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 mounted together with the accelerator pedal. The sensor transmits a pulse width modulated signal that is proportional to how much the pedal is depressed. The sensor is directly connected to the central electronic module (CEM), which forwards the sensor value out onto the CAN network. The central electronic module (CEM) only uses the signal to be able to generate a diagnostic trouble code should any sensor output signals fall outside of specified values.