and the fuel pump module. Ignition on, engine not running. With the scan tool, actuate the ASD Fuel System test and observe the fuel pressure gauge. NOTE: Fuel pressure specification is 407 kPa +/- 34 kPa (59 psi +/- 5 psi). Is the fuel pressure within specification? Yes Repair or replace fuel supply line as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 13) .
13. 13) FUEL PUMP INLET STRAINER WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow these instructions can result in personal injury or death. Turn the ignition off. Remove the Fuel Pump Module and inspect the Fuel Inlet Strainer. Is the Fuel Inlet Strainer plugged? Yes Replace the Fuel Pump Inlet Strainer. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Before continuing, check the Fuel Pump Module harness connector terminals for corrosion, damage, or terminal push out. Make sure the ground circuit is functional. Repair as necessary. Replace the Fuel Pump Module. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
14. 14) IGNITION COIL WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death. Disconnect the No. 5 Ignition Coil harness connector. Remove the Fuel Pump Relay. Using a 12-volt test light connected to 12-volts, probe the (K16) Coil Control No. 5 circuit. Crank the engine for 5 seconds while observing the test light. NOTE: The resistance of the 3.7L and 4.7L Primary Ignition coil is 0.6 to 0.9 of an ohm. NOTE: 5.7L (6.1L if applicable) Primary Ignition Coil resistance is 0.558 to 0.682 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. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 15) .
15. 15) (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 Miller Special Tool #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 «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 16) .
16. 16) POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the related Sensor, Coil, Injector, and the Powertrain Control Module (PCM). Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the related Sensors, Coils, Injectors, and the Powertrain Control Module connectors. Refer to any Technical Service Bulletins that may apply. Were there any problems found? Yes Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Replace and program the Powertrain Control Module per Service Information. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .

Scheme 221

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. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 222

1. 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 can result in personal injury or death. NOTE: Attempt to operate the vehicle under conditions similar to which the DTC was set. NOTE: It may be necessary to test drive the vehicle within the DTC monitoring conditions in order for this DTC to set. With a scan tool, select View DTCs. Is the DTC Active at this time? Yes Go to 2) . No Refer to «INTERMITTENT CONDITION»(ref-288287-S02739760862008062000000) Diagnostic Procedure.
2. 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 «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 3) .
3. 3) (F42), (A15) ASD RELAY OUTPUT CIRCUIT Turn the ignition off. Disconnect the No. 6 Ignition Coil harness connector. Disconnect the No. 6 Fuel Injector harness connector. Ignition on, engine not running. With the scan tool, actuate the ASD Relay. Using a 12-volt test light connected to ground, probe the (F42), (A15) ASD Relay Output circuit in the Ignition Coil harness connector and Fuel Injector harness connector while the relay is actuating. Does the test light illuminate brightly? Yes Go to 4) . No Repair the excessive resistance or short to ground in the (F42), (A15) ASD Relay Output circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
4. 4) IGNITION SYSTEM OPERATION WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death. Turn the ignition off. Connect the Ignition Coil No. 6 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. NOTE: A crisp blue spark that is able to jump the gap of the spark tester should be generated. Is good spark present? Yes Go to 5) . No Go to 14) . NOTE: Connect the Fuel Injector harness connector before continuing.
5. 5) SPARK PLUG Turn the ignition off. Remove the Spark Plug. Inspect the Spark Plug for the following conditions. - Cracks - Carbon Tracking - Foreign Material - Gap size out of specifications - Loose or broken electrode NOTE: Lightly tap the bottom of the spark plug on a solid surface. The electrode in the spark plug should not move. Were any of the above conditions present? Yes Replace the Spark Plug. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 6) .
6. 6) FUEL PRESSURE CHECK WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow these instructions can result in personal injury or death. WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death. Install a fuel pressure gauge to the fuel rail. Start the engine and observe the fuel pressure reading. Choose a conclusion that best matches your fuel pressure reading. Within Specification Go to 7) . Below Specification Go to 12) . Above Specification Replace the fuel filter/pressure regulator. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . NOTE: Fuel pressure specification is 407 kPa +/- 34 kPa (59 psi +/- 5 psi).
7. 7) FUEL PRESSURE LEAK DOWN NOTE: Before continuing visually and physically inspect the fuel delivery system for external leaks or damage. Repair/replace as necessary. WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow these instructions can result in personal injury or death Turn the ignition off. Install special tool #6539 (5/16") or #6631 (3/8") fuel line adapter. Install the fuel pressure gauge. Start the engine and allow the fuel system to reach maximum pressure. Turn the ignition off. NOTE: Fuel specification is 407 kPa +/- 34 kPa (59 psi +/- 5 psi). Using special tool #C4390, Hose Clamp Pliers, pinch the rubber fuel line between the fuel pressure gauge and the engine. Monitor the fuel pressure gauge for a minimum of 5 minutes. NOTE: The pressure should not fall below 241 kPa (35 psi). Does the pressure fall below the listed specification? Yes Replace the leaking Fuel Injector(s). Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 8) .
8. 8) FUEL INJECTOR OPERATION WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow these instructions can result in personal injury or death. CAUTION: After each Fuel Injector actuation, start the engine to clean the cylinder of fuel. Failure to do so could cause engine damage. Remove special tool #C4390. Start the engine and allow the fuel pressure to reach maximum pressure. Ignition on, engine not running. Using the scan tool, actuate the No. 6 Fuel Injector. Monitor the fuel pressure gauge. Does the fuel pressure gauge indicate a drop in fuel pressure? Yes Go to 9) . No Go to 10) . NOTE: Turn the ignition off, remove the Fuel Pressure gauge, and connect the fuel lines before continuing.
