Throttle Full Close Switch: Description and Operation

PURPOSE/OPERATION
The closed throttle position switch converts data as to whether the accelerator is depressed or released to high/low voltage and to inputs that voltage as signals to the engine control module. The engine control module, based upon those signals, regulates the idle-speed control motor.
Voltage within the engine control module is applied to the closed throttle position switch. When accelerator is released the closed throttle position switch is switched ON grounding the current. As a result, the closed throttle position switch terminal voltage changes from HIGH to LOW level.