Test Description

WARNING: This page is about a different car, the 2003 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers in the diagnostic procedures.

1 - The Diagnostic System Check - Engine Controls prompts the technician to complete some basic checks and store freeze frame data, if applicable. This creates an electronic copy of data taken when fault occurred. Information is then stored in the scan tool for later reference.
2 - This step verifies whether misfire is present. The scan tool will display increasing counts in TOTAL MISFIRE CURRENT COUNT parameter, if a misfire is occurring.
3 - This step checks whether DTC P0300 is the result of a hard failure or an intermittent condition. Operating vehicle in CHECK MODE enhances diagnostic capabilities of PCM. Scan tool will display increasing counts in TOTAL MISFIRE CURRENT COUNT parameter if a misfire is occurring.
4 - Fault not present indicates that condition(s) that caused DTC P0300 to set is intermittent and not currently present. If no other DTCs are stored, refer to DIAGNOSTIC AIDS for additional information on diagnosing an intermittent DTC P0300.
12 - Contaminants in fuel, such as alcohol or water, can create a misfire condition.
13 - A vacuum leak can cause a lean misfire condition.