Diagnostic Aids

Check for a shorted MIL control circuit between instrument cluster and PCM. A shorted instrument cluster printed circuit board may cause MIL to remain illuminated. Check for a poor connection to PCM.

An intermittent malfunction may be caused by a poor connection, rubbed-through wire insulation, or a wire broken inside insulation. Inspect harness connectors for backed-out terminals, improper mating, broken locks, improperly formed or damaged terminals, or poor terminal-to-wire connections before component replacement.