Throttle Position Sensor: Description and Operation

The TP sensor is located on the throttle body connected to the throttle plate shaft. The TP sensor is a potentiometer that varies resistance according to changes in throttle plate position. The PCM measures the signal voltage from the TP sensor, which is a reduced value of the PCM 5 volt reference. The voltage ranges from 0.4 (+/-0.2) volts at 0% throttle position to 4.7 volts at wide open throttle.

The TP sensor is used for:
^ Clear flood mode
^ Cruise control operation.
^ Deceleration enleanment
^ IAC valve opening for throttle following
^ Idle determination
^ Transaxle shifting/TCC operation
^ Wide open throttle conditions