Throttle Position Sensor: Description and Operation

DESCRIPTION
The throttle position sensor responds to the throttle position which, in turn, is determined by accelerator pedal movement. This sensor is a kind of potentiometer which transforms the throttle position into an output voltage, and transmits it to the ECM. The sensor also detects the opening and closing speed of the throttle valve and feeds this information as a voltage signal to the ECM too.
Closed throttle position is determined by the ECM. This positioning system is called the "soft closed throttle position switch" and controls engine operations such as fuel cut.