Throttle Position Sensor: Description and Operation

Throttle Position (TPS) Sensor Circuit:

The Throttle Position Sensor (TPS), located on the throttle chamber at the throttle shaft, is a rotating type variable resistor. It senses the throttle valve angle. As the throttle shaft rotates, the output Voltage of the TPS changes. The ECU determines the throttle valve opening based on the output Voltage. The ECU computes throttle valve opening change (output Voltage change) and judges the engine acceleration state and accordingly corrects fuel injection amount during acceleration.