Throttle Position Sensor: Description and Operation

Throttle Body Assembly - VIN 5:

Purpose:
The Throttle Position Sensor (TPS) detects the throttle valve opening.

Operation:
The Throttle Position Sensor (TPS) consists of a contact point (idle switch) and a potentiometer. The throttle opening in the idle state is detected by means of the idle switch which supplies B+ to the ECM when the throttle is moved off idle. The full opening is detected by the potentiometer. A 5-volt reference voltage is applied to the sensor from the ECM and the resistance varies according to the throttle valve opening, the output voltage varies accordingly. By monitoring the sensor output voltage, the ECM detects the throttle valve opening and its change.

Location:
The TPS is mounted to the throttle valve shaft on the throttle body.