Throttle Position Sensor: Description and Operation

The Throttle Sensor is a potentiometer attached to the throttle body and splined to the throttle shaft. The potentiometer rotates with the shaft as the throttle opens and closes. Varying potentiometer resistance alters the reference voltage supplied by the ECU, allowing it to read throttle valve opening angle. This input is used in ECU calculations for these outputs:

^ Fuel injection quantity and timing
^ Idle speed control
^ EGR vent and vacuum solenoid valves
^ Pressure regulator solenoid valve
^ Purge control
^ Ignition timing control