Diagnosis Procedure

Regarding Wiring Diagram information, refer to "WIRING DIAGRAM ".

1. CHECK ACTUATOR POSITION SWITCH SIGNAL 

   With CONSULT 

   1. Start engine.
   2. Select DATA MONITOR mode for ALL MODE AWD/4WD with CONSULT.
   3. Read out the value of SHIFT POS SW1 and SHIFT POS SW2.

      Monitored item	Condition		Display value
      SHIFT POS SW1	Vehicle stopped Engine running A/T selector lever N position Brake pedal depressed	4WD shift switch: 4LO	ON
      		4WD shift switch: 2WD, AUTO or 4H	OFF
      SHIFT POS SW2	Vehicle stopped Engine running A/T selector lever N position Brake pedal depressed	4WD shift switch: 4H, AUTO or 2WD	ON
      		4WD shift switch: 4LO	OFF

   Without CONSULT 

   1. Start engine.
   2. Check voltage between transfer control unit harness connector terminal and ground.

      Connector	Terminal	Condition		Voltage (Approx.)
      E143	27 - Ground	Vehicle stopped Engine running A/T selector lever N position Brake pedal depressed	4WD shift switch: 4H, AUTO or 2WD	0V
      			4WD shift switch: 4LO	Battery voltage
      	44 - Ground	Vehicle stopped Engine running A/T selector lever N position Brake pedal depressed	4WD shift switch: 4LO	0V
      			4WD shift switch: 2WD, AUTO or 4H	Battery voltage

      Fig 1: Checking Voltage Between Transfer Control Unit Harness Connector Terminal And Ground

      Courtesy of NISSAN NORTH AMERICA, INC.

      Are the inspection results normal? 

      YES: GO TO  5.

      NO: GO TO 2.

2. CHECK HARNESS BETWEEN TRANSFER CONTROL UNIT AND ACTUATOR POSITION SWITCH 
   1. Turn ignition switch OFF. (Stay for at least 5 seconds.)
   2. Disconnect transfer control unit harness connector and the transfer control device (actuator position switch) harness connector.
   3. Check continuity between the following terminals.
      • Transfer control unit harness connector E143 terminal 27 and transfer control device (actuator position switch) harness connector F58 terminal 23.
      • Transfer control unit harness connector E143 terminal 44 and transfer control device (actuator position switch) harness connector F58 terminal 20.

        Continuity should exist. 

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

      Fig 2: Checking Harness Between Transfer Control Unit And Actuator Position Switch

      Courtesy of NISSAN NORTH AMERICA, INC.

      Are the inspection results normal? 

      YES: GO TO 3.

      NO: Repair or replace damaged parts.

3. CHECK GROUND CIRCUIT 
   1. Turn ignition switch OFF. (Stay for at least 5 seconds.)
   2. Disconnect transfer control device (actuator position switch) harness connector.
   3. Check continuity between transfer control device (actuator position switch) harness connector F58 terminal 22 and ground.

      Continuity should exist. 

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

      Are the inspection results normal? 

      YES: GO TO 4.

      NO: Repair open circuit or short to ground or short to power in harness or connectors.

      Fig 3: Checking Continuity Between Transfer Control Device (Actuator Position Switch) Harness Connector F58 Terminal 22 And Ground

      Courtesy of NISSAN NORTH AMERICA, INC.
4. CHECK ACTUATOR POSITION SWITCH 
   1. Remove transfer control device. Refer to "REMOVAL AND INSTALLATION ".
   2. Check operation by applying battery voltage to transfer control device (actuator motor) terminals 21 and 24.
      CAUTION:

      • Do not operate actuator motor for more than 1 second.
      • Change the actuator motor position to HIGH when installing.
      • Be careful not to overheat the harness.

      Terminal	Continuity	Continuity
      24 (Battery voltage) - 21 (Ground)	20 - 22	Yes
      	22 - 23	No
      21 (Battery voltage) - 24 (Ground)	22 - 23	Yes
      	20 - 22	No

      Fig 4: Applying Battery Voltage To Transfer Control Device (Actuator Motor) Terminals 21 And 24

      Courtesy of NISSAN NORTH AMERICA, INC.

      Are the inspection results normal? 

      YES: GO TO 5.

      NO: Replace transfer control device (actuator motor).

5. CHECK TRANSFER CONTROL UNIT 

   Check transfer control unit input/output signal. Refer to "REFERENCE VALUE ".

   Are the inspection results normal? 

   YES: GO TO 6.

   NO: 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.

   Are the inspection results normal? 

   YES: Inspection End.

   NO: Replace transfer control unit. Refer to "REMOVAL AND INSTALLATION ".