Throttle Position Sensor

The throttle position sensor is provided along with a potentiometer (variable resistor) and idle switch, which is interlocked with the throttle valve shaft. The sensor sends MPFI control unit a potentiometer output signal corresponding to opening of throttle valve and an idle switch signal that turns on only when the throttle is nearly to idle position. The MPFI control unit uses these signals to precisely control air/fuel ratio during acceleration and deceleration, as well as idling.