Diagnostic Aids

An open or shorted injector circuit will cause a misfire DTC to set. Diagnose an injector DTC first if an injector and a misfire DTC are set at same time. Fuel present in oil is a good suspect of a leaking or grounded injector.

Check for conditions or faulty components which could cause an engine misfire. See appropriate TROUBLE SHOOTING - NO CODES article. 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.