Fuel Pump Monitor (FPM) - ERFS

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 (EDGE 2.0L, EXPLORER 2.0L, FOCUS AND MUSTANG 5.4L)

Duty Cycle	Comments
20%	This duty cycle indicates the fuel pump control module is receiving an invalid duty cycle from the PCM.
40%	For Mustang 5.4L, this duty cycle indicates the fuel pump control module is receiving an invalid event notification signal from the RCM. For Edge 2.0L, Explorer 2.0L and Focus, this duty cycle is calibrated off.
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)

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 .