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Home >> Ford >> 2005 >> Escape Base, 3.0 1, FWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 35 (Engine Controls - Powertrain DTC Charts And Description - (Hybrid)) >> Diagnostic Trouble Code (DTC) Charts and Descriptions >> DTC P1237: Fuel Pump Secondary Circuit Malfunction

DTC P1237: Fuel Pump Secondary Circuit Malfunction

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P1237 - FUEL PUMP SECONDARY CIRCUIT MALFUNCTION

Description:  Indicates the FPDM has detected a fuel pump secondary circuit fault. The FPDM sends a message to the PCM through the FPM circuit, indicating this failure has been detected. The PCM sets the DTC when the message is received.
Possible Causes: 
  • Open or shorted FP PWR circuit.
  • Open FP RTN circuit to FPDM.
  • Open or shorted circuit in the fuel pump.
  • Locked fuel pump rotor.
  • Damaged FPDM.
Diagnostic Aids:  The FPDM sends a 75% duty cycle (750 ms ON, 250 ms OFF) through the FPM circuit to the PCM while the fault is being detected by the FPDM. If the fault is no longer detected, the PCM returns to sending an all OK (50% duty cycle) message to the PCM.
The FPDM controls pump speed by supplying a variable ground on the FP RTN circuit.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
All GO to Pinpoint Test KB .
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