Throttle Position Sensor: Description and Operation

Throttle Position Sensor:

PURPOSE
Provide PCME with throttle valve opening angle signal.

LOCATION
Side of throttle body.

OPERATION
Sensor is a potentiometer rotated by the throttle shaft as it opens and closes. Varying potentiometer resistance alters reference voltage supplied by the PCME, allowing it to read throttle valve opening angle. PCME reference voltage is below 0.1 - 1.0V with throttle fully closed and 3.1 - 4.5V at wide open throttle. Sensor contains an idle switch to signal PCME when throttle is fully closed.