Five Hundred AWD V6-3.0L VIN 1 (2005)
Fuel Temperature Sensor: Description and Operation
Fuel Rail Temperature (FRT) Sensor
FUEL RAIL TEMPERATURE (FRT) SENSOR
Fuel Rail Temperature (FRT) Sensor
The FRT sensor is a thermistor device in which resistance changes with temperature. The electrical resistance of a thermistor decreases as the
temperature increases, and the resistance increases as the temperature decreases. The varying resistance affects the voltage drop across the sensor
terminals and provides electrical signals to the PCM corresponding to temperature.
Thermistor-type sensors are considered passive sensors. A passive sensor is connected to a voltage divider network so that varying the resistance of the
passive sensor causes a variation in total current flow.
Voltage that is dropped across a fixed resistor in series with the sensor resistor determines the voltage signal at the PCM. This voltage signal is equal to
the reference voltage minus the voltage drop across the fixed resistor.
The FRT sensor measures the temperature of the fuel near the fuel injectors. This signal is used by the PCM to adjust the fuel injector pulse width and
meter fuel to each engine combustion cylinder.