9. 9) ENGINE MECHANICAL Check for any of the following conditions/mechanical problems. ENGINE VACUUM - must be at least 13 inches in neutral ENGINE VALVE TIMING - must be within specifications ENGINE COMPRESSION - must be within specifications ENGINE EXHAUST SYSTEM - must be free of any restrictions or leaks. ENGINE PCV SYSTEM - must flow freely TORQUE CONVERTER STALL SPEED - must be within specifications POWER BRAKE BOOSTER - no internal vacuum leaks FUEL - must be free of contamination CAM LOBES - must not be worn excessively CYLINDER LEAKAGE TEST - must be within specifications VALVE SPRINGS - cannot be weak or broken Are there any engine mechanical problems? Yes Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 16) .
10. 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 «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 11) .
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 Miller Special Tool #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 «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 16) .
12. 12) FUEL SUPPLY LINE RESTRICTED WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow these instructions can result in personal injury or death. Turn the ignition off. Raise vehicle on hoist, and disconnect the fuel pressure line at the fuel pump module. Install special tool #6539 (5/16") #6631(3/8") fuel line adapter and the fuel pressure gauge between the fuel supply line and the fuel pump module. Ignition on, engine not running. With the scan tool, actuate the ASD Fuel System test and observe the fuel pressure gauge. NOTE: Fuel pressure specification is 407 kPa +/- 34 kPa (59 psi +/- 5 psi). Is the fuel pressure within specification? Yes Repair or replace fuel supply line as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 13) .
13. 13) FUEL PUMP INLET STRAINER WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow these instructions can result in personal injury or death. Turn the ignition off. Remove the Fuel Pump Module and inspect the Fuel Inlet Strainer. Is the Fuel Inlet Strainer plugged? Yes Replace the Fuel Pump Inlet Strainer. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Before continuing, check the Fuel Pump Module harness connector terminals for corrosion, damage, or terminal push out. Make sure the ground circuit is functional. Repair as necessary. Replace the Fuel Pump Module. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
14. 14) IGNITION COIL WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death. Disconnect the No. 6 Ignition Coil harness connector. Remove the Fuel Pump Relay. Using a 12-volt test light connected to 12-volts, probe the (K10) Coil Control No. 6 circuit. Crank the engine for 5 seconds while observing the test light. NOTE: The resistance of the 3.7L and 4.7L Primary Ignition coil is 0.6 to 0.9 of an ohm. NOTE: 5.7L (6.1L if applicable) Primary Ignition Coil resistance is 0.558 to 0.682 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. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 15) .
15. 15) (K10) COIL 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 Miller Special Tool #8815 to perform diagnosis. Check the (K10) Coil Control No. 6 circuit for an open, short to ground, and short to voltage. Was a problem found with the (K10) Coil Control No. 6 circuit? Yes Repair the (K10) Coil Control No. 6 circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 16) .
16. 16) POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the related Sensor, Coil, Injector, and the Powertrain Control Module (PCM). Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the related Sensors, Coils, Injectors, and the Powertrain Control Module connectors. Refer to any Technical Service Bulletins that may apply. Were there any problems found? Yes Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Replace and program the Powertrain Control Module per Service Information. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .

