Code 36, OPTI-Spark High Resolution Pulse: Notes

Ignition system supplies 2 timing inputs to PCM, a high resolution signal (360 pulses per camshaft revolution) and a low resolution signal (8 pulses per camshaft revolution). PCM can determine if either timing input is not being received by comparing inputs. If PCM detects 40 low resolution pulse without detecting high pulse, Code 36 will set. Reference signal on resolution line toggles between zero and 5 volts as camshaft turns.

1. Determines if code is intermittent.
2. 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.
3. 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.