Non-Monitored Circuits
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Powertrain Control Module (PCM) does not monitor all circuits, conditions and systems that could cause a malfunction or driveability problem. However, problems with these systems may cause PCM to store DTCs for other systems or components.
For example, a fuel pressure problem will not cause a Diagnostic Trouble Code (DTC) directly, but could cause a rich/lean condition or misfire which may cause PCM to store an oxygen sensor DTC. The major non-monitored circuits are identified as follows.
- Cylinder Compression
- Excessive Oil Consumption
- Exhaust System
- Fuel Injector Mechanical Faults
- Fuel Pressure
- PCM Connector Engagement
- PCM System Ground
- Secondary Ignition System
- Throttle Body Airflow
- Vacuum Assist