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Home >> Nissan-Datsun >> 2021 >> NV2500 HD S >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 3 (Engine Control System (DTC/Circuit Diagnosis) (5.6L) (6 Of 6)) >> DTC/Circuit Diagnosis >> High Pressure Fuel Pump >> DTC Diagnosis Procedure

DTC Diagnosis Procedure

WARNING: This page is about a different variant/trim than selected.
  1. 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

      51

      Ground

      Battery voltage

    Is inspection result normal?

    YES

    GO TO 8.

    NO

    GO TO 2.

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

      +

      -

      Continuity

      ECM

      High pressure fuel pump and injector relay

      Connector

      Terminal

      Connector

      Terminal

      F78

      51

      E172

      3

      Existed
    5. Also check harness for short to ground.

    Is the inspection result normal?

    YES

    GO TO 3.

    NO

    Repair or replace error-detected parts

  3. CHECK HIGH PRESSURE FUEL PUMP AND INJECTOR RELAY POWER SUPPLY (CONTACT SIDE) 

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

    +

    -

    Voltage

    High pressure fuel pump and injector relay

    Connector

    Terminal

    E172

    5

    Ground

    Battery voltage

    Is the inspection result normal?

    YES

    GO TO 4.

    NO

    Perform the trouble diagnosis for power supply circuit. Refer to DTC Diagnosis Procedure .

  4. CHECK HIGH PRESSURE FUEL PUMP AND INJECTOR RELAY POWER SUPPLY (EXCITATION COIL SIDE) 
    1. Reconnect all harness connectors disconnected.
    2. Turn ignition switch ON.
    3. Check the voltage between high pressure fuel pump and injector relay harness connector and ground.

      +

      -

      Voltage

      High pressure fuel pump and injector relay

      Connector

      Terminal

      E172

      1

      Ground

      Battery voltage

    Is the inspection result normal?

    YES

    GO TO 6.

    NO

    GO TO 5

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

      +

      -

      Continuity

      IPDM E/R

      High pressure fuel pump and injector relay

      Connector

      Terminal

      Connector

      Terminal

      E121

      26

      E172

      2

      Existed
    5. Also check harness for short to ground.

    Is the inspection result normal?

    YES

    Perform the trouble diagnosis for power supply circuit. Refer to DTC Diagnosis Procedure .

    NO

    Repair or replace error-detected parts.

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

      +

      -

      Continuity

      High pressure fuel pump and injector relay

      Connector

      Terminal

      E172

      1

      Ground

      Existed
    4. Also check harness for short to power.

    Is the inspection result normal?

    YES

    GO TO 7.

    NO

    Repair or replace error-detected parts.

  7. CHECK HIGH PRESSURE FUEL PUMP AND INJECTOR RELAY 

    Check the high pressure fuel pump and injector relay. Refer to Component Inspection (High Pressure Fuel Pump And Injector Relay) .

    Is inspection result normal?

    YES

    GO TO 8.

    NO

    Replace high pressure fuel pump and injector relay.

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

      +

      -

      Continuity

      ECM

      High pressure fuel pump

      Connector

      Terminal

      Connector

      Terminal

      E79

      59

      F87

      1

      Existed

      60

      2
    4. Also check harness for short to ground and to power.

    Is inspection result normal?

    YES

    GO TO 9.

    NO

    Repair or replace error-detected parts.

  9. CHECK HIGH PRESSURE FUEL PUMP SOLENOID 

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

    Is inspection result normal?

    YES

    GO TO 10.

    NO

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

  10. CHECK HIGH PRESSURE FUEL PUMP INSTALLATION CONDITION 
    1. Turn ignition switch OFF.
    2. Check that the high pressure fuel pump is installed with no backlash and looseness.

    Is the inspection result normal?

    YES

    GO TO 11.

    NO

    Repair or replace error-detected parts.

  11. CHECK CAMSHAFT 
    1. Remove camshaft. Refer to Removal and Installation .
    2. Check camshaft. Refer to Inspection .

    Is inspection result normal?

    YES

    INSPECTION END

    NO

    Replace camshaft. Refer to Removal and Installation .

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