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Diagnostic Procedure

WARNING: This page is about a different car, the 2005 Nissan Frontier. 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.
      CONTROL UNIT HARNESS CONNECTOR TERMINAL VOLTAGE SPECIFICATIONS (IGNITION OFF)

      Connector Terminal Voltage (Approx.)
      M152 25 - Ground 0V
      M153 27 - Ground
      Fig 1: Checking Voltage Between Transfer Control Unit Harness Connector Terminal And Ground (ignition Off)
      G03595344Courtesy 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.
      CONTROL UNIT HARNESS CONNECTOR TERMINAL VOLTAGE SPECIFICATIONS (IGNITION ON)

      Connector Terminal Voltage (Approx.)
      M152 25 - Ground Battery voltage
      M153 27 - Ground
      Fig 2: Checking Voltage Between Transfer Control Unit Harness Connector Terminals And Ground (Ignition On)
      G03595345Courtesy 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. 57, located in the fuse and relay box).
      • 40A fusible link (No. j, located in the fuse and fusible link box).
      • Harness for short or open between battery and transfer shut off relay 1 harness connector E156 terminal 3.
      • Harness for short or open between transfer control unit harness connector M153 terminal 27 and transfer shut off relay 1 harness connector E156 terminal 5.
      • Harness for short or open between ignition switch and transfer shut off relay 1 harness connector E156 terminal 1.
      • Harness for short or open between transfer shut off relay 1 harness connector E156 terminal 2 and ground.
      • Harness for short or open between ignition switch and transfer control unit harness connector M152 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".
    2. Disconnect transfer control unit harness connector.
    3. Check continuity between transfer control unit harness connector M153 terminal 32 and ground.

      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.
      Fig 3: Checking Continuity Between Transfer Control Unit Harness Connector M153 Terminal 32 And Ground
      G03595346Courtesy of NISSAN MOTOR CO., U.S.A.
  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.
      TRANSFER CONTROL UNIT HARNESS CONNECTOR TERMINAL 40 VOLTAGE SPECIFICATION (IGNITION OFF)

      Connector Terminal Voltage (Approx.)
      M153 40 - Ground Battery voltage
      Fig 4: Checking Voltage Between Transfer Control Unit Harness Connector Terminal And Ground (Ignition Off)
      G03595347Courtesy 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 terminal and ground.
      TRANSFER CONTROL UNIT HARNESS CONNECTOR TERMINAL 40 VOLTAGE SPECIFICATION (IGNITION ON)

      Connector Terminal Voltage (Approx.)
      M153 40 - Ground 0V
      Fig 5: Checking Voltage Between Transfer Control Unit Harness Connector Terminal And Ground (Ignition On)
      G03595348Courtesy of NISSAN MOTOR CO., U.S.A.

    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 shut off relay 2 harness connector E157 terminal 1.
      • Harness for short or open between transfer shut off relay 2 harness connector E157 terminal 2 and transfer control unit harness connector M153 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 

    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 "TRANSFER CONTROL UNIT ".
    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 "TRANSFER CONTROL UNIT ".
    2. NO: Inspection End.
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