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.
1-76 Description and Operation
Fuel Systems
Fuel Pump Duty Cycle Output From PCM (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 1.0L, Focus 2.0L GTDI, Focus 2.3L, 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)
FP Duty Cycle Command | PCM Status | Fuel Pump Control Module Actions |
|---|---|---|
0-5% | Invalid OFF duty cycle. | The fuel pump control module sends a 20% duty cycle signal on the FPM circuit. The fuel pump is OFF. |
5-47% | Normal operation. | The fuel pump control module operates the fuel pump at the speed requested. FP duty cycle times 1.43 minus 14.29 equals pump speed % of full ON. For example, FP duty cycle equals 42%. 42 times 1.43 minus 14.29 equals 46 (rounded). Pump is run at 46% of full ON. The fuel pump control module sends a 60% duty cycle signal on the FPM circuit. |
47-51% | Normal operation — full ON. | The fuel pump control module operates the fuel pump at full ON. The fuel pump control module sends a 60% duty cycle signal on the FPM circuit. |
51-67% | Invalid OFF 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 the FPM circuit. The fuel pump is OFF. |
83-100% | Invalid OFF duty cycle. | The fuel pump control module sends a 20% duty cycle signal on the FPM circuit. The fuel pump is OFF. |
Fuel Pump Duty Cycle Output From PCM (All Others)
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 FPM circuit. The fuel pump is OFF. |
37% | Normal low speed operation. | The fuel pump control module operates the fuel pump at the speed requested. The fuel pump control module sends a 60% duty cycle signal on the FPM circuit. |
47% | Normal high speed operation. | The fuel pump control module operates the fuel pump at the speed requested. The fuel pump control module sends a 60% duty cycle signal on the 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 the 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. |
Fuel Pump Monitor (FPM) — All Others
NOTE: The Focus 2.3L 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 module communicates diagnostic information to the PCM through the FPM circuit. This information is sent by the fuel pump control module as a duty cycle signal. The duty cycle signals that may be sent are listed in the following tables.
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.