Fuel Temperature Sensor: Description and Operation
ENGINE CONTROL COMPONENTSFuel Rail Temperature (FRT) Sensor
The FRT sensor is a thermistor device in which resistance changes with temperature and is located at the base of the secondary fuel filter housing. The electrical resistance of the thermistor decreases as the temperature increases, and the resistance increases as the temperature decreases. The varying resistance changes the voltage drop across the sensor terminals and provides electrical feedback signal to the PCM corresponding to temperature. The FRT sensor measures the temperature of the fuel at the secondary fuel filter and provides a feedback signal to the PCM. The PCM uses the FRT sensor input to command the cooling fan, the correct injector timing, the pulse width, and the correct injection control pressure for proper fuel delivery at all speed and load conditions.
Fuel Rail Temperature (FRT) Sensor:
