Location
Integrated into the accelerator pedal
Function
The PCM needs the accelerator pedal position in order to control engine power according to driver input.
The APP sensor houses a total of three sliding contact potentiometers.
Effects of faults
Failure of a potentiometer has no influence on engine operation. Only one DTC is (as a rule) stored in the fault memory.
If two or three potentiometers fail, continued driving is only possible at engine idle speed
Diagnosis
The monitoring system checks:
โข the sensor for short circuit to ground/battery and open control loop.
โข the values of the individual potentiometers for plausibility.