Diagnostic Aids
An intermittent may be caused by a poor connection, rubbed-through wire insulation or wire broken inside insulation. 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. Monitor Tech 1 while moving related connectors and wiring harness. If failure is induced, reading will change. This may assist in isolating the location of the malfunction.