Fuel Pump Driver Module (FPDM)

Courtesy of JAGUAR CARS, INC.

The fuel pump driver module is located in the rear left-hand (LH) quarter, adjacent to the parking aid control module.

The fuel pump is controlled by the engine control module (ECM). The engine control module (ECM) sends a pulse width modulation (PWM) signal to the fuel pump driver module from pin B20 of the engine control module (ECM), the frequency of the signal determines the duty cycle of the pump. The pulse width modulation (PWM) signal to the pump represents half the ON time of the pump. If the engine control module (ECM) transmits a 50% on time, the fuel pump driver module drives the pump at 100%. If the engine control module (ECM) transmits a 5% ON time, the fuel pump driver module drives the pump at 10%. The fuel pump driver module will only turn the fuel pump ON if it receives a valid signal between 4% and 50%. When The engine control module (ECM) requires the fuel pump to be turned OFF, the engine control module (ECM) transmits a duty cycle signal of 75%.

The status of the fuel pump driver module is monitored by the engine control module (ECM) on pin B21. Any errors can be retrieved from the engine control module (ECM). The fuel pump driver module cannot be interrogated for diagnostic purposes.

The manifold absolute pressure (MAP) sensor controls the fuel pump driver module in response to inputs from the fuel rail pressure sensor, the manifold absolute pressure (MAP) sensor and the mass air flow (MAF)/intake air temperature (IAT) sensor.