Envoy 2WD V8-5.3L VIN P (2004)
Accelerator Pedal Position Sensor: Description and Operation
ACCELERATOR PEDAL POSITION (APP) SENSOR
The accelerator pedal assembly contains 2 individual APP sensors within the assembly. The accelerator pedal position (APP) sensors 1 and 2
potentiometer type sensors each with 3 circuits:
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A 5-volt reference circuit
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A low reference circuit
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A signal circuit
The APP sensors are used to determine the pedal angle. The control module provides each APP sensor a 5-volt reference circuit and a low reference
circuit. The APP sensors then provide the control module with signal voltage proportional to pedal movement. Both APP sensor signal voltages are low
at rest position and increase as the pedal is applied.
