Circuit Description
WARNING: This page is about a different car, the 2003 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
The Accelerator Pedal Position (APP) sensors No. 1 and No. 2 are located within the accelerator pedal assembly. Each sensor has a 5-volt reference circuit, a low reference circuit and a signal circuit.
The APP sensor provides the Engine Control Module (ECM) with a signal voltage proportional to accelerator pedal movement. The APP sensor No. 1 signal voltage at rest position is near the low reference and increases as the pedal is actuated. The APP sensor No. 2 signal voltage at rest position is about 5-volt reference and decreases as the pedal is actuated. DTC will set when the voltage difference between APP sensors No. 1 and No. 2 exceeds a predetermined value.