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Home >> Chevrolet >> 1998 >> Corvette V8-5.7L VIN G >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Accelerator Pedal Position Sensor >> Description and Operation
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Accelerator Pedal Position Sensor: Description and Operation






DESCRIPTION
The Accelerator Pedal Position (APP) sensor is mounted on the accelerator pedal assembly. The sensor is actually three individual Accelerator Pedal Position sensors within one housing. Three separate signal ground and 5 volt reference circuits are used to connect the Accelerator Pedal Position Sensor assembly and the Throttle Actuator Control (TAC) Module. Each sensor has a unique functionality.

OPERATION
The APP sensor 1 signal increases as the accelerator pedal is depressed, from below 1 volt at 0% pedal travel (pedal at rest) to above 3.3 volts at 100% pedal travel (pedal fully depressed). The APP sensor 2 signal decreases from above 4 volts at 0% pedal travel to below 1.8 volts at 100% pedal travel. The APP sensor 3 signal also decreases from above 3.5 volts at 0% pedal travel to below 2.6 volts at 100% pedal travel. Note also that the signal circuits for APP Sensor 2 and APP Sensor 3 are pulled up to 5 volts and the APP Sensor 1 signal circuit is pulled to ground within the TAC Module.

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