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Home >> Nissan-Datsun >> 2021 >> NV2500 HD S >> Repair and Diagnosis >> External Pages >> Different car >> Section 174 (Rear Final Drive: Ma248 (Eld)) >> Rear Final Drive: Ma248 (Eld) >> DTC/Circuit Diagnosis >> DTC P18CD: Self Shutdown >> 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 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 3  .

    NO

    GO TO STEP 2  .

  2. 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.

  3. 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

    GO TO STEP 4  .

    NO

    Repair or replace the malfunctioning parts.

  4. CHECK TERMINALS AND HARNESS CONNECTORS 

    Check differential lock control unit pin terminals for damage or loose connection with harness connector.

    Is the inspection result normal?

    YES

    After turning the ignition switch OFF, perform DTC confirmation procedure again. When DTC "P18CD" is detected, replace differential lock control unit. Refer to Removal and Installation .

    NO

    Repair or replace the malfunctioning parts.

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