Throttle Position Sensor (TPS)

The TPS is an electric variable resistor which is regulated by the movement of the throttle shaft. It is mounted on the throttle body and senses the angle of throttle blade opening.

A voltage signal of up to 5 Volts at wide open throttle is produced by the sensor. Voltage varies with throttle angle changes. This signal is transmitted to the ECU where it is used to adjust air/fuel ratio during acceleration, deceleration, idle, and wide open throttle conditions.

A dual TPS is used on models with automatic transmissions. This dual TPS not only provides the ECU with input voltages but also supplies the automatic transmission with input signals relative to throttle position.