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.
Description and Operation 1-77
Fuel Systems
Fuel Pump Control Module Duty Cycle Signals (Edge 2.0L, Edge 2.7L, Escape 1.6L, Escape 2.0L, Expedition, Explorer 2.3L, Explorer 3.5L GTDI, F-150 2.7L, F-150 3.5L GTDI, Fiesta 1.0L, Fiesta 1.6L GTDI, Focus, Fusion 1.5L, Fusion 2.0L, MKC, MKT 2.0L, MKX 2.0L, MKX 2.7L, MKZ 2.0L, Mustang 2.3L, Navigator, Taurus 2.0L, Transit Connect 1.6L)
Duty Cycle | Comments |
|---|---|
20% | This duty cycle indicates the fuel pump control module is receiving an invalid duty cycle from the PCM. |
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 Control Module Duty Cycle Signals (All Others)
Duty Cycle | Comments |
|---|---|
20% | This duty cycle indicates the fuel pump control module is receiving an invalid duty cycle from the PCM. |
40% | For vehicles with event notification signal, this duty cycle indicates the fuel pump control module is receiving an invalid event notification signal from the RCM. For vehicles without event notification signal, this duty cycle indicates the fuel pump control module is functioning normally. |
60% | For vehicles with event notification signal, 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 Filters
The system contains 3 to 5 filtering or screening devices. Refer to Workshop Manual Section 310-01, Fuel Tank and Lines, for the individual component locations.
1. The fuel intake filter or screen is a fine nylon mesh filter mounted on the intake side of the fuel pump. It is part of the assembly and cannot be repaired separately.
2. The filter/screen at the fuel rail port of the injectors is part of the fuel injector assembly and cannot be repaired separately.
3. The filter/screen at fuel inlet side of the fuel pressure regulator is part of the regulator assembly and cannot be repaired separately.
4. The fuel filter assembly is located between the fuel pump and injectors. This filter may be a lifetime fuel filter located in the fuel pump assembly or an external 3-port inline filter that allows clean fuel to return to the fuel tank. A new filter may be installed for the external filter.
5. The fuel filter sock is located on the fuel pump assembly between the reservoir and the fuel tank.
Fuel Pressure Sensor
On some gasoline direct fuel injection applications, there is a fuel pressure sensor located in the fuel line that allows the PCM to monitor the low pressure fuel system operation. For additional information, refer to Engine Control Components, Fuel Pressure Sensor in this section.
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.