Diagnostic Aids
WARNING: This page is about a different car, the 2002 Pontiac Grand Am, 2002 Oldsmobile Alero, 2002 Chevrolet Monte Carlo, and 2002 Chevrolet Impala. However, it is still accessible from the selected car via links, so may be relevant.
Check for any of the following conditions:
- A skewed MAP signal may cause the PCM to incorrectly determine the TP sensor is out of range. Inspect for an unusually low or high MAP reading.
If the DTC is determined to be intermittent or TP sensor system is still suspect, refer to DTC P1121: TP SENSOR CIRCUIT INTERMITTENT HIGH VOLTAGE .