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Home >> Nissan-Datsun >> 2003 >> Sentra Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 2036 (Transfer Case) >> TX15B >> Trouble Diagnosis For Symptoms >> 4WD Shift Indicator Lamp and 4LO Indicator Lamp Do Not Turn ON >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2007 Nissan Pathfinder. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK TRANSFER CONTROL UNIT POWER SUPPLY CIRCUIT 
    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 terminals and ground.
      CONNECTOR TERMINAL VOLTAGE REFERENCE

      Connector Terminal Voltage (Approx.)
      M152 19 - Ground Battery voltage
      25 - Ground 0V
      M153 40 - Ground Battery voltage
      44 - Ground 0V
      45 - Ground
      Fig 1: Checking Voltage Between Transfer Control Unit Connector Terminals And Ground
      G04898414
    4. Turn ignition switch "ON". (Do not start engine.)
    5. Check voltage between transfer control unit harness connector terminals and ground.
      CONNECTOR TERMINAL VOLTAGE REFERENCE

      Connector Terminal Voltage (Approx.)
      M152 19 - Ground Battery voltage
      25 - Ground
      M153 40 - Ground
      44 - Ground
      45 - Ground
      Fig 2: Checking Voltage Between Transfer Control Unit Connector Terminals And Ground
      G04898415

    OK or NG 

    OK: GO TO 2.

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

    • 40A fusible link (No. j located in the fuse and fusible link box). Refer to "POWER SUPPLY ROUTING CIRCUIT ".
    • 10A fuses [No. 21 located in the fuse block-junction block (J/B) and 57 and 58 located in the fuse and relay box]. Refer to "POWER SUPPLY ROUTING CIRCUIT ".
    • Harness for short or open between battery and transfer control unit harness connector M152 terminal 19.
    • Harness for short or open between battery and transfer shut off relay 2 harness connector E157 terminal 1 and 3.
    • Harness for short or open between battery and transfer shut off relay 1 harness connector E156 terminal 3.
    • Harness for short or open between ignition switch and transfer control unit harness connector M152 terminal 25.
    • Harness for short or open between ignition switch and transfer shut off relay 1 harness connector E156 terminal 1.
    • Harness for short or open transfer shut off relay 2 harness connector E157 terminal 5 and transfer control unit harness connector M153 terminals 44, 45.
    • Harness for short or open between transfer shut off relay 1 harness connector E156 terminal 5 and transfer control unit harness connector M153 terminals 44, 45.
    • 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.
    • Harness for open between transfer shut off relay 1 harness connector E156 terminal 2 and ground.
    • Battery and ignition switch. Refer to "POWER SUPPLY ROUTING CIRCUIT ".
    • Transfer shut off relay 1, 2. Refer to "COMPONENT INSPECTION ".
  2. CHECK TRANSFER CONTROL UNIT GROUND CIRCUIT 
    1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
    2. Disconnect transfer control unit harness connectors.
    3. Check continuity between transfer control unit harness connector M152 terminals 6, 18, M153 terminal 32 and ground.

      Continuity should exist. 

      Fig 3: Checking Continuity Between Transfer Control Unit Harness Connector M152 Terminals 6, 18, M153 Terminal 32 And Ground
      G04898416

      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.
    • Harness for short or open between transfer shut off relay harness connector E157 terminal 2 and transfer control unit harness connector terminal 40.
  3. CHECK COMBINATION METER POWER SUPPLY CIRCUIT 
    1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
    2. Disconnect combination meter harness connector.
    3. Check voltage between combination meter harness connector terminals and ground.
      CONNECTOR TERMINAL VOLTAGE REFERENCE

      Connector Terminal Voltage (Approx.)
      M24 16 - Ground 0V
      Fig 4: Checking Voltage Between Combination Meter Harness Connector Terminals And Ground
      G04898475
    4. Turn ignition switch "ON". (Do not start engine.)
    5. Check voltage between combination meter harness connector terminals and ground.
      CONNECTOR TERMINAL VOLTAGE REFERENCE

      Connector Terminal Voltage (Approx.)
      M24 16 - Ground Battery voltage
      6. Fig 5: Checking Voltage Between Combination Meter Connector M24 Terminal 16 And Ground
      G04898476

    OK or NG 

    OK: GO TO 4.

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

    • 10A fuse [No. 14, located in the fuse block (J/B) or] ignition switch.
    • Harness for short or open between ignition switch and combination meter harness connector terminal 16
  4. CHECK HARNESS BETWEEN TRANSFER CONTROL UNIT AND COMBINATION METER 
    1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
    2. Check continuity between the following terminals.
      • Transfer control unit harness connector M153 terminal 35 and combination meter harness connector M24 terminal 30.
      • Transfer control unit harness connector M153 terminal 36 and combination meter harness connector M24 terminal 27.
      • Transfer control unit harness connector M153 terminal 37 and combination meter harness connector M24 terminal 29.

        Continuity should exist. 

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

        Fig 6: Checking Continuity Between Transfer Control Unit And Combination Meter Connector Terminals
        G04898477

    OK or NG 

    OK: GO TO 5.

    NG: Repair or replace damaged parts.

  5. CHECK INDICATOR LAMP CIRCUIT 
    1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
    2. Connect combination meter harness connector.
    3. Disconnect transfer control unit harness connector.
    4. Turn ignition switch "ON". (Do not start engine.)
    5. Ground the following terminals using suitable wiring.
      • Transfer control unit harness connector M153 terminal 35 and ground.
      • Transfer control unit harness connector M153 terminal 36 and ground.
      • Transfer control unit harness connector M153 terminal 37 and ground.
        • Fig 7: Checking Continuity Between Transfer Control Unit Connector Terminals And Ground
        G04898478

    Do indicator lamps turn on? 

    OK: GO TO 6.

    NG: Replace the combination meter. Refer to "COMBINATION METER ".

  6. SYMPTOM CHECK 

    Check again.

    OK or NG 

    OK: Inspection End.

    NG: GO TO 7.

  7. 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: Inspection End.

    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.

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