Throttle Full Close Switch: Description and Operation

PURPOSE
The Closed Throttle Position Switch senses whether the accelerator pedal is depressed or not, converts it into high/low voltage and inputs the voltage to the engine control module, which then controls the idle air control motor based on the input signal.

Closed Throttle Position Switch Angle To Voltage Scale:

OPERATION
A voltage is applied to the closed throttle position switch from the engine control module. When the accelerator pedal is released, the closed throttle position switch is turned on to conduct the voltage to ground. This causes the closed throttle position switch terminal voltage to go low from high.