Fuel Pump Driver Module (FPDM)
NOTE:
The Mustang 5.4L uses 2 FPDMs to control fuel for the fuel delivery system. The PCM outputs only one fuel pump duty cycle on the fuel pump control (FPC) circuit. This circuit is used by both FPDMs. The PCM individually monitors the FPDMs through the FPM and FPM2 circuits. The FPDM located on the driver side of the luggage compartment is referred to as FPDM and the FPDM located on the passenger side of the luggage compartment, is referred to as FPDM2.
The FPDM receives a duty cycle signal from the PCM and controls the fuel pump operation in relation to this duty cycle. This results in variable speed fuel pump operation. The FPDM controls the fuel pump by switching the fuel pump return circuit on and off at the required duty cycle. The FPDM sends diagnostic information to the PCM on the FPM circuit. For additional information on the fuel pump control and the fuel pump monitor, refer to FUEL SYSTEMS .