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Home >> Nissan-Datsun >> 2021 >> NV2500 HD S >> Repair and Diagnosis >> External Pages >> Different car >> Section 307 (Engine Control System (DTC/Circuit Diagnosis) (4.0L) (1 Of 4)) >> DTC/Circuit Diagnosis >> Power Supply And Ground Circuit >> DTC Diagnosis Procedure

DTC Diagnosis Procedure

WARNING: This page is about a different car, the 2018 Nissan NV3500 HD, 2018 Nissan NV2500 HD, and 2018 Nissan NV1500. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK FUSE 

    Check that the following fuse is not blown.

    Location

    Fuse No.

    Capacity

    Fuse block (J/B)

    #12

    10 A

    IPDM E/R

    #53

    20 A

    Is the inspection result normal?

    YES

    Replace the fuse after repairing the applicable circuit. (If the replaced fuse is blown again, check the power supply circuit upstream of IPDM E/R or fuse box [J/B].)

    NO

    GO TO 2 .

  2. CHECK GROUND CONNECTION 
    1. Turn ignition switch OFF.
    2. Check ground connection E9. Refer to Ground Inspection in Circuit Inspection .

    Is the inspection result normal?

    YES

    GO TO 3 .

    NO

    Repair or replace ground connection.

  3. CHECK ECM GROUND CIRCUIT 
    1. Disconnect ECM harness connector.
    2. Check the continuity between ECM harness connector and ground.

      +

      -

      Continuity

      ECM

      Connector

      Terminal

      E16

      123

      Ground

      Existed

      124

      127

      128

      F54

      12

      16
    3. Also check harness for short to power.

    Is the inspection result normal?

    YES

    GO TO 4 .

    NO

    Repair or replace error-detected parts.

  4. CHECK IGNITION SWITCH SIGNAL 
    1. Reconnect ECM harness connector.
    2. Turn ignition switch ON.
    3. Check the voltage between ECM harness connector terminals as per the following condition.

      ECM

      Condition

      Voltage

      (Approx.)

      Connector

      +

      -

      Terminal

      E16

      109

      128

      Ignition switch: OFF

      0 V

      Ignition switch: ON

      Battery voltage

    Is the inspection result normal?

    YES

    GO TO 5 .

    NO

    Perform trouble diagnosis for power supply circuit.

  5. CHECK ECM POWER SUPPLY-I 
    1. Turn ignition switch ON.
    2. Check the voltage between ECM harness connector terminals.

      ECM

      Voltage

      (Approx.)

      Connector

      +

      -

      Terminal

      E16

      121

      128

      Battery voltage

    Is the inspection result normal?

    YES

    GO TO 6 .

    NO

    GO TO 7 .

  6. CHECK ECM POWER SUPPLY-II 
    1. Turn ignition switch OFF and wait at least 10 seconds.
    2. Check the voltage between ECM harness connector terminals as per the following.

      ECM

      Condition

      Voltage

      (Approx.)

      Connector

      +

      -

      Terminal

      E16

      121

      128

      After turning ignition switch OFF, battery voltage will exist for a few seconds

      Drop to 0 V

    Is the inspection result normal?

    YES

    GO TO 10 .

    NO

    GO TO 8 .

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

      +

      -

      Continuity

      ECM

      IPDM E/R

      Connector

      Terminal

      Connector

      Terminal

      E16

      121

      E119

      4

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

    Is the inspection result normal?

    YES

    Perform the trouble diagnosis for IPDM E/R power supply circuit.

    NO

    Repair or replace error-detected parts.

  8. CHECK ECM RELAY CONTROL SIGNAL 
    1. Reconnect ECM and IPDM E/R harness connector.
    2. Check the voltage between ECM harness connector terminals as per the following condition.

      ECM

      Condition

      Voltage

      (Approx.)

      +

      -

      Connector

      Terminal

      Connector

      Terminal

      F54

      31

      E16

      128

      Ignition switch: ON

      0 V

      Turn ignition switch OFF and wait at least 10 seconds.

      Battery voltage

    Is the inspection result normal?

    YES

    Replace IPDM E/R. Refer to Removal and Installation .

    NO

    GO TO 9 .

  9. CHECK ECM RELAY CONTROL SIGNAL CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Disconnect IPDM E/R harness connector.
    4. Check the continuity between ECM harness connector and IPDM E/R harness connector.

      +

      -

      Continuity

      ECM

      IPDM E/R

      Connector

      Terminal

      Connector

      Terminal

      F54

      31

      E119

      7

      Existed

    Is the inspection result normal?

    YES

    Replace IPDM E/R. Refer to Removal and Installation .

    NO

    Repair or replace error-detected parts.

  10. CHECK ECM POWER SUPPLY (BACK-UP) 
    1. Turn ignition switch OFF.
    2. Check the voltage between ECM harness connector terminals.

      ECM

      Voltage

      (Approx.)

      +

      -

      Connector

      Terminal

      Connector

      Terminal

      F54

      26

      E16

      128

      Battery voltage

    Is the inspection result normal?

    YES

    Check intermittent incident. Refer to Intermittent Incident .

    NO

    GO TO 11 .

  11. CHECK ECM POWER SUPPLY (BACK-UP) CIRCUIT 
    1. Disconnect ECM harness connector.
    2. Disconnect IPDM E/R harness connector.
    3. Check the continuity between ECM harness connector and IPDM E/R harness connector.

      +

      -

      Continuity

      ECM

      IPDM E/R

      Connector

      Terminal

      Connector

      Terminal

      F54

      26

      E121

      30

      Existed

    Is the inspection result normal?

    YES

    Perform trouble diagnosis for power supply circuit.

    NO

    Repair or replace error-detected parts.

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