Accelerator Pedal Position Sensor
WARNING: This page does not describe the selected car, but rather 33 other vehicles, including the 2002 Saturn Vue, 2002 Pontiac Montana, 2002 Pontiac Aztek, 2002 Oldsmobile Silhouette, and 2002 Oldsmobile Bravada. However, it is still accessible from the selected car via links, so may be relevant.
The Accelerator Pedal Position (APP) sensor, mounted on accelerator pedal, contains 3 separate variable resistor circuits that monitor throttle opening angle for PCM. Each APP circuit, connected to a 5-volt reference signal, has a high resistance value when throttle is closed. At wide open throttle, sensor resistance value is low and output to PCM will be about 5 volts.