Accelerator Pedal Position Sensor: Description: Description
WARNING: This page is about a different car, the 2007 Jeep Patriot and 2007 Jeep Compass. However, it is still accessible from the selected car via links, so may be relevant.
The Accelerator Pedal Position Sensor (APPS) is a variable resistor that provides the PCM with an input signal (voltage). The signal represents pedal angle position. As the position of the accelerator pedal changes, the resistance of the APPS changes.