Test Description

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

1. 2
   
   Engine misfire can change engine load characteristics which may affect the Throttle Position (TP) sensor performance diagnostic. Correct any misfire before diagnosing. A malfunctioning injector circuit, crankshaft position system variation not learned, an intermittent CKP sensor problem, incorrect rough road data from the Electronic Brake Control Module (EBCM), etc. may cause a misfire DTC to be set. If any other DTCs are set with DTC P0300, diagnose and repair the other DTC before using the DTC P0300 table.
2. 3
   
   The Misfire Bar Graph (or Misfire Current Cyl #) display may normally display a small amount of activity (0-10 counts) but should not steadily increment during an entire 200 revolution test sample period.
3. 4
   
   A misfiring cylinder can sometimes affect the misfire counters for other cylinders. When performing this table, concentrating on the cylinder with the highest level of misfire and correcting the problem, may also correct the other cylinders that indicate misfire. This step splits the table between conditions that would cause a specific cylinder to misfire and conditions that would affect all cylinders, causing a random multiple cylinder misfire.