Accelerator Pedal (AP) Position Sensor:

Courtesy of VOLVO CARS CORPORATION

The accelerator pedal position sensor is located with the accelerator pedal. The sensor transmits a PWM signal to the Engine Control Module (ECM) and an analog signal to the Central Electronic Module (CEM). The signal is proportional to how far down the accelerator pedal is pressed. The sensor is powered and grounded via the Central Electronic Module (CEM). The sensor has a separate ground for the PWM signal.

For further information, see DESIGN AND FUNCTION, ENGINE CONTROL MODULE (ECM) .