DTC P025B: - Fuel Pump Module Control Circuit Range/Performance
WARNING: This page does not describe the selected car, but rather 32 other vehicles, including the 2009 Mercury Mountaineer, 2009 Mercury Milan, 2009 Mercury Mariner, 2009 Mercury Grand Marquis, and 2009 Lincoln Town Car. However, it is still accessible from the selected car via links, so may be relevant.
DTC P025B: - FUEL PUMP MODULE CONTROL CIRCUIT RANGE/PERFORMANCE
| Description: | The fuel pump control module monitors the duty cycle and frequency of the signal it receives from the powertrain control module (PCM). The fuel pump control module determines if the signal from the PCM on the fuel pump command (FPC) circuit is a valid duty cycle and frequency. If the duty cycle or frequency is invalid, the fuel pump control module sends a 20% duty cycle signal on the fuel pump monitor (FPM) circuit to report the concern to the PCM. The test fails when the fuel pump control module is still reporting that it is receiving an invalid duty cycle or frequency from the PCM after a calibrated amount of time. | ||
| Possible Causes: |
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| Diagnostic Aids: | Check the harness for routing, alterations, incorrect shielding, or electrical interference from other systems. | ||
| Application | Key On Engine Off | Key On Engine Running | Continuous Memory |
| All | GO to Pinpoint Test KC . | ||