Vehicle applicability: This diagnostic supplement covers multiple Ford vehicles and engines. Follow the application named in the source below. Some references apply to vehicles other than Mustang.
1-72 Description and Operation
Fuel Systems
Item | Part Number | Description |
|---|---|---|
3 | — | Fuel Pump Control Module 1 And Fuel Pump Control Module 2 |
4 | — | FP Assembly 1 And FP Assembly 2 |
5 | — | Fuel Filter |
6 | — | Fuel Rail And Injectors |
7 | — | FRPT Sensor |
8 | — | Diagnostic |
9 | — | Pulse Width Modulation |
10 | — | Power Source |
11 | — | FP relay command |
Fuel Pump Control — ERFS
NOTE: The Mustang 5.2L uses 2 fuel pump control modules to control fuel for the fuel delivery system. The PCM sends one FP duty cycle on the FPC circuit. Both fuel pump control modules use this circuit.
The FP signal is a duty cycle command sent from the PCM to the fuel pump control modules. The fuel pump control modules use the FP command to operate the fuel pumps at the speed requested by the PCM or to turn the pumps OFF. When the ignition is turned ON, the electric fuel pumps run for about 1 second and are requested OFF by the PCM if engine rotation is not detected.
Fuel Pump Duty Cycle Output From PCM
FP Duty Cycle Command | PCM Status | Fuel Pump Control Module Actions |
|---|---|---|
0-15% | Invalid OFF duty cycle. | The fuel pump control module sends a 20% duty cycle signal on the fuel pump monitor (FPM) circuit. The fuel pump is OFF. |
5-51% | Normal operation. | The fuel pump control module operates the fuel pump at the speed requested. FP duty cycle times 2 equals pump speed % of full ON. For example, FP duty cycle equals 42%. 42 times 2 equals 84. Pump is run at 84% of full ON. The fuel pump control module sends a 60% duty cycle signal on FPM circuit. |
51-67% | Invalid ON duty cycle. | The fuel pump control module sends a 20% duty cycle signal on the FPM circuit. The fuel pump is OFF. |
67-83% | Valid OFF duty cycle. | The fuel pump control module sends a 60% duty cycle signal on FPM circuit. The fuel pump is OFF. |
83-100% | Invalid ON duty cycle. | The fuel pump control module sends a 20% duty cycle signal on the FPM circuit. The fuel pump is OFF. |
For additional information, refer to Powertrain Control Hardware, Fuel Pump Control Module.
Fuel Pump Monitor (FPM) — ERFS
NOTE: The Mustang 5.2L 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 fuel pump control modules communicate diagnostic information to the PCM through the FPM and FPM2 circuits. This information is sent by the fuel pump control modules as a duty cycle signal. The 3 duty cycle signals that may be sent are listed in the following table.
2016 Powertrain Control/Emissions Diagnosis, Gasoline Engines, 3/2015
2016 Mustang workshop publication supplied to Mustang Atlas. Original technical text and illustrations; HTML formatting by Mustang Atlas. Source page numbering is retained for traceability. Follow the configuration, revision, warnings, and cross-references in the material. About this edition.