Generic
Type:
    Powertrain - Ignition System or Misfire - ISO/SAE Controlled
Description:
    Ignition/Distributor Engine Speed Input Circuit Range/Performance

GM
Type:
    Powertrain - Ignition System or Misfire - ISO/SAE Controlled
Description:
    1C Module Spark Reference Circuit Conditions
Cause:
    Engine running below 1200 rpm, then the PCM detected 150 fuel control pulses with no spark reference (no 18X CKP pulses) signals