Throttle Position Sensor (TPS)

The TPS is mounted on side of the throttle body and is connected to the throttle shaft. As throttle valve angle changes, the resistance of the sensor also changes. The ECM supplies a 5-volt reference signal to the TPS. A closed throttle condition produces high resistance at the sensor and the output signal to the ECM will be low (about .5 volt). A wide open throttle condition produces low resistance at the sensor. The output signal to the ECM will be high (about 5 volts).