Fuel Temperature (FT) sensor (Engine management system - Td5)

Fuel Temperature (FT) sensor

The FT sensor is located at the rear of the engine in the fuel rail with the tip of the sensor inserted at least 10 mm into the fuel flow. This allows the sensor to respond correctly to changes in fuel density in relation to fuel temperature.

The FT sensor works as a NTC sensor. As fuel temperature rises the resistance in the sensor decreases. As temperature decreases the resistance in the sensor increases. The ECM is able to compare the voltage signal to stored values and compensates fuel delivery as necessary for hot engine start.

The operating range of the sensor is -40 to 130 °C (-40 to 266 °F).

Input/Output The inputs and outputs for the FT sensor are 5 volt supply and signal out. In the event of component failure the ECM reverts to a fixed value of 60 °C stored in its memory.

The output signal is measured via pin 19 of the ECM connector C0158. The earth path is via pin 5 of ECM connector C0158.

FT sensor temperature to resistance table.