Throttle Position Sensor (A/T)

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