Accelerator Pedal Position (APP) Sensor

The accelerator pedal contains two individual accelerator pedal position (APP) sensors within the assembly. The APP sensors one and two are potentiometer type sensors each with three circuits:

• A 5-volt reference circuit
• A low reference circuit
• A signal circuit

The APP sensors are used to determine the pedal angle. The engine control module (ECM) provides each APP sensor a 5-volt reference circuit and a low reference circuit. The APP sensors provide the ECM with signal voltage proportional to the pedal movement. The APP sensor 1 signal voltage at rest position is less than 1 volt and increases as the pedal is actuated. The APP sensor 2 signal voltage at rest position above 4 volts and decreases as the pedal is actuated.