Throttle Position Sensor (Except Metro M/T & Prizm)

ECM supplies throttle position sensor with a 5-volt reference signal. Throttle position sensor contains a variable resistor and idle switch. Throttle position sensor sends an output signal to ECM 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. On Metro A/T models, the ECM converts the signal to a on/off signal and sends it to the A/T module for controlling the transmission.