Diagnostic Aids
WARNING: This page is about a different car, the 2002 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
If a fuel injector DTC is also set, diagnose that DTC first.
The ECM will set a DTC P0300 even if a specific cylinder is misfiring.
The scan tool contains the SPECIAL FUNCTION, IGNITION COIL CYL. 1-6, which can individually fire the spark plugs. An audible spark plug fire sound can be heard to determine if each cylinder ignition system is functioning correctly.
Use scan tool to monitor MISFIRE CURRENT CYL. #1-6 while simulating different engine load conditions in the stall. The scan tool active misfire counter should pick up intermittent misfire conditions.
- Fuel injector resistance: 15.1-15.9 ohms at 70°F (21°C); or all fuel injector resistances within 1 ohm of each other at the same temperature.
- Spark plug gap: 0.045", not adjustable.
NOTE:
The misfire history counters will only be erased when DTCs are cleared using scan tool.