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Home >> Ford >> 2005 >> Escape Hybrid, FWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 5 (Engine Controls - Powertrain DTC Charts & Description (Except Diesel & Hybrid)) >> Diagnostic Trouble Code (DTC) Charts And Descriptions >> DTC P0231: Fuel Pump Secondary Circuit Low

DTC P0231: Fuel Pump Secondary Circuit Low

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P0231 - FUEL PUMP SECONDARY CIRCUIT LOW

Description:  The powertrain control module (PCM) monitors the fuel pump monitor (FPM) circuit. The test fails if the PCM commands the fuel pump ON and B+ voltage is not detected on the FPM circuit.
Possible Causes: 
  • Open B+ circuit to the fuel pump relay
  • Open FP PWR circuit between the fuel pump relay and its connection to the FPM circuit
  • Damaged fuel pump relay
Diagnostic Aids:  During the key on engine off (KOEO) self-test, the PCM commands the fuel pump on so this test can be carried out.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
Excursion GO to KA: Fuel Pump (FP) Relay STEP KA56. GO to KA: Fuel Pump (FP) Relay STEP KA56. GO to KA: Fuel Pump (FP) Relay STEP KA61.
All others GO to KA: Fuel Pump (FP) Relay STEP KA22. GO to KA: Fuel Pump (FP) Relay STEP KA22. GO to KA: Fuel Pump (FP) Relay STEP KA29.
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