Intermittent Condition: Wiring Diagram
For complete wiring diagrams, refer to SYSTEM WIRING DIAGRAMS .
- INTERMITTENT CONDITION NOTE: The conditions that set the DTC are not present at this time. The following list may help in identifying the intermittent condition.WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts or fan. Do not wear loose clothing. Failure to follow these instructions may result in possible serious or fatal injury.
- Perform any Technical Service Bulletins (TSBs) that may apply.
- Review the scan tool Freeze Frame information. If possible, try to duplicate the conditions under which the DTC set.
- Turn the ignition off.
- Visually inspect the related wire harness. Wiggle the related wire harness and look for an interrupted signal on the affected circuit. Disconnect all the related harness connectors. Look for any chafed, pierced, pinched, partially broken wires and broken, bent, pushed out, or corroded terminals.
- Perform a voltage drop test on the related circuits between the suspected inoperative component and the Anti-Lock Brake Module, Front Control Module, or Totally Integrated Power Module, which every applies to the circuits in questions.
- Inspect and clean all Powertrain Control Module (PCM), APS, engine, and chassis grounds that are related to the most current DTC.
- If numerous trouble codes were set, use a wire schematic and look for any common ground or supply circuits
- For any Relay DTCs, actuate the Relay with the scan tool and wiggle the related wire harness to try to interrupt the actuation.
- Use the scan tool to perform a System Test if one applies to failing component.
- A co-pilot, data recorder, and/or lab scope should be used to help diagnose intermittent conditions.
Were any problems found during the above inspections?
Yes
- Perform the necessary repairs.
- Perform the APS VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
No
- Test Complete.