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 outputs such as fuel injection quantity, pressure regulator solenoid valve control and A/C cut-off.

^ ECU reference voltage is approximately 0.5V at idle and 4.3V at wide open throttle.