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Home >> Nissan-Datsun >> 2021 >> NV2500 HD S >> Repair and Diagnosis >> External Pages >> Different car >> Section 356 (Engine Control System (DTC/Circuit Diagnosis) (17 Of 17)) >> DTC/Circuit Diagnosis >> High Pressure Fuel Pump >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different car, the 2019 Infiniti QX60. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK FUSE 
    1. Turn ignition switch OFF.
    2. Check that the following fuse is not blowing.

      Fuse No.

      Capacity

      #75

      10A

    Is the fuse blown (open)?

    YES

    Replace the fuse after repairing the applicable circuit.

    NO

    GO TO 2.

  2. CHECK HIGH PRESSURE FUEL PUMP POWER SUPPLY 
    1. Turn ignition switch ON.
    2. Check the voltage between ECM harness connector and ground.

      +

      -

      Voltage

      ECM

      Connector

      Terminal

      F78

      1

      Ground

      Battery voltage

    Is the inspection result normal?

    YES

    GO TO 9.

    NO

    GO TO 3.

  3. CHECK HIGH PRESSURE FUEL PUMP POWER SUPPLY CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Disconnect high pressure fuel pump relay harness connector.
    4. Check the continuity between ECM harness connector and high pressure fuel pump relay harness connector.

      ECM

      High pressure fuel pump relay

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      F78

      1

      E10

      5

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

    Is the inspection result normal?

    YES

    GO TO 4.

    NO

    Repair or replace malfunctioning part.

  4. CHECK HIGH PRESSURE FUEL PUMP RELAY POWER SUPPLY (CONTACT SIDE) 

    Check the voltage between high pressure fuel pump relay harness connector and ground.

    +

    -

    Voltage

    High pressure fuel pump relay

    Connector

    Terminal

    E10

    3

    Ground

    Battery voltage

    Is the inspection result normal?

    YES

    GO TO 5.

    NO

    Perform the trouble diagnosis for power supply circuit.

  5. CHECK HIGH PRESSURE FUEL PUMP RELAY POWER SUPPLY (EXCITATION COIL SIDE) 
    1. Install all removed parts.
    2. Turn ignition switch ON.
    3. Check the voltage between high pressure fuel pump relay harness connector and ground.

      +

      -

      Voltage

      High pressure fuel pump relay

      Connector

      Terminal

      E10

      1

      Ground

      Battery voltage

    Is the inspection result normal?

    YES

    GO TO 7.

    NO

    GO TO 6.

  6. CHECK HIGH PRESSURE FUEL PUMP RELAY POWER SUPPLY CIRCUIT (EXCITATION COIL SIDE) 
    1. Turn ignition switch OFF.
    2. Disconnect IPDM E/R harness connector.
    3. Disconnect high pressure fuel pump relay harness connector.
    4. Check the continuity between IPDM E/R harness connector and high pressure fuel pump relay harness connector.

      IPDM E/R

      High pressure fuel pump relay

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      F19

      59

      E10

      1

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

    Is the inspection result normal?

    YES

    Perform the trouble diagnosis for power supply circuit.

    NO

    Repair or replace malfunctioning part.

  7. CHECK HIGH PRESSURE FUEL PUMP RELAY GROUND CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect high pressure fuel pump relay harness connector.
    3. Check the continuity between high pressure fuel pump relay harness connector and ground.

      High pressure fuel pump relay

      --

      Continuity

      Connector

      Terminal

      E10

      2

      Ground

      Existed
    4. Also check harness for short to ground.

    Is the inspection result normal?

    YES

    GO TO 8.

    NO

    Repair or replace malfunctioning part.

  8. CHECK HIGH PRESSURE FUEL PUMP RELAY 

    Refer to Component Inspection (High Pressure Fuel Pump Relay) .

    Is the inspection result normal?

    YES

    Check intermittent incident. Refer to Intermittent Incident .

    NO

    Replace high pressure fuel pump relay.

  9. CHECK ECM GROUND CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check the continuity between ECM harness connector and ground.

      ECM

      --

      Continuity

      Connector

      Terminal

      F78

      2

      Ground

      Existed

      7

      F79

      87

      88

      95

      E32

      199

      201

      204
    4. Also check harness for short to power.

    Is the inspection result normal?

    YES

    GO TO 10.

    NO

    Repair or replace malfunctioning part.

  10. CHECK HIGH PRESSURE FUEL PUMP CIRCUIT 
    1. Disconnect high pressure fuel pump relay harness connector.
    2. Check the continuity between ECM harness connector and high pressure fuel pump harness connector.

      ECM

      High pressure fuel pump

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      F78

      9

      F96

      2

      Existed

      10

      1
    3. Also check harness for short to ground and short to power.

    Is the inspection result normal?

    YES

    GO TO 11.

    NO

    Repair or replace malfunctioning part.

  11. CHECK HIGH PRESSURE FUEL PUMP 

    Refer to Component Inspection (High Pressure Fuel Pump) .

    Is the inspection result normal?

    YES

    GO TO 12.

    NO

    Replace high pressure fuel pump. Refer to Removal and Installation .

  12. CHECK HIGH PRESSURE FUEL PUMP INSTALLATION 
    1. Turn ignition switch OFF.
    2. Check high pressure fuel pump for improper attachment or looseness.

    Is the inspection result normal?

    YES

    GO TO 13.

    NO

    Repair or replace malfunctioning part.

  13. CHECK CAMSHAFT 
    1. Remove camshaft. Refer to CAMSHAFT .
    2. Check camshaft. Refer to CAMSHAFT .

    Is the inspection result normal?

    YES

    Check intermittent incident. Refer to Intermittent Incident .

    NO

    Replace camshaft. Refer to CAMSHAFT .

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