Throttle Position Sensor: Description and Operation

Throttle Position Sensor:

Location
The TPS is mounted on the throttle shaft.

Purpose
The Throttle Position Sensor (TPS), senses the throttle valve angle.

Operation
The Throttle Position Sensor (TPS) is a rotating type variable resistor

As the throttle shaft rotates, the output voltage of the TPS changes. The ECM determines the throttle valve opening based on TPS output voltage.

The ECM judges the engine acceleration demand and accordingly adjusts fuel injection.