Throttle Position Sensor: Description and Operation

Throttle Body And TPS:

PURPOSE
The throttle position sensor detects throttle angle and idle position of the throttle plate. A sub-throttle position sensor is used for traction control. Both sensors will set a diagnostic trouble code (DTC) if a malfunction occurs.

LOCATION
The sensors are mounted on the throttle body.

CONSTRUCTION
Each sensor contains a potentiometer and an idle switch.

OPERATION
Whenever the throttle is opened, a varied resistance signal is reported to the ECU. When the throttle is returned to the idle position, the idle switch portion of the sensor is closed.