C 3500 HD Truck 2WD V8-8.1L VIN G (2002)
Electronic Throttle Actuator: Description and Operation
Accelerator Pedal Position (APP) Sensor
Accelerator Pedal Position (APP) Sensor
The APP sensor is mounted on the accelerator pedal assembly. The APP is actually 3 individual APP sensors within one housing. Three separate signal,
low reference, and 5-volt reference circuits are used to connect the APP and the TAC module. The APP sensor 1 voltage should increase as the
accelerator pedal is depressed, from below 1 volt at 0 percent pedal travel to above 2 volts at 100 percent pedal travel. APP sensor 2 voltage should
decrease from above 4.0 volts at 0 percent pedal travel to below 2.9 volts at 100 percent pedal travel. APP sensor 3 voltage should decrease from
above 3.8 volts at 0 percent pedal travel to below 3.1 volts at 100 percent pedal travel.
