Throttle Position Sensor (TPS) & Idle Switch

The throttle position sensor incorporates a potentiometer which varies output voltage in response to changing throttle positions. This information is relayed to the ECU in the form of input voltage signals. The TPS also has the ability to inform the ECU of the rate of speed that changes are taking place in throttle plate movement. It is attached to throttle body housing and is actuated with movement of the accelerator pedal. The idle switch, which is an integral part of the throttle position sensor, is closed at idle and open during all other conditions, this informs the ECU when the vehicle is at idle.