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 SW SIG".
   MONITOR ITEM DISPLAY VALUE REFERENCE
   
   

   Monitor item	Condition		Display value
   D-LOCK SW SIG	Vehicle stopped Engine running	Differential lock mode switch: ON	ON
   		Differential lock mode switch: OFF	OFF

   Fig 1: Display D-Lock SW Sig On Data Monitor Mode

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

Without CONSULT-II 

1. Turn ignition switch ON.
2. Check voltage between differential lock control unit harness connector terminals and ground.
   DIFFERENTIAL LOCK CONTROL UNIT HARNESS CONNECTOR TERMINALS AND GROUND VOLTAGE SPECIFICATIONS
   
   

   Connector	Terminal	Condition		Voltage (Approx.)
   M70	9 - Ground	Ignition switch: ON	Differential lock mode switch: ON	Battery voltage
   			Differential lock mode switch: OFF	0V
   	22 - Ground		Differential lock mode switch: ON	0V
   			Differential lock mode switch: OFF	Battery voltage

OK or NG 

• OK: GO TO  5.
• NG: GO TO 2.
  Fig 2: Checking Voltage Between Differential Lock Control Unit Harness Connector Terminals And Ground

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

1. Turn ignition switch ON.
2. Disconnect differential lock mode switch harness connector.
3. Check voltage between differential lock mode switch harness connector terminal 3 and ground.
   DIFFERENTIAL LOCK MODE SWITCH HARNESS CONNECTOR TERMINAL 3 AND GROUND VOLTAGE SPECIFICATIONS
   
   

   Connector	Terminal	Voltage (Approx.)
   M149	3 - Ground	Battery voltage

   Fig 3: Checking Voltage Between Differential Lock Mode Switch Harness Connector Terminal 3 And Ground

   Courtesy of NISSAN MOTOR CO., U.S.A.
4. Turn ignition switch OFF.
5. Check voltage between differential lock mode switch harness connector terminal 3 and ground.
   DIFFERENTIAL LOCK MODE SWITCH HARNESS CONNECTOR TERMINAL 3 AND GROUND VOLTAGE SPECIFICATIONS
   
   

   Connector	Terminal	Voltage (Approx.)
   M149	3 - Ground	0V

   Fig 4: Checking Voltage Between Differential Lock Mode Switch Harness Connector Terminal 3 And Ground

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

OK or NG 

• OK: GO TO 3.
• NG: Check the following. If any items are damaged, repair or replace damaged parts.
  • 10A fuse [No. 3, located in fuse block (J/B)]
  • Harness for short or open between ignition switch and differential lock mode switch harness connector terminal 3
  • Ignition switch. Refer to "POWER SUPPLY ROUTING CIRCUIT ".

1. Turn ignition switch OFF.
2. Operate differential lock mode switch and check continuity between differential lock mode switch terminals.
   DIFFERENTIAL LOCK MODE SWITCH TERMINALS CONTINUITY CONDITIONS
   
   

   Terminal	Condition	Continuity
   1 - 3	Differential lock mode switch: ON	No
   	Differential lock mode switch: OFF	Yes
   2 - 3	Differential lock mode switch: ON	Yes
   	Differential lock mode switch: OFF	No

   Fig 5: Checking Continuity Between Differential Lock Mode Switch Terminals

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

OK or NG 

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

1. Disconnect differential lock control unit harness connector.
2. Check continuity between the following terminals.
   • Differential lock control unit harness connector M70 terminal 9 and differential lock mode switch harness connector M149 terminal 2.
   • Differential lock control unit harness connector M70 terminal 22 and differential lock mode switch harness connector M149 terminal 1.

     Continuity should exist. 

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

     Fig 6: Checking Continuity Between Differential Lock Control Unit And Differential Lock Mode Switch Terminals

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

OK or NG 

• OK: GO TO 5.
• NG: Repair or replace damaged parts.

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 ".