Fuel Pump Driver Module (FPDM) Applications (and Applications with Fuel Pump Functions Incorporated in Rear Electronic Module)

WARNING: This page does not describe the selected car, but rather 32 other vehicles, including the 2005 Mercury Sable, 2005 Mercury Mountaineer, 2005 Mercury Monterey, 2005 Mercury Montego, and 2005 Mercury Mariner. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: For the Thunderbird and LS, the FPDM functions are incorporated in the rear electronic module (REM). The fuel pump operation is the same as in applications using the stand-alone FPDM. However, the REM will transmit diagnostic information over the communications network instead of using a fuel pump monitor (FPM) circuit.

NOTE: The Ford GT uses 2 FPDMs to control fuel for the dual-injection fuel delivery system. The PCM will send one FP duty cycle which is used by both pumps.

The fuel pump (FP) signal is a duty cycle command sent from the PCM to the FPDM (FUEL PUMP DUTY CYCLE OUTPUT FROM PCM ). The FPDM uses the FP command to operate the fuel pump at the speed requested by the PCM or to turn the pump off.

FUEL PUMP DUTY CYCLE OUTPUT FROM PCM

FP Duty Cycle Command	PCM Status	FPDM Actions
0-5%	PCM will not output this duty cycle.	Invalid FP duty cycle. FPDM sends 25% duty cycle signal on the fuel pump monitor (FPM) circuit. The fuel pump is off.
5-51%	Normal operation.	FPDM operates the fuel pump at the speed requested. "FP duty cycle" x 2 = pump speed % of full on. (for example, FP duty cycle = 42%. 42x2=84. Pump is run at 84% of full on). FPDM sends 50% duty cycle signal on FPM circuit.
51-69%	PCM will not output this duty cycle.	Invalid FP duty cycle. FPDM sends 25% duty cycle signal on the fuel pump monitor (FPM) circuit. The fuel pump is off.
70-81%	To request the fuel pump off, the PCM will output a 75% duty cycle.	Valid fuel pump off command from the PCM. FPDM will not operate the fuel pump. FPDM sends a 50% duty cycle signal on the FPM circuit.
82-100%	PCM will not output this duty cycle.	Invalid FP duty cycle. FPDM sends 25% duty cycle signal on the FPM circuit. The fuel pump is off.

NOTE: Also refer to FUEL PUMP MONITOR (FPM) and FUEL PUMP DRIVER MODULE (FPDM) .