Throttle Position Sensor: Description and Operation

TPS Circuit:

Purpose
The Throttle Position Sensor (TPS) is a rotating type variable resistor. It senses the throttle valve angle.

Location
The TPS is located on the throttle chamber at the throttle shaft.

Operation
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.