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Home >> Nissan-Datsun >> 2021 >> NV2500 HD S >> Repair and Diagnosis >> External Pages >> Different car >> Section 175 (Rear Final Drive: Ma241 (Eld)) >> Rear Final Drive: Ma241 (Eld) >> DTC/Circuit Diagnosis >> Power Supply And Ground Circuit >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different car, the 2018 Nissan Titan XD and 2018 Nissan Titan. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK IGNITION SIGNAL VOLTAGE 
    1. Turn the ignition switch OFF.
    2. Disconnect differential lock control unit harness connector.
    3. Check the voltage between differential lock control unit harness connector and ground.

      Differential lock control unit

      -

      Voltage

      (Approx.)

      Connector

      Terminal

      B77

      7

      Ground

      0 V
    4. Turn the ignition switch ON.
      CAUTION: Never start the engine.
    5. Check the voltage between differential lock control unit harness connector and ground.

      Differential lock control unit

      -

      Voltage

      (Approx.)

      Connector

      Terminal

      B77

      7

      Ground

      Battery voltage

    Is the inspection result normal?

    YES

    GO TO STEP 3  .

    NO

    GO TO STEP 2  .

  2. CHECK IGNITION SIGNAL CIRCUIT 
    1. Turn the ignition switch OFF.
    2. Check fuse [No. 30 located in the fuse block (J/B)].
    3. Disconnect fuse block (J/B) harness connector.
    4. Check the continuity between differential lock control unit harness connector and fuse block (J/B) harness connector.

      Differential lock control unit

      Fuse block (J/B)

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      B77

      7

      M4

      7P

      Yes
    5. Check the continuity between differential lock control unit harness connector and the ground.

      Differential lock control unit

      -

      Continuity

      Connector

      Terminal

      B77

      7

      Ground

      No

    Is the inspection result normal?

    YES

    Perform the trouble diagnosis for ignition power supply circuit. Refer to SYSTEM WIRING DIAGRAMS .

    NO

    Repair or replace the malfunctioning parts.

  3. CHECK DIFFERENTIAL LOCK CONTROL UNIT POWER SUPPLY VOLTAGE 
    1. Turn the ignition switch OFF.
    2. Check the voltage between differential lock control unit harness connector and ground.

      Differential lock control unit

      -

      Voltage

      (Approx.)

      Connector

      Terminal

      B77

      15

      Ground

      Battery voltage
    3. Turn the ignition switch ON.
      CAUTION: Never start the engine.
    4. Check the voltage between differential lock control unit harness connector and ground.

      Differential lock control unit

      -

      Voltage

      (Approx.)

      Connector

      Terminal

      B77

      15

      Ground

      Battery voltage

    Is the inspection result normal?

    YES

    GO TO STEP 5  .

    NO

    GO TO STEP 4  .

  4. CHECK DIFFERENTIAL LOCK CONTROL UNIT POWER SUPPLY CIRCUIT 
    1. Turn the ignition switch OFF.
    2. Check fuse [No. 6 located in the fuse block (J/B)].
    3. Disconnect fuse block (J/B) harness connector.
    4. Check the continuity between differential lock control unit harness connector and fuse block (J/B) harness connector.

      Differential lock control unit

      Fuse block (J/B)

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      B77

      15

      M70

      15R

      Yes
    5. Check the continuity between differential lock control unit harness connector and the ground.

      Differential lock control unit

      -

      Continuity

      Connector

      Terminal

      B77

      15

      Ground

      No

    Is the inspection result normal?

    YES

    Perform the trouble diagnosis for power supply circuit. Refer to SYSTEM WIRING DIAGRAMS .

    NO

    Repair or replace the malfunctioning parts.

  5. CHECK DIFFERENTIAL LOCK SOLENOID POWER SUPPLY VOLTAGE 
    1. Turn the ignition switch OFF.
    2. Check the voltage between differential lock control unit harness connector and ground.

      Differential lock control unit

      -

      Voltage

      (Approx.)

      Connector

      Terminal

      B77

      9

      Ground

      Battery voltage
    3. Turn the ignition switch ON.
      CAUTION: Never start the engine.
    4. Check the voltage between differential lock control unit harness connector and ground.

      Differential lock control unit

      -

      Voltage

      (Approx.)

      Connector

      Terminal

      B77

      9

      Ground

      Battery voltage

    Is the inspection result normal?

    YES

    GO TO STEP 7  .

    NO

    GO TO STEP 6 

  6. CHECK DIFFERENTIAL LOCK SOLENOID POWER SUPPLY CIRCUIT 
    1. Turn the ignition switch OFF.
    2. Check the 10 A fuse (No. 64).
    3. Disconnect fusible link box LH connector. Refer to SYSTEM WIRING DIAGRAMS .
    4. Check the continuity between differential lock control unit harness connector and fusible link box LH harness connector.

      Differential lock control unit

      Fusible link box LH

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      B77

      9

      E148 (VK56VD)

      3

      Yes
    5. Check the continuity between differential lock control unit harness connector and the ground.

      Differential lock control unit

      -

      Continuity

      Connector

      Terminal

      B77

      9

      Ground

      No

    Is the inspection result normal?

    YES

    Perform the trouble diagnosis for power supply circuit. Refer to SYSTEM WIRING DIAGRAMS .

    NO

    Repair or replace the malfunctioning parts.

  7. CHECK DIFFERENTIAL LOCK CONTROL UNIT GROUND 
    1. Turn the ignition switch OFF.
    2. Check the continuity between differential lock control unit harness connector and ground.

      Differential lock control unit

      -

      Continuity

      Connector

      Terminal

      B77

      10

      Ground

      Yes

      11

    Is the inspection result normal?

    YES

    Inspection End.

    NO

    Repair or replace the malfunctioning parts.

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