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Home >> Infiniti >> 2017 >> QX60 Base, FWD >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System (DTCS) (Except Hybrid) (4 Of 4) >> DTC/Circuit Diagnosis >> DTC P1220: Fuel Pump Control Module (FPCM) >> Diagnosis Procedure >> Diagnostic Test
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Diagnostic Test

  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 STEP 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
      DTC B50 6 Ground Battery: voltage

    Is the inspection result normal?

    YES 

    GO TO STEP 4  .

    NO 

    GO TO STEP 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
      DTC 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
      DTC B50 3 Ground Existed
    3. Also: check harness for short to power.

    Is the inspection result normal?

    YES 

    GO TO STEP 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
      DTC 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 STEP 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
      DTC 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 STEP 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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