Throttle Position Sensor

ECM 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 ECM a potentiometer output signal corresponding to throttle valve opening and idle switch signal that turns on only when throttle is in idle position. ECM uses these signals to help determine control of air/fuel ratio during acceleration, deceleration and idle.