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Diagnostic Procedure

WARNING: This page is about a different car, the 2006 Nissan Pathfinder. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK POWER SUPPLY 
    1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
    2. Connect transfer control unit harness connector.
    3. Check voltage between transfer control unit harness connector terminals and ground.
      TRANSFER CONTROL UNIT HARNESS CONNECTOR TERMINALS AND GROUND (VOLTAGE)

      Connector Terminal Voltage (Approx.)
      M152 16 - Ground 0V
      22 - Ground
      M153 29 - Ground
      30 - Ground Battery voltage
      47 - Ground
      Fig 1: Checking Voltage Between Transfer Control Unit Harness Connector Terminals And Ground
      G04174449Courtesy of NISSAN MOTOR CO., U.S.A.
    4. Turn ignition switch "ON". (Do not start engine.)
    5. Check voltage between transfer control unit harness connector terminals and ground.
    TRANSFER CONTROL UNIT HARNESS CONNECTOR TERMINALS AND GROUND (VOLTAGE)

    Connector Terminal Voltage (Approx.)
    M152 16 - Ground Battery voltage
    22 - Ground
    M153 29 - Ground
    30 - Ground 0V
    47 - Ground Battery voltage
    Fig 2: Checking Voltage Between Transfer Control Unit Harness Connector Terminals And Ground
    G04174450Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: GO TO 2.

    NG: Check the following. If any items are damaged, repair or replace damaged parts.

    • 10A fuses [No. 21 located in fuse block (J/B) and No. 59 located in the fuse and relay box. Refer to "POWER SUPPLY ROUTING CIRCUIT ".
    • Harness for short or open between battery and transfer control unit harness connector M153 terminals 47.
    • Harness for short or open between ignition switch and transfer control unit harness connector M153 terminal 29.
    • Harness for short or open between battery and transfer shut off relay harness connector E155 terminal 1 and 3.
    • Harness for short or open between transfer shut off relay harness connector E155 terminal 2 and transfer control unit harness connector M153 terminal 30.
    • Harness for short or open between transfer shut off relay harness connector E155 terminal 5 and transfer control unit harness connector M152 terminals 16 and 22.
    • Battery and ignition switch. Refer to "POWER SUPPLY ROUTING CIRCUIT ".
    • Transfer shut off relay. Refer to , "COMPONENT INSPECTION ".
  2. CHECK GROUND CIRCUIT 
    1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
    2. Disconnect transfer control unit harness connector.
    3. Check continuity between transfer control unit harness connector M152 terminals 3, 6, M153 terminal 45 and ground.

      Continuity should exist. 

    Fig 3: Checking Continuity Between Transfer Control Unit Connector M152 Terminals 3, 6, M153 Terminal 45 And Ground
    G04174451Courtesy of NISSAN MOTOR CO., U.S.A.

    Also check harness for short to power.

    OK or NG 

    OK: GO TO 3.

    NG: Repair open circuit or short to power in harness or connectors.

  3. CHECK TRANSFER CONTROL UNIT 

    Check transfer control unit input/output signal. Refer to , "TRANSFER CONTROL UNIT INPUT/OUTPUT SIGNAL REFERENCE VALUES ".

    OK or NG 

    OK: GO TO 4.

    NG: Check transfer control unit pin terminals for damage or loose connection with harness connector. If any items are damaged, repair or replace damaged parts.

  4. CHECK DTC 

    Perform the self-diagnosis, after driving a vehicle for a while.

    OK or NG 

    OK: Inspection End.

    NG: Replace transfer control unit. Refer to , "REMOVAL AND INSTALLATION ".

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