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Home >> Jaguar >> 2020 >> XF Checkered Flag >> Repair and Diagnosis >> External Pages >> Different car >> Section 38 (Electronic Engine Controls - INGENIUM I4 2.0L Diesel -- XE (X760)) >> Electronic Engine Controls - INGENIUM I4 2.0L Diesel >> Description And Operation >> Description >> Fuel Temperature Sensor And Fuel Metering Valve >> Fuel Temperature Sensor

Fuel Temperature Sensor

WARNING: This page is about a different car, the 2018 Jaguar XE and 2017 Jaguar XE. However, it is still accessible from the selected car via links, so may be relevant.

The fuel temperature sensor is located in a threaded port in the HP fuel pump.

The sensor is a NTC sensor which is connected to the PCM by two wires. The PCM fuel temperature sensor circuit consists of an internal voltage divider circuit which incorporates a NTC thermistor. As the fuel temperature raises the resistance through the sensor decreases. The output from the sensor is the change in voltage as the thermistor allows more current to pass to ground relative to the temperature of the fuel.

The PCM monitors the fuel temperature constantly. If the fuel temperature exceeds 85 °C (185 °F) the PCM invokes an engine 'derate' strategy. This reduces the amount of fuel delivered to the injectors in order to allow the fuel to cool. When this occurs, the driver may notice a loss of performance.

The wires to the fuel temperature sensor are monitored by the PCM for short and open circuit. The PCM also monitors the 5 V supply. If a failure occurs a fault is recorded in the PCM memory and the PCM uses a default fuel pressure value.

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