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.)
      M153	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 27, 44 And Ground

      Courtesy of NISSAN NORTH AMERICA, INC.

      OK or NG 

      OK: GO TO  5.

      NG: 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 M153 terminal 27 and transfer control device (actuator position switch) harness connector F58 terminal 23.
      • Transfer control unit harness connector M153 terminal 44 and transfer control device (actuator position switch) harness connector F58 terminal 20.

        Continuity should exist  .

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

        Courtesy of NISSAN NORTH AMERICA, INC.

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

      OK or NG 

      OK: GO TO 3.

      NG: 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  .

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

      Courtesy of NISSAN NORTH AMERICA, INC.

      Also check harness for short to power.

      OK or NG 

      OK: GO TO 4.

      NG: Repair open circuit or short to power in harness or connectors.

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.

      OK or NG 

      YES: GO TO 5.

      NO: Replace transfer control device.

5. CHECK TRANSFER CONTROL UNIT

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