Fuel temperature sensor

Fuel temperature sensor

The fuel temperature sensor is inserted in the fuel rail and measures fuel rail temperatures. During engine cranking at high temperatures, the ECM opens the idle air control valve to aid hot starting.

Throttle position sensor

The throttle position sensor is a potentiometer (variable resistor) mounted in on the side of the throttle housing and is directly coupled to the throttle disc shaft.

Three wires connect the throttle potentiometer to the ECM; a 5 volt supply to the potentiometer, an earth return to the ECM and an output voltage to the ECM which indicates the rate of throttle disc movement and position.