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Home >> Nissan-Datsun >> 2004 >> Sentra SE-R Spec V >> Repair and Diagnosis >> External Pages >> Different car >> Section 383 (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 2004 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: Voltage Chart
      G00728743Courtesy of NISSAN MOTOR CO., U.S.A.
      Fig 2: Checking Voltage
      G00728744Courtesy 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.
    Fig 3: Voltage Chart
    G00728745Courtesy of NISSAN MOTOR CO., U.S.A.
    Fig 4: Checking Voltage
    G00728746Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK: GO TO 2.
    2. NG: Check the following. If any items are damaged, repair or replace damaged parts.
    • 10A fuse [No. 26 or 59, located in the IPDM E/R]
    • 20A fuse [No. 53, located in the IPDM E/R]
    • Harness for short or open between battery and transfer control unit harness connector terminals 19, 40, 44 and 45
    • Harness for short or open between ignition switch and transfer control unit harness connector terminal 25
    • 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 DISTRIBUTION in SYSTEM WIRING DIAGRAMS - TITAN article in ELECTRICAL. .
    • 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.

    Continuity should exist. 

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

    OK or NG 

    1. OK: GO TO 3.
    2. NG: Repair open circuit or short to ground or short to power in harness or connectors.
    Fig 5: Checking Resistance
    G00728747Courtesy of NISSAN MOTOR CO., U.S.A.
  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.
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