Diagnostic Aids
An intermittent may be caused by a poor connection, rubbed through wire insulation or a wire broken inside the insulation. Check for:
- Poor Connection Or Damaged Harness: Inspect PCM harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, poor terminal to wire connection and damaged harness.
- Intermittent Test: Monitor Tech 1 while moving related connectors and wiring harness. If failure is induced, scan data will change from low to high, or high to low. This may assist in isolating the location of the malfunction.