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Diagnostic Procedure

WARNING: This page is about a different car, the 2006 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". (Stay for at least 5 seconds.)
    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
      G04186390Courtesy of NISSAN MOTOR CO., U.S.A.
      TERMINALS VOLTAGE REFERENCE

      Connector Terminal Voltage (Approx.)
      E142 25 - Ground 0V
      E143 27 - 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
      G04186391Courtesy of NISSAN MOTOR CO., U.S.A.
      TERMINALS VOLTAGE REFERENCE

      Connector Terminal Voltage (Approx.)
      E142 25 - Ground Battery voltage
      E143 27 - Ground

    OK or NG 

    OK: GO TO 2.

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

    • 10A fuse (No. 59, located in the fuse and relay block).
    • Harness for short or open between battery and transfer shut off relay 1 harness connector E46 terminal 5.
    • Harness for short or open between transfer control unit harness connector E143 terminal 27 and transfer shut off relay 1 harness connector E46 terminal 3.
    • Harness for short or open between ignition switch and transfer shut off relay 1 harness connector E46 terminal 2.
    • Harness for short or open between transfer shut off relay 1 harness connector E46 terminal 1 and ground.
    • Harness for short or open between ignition switch and transfer control unit harness connector E142 terminal 25.
    • Battery and ignition switch. Refer to "POWER SUPPLY ROUTING CIRCUIT ".
    • Transfer shut off relay 1. 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 E143 terminal 32 and ground.

      Continuity should exist. 

      Fig 3: Checking Continuity Between Transfer Control Unit Harness Connector E143 Terminal 32 And Ground
      G04186392Courtesy 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 POWER SUPPLY SIGNAL 
    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 terminal and ground.
      Fig 4: Checking Voltage Between Transfer Control Unit Harness Connector Terminal And Ground
      G04186393Courtesy of NISSAN MOTOR CO., U.S.A.
      TERMINALS VOLTAGE REFERENCE

      Connector Terminal Voltage (Approx.)
      E143 40 - 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
      G04186394Courtesy of NISSAN MOTOR CO., U.S.A.
      TERMINALS VOLTAGE REFERENCE

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

    OK or NG 

    OK: GO TO 4.

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

    • Harness for short or open between battery and transfer shut off relay 2 harness connector E47 terminal 1.
    • Harness for short or open between transfer shut off relay 2 harness connector E47 terminal 2 and transfer control unit harness connector E143 terminal 40.
    • Transfer shut off 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 

    OK-1: With CONSULT-II: GO TO 5.

    OK-2: Without CONSULT-II: GO TO  6.

    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? 

    YES: Replace transfer control unit. Refer to "TRANSFER CONTROL UNIT ".

    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? 

    YES: Replace transfer control unit. Refer to "TRANSFER CONTROL UNIT ".

    NO: Inspection End.

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