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Home >> Saturn >> 2005 >> Ion Red Line >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Introduction >> Description and Operation >> Throttle Actuator Control (TAC) System Description >> Accelerator Pedal Position (APP) Sensor

Accelerator Pedal Position (APP) Sensor

The accelerator pedal contains 2 individual accelerator pedal position (APP) sensors within the assembly. The APP sensors 1 and 2 are potentiometer type sensors each with 3 circuits:

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

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