Test Description
WARNING: This page is about a different car, the 2002 Oldsmobile Intrigue and 2002 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.
The numbers below refer to the step number in the diagnostic procedures.
- 3
Engine misfire can change the engine load characteristics which may affect the TP sensor performance diagnosis. Before diagnosing DTC P0121, correct any misfire. The following conditions may cause a misfire DTC to be set: The CKP system variation is not learned, an intermittent CKP sensor concern, incorrect rough road data from the Electronic Brake Control Module (EBCM), and/or a faulty injector circuit. Before using the DTC P0300 diagnostic test procedure, diagnose and repair any other DTCs. - 4
The Misfire Current Cyl display may display a small amount of activity, but should not steadily increment during an entire test period. - 5
A misfiring cylinder or a non-firing cylinder can sometimes affect the misfire counters for other cylinders. When performing this diagnosis, concentrate on the cylinder with the highest level of misfire, and correct the concern. This may also correct the other cylinders that indicate misfire. This step splits the test between the conditions that would cause a specific cylinder to misfire and the conditions that would affect all cylinders.