Intermittent Condition
WARNING:
When the engine is operating, DO NOT stand in a direct line with the fan. DO NOT put your hands near the pulleys, belts or fan. DO NOT wear loose clothing.
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.
The conditions that set the DTC are not present at this time. The following list may help in identifying the intermittent condition:
- Refer to any Technical Service Bulletin (TSB) that may apply.
- Review the DRBIII(R) Freeze Frame information to identify under what conditions the DTC set.
- With the engine running at normal operating temperature, monitor the DRBIII(R) parameters related to the DTC while wiggling the wiring harness. Look for parameter values to change and/or a DTC to set.
- Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or partially broken wires.
- Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, or corroded terminals.
- Inspect and clean all PCM, engine and chassis grounds.
- If several DTCs were set, use a wiring diagram to help locate any common ground or supply circuits. See appropriate WIRING DIAGRAMS article.
- For any relay DTCs, actuate the relay with the DRBIII(R) and wiggle the related wiring harness to try to interrupt the actuation.
- For intermittent Evaporative Emission (EVAP) DTCs, perform a visual and physical inspection of the related parts including hoses and fuel cap.
- A copilot data recording and/or a lab scope should be used to help diagnose intermittent conditions.
- Use the DRBIII(R) to perform a System Test if one applies to suspect component.
Were any of the above conditions present? If yes, repair as necessary. If no, procedure is complete.