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Home >> Nissan-Datsun >> 2004 >> Sentra SE-R >> Repair and Diagnosis (Single Page) >> External Pages >> Different car >> Section 1563 (Transfer Case) >> Trouble Diagnosis For System >> Power Supply Circuit For Transfer Control Unit >> Diagnostic Procedure
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Diagnostic Procedure

WARNING: This page is about a different car, the 2005 Nissan Titan. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK POWER SUPPLY 
    1. Turn ignition switch "OFF".
    2. Disconnect transfer control unit harness connector.
    3. Check voltage between transfer control unit harness connector terminals and ground.
      Fig 1: Checking Voltage Between Transfer Control Unit Harness Connector Terminals And Ground
      G03602724Courtesy of NISSAN MOTOR CO., U.S.A.
      VOLTAGE BETWEEN TRANSFER CONTROL UNIT HARNESS CONNECTOR TERMINALS AND GROUND REFERENCE

      Connector Terminal (Wire color) Voltage (Approx.)
      E142 19 (W) - Ground Battery voltage
      25 (L/W) - Ground 0V
      E143 40 (Y) - Ground Battery voltage
      44 (Y/R) - Ground 0V
      45 (Y/R) - Ground
    4. Turn ignition switch "ON". (Do not start engine.)
    5. Check voltage between transfer control unit harness connector terminals and ground.
      Fig 2: Checking Voltage Between Transfer Control Unit Harness Connector Terminals And Ground
      G03602725Courtesy of NISSAN MOTOR CO., U.S.A.
      VOLTAGE BETWEEN TRANSFER CONTROL UNIT HARNESS CONNECTOR TERMINALS AND GROUND REFERENCE

      Connector Terminal (Wire color) Voltage (Approx.)
      E142 19 (W) - Ground Battery voltage
      25 (L/W) - Ground
      E143 40 (Y) - Ground
      44 (Y/R) - Ground
      45 (Y/R) - Ground

    OK or NG 

    1. OK: GO TO 2.
    2. NG: Check the following. If any items are damaged, repair or replace damaged parts.
      • 10A fuses [No. 26 located in the fuse and fusible link box or 59 located in the fuse and relay box]
      • 20A fuse [No. 53, located in the IPDM E/R]
      • Harness for short or open between battery and transfer control unit harness connector E142 terminal 19 (W), and connector E143 terminals 40 (Y), 44 (Y/R) and 45 (Y/R)
      • Harness for short or open between ignition switch and transfer control unit harness connector E142 terminal 25 (L/W)
      • Harness for short or open between ignition switch and transfer relay 1 harness connector E46 terminal 2 (L/W)
      • Harness for short or open between transfer relay 1 harness connector E46 terminal 1 (B) and ground
      • Battery and ignition switch. Refer to "POWER SUPPLY ROUTING CIRCUIT ".
      • Transfer relay 1, 2. Refer to "COMPONENT INSPECTION ".
  2. CHECK GROUND CIRCUIT 
    1. Turn ignition switch "OFF".
    2. Disconnect transfer control unit harness connector.
    3. Check continuity between transfer control unit harness connector E142 terminals 6 (B), 18 (B), E143 terminal 32 (B) and ground.
      Fig 3: Checking Continuity Between E142 Terminals 6 And 18 And E143 Terminal 32 And Ground
      G03602726Courtesy of NISSAN MOTOR CO., U.S.A.

      Continuity should exist. 

      Also check harness for short to power.

    OK or NG 

    1. OK: GO TO 3.
    2. 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 

    1. OK: GO TO 4.
    2. 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 

    1. OK: Inspection End.
    2. NG: Replace transfer control unit. Refer to "REMOVAL AND INSTALLATION ".
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