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Home >> Ford >> 2009 >> Flex Limited, FWD >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Controls - Powertrain DTC Charts & Descriptions (Except Diesel & Hybrid) >> DTC Diagnosis >> DTC P0231: - Fuel Pump Secondary Circuit Low

DTC P0231: - Fuel Pump Secondary Circuit Low

DTC 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 
All GO to Pinpoint Test KA .
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