Diagnostic Procedure

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".
   VEHICLE SPEED CONDITION
   
   

   Condition		Display value
   Vehicle stopped Engine running For A/T models, A/T selector lever "N" position with brake pedal depressed. For M/T models, M/T shift lever neutral position with clutch and brake pedal depressed.	4WD shift switch: 4LO	ON
   	Except the above	OFF

   Fig 1: CONSULT-II Display - "ALL MODE AWD/4WD"

   Courtesy 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.
   CONNECTOR TERMINAL VOLTAGE SPECIFICATION
   
   

   Connector	Terminal	Condition		Voltage (Approx.)
   M152	24 - Ground	Vehicle stopped Engine running For A/T models, A/T selector lever "N" position with brake pedal depressed. For M/T models, M/T shift lever neutral position with clutch and brake pedal depressed.	4WD shift switch: 4LO	0V
   			Except the above	Battery voltage

OK or NG 

1. OK: GO TO  5.
2. NG: GO TO 2.
   Fig 2: Checking Voltage Between Transfer Control Unit Harness Connector Terminal Ground

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

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.

OK or NG 

1. OK: GO TO 3.
2. NG: Repair or replace damaged parts.
   Fig 3: Checking Continuity Between Transfer Control Unit Harness Connector M152 Terminal 24 And 4LO Switch Harness Connector F60 Terminal 13

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

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.

OK or NG 

1. OK: GO TO 4.
2. NG: Repair open circuit or short to power in harness or connectors.
   Fig 4: Checking Continuity Between 4LO Switch Harness Connector F60 Terminal 12 Ground

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

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 SPECIFICATION
   
   

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

OK or NG 

1. OK: GO TO 5.
2. NG: Replace 4LO switch. Refer to , "LOCATION OF ELECTRICAL PARTS ".
   Fig 5: Checking Continuity Between 4LO Switch Terminals 12 And 13

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

Check transfer control unit input/output signal. Refer to , "TRANSFER CONTROL UNIT INPUT/OUTPUT SIGNAL REFERENCE VALUES ".

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.

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 ".