Accelerator Pedal Position Sensor: Description and Operation

COMPONENT PARTS


Accelerator Pedal Position Sensor






The accelerator pedal position (APP) sensor is installed on the accelerator pedal assembly. The sensor detects the accelerator position and sends a signal to the ECM.
Accelerator pedal position sensor has two sensors. These sensors are a kind of potentiometer which transform the accelerator pedal position into output voltage, and emit the voltage signals to the ECM.
The ECM judges the current opening angle of the accelerator pedal from these signals and controls the throttle control motor based on these signals.
Idle position of the accelerator pedal is determined by the ECM receiving the signal from the accelerator pedal position sensor. The
ECM uses this signal for engine operations such as fuel cut.