System Operation: Operation

WARNING: This page is about a different car, the 2015 Jaguar XF, 2014 Jaguar XF, and 2013 Jaguar XF. However, it is still accessible from the selected car via links, so may be relevant.

The 2.0L GTDi fuel system uses a returnless fuel system. The fuel pump operation is regulated by the FPDM (fuel pump driver module), which is controlled by the ECM (engine control module). The FPDM regulates the fuel flow and pressure delivered to the engine mounted High Pressure (HP) fuel pump by controlling the operation of the fuel pump using PWM (pulse width modulation) output.

The pump operation is controlled by the ECM which uses signals from the Low Pressure (LP) fuel sensor to regulate the pump operation to maintain the optimum fuel pressure and flow.

Two fuel level sensors are connected to the CJB (central junction box). The CJB monitors the outputs from these sensors to determine the fuel level remaining in the fuel tank and to display the fuel level in the instrument cluster.