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Home >> Infiniti >> 2017 >> QX60 Base, FWD >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System (DTCS) (Except Hybrid) (1 Of 4) >> DTC/Circuit Diagnosis >> Power Supply And Ground Circuit >> 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 GROUND CONNECTION

    Check ground connection B19. Refer to Ground Inspection in CIRCUIT INSPECTION .

    Is the inspection result normal?

    YES 

    GO TO STEP 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 STEP 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 STEP 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 STEP 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 STEP 8  .

    NO 

    GO TO STEP 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 STEP 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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