Test Description

NOTE: Test numbers refer to numbers on diagnostic chart.

Determines if code is intermittent.
This step determines if PCM is sending out a signal to distributor for processing. If this signal is not available or is shorted to ground or voltage, distributor cannot ground it to produce reference pulses.
If Code 41 and/or 42 is set with Code 36 and no external fault can be found, replace PCM. If Code 36 is set alone and distributor connections are okay, replace distributor.

Fig 1: Code 36 Schematic (Corvette) Opti-Spark High Resolution Pulse

Fig 2: Code 36 Diagnostic Flow Chart (Corvette) Opti-Spark High Resolution Pulse