Fuel Pump Monitor (FPM) - ERFS

WARNING: This page does not describe the selected car, but rather 32 other vehicles, including the 2011 Mercury Milan, 2011 Mercury Mariner, 2011 Mercury Grand Marquis, 2011 Lincoln Town Car, and 2011 Lincoln Navigator L. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: The Mustang 5.4L uses 2 fuel pump control modules to control fuel for the fuel delivery system. The PCM individually monitors both fuel pump control modules through the FPM and FPM2 circuits.

The FPDM or fuel pump control module communicates diagnostic information to the PCM through the FPM circuit. This information is sent by the FPDM or fuel pump control module as a duty cycle signal. The 3 duty cycle signals that may be sent are listed in the following table.

FUEL PUMP CONTROL MODULE DUTY CYCLE SIGNALS (MUSTANG 5.4L)

FUEL PUMP CONTROL MODULE DUTY CYCLE SIGNALS REFERENCE CHART

Duty Cycle	Comments
20%	This duty cycle indicates the fuel pump control module is receiving an invalid duty cycle from the PCM.
40%	This duty cycle indicates the fuel pump control module is receiving an invalid event notification signal from the RCM.
60%	This duty cycle indicates the fuel pump control module is functioning normally.
80%	This duty cycle indicates the fuel pump control module is detecting a concern with the secondary circuits.

FUEL PUMP DRIVER MODULE DUTY CYCLE SIGNALS (ALL OTHERS)

FUEL PUMP DRIVER MODULE DUTY CYCLE SIGNALS REFERENCE CHART

Duty Cycle

Comments

FP_M PID⁽¹⁾

50%

This duty cycle indicates that the FPDM is functioning normally.

80-125%

25%

This duty cycle indicates that the FPDM either did not receive a fuel pump (FP) duty cycle command from the PCM or did not receive a valid FP duty cycle command from the PCM.

15-60%

75%

This duty cycle indicates that the FPDM detects a concern in the circuits between the fuel pump and FPDM.

250-400%

⁽¹⁾	Some scan tools display the FP_M PID as the duty cycle in column 1. Other scan tools display the FP_M PID as a value shown in the FP_M PID column. This value fluctuates randomly. It is OK for the value to briefly go outside this range, then return.

For additional information, refer to POWERTRAIN CONTROL HARDWARE , Fuel Pump Driver Module (FPDM) or Fuel Pump Control Module .