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Home >> Nissan-Datsun >> 2006 >> Armada SE, 4WD >> Repair and Diagnosis >> Engine Performance >> System >> Transfer Case >> Trouble Diagnosis For System >> Neutral-4LO Switch >> Diagnostic Procedure

Diagnostic Procedure

  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 "N POSI SW TF".
    DISPLAY VALUE CONDITION

    Condition Display value
    • Vehicle stopped
    • Engine running
    • A/T selector lever "N" position
    • Brake pedal depressed
    		 4WD shift switch: 2WD, AUTO or 4H OFF
    4WD shift switch: 4H to 4LO (While actuator motor is operating.) OFF --> ON
    4WD shift switch: 4LO to 4H (While actuator motor is operating.) ON --> OFF
    4WD shift switch: 4LO ON
    Fig 1: CONSULT-II Display - DATA MONITOR
    G04210888Courtesy of NISSAN MOTOR CO., U.S.A.

    Without CONSULT-II 

    1. Start engine.
    2. Check voltage between transfer control unit harness connector terminal and ground.
    WIRE COLOR AND TERMINAL DESCRIPTION

    Connector Terminal (Wire color) Condition Voltage (Approx.)
    E143 25 - Ground
    • Vehicle stopped
    • Engine running
    • A/T selector lever "N" position
    • Brake pedal depressed
    		 4WD shift switch: 2WD, AUTO or 4H Battery voltage
    4WD shift switch: 4H to 4LO (While actuator motor is operating.) Battery voltage --> 0V
    4WD shift switch: 4LO to 4H (While actuator motor is operating.) 0V --> Battery voltage
    4WD shift switch: 4LO 0V
    Fig 2: Checking Voltage Between Transfer Control Unit Harness Connector Terminal And Ground
    G04210889Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: GO TO 5.

    NG: GO TO 2.

  2. CHECK HARNESS BETWEEN TRANSFER CONTROL UNIT AND NEUTRAL-4LO SWITCH 
    1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
    2. Disconnect transfer control unit harness connector and the neutral-4LO switch harness connector.
    3. Check continuity between transfer control unit harness connector E143 terminal 25 and neutral-4LO switch harness connector F60 terminal 13.

      Continuity should exist  .

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

    OK or NG 

    OK: GO TO 3.

    NG: Repair or replace damaged parts.

    Fig 3: Checking Continuity Between Transfer Control Unit Terminal 25 And Neutral-4Lo Switch Terminal 13
    G04210890Courtesy of NISSAN MOTOR CO., U.S.A.
  3. CHECK GROUND CIRCUIT 
    1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
    2. Disconnect neutral-4LO switch harness connector.
    3. Check continuity between neutral-4LO switch harness connector F60 terminal 12 and ground.

      Continuity should exist  .

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

    OK or NG 

    OK: GO TO 4.

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

    Fig 4: Checking Continuity Between Neutral-4Lo Switch Harness Connector F60 Terminal 12 And Ground
    G04210891Courtesy of NISSAN MOTOR CO., U.S.A.
  4. CHECK 4LO SWITCH 
    1. Turn ignition switch "OFF".
    2. Disconnect neutral-4LO switch harness connector.
    3. Remove neutral-4LO switch.
    4. Push and release neutral-4LO switch and check continuity between neutral-4LO switch terminals 12 and 13.
    TERMINAL CONTINUITY REFERENCE

    Terminal Condition Continuity
    12 - 13 Push neutral-4LO switch Yes
    Release neutral-4LO switch No

    OK or NG 

    OK: GO TO 5.

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

    Fig 5: Checking Continuity Between Neutral-4Lo Switch Terminals 12 And 13
    G04210892Courtesy of NISSAN MOTOR CO., U.S.A.
  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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