DTC P1235: Fuel Pump Control Out Of Range
WARNING: This page does not describe the selected car, but rather 30 other vehicles, including the 2006 Mercury Mountaineer, 2006 Mercury Monterey, 2006 Mercury Montego, 2006 Mercury Mariner, and 2006 Mercury Grand Marquis. However, it is still accessible from the selected car via links, so may be relevant.
P1235 - FUEL PUMP CONTROL OUT OF RANGE
| Description: | Note: For the LS, the FPDM functions are incorporated in the rear electronics module (REM). Also, the REM does not use an FPM circuit. Diagnostic information is sent on the communication link. This DTC indicates the fuel pump driver module (FPDM) detected an invalid or missing fuel pump (FP) command signal from the powertrain control module (PCM). The FPDM sends a message to the PCM through the fuel pump monitor (FPM) circuit, indicating this concern was detected. The PCM sets the DTC when the message is received. |
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| Possible Causes: |
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| Diagnostic Aids: | The FPDM sends a 25% duty cycle (250 ms on, 750 ms off) through the FPM circuit to the PCM while the concern is being detected by the FPDM. If the concern is no longer detected, the FPDM returns to sending an all OK (50% duty cycle) message to the PCM. For ETC applications, check if ETC DTC P2105 is present. An ETC system concern could cause P1235, and should be diagnosed first. |
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| Application | Key On Engine Off | Key On Engine Running | Continuous Memory |
| All | GO to Pinpoint Test KB . | ||