Fuel Pump Control - ERFS
WARNING: This page does not describe the selected car, but rather 31 other vehicles, including the 2006 Mercury Mountaineer, 2006 Mercury Monterey, 2006 Mercury Montego, 2006 Mercury Milan, and 2006 Mercury Mariner. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
For the LS, the FPDM functions are incorporated in the rear electronic module (REM). The fuel pump operation is the same as in applications using the stand-alone FPDM. However, the REM transmits diagnostic information over the communications network instead of using a fuel pump monitor (FPM) circuit.
NOTE:
The Ford GT uses 2 FPDMs to control fuel for the dual-injection fuel delivery system. The PCM sends one FP duty cycle which is used by both pumps.
The fuel pump (FP) signal is a duty cycle command sent from the PCM to the FPDM. The FPDM uses the FP command to operate the fuel pump at the speed requested by the PCM or to turn the pump off.
FUEL PUMP DUTY CYCLE OUTPUT FROM PCM
| FP Duty Cycle Command | PCM Status | FPDM Actions |
|---|---|---|
| 0-4% | PCM does not output this duty cycle. | Invalid FP duty cycle. FPDM sends 25% duty cycle signal on the fuel pump monitor (FPM) circuit. The fuel pump is off. |
| 4-5% | Dead band range for transitions between FPDM states. | - |
| 5-45% | Normal operation. | FPDM operates the fuel pump at the speed requested. "FP duty cycle" x 2 equals pump speed % of full on. (for example, FP duty cycle equals 42%. 42x2 equals 84. Pump is run at 84% of full on). FPDM sends 50% duty cycle signal on FPM circuit. |
| 45-48% | Normal operation. An open circuit cannot be detected in this range. | FPDM operates the fuel pump at the speed requested. "FP duty cycle" x 2 = pump speed % of full on. FPDM sends 50% duty cycle signal on FPM circuit. |
| 48-51% | Normal operation. | FPDM operates the fuel pump at full on. FPDM sends 50% duty cycle signal on FPM circuit. |
| 51-52% | Dead band range for transitions between FPDM states. | - |
| 52-68% | PCM does not output this duty cycle. | Invalid FP duty cycle. FPDM sends 25% duty cycle signal on the FPM circuit. The fuel pump is off. |
| 68-70% | Dead band range for transitions between FPDM states. | - |
| 70-81% | To request the fuel pump off, the PCM outputs this duty cycle. | Valid fuel pump off command from the PCM. FPDM does not operate the fuel pump. FPDM sends a 50% duty cycle signal on the FPM circuit. |
| 81-83% | Dead band range for transitions between FPDM states. | - |
| 83-100% | PCM does not output this duty cycle. | Invalid FP duty cycle. FPDM sends 25% duty cycle signal on the FPM circuit. The fuel pump is off. |
For additional information, refer to POWERTRAIN CONTROL HARDWARE , FUEL PUMP DRIVER MODULE (FPDM) .