Diagnostic Aids

A skewed MAP sensor signal may cause PCM to incorrectly determine that the TP sensor is out of range. Check for an unusually low or high MAP sensor reading. If DTC is determined to be intermittent or TP sensor system is still suspect, go to DTC P1121: THROTTLE POSITION SENSOR CIRCUIT INTERMITTENT HIGH VOLTAGE  and/or INTERMITTENTS in appropriate TROUBLE SHOOTING - NO CODES article.