Accelerator Pedal Position Sensor: Description and Operation

Accelerator Pedal Position (APP) Sensor:

The Accelerator Pedal Position (APP) module contains three potentiometers (a device for measuring an unknown voltage or potential difference by comparison to a standard voltage). Each of the APP sensors send a varying voltage to the Powertrain Control Module (PCM). By monitoring the output voltage from the Accelerator Pedal Position (APP) module, the PCM can determine fuel delivery based on the accelerator pedal position (driver demand).