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: Observe IAT on Tech-1 while moving related connectors and wiring harness with warm engine running. If failure is induced, IAT display will change to a -40° temperature reading. This may assist in isolating the location of the malfunction.