Throttle Position Sensor

Control unit supplies throttle position sensor with a 5-volt reference signal. Sensor contains both a potentiometer (variable resistor) and an idle switch. Throttle position sensor sends control unit a potentiometer output signal corresponding to opening of throttle valve and an idle switch signal that turns on only when throttle is in idle position. Control unit uses these signals to control air/fuel ratio during acceleration, deceleration and idling. Signals are also used to help determine control of idle speed control solenoid.