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Home >> Infiniti >> 2004 >> QX56 RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1208 (Transfer Case) >> Trouble Diagnosis For System >> Neutral-4LO Switch >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2005 Infiniti QX56. 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 "N POSI SW TF".
      Fig 1: Checking 4LO Position Switch Signal Reference
      G02382980Courtesy of NISSAN MOTOR CO., U.S.A.
      Fig 2: Identifying "N POSI SW TF"
      G02382981Courtesy 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.
      Fig 3: Transfer Control Unit Harness Connector Terminal And Ground Voltage Specifications
      G02382982Courtesy of NISSAN MOTOR CO., U.S.A.
      Fig 4: Checking Voltage Between Transfer Control Unit Harness Connector Terminal And Ground
      G02382983Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK: GO TO 5.
    2. 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 (V) and neutral-4LO switch harness connector F60 terminal 13 (V).
      1. Continuity should exist. 

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

    OK or NG 

    1. OK: GO TO 3.
    2. NG: Repair or replace damaged parts.
    Fig 5: Checking Continuity Between Transfer Control Unit Harness Connector E143 Terminal 25 And Neutral-4LO Switch Harness Connector F60 Terminal 13
    G02382984Courtesy 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 (B) and ground.
      1. Continuity should exist. 

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

    OK or NG 

    1. OK: GO TO 4.
    2. NG: Repair open circuit or short to ground or short to power in harness or connectors.
    Fig 6: Checking Continuity Between Neutral-4LO Switch Harness Connector F60 Terminal 12 (B) And Ground
    G02382985Courtesy 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. Refer to "LOCATION OF ELECTRICAL PARTS ".
    4. Push and release neutral-4LO switch and check continuity between neutral-4LO switch terminals 12 and 13.
      Fig 7: Neutral-4LO Switch Terminals 12 And 13 Continuity Specifications
      G02382986Courtesy of NISSAN MOTOR CO., U.S.A.
      Fig 8: Checking Continuity Between Neutral-4LO Switch Terminals 12 And 13
      G02382987Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK: GO TO 5.
    2. NG: Replace neutral-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 TERMINALS AND REFERENCE VALUE ".

    OK or NG 

    1. OK: GO TO 6.
    2. 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 

    1. OK: Inspection End.
    2. NG: Replace transfer control unit. Refer to "REMOVAL AND INSTALLATION ".
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