Scheme 223

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. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 224

Scheme 225

Scheme 226

1. 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 can result in personal injury or death. NOTE: Attempt to operate the vehicle under conditions similar to which the DTC was set. NOTE: It may be necessary to test drive the vehicle within the DTC monitoring conditions in order for this DTC to set. With a scan tool, select View DTCs. Is the DTC Active at this time? Yes Go to 2) . No Refer to «INTERMITTENT CONDITION»(ref-288287-S02739760862008062000000) Diagnostic Procedure.
2. 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 «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 3) .
3. 3) (F42), (A15) 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. With the scan tool, actuate the ASD Relay. Using a 12-volt test light connected to ground, probe the (F42), (A15) ASD Relay Output circuit in the Ignition Coil harness connector and Fuel Injector harness connector while the relay is actuating. Does the test light illuminate brightly? Yes Go to 4) . No Repair the excessive resistance or short to ground in the (F42), (A15) ASD Relay Output circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
4. 4) IGNITION SYSTEM OPERATION WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death. Turn the ignition off. Connect the Ignition Coil 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. Is good spark present? Yes Go to 5) . No Go to 14) . NOTE: Connect the Fuel Injector harness connector before continuing.
5. 5) SPARK PLUG Turn the ignition off. Remove the Spark Plug. Inspect the Spark Plug for the following conditions. - Cracks - Carbon Tracking - Foreign Material - Gap size out of specifications - Loose or broken electrode NOTE: Lightly tap the bottom of the spark plug on a solid surface. The electrode in the spark plug should not move. Were any of the above conditions present? Yes Replace the Spark Plug. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 6) .
6. 6) FUEL PRESSURE CHECK WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow these instructions can result in personal injury or death. WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death. Install a fuel pressure gauge to the fuel rail. Start the engine and observe the fuel pressure reading. NOTE: Fuel pressure specification is 407 kPa +/- 34 kPa (59 psi +/- 5 psi). Choose a conclusion that best matches your fuel pressure reading. Within Specification Go to 7) . Below Specification Go to 12) . Above Specification Replace the fuel filter/pressure regulator. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
7. 7) FUEL PRESSURE LEAK DOWN NOTE: Before continuing visually and physically inspect the fuel delivery system for external leaks or damage. Repair/replace as necessary. WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow these instructions can result in personal injury or death. Turn the ignition off. Install special tool #6539 (5/16") or #6631 (3/8") fuel line adapter. Install the fuel pressure gauge. Start the engine and allow the fuel system to reach maximum pressure. Turn the ignition off. NOTE: Fuel specification is 407 kPa +/- 34 kPa (59 psi +/- 5 psi). Using special tool #C4390, Hose Clamp Pliers, pinch the rubber fuel line between the fuel pressure gauge and the engine. Monitor the fuel pressure gauge for a minimum of 5 minutes. NOTE: The pressure should not fall below 241 kPa (35 psi). Does the pressure fall below the listed specification? Yes Replace the leaking Fuel Injector(s). Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 8) .
8. 8) FUEL INJECTOR OPERATION WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow these instructions can result in personal injury or death. CAUTION: After each Fuel Injector actuation, start the engine to clean the cylinder of fuel. Failure to do so could cause engine damage. Remove special tool #C4390. Start the engine and allow the fuel pressure to reach maximum pressure. Ignition on, engine not running. Using the scan tool, actuate the No. 7 Fuel Injector. Monitor the fuel pressure gauge. Does the fuel pressure gauge indicate a drop in fuel pressure? Yes Go to 9) . No Go to 10) . NOTE: Turn the ignition off, remove the Fuel Pressure gauge, and connect the fuel lines before continuing.
9. 9) ENGINE MECHANICAL Check for any of the following conditions/mechanical problems. ENGINE VACUUM - must be at least 13 inches in neutral ENGINE VALVE TIMING - must be within specifications ENGINE COMPRESSION - must be within specifications ENGINE EXHAUST SYSTEM - must be free of any restrictions or leaks. ENGINE PCV SYSTEM - must flow freely TORQUE CONVERTER STALL SPEED - must be within specifications POWER BRAKE BOOSTER - no internal vacuum leaks FUEL - must be free of contamination CAM LOBES - must not be worn excessively CYLINDER LEAKAGE TEST - must be within specifications VALVE SPRINGS - cannot be weak or broken Are there any engine mechanical problems? Yes Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 16) .
10. 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 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 «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 11) .
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 Miller Special Tool #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 «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 16) .
12. 12) FUEL SUPPLY LINE RESTRICTED WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow these instructions can result in personal injury or death. Turn the ignition off. Raise vehicle on hoist, and disconnect the fuel pressure line at the fuel pump module. Install special tool #6539 (5/16") #6631(3/8") fuel line adapter and the fuel pressure gauge between the fuel supply line and the fuel pump module. Ignition on, engine not running. With the scan tool, actuate the ASD Fuel System test and observe the fuel pressure gauge. NOTE: Fuel pressure specification is 407 kPa +/- 34 kPa (59 psi +/- 5 psi). Is the fuel pressure within specification? Yes Repair or replace fuel supply line as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 13) .
13. 13) FUEL PUMP INLET STRAINER WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow these instructions can result in personal injury or death. Turn the ignition off. Remove the Fuel Pump Module and inspect the Fuel Inlet Strainer. Is the Fuel Inlet Strainer plugged? Yes Replace the Fuel Pump Inlet Strainer. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Before continuing, check the Fuel Pump Module harness connector terminals for corrosion, damage, or terminal push out. Make sure the ground circuit is functional. Repair as necessary. Replace the Fuel Pump Module. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
14. 14) IGNITION COIL WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death. Disconnect the No. 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. Crank the engine for 5 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). NOTE: 5.7L (6.1L if applicable) Primary Ignition Coil resistance is 0.558 to 0.682 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. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 15) .
15. 15) (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 Miller Special Tool #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 «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 16) .
16. 16) POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the related Sensor, Coil, Injector, and the Powertrain Control Module (PCM). Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the related Sensors, Coils, Injectors, and the Powertrain Control Module connectors. Refer to any Technical Service Bulletins that may apply. Were there any problems found? Yes Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Replace and program the Powertrain Control Module per Service Information. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .

Scheme 227

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. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 228

Scheme 229

Scheme 230

1. 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 can result in personal injury or death. NOTE: Attempt to operate the vehicle under conditions similar to which the DTC was set. NOTE: It may be necessary to test drive the vehicle within the DTC monitoring conditions in order for this DTC to set. With a scan tool, select View DTCs. Is the DTC Active at this time? Yes Go to 2) . No Refer to «INTERMITTENT CONDITION»(ref-288287-S02739760862008062000000) Diagnostic Procedure.
2. 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 «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 3) .
3. 3) (F42), (A15) 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. With the scan tool, actuate the ASD Relay. Using a 12-volt test light connected to ground, probe the (F42), (A15) ASD Relay Output circuit in the Ignition Coil harness connector and Fuel Injector harness connector while the relay is actuating. Does the test light illuminate brightly? Yes Go to 4) . No Repair the excessive resistance or short to ground in the (F42), (A15) ASD Relay Output circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
4. 4) IGNITION SYSTEM OPERATION WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death. Turn the ignition off. Connect the Ignition Coil 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. NOTE: A crisp blue spark that is able to jump the gap of the spark tester should be generated. Is good spark present? Yes Go to 5) . No Go to 14) . NOTE: Connect the Fuel Injector harness connector before continuing.
5. 5) SPARK PLUG Turn the ignition off. Remove the Spark Plug. Inspect the Spark Plug for the following conditions. - Cracks - Carbon Tracking - Foreign Material - Gap size out of specifications - Loose or broken electrode NOTE: Lightly tap the bottom of the spark plug on a solid surface. The electrode in the spark plug should not move. Were any of the above conditions present? Yes Replace the Spark Plug. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 6) .
6. 6) FUEL PRESSURE CHECK WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow these instructions can result in personal injury or death. Install a fuel pressure gauge to the fuel rail. Start the engine and observe the fuel pressure reading. NOTE: Fuel pressure specification is 407 kPa +/- 34 kPa (59 psi +/- 5 psi). Choose a conclusion that best matches your fuel pressure reading. Within Specification Go to 7) . Below Specification Go to 12) . Above Specification Replace the fuel filter/pressure regulator. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
7. 7) FUEL PRESSURE LEAK DOWN NOTE: Before continuing visually and physically inspect the fuel delivery system for external leaks or damage. Repair/replace as necessary. WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow these instructions can result in personal injury or death. Turn the ignition off. Install special tool #6539 (5/16") or #6631 (3/8") fuel line adapter. Install the fuel pressure gauge. Start the engine and allow the fuel system to reach maximum pressure. Turn the ignition off. NOTE: Fuel specification is 407 kPa +/- 34 kPa (59 psi +/- 5 psi). Using special tool #C4390, Hose Clamp Pliers, pinch the rubber fuel line between the fuel pressure gauge and the engine. Monitor the fuel pressure gauge for a minimum of 5 minutes. NOTE: The pressure should not fall below 241 kPa (35 psi). Does the pressure fall below the listed specification? Yes Replace the leaking Fuel Injector(s). Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 8) .
8. 8) FUEL INJECTOR OPERATION WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow these instructions can result in personal injury or death. CAUTION: After each Fuel Injector actuation, start the engine to clean the cylinder of fuel. Failure to do so could cause engine damage. Remove special tool #C4390. Start the engine and allow the fuel pressure to reach maximum pressure. Ignition on, engine not running. Using the scan tool, actuate the No. 8 Fuel Injector. Monitor the fuel pressure gauge. Does the fuel pressure gauge indicate a drop in fuel pressure? Yes Go to 9) . No Go to 10) . NOTE: Turn the ignition off, remove the Fuel Pressure gauge, and connect the fuel lines before continuing.
9. 9) ENGINE MECHANICAL Check for any of the following conditions/mechanical problems. ENGINE VACUUM - must be at least 13 inches in neutral ENGINE VALVE TIMING - must be within specifications ENGINE COMPRESSION - must be within specifications ENGINE EXHAUST SYSTEM - must be free of any restrictions or leaks. ENGINE PCV SYSTEM - must flow freely TORQUE CONVERTER STALL SPEED - must be within specifications POWER BRAKE BOOSTER - no internal vacuum leaks FUEL - must be free of contamination CAM LOBES - must not be worn excessively CYLINDER LEAKAGE TEST - must be within specifications VALVE SPRINGS - cannot be weak or broken Are there any engine mechanical problems? Yes Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 16) .
10. 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 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 «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 11) .
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 Miller Special Tool #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 «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 16) .
12. 12) FUEL SUPPLY LINE RESTRICTED WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow these instructions can result in personal injury or death. Turn the ignition off. Raise vehicle on hoist, and disconnect the fuel pressure line at the fuel pump module. Install special tool #6539 (5/16") #6631(3/8") fuel line adapter and the fuel pressure gauge between the fuel supply line and the fuel pump module. Ignition on, engine not running. With the scan tool, actuate the ASD Fuel System test and observe the fuel pressure gauge. NOTE: Fuel pressure specification is 407 kPa +/- 34 kPa (59 psi +/- 5 psi). Is the fuel pressure within specification? Yes Repair or replace fuel supply line as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 13) .
13. 13) FUEL PUMP INLET STRAINER WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow these instructions can result in personal injury or death. Turn the ignition off. Remove the Fuel Pump Module and inspect the Fuel Inlet Strainer. Is the Fuel Inlet Strainer plugged? Yes Replace the Fuel Pump Inlet Strainer. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Before continuing, check the Fuel Pump Module harness connector terminals for corrosion, damage, or terminal push out. Make sure the ground circuit is functional. Repair as necessary. Replace the Fuel Pump Module. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .
14. 14) IGNITION COIL WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death. Disconnect the No. 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. Crank the engine for 5 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). NOTE: 5.7L (6.1L if applicable) Primary Ignition Coil resistance is 0.558 to 0.682 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. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 15) .
15. 15) (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 Miller Special Tool #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 «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Go to 16) .
16. 16) POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the related Sensor, Coil, Injector, and the Powertrain Control Module (PCM). Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the related Sensors, Coils, Injectors, and the Powertrain Control Module connectors. Refer to any Technical Service Bulletins that may apply. Were there any problems found? Yes Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) . No Replace and program the Powertrain Control Module per Service Information. Perform «POWERTRAIN VERIFICATION TEST»(ref-288299-S34942598282008062000000) .

Scheme 231

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. Two Trip Fault. Three good trips to turn off the MIL.

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