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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 116 (Engine Controls - Self-Diagnostics - 2.2L) >> Diagnostic Tests >> DTC P0300-P0304: Cylinders No. 1-4 Misfire Detected >> Diagnostic Aids

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 set, diagnose that DTC first.

ECM will set a DTC P0300 first, even if a specific cylinder is misfiring. If a specific cylinder misfires for a certain length of time, a specific cylinder misfire will then set.

If vehicle has had a prior replacement of a ECM or crankshaft sensor, crankshaft must be relearned. Perform CRANKSHAFT POSITION VARIATION LEARN PROCEDURE  under PROGRAMMING.

Torque converter may be momentarily disabled to determine if misfire was due to a rough road (A/T).

Use scan tool to monitor MISFIRE CURRENT CYLS #1-4 while simulating different engine load conditions in the stall. Scan tool active misfire counter should pick up intermittent misfire conditions.

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