Diagnostic Procedure

With CONSULT-II 

1. Start engine.
2. Select "DATA MONITOR" mode for "DIFF LOCK" with CONSULT-II.
3. Read out ON/OFF switching action of "D-LOCK POS SW SIG".
   MONITOR ITEM DISPLAY VALUES
   
   

   Monitor item	Condition		Display value
   D-LOCK POS SW SIG	Vehicle stopped Engine running VDC OFF switch (if equipped): ON 4WD shift switch: 4LO	Differential lock mode switch: ON (DIFF LOCK indicator lamp: ON)	ON
   		Differential lock mode switch: OFF (DIFF LOCK indicator lamp: OFF)	OFF

   Fig 1: Display DATA MONITOR Mode

   Courtesy of NISSAN MOTOR CO., U.S.A.

Without CONSULT-II 

1. Start engine.
2. Check voltage between differential lock control unit harness connector terminal and ground.
   DIFFERENTIAL LOCK CONTROL UNIT HARNESS CONNECTOR TERMINAL AND GROUND VOLTAGE SPECIFICATIONS
   
   

   Connector	Terminal	Condition		Voltage (Approx.)
   M70	20 - Ground	Vehicle stopped Engine running VDC OFF switch (if equipped): ON 4WD shift switch: 4LO	Differential lock mode switch: ON (DIFF LOCK indicator lamp: ON)	0V
   			Differential lock mode switch: OFF (DIFF LOCK indicator lamp: OFF)	Battery voltage

   Fig 2: Checking Voltage Between Differential Lock Control Unit Harness Connector Terminal And Ground

   Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG 

• OK: GO TO  5.
• NG: GO TO 2.

1. Turn ignition switch OFF.
2. Disconnect differential lock position switch harness connector.
3. Check continuity between differential lock position switch harness connector C116 terminal 1 and ground.

   Continuity should exist. 

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

OK or NG 

• OK: GO TO 3.
• NG: Repair open circuit or short to ground or short to power in harness or connectors.
  Fig 3: Checking Continuity Between Differential Lock Position Switch Harness Connector C116 Terminal 1 And Ground

  Courtesy of NISSAN MOTOR CO., U.S.A.

1. Remove differential lock position switch. Refer to "COMPONENTS ".
2. Pull differential lock position switch and check continuity between differential lock position switch terminals.
   DIFFERENTIAL LOCK POSITION SWITCH TERMINALS CONTINUITY CONDITIONS
   
   

   Terminal	Condition	Continuity
   1 - 3	Pull differential position switch	Yes
   	Release Differential position switch	No

   Fig 4: Checking Continuity Between Differential Lock Position Switch Terminals

   Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG 

• OK: GO TO 4.
• NG: Replace differential lock position switch.

1. Turn ignition switch OFF.
2. Disconnect differential lock control unit harness connector.
3. Check continuity between differential lock control unit harness connector M70 terminal 20 and differential lock position switch harness connector C116 terminal 3.

   Continuity should exist. 

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

OK or NG 

• OK: GO TO 5.
• NG: Repair or replace damaged parts.
  Fig 5: Checking Continuity Between Differential Lock Control Unit Harness Connector Terminals

  Courtesy of NISSAN MOTOR CO., U.S.A.

Check differential lock control unit input/output signal. Refer to "DIFFERENTIAL LOCK CONTROL UNIT INPUT/OUTPUT SIGNAL REFERENCE VALUES ".

OK or NG 

• OK: GO TO 6.
• NG: Check differential lock control unit pin terminals for damage or loose connection with harness connector. If any items are damaged, repair or replace damaged parts.

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

OK or NG 

• OK: Inspection End.
• NG: Replace differential lock control unit. Refer to "DIFFERENTIAL LOCK CONTROL UNIT ".