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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 terminal and ground.
      Fig 1: Checking Voltage Between Transfer Control Unit Harness Connector Terminal And Ground
      G03602758Courtesy of NISSAN MOTOR CO., U.S.A.
      VOLTAGE BETWEEN TRANSFER CONTROL UNIT HARNESS CONNECTOR TERMINAL AND GROUND REFERENCE

      Connector Terminal (Wire color) Voltage (Approx.)
      E142 25 (L/W) - Ground 0V
      E143 27 (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
      G03602759Courtesy 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 25 (L/W) - Ground Battery voltage
      E143 27 (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]
      • Harness for short or open between battery and transfer control unit harness connector E143 terminal 27 (Y/R)
      • 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 ignition switch and transfer control unit harness connector E142 terminal 25 (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. Refer to "COMPONENT INSPECTION ".
  2. CHECK GROUND CIRCUIT 
    1. Disconnect transfer control unit harness connector.
    2. Check continuity between transfer control unit harness connector E143 terminal 32 (B) and ground.

      Continuity should exist. 

      Fig 3: Checking Continuity Between Transfer Control Unit Harness Connector E143 Terminal 32 And Ground
      G03602760Courtesy of NISSAN MOTOR CO., U.S.A.

      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 POWER SUPPLY SIGNAL 
    1. Turn ignition switch "OFF".
    2. Connect transfer control unit harness connector.
    3. Check voltage between transfer control unit harness connector terminal and ground.
      Fig 4: Checking Voltage Between Transfer Control Unit Harness Connector Terminal And Ground
      G03602761Courtesy of NISSAN MOTOR CO., U.S.A.
      VOLTAGE BETWEEN TRANSFER CONTROL UNIT HARNESS CONNECTOR TERMINAL AND GROUND REFERENCE

      Connector Terminal (Wire color) Voltage (Approx.)
      E143 40 (Y) - Ground Battery voltage
    4. Turn ignition switch "ON". (Do not start engine.)
    5. Check voltage between transfer control unit harness connector terminal and ground.
      Fig 5: Checking Voltage Between Transfer Control Unit Harness Connector Terminal And Ground
      G03602762Courtesy of NISSAN MOTOR CO., U.S.A.
      VOLTAGE BETWEEN TRANSFER CONTROL UNIT HARNESS CONNECTOR TERMINAL AND GROUND REFERENCE

      Connector Terminal (Wire color) Voltage (Approx.)
      E143 40 (Y) - Ground 0V

    OK or NG 

    1. OK: GO TO 4.
    2. NG: Check the following. If any items are damaged, repair or replace damaged parts.
      • Harness for short or open between battery and transfer control unit harness connector E143 terminal 40 (Y)
      • Transfer relay 2. Refer to "COMPONENT INSPECTION ".
  4. 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-1: With CONSULT-II: GO TO 5.
    2. OK-2: Without CONSULT-II: GO TO 6.
    3. 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.

  5. PERFORM SELF-DIAGNOSIS (WITH CONSULT-II) 

    With CONSULT-II 

    1. Turn ignition switch "ON". (Do not start engine.)
    2. Select "SELF-DIAG RESULTS" mode for "ALL MODE AWD/4WD" with CONSULT-II.
    3. Touch "ERASE".
    4. Turn ignition switch "OFF" and wait at least 10 seconds.
    5. Perform the self-diagnosis again.

    Is the "SHIFT ACT CIR [P1819]" displayed? 

    1. YES: Replace transfer control unit. Refer to "REMOVAL AND INSTALLATION ".
    2. NO: Inspection End.
  6. PERFORM SELF-DIAGNOSIS (WITHOUT CONSULT-II) 

    Without CONSULT-II 

    1. Perform the self-diagnosis and then erase self-diagnostic results. Refer to "SELF-DIAGNOSTIC PROCEDURE (WITHOUT CONSULT-II) " and "ERASE SELF-DIAGNOSIS ".
    2. Perform the self-diagnosis again.

    Do the self-diagnostic results indicate transfer control device? 

    1. YES: Replace transfer control unit. Refer to "REMOVAL AND INSTALLATION ".
    2. NO: Inspection End.
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