Throttle Position Sensor: Description and Operation

THROTTLE POSITION (TP) SENSOR




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 0.35 (±0.2) volts at 0% throttle plate opening to 4.65 volts at wide open throttle.

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