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Home >> Infiniti >> 2019 >> QX60 Pure, AWD >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Control System (DTC/Circuit Diagnosis) (11 Of 17) >> DTC/Circuit Diagnosis >> DTC P1220: 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

      15A

    Is the fuse blown (open)?

    YES

    Replace the fuse after repairing the applicable circuit.

    NO

    GO TO 2.

  2. CHECK FPCM POWER SUPPLY 
    1. Turn ignition switch OFF.
    2. Disconnect FPCM harness connector.
    3. Turn ignition switch ON.
    4. Check the voltage between FPCM harness connector and ground.

      +

      -

      Voltage

      FPCM

      Connector

      Terminal

      B50

      6

      Ground

      Battery voltage

    Is the inspection result normal?

    YES

    GO TO 4.

    NO

    GO TO 3.

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

      FPCM

      IPDM E/R

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      B50

      6

      E121

      15

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

    Is the inspection result normal?

    YES

    Perform trouble diagnosis for power supply circuit.

    NO

    Repair or replace error-detected parts.

  4. CHECK FPCM GROUND CIRCUIT 
    1. Turn ignition switch OFF.
    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 5.

    NO

    Repair or replace error-detected parts.

  5. CHECK FPCM INPUT AND OUTPUT CIRCUIT 
    1. Disconnect ECM harness connector.
    2. Check the continuity between FPCM harness connector and ECM harness connector.

      FPCM

      ECM

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      B50

      4

      E32

      182

      Existed

      5

      188
    3. 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 CONTROL CIRCUIT 
    1. Disconnect "fuel level sensor unit and fuel pump (main)" harness connector.
    2. Check the continuity between FPCM harness connector and "fuel level sensor unit and fuel pump (main)" harness connector.

      FPCM

      Fuel level sensor unit and fuel pump (main)

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      B50

      1

      B72

      6

      Existed

      2

      4
    3. Also check harness for short to power and short to ground.

    Is the inspection result normal?

    YES

    GO TO 7.

    NO

    Repair or replace error-detected parts.

  7. CHECK FPCM 

    Refer to Component Inspection (FPCM) .

    Is the inspection result normal?

    YES

    INSPECTION END

    NO

    Replace FPCM. Refer to Removal and Installation .

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