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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 System >> 4LO Switch >> 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 4LO POSITION SWITCH SIGNAL 

    With CONSULT-II 

    1. Start engine.
    2. Select "DATA MONITOR" mode for "ALL MODE AWD/4WD" with CONSULT-II.
    3. Read out the value of "4L POSI SW".
      DISPLAY VALUE CONDITION

      Condition Display value
      • Vehicle stopped
      • Engine running
      • A/T selector lever "N" position
      • Brake pedal depressed
      		 4WD shift switch: 4LO ON
      Except the above OFF
      Fig 1: Identifying CONSULT II - DATA MONITOR Screen
      G04898418

      Without CONSULT-II 

    1. Start engine.
    2. Check voltage between transfer control unit harness connector terminal and ground.
      CONNECTOR TERMINAL VOLTAGE REFERENCE

      Connector Terminal Condition Voltage (Approx.)
      E142 24 - Ground
      • Vehicle stopped
      • Engine running
      • A/T selector lever "N" position
      • Brake pedal depressed
      		 4WD shift switch: 4LO 0V
      Except the above Battery voltage
      Fig 2: Checking Voltage Between Transfer Control Unit Connector Terminal And Ground
      G04898419

    OK or NG 

    OK: GO TO  5.

    NG: GO TO 2.

  2. CHECK HARNESS BETWEEN TRANSFER CONTROL UNIT AND 4LO SWITCH 
    1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
    2. Disconnect transfer control unit harness connector and the 4LO switch harness connector.
    3. Check continuity between transfer control unit harness connector M152 terminal 24 and 4LO switch harness connector F60 terminal 13.

      Continuity should exist. 

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

      Fig 3: Checking Continuity Between Transfer Control Unit Connector M152 Terminal 24 And 4Lo Switch Connector F60 Terminal 13
      G04898420

    OK or NG 

    OK: GO TO 3.

    NG: Repair or replace damaged parts.

  3. CHECK GROUND CIRCUIT 
    1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
    2. Disconnect 4LO switch harness connector.
    3. Check continuity between 4LO switch harness connector F60 terminal 12 and ground.

      Continuity should exist. 

      Also check harness for short to power.

      Fig 4: Checking Continuity Between 4LO Switch Connector F60 Terminal 12 And Ground
      G04898421

    OK or NG 

    OK: GO TO 4.

    NG: Repair open circuit or short to power in harness or connectors.

  4. CHECK 4LO SWITCH 
    1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
    2. Disconnect 4LO switch harness connector.
    3. Remove 4LO switch. Refer to "LOCATION OF ELECTRICAL PARTS ".
    4. Push and release 4LO switch and check continuity between 4LO switch terminals 12 and 13.
      CONNECTOR TERMINAL CONTINUITY REFERENCE

      Terminal Condition Continuity
      12 - 13 Push 4LO switch Yes
      Release 4LO switch No
      5. Fig 5: Checking Continuity Between 4LO Switch Terminals 12 And 13
      G04910416

    OK or NG 

    OK: GO TO 5.

    NG: Replace 4LO switch. Refer to "LOCATION OF ELECTRICAL PARTS ".

  5. 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: 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.

  6. CHECK DTC 

    Perform the self-diagnosis, after driving a vehicle for a while.

    OK or NG 

    OK: Inspection End.

    NG: Replace transfer control unit. Refer to "REMOVAL AND INSTALLATION ".

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