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Home >> Infiniti >> 2018 >> QX60 AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (DTC/Circuit Diagnosis) (1 Of 6) >> DTC/Circuit Diagnosis >> Power Supply And Ground Circuit >> Fuel Pump Control Module (FPCM) >> Diagnosis Procedure
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Diagnosis Procedure

  1. CHECK FUSE 
    1. Turn ignition Switch OFF.
    2. Check that the following fuse is not blowing.

      Location

      Fuse No.

      Capacity

      IPDM E/R

      #47

      15 A

    Is the fuse blown (open)?

    YES

    Replace the fuse after repairing the applicable circuit.

    NO

    GO TO 2.

  2. CHECK GROUND CONNECTION 

    Check ground connection B19. Refer to Ground Inspection in Circuit Inspection .

    Is the inspection result normal?

    YES

    GO TO 3.

    NO

    Repair or replace ground connection.

  3. CHECK FPCM GROUND CIRCUIT FOR OPEN AND SHORT 
    1. Disconnect FPCM harness connectors.
    2. Check the continuity between FPCM harness connector and ground.

      FPCM

      --

      Continuity

      Connector

      Terminal

      B50

      3

      Ground

      Existed
    3. Also check harness for short to power.

    Is the inspection result normal?

    YES

    GO TO 4.

    NO

    Repair or replace error-detected parts.

  4. CHECK FPCM POWER SUPPLY 
    1. Turn ignition Switch ON.
    2. Check the voltage between FPCM harness connector terminals.

      FPCM

      Voltage

      Connector

      +

      -

      Terminal

      B50

      6

      3

      Battery voltage

    Is the inspection result normal?

    YES

    Check intermittent incident. Refer to Intermittent Incident .

    NO

    GO TO 5.

  5. CHECK FPCM POWER SUPPLY CIRCUIT 
    1. Turn ignition Switch OFF.
    2. Disconnect FPCM harness connectors.
    3. Disconnect IPDM E/R harness connectors.
    4. Check the continuity between IPDM E/R harness connector and FPCM harness connector.

      IPDM E/R

      FPCM

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      E121

      15

      B50

      6

      Existed
    5. Also check harness for short to power and short to ground.

    Is the inspection result normal?

    YES

    GO TO 6.

    NO

    Repair or replace error-detected parts.

  6. CHECK FUEL PUMP RELAY SIGNAL 
    1. Reconnect IPDM E/R harness connectors.
    2. Turn ignition Switch ON.
    3. Check the voltage between ECM harness connectors.

      ECM

      Voltage

      +

      -

      Connector

      Terminal

      Connector

      Terminal

      F79

      124

      E32

      204

      0 - 1.0 V

    Is the inspection result normal?

    YES

    GO TO 8.

    NO

    GO TO 7.

  7. CHECK FUEL PUMP RELAY SIGNAL CIRCUIT 
    1. Turn ignition Switch OFF.
    2. Disconnect ECM harness connectors.
    3. Disconnect IPDM E/R harness connectors.
    4. Check the continuity between IPDM E/R harness connector and ECM harness connector.

      IPDM E/R

      ECM

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      F24

      69

      F79

      124

      Existed
    5. Also check harness for short to power and short to ground.

    Is the inspection result normal?

    YES

    GO TO 8.

    NO

    Repair or replace error-detected parts.

  8. CHECK POWER SUPPLY CIRCUIT 

    Perform trouble diagnosis for power supply circuit.

    Is the inspection result normal?

    YES

    Replace IPDM E/R. Refer to Removal and Installation .

    NO

    Repair or replace error-detected parts.

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