Diagnostic Aids
An open in injector drive or "peak and hold" circuits or PCM drive circuits shorted to voltage will cause a Code 65 to be set and also cause misfire due to an inoperative pair of injectors. "Peak and hold" circuits shorted to ground will cause a Code 65 to set while allowing injectors to pulse. An intermittent problem would have to be present for at least 20 seconds to set Code 65.