Accelerator Pedal Position (APP) Sensor

The APP sensor is mounted on the accelerator pedal control assembly. The sensor is made up of 2 individual sensors within one housing. Two separate signal, low reference, and 5-volt reference circuits are used in order to interface the accelerator pedal sensor assembly with the engine control module (ECM). Each sensor has a unique functionality to determine pedal position. The ECM uses the APP sensor to determine the amount of acceleration or deceleration desired by the person driving the vehicle. The APP sensor 1 voltage should increase as the accelerator pedal is depressed, from below 0.7 volts at 0 percent pedal travel to 4.5 volts at 100 percent pedal travel. APP sensor 2 voltage should increase from above 0.3 volts at 0 percent pedal travel to 2.2 volts at 100 percent pedal travel.