Accelerator Pedal (AP) Position Sensor
WARNING: This page is about a different car, the 2010 Volvo V70, 2009 Volvo V70, and 2008 Volvo V70. However, it is still accessible from the selected car via links, so may be relevant.
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.