Throttle Position Sensor: Description and Operation

PURPOSE
The throttle position sensor converts the throttle position opening into a voltage and inputs it to the engine control module, which then controls the fuel injection, based on the input signal.

OPERATION
The 5 V power in the engine control module is supplied to the throttle position sensor. It flows through the resistor in the sensor and is then grounded in the engine control module.

Throttle Position Sensor Angle To Voltage Scale:

As the throttle valve shaft rotates from the idle position to wide open position, the resistance between the variable resistor terminal of the throttle position sensor and the ground terminal increases. As a result, the voltage at the throttle position sensor variable resistance terminal also increases.