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 an EGR, EVAP purge solenoid, fuel injector, HO2S sensor 1 or MAF sensor DTC is also set, diagnose that DTC first.

The ECM will set a DTC P0300 even if a specific cylinder is misfiring. If a specific cylinder misfire is also set, diagnose that DTC first.

If a specific cylinder misfire occurs for longer than 15 seconds, the ECM will command the fuel injector Off for the rest of the ignition cycle even if the fault is corrected.

The ECM automatically and continuously learns the crankshaft variation between notches under all engine speeds and loads. No manual procedure is required.

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.

The misfire history counters will only be erased when DTCs are cleared using scan tool.

Fuel pressure: 39-49 psi.
EGR sensor closed position value range: 0.5-1.0 volts.
Spark plug gap: 0.045", not adjustable.