Accelerator Pedal Position System Description
WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
The accelerator pedal position (APP) sensor is mounted inside the accelerator pedal control assembly. The sensor is made up of the two individual sensors within a single housing. Each sensor has a unique functionality to determine pedal position.
The accelerator pedal position (APP) system along with the engine control module (ECM) is used to calculate and control the amount of acceleration and deceleration through fuel injector control.