Diagnostic Aids

An open, a short to voltage, a short to ground or a defective sensor inside distributor can prevent reference voltage from pulsing at ECM resolution terminal. If Code 36 is present and vehicle still does not start, check for Code 16 and use that chart first. If vehicle still will not start, go to NO START - ENGINE CRANKS OKAY in BASIC TESTING article in this section.

Fig 1: Code 36 Schematic (5.7L "Y" Body) Opti-Spark Ignition System (High Resolution Pulse)

Fig 2: Code 36 Flow Chart Opti-Spark Ignition System (High Resolution Pulse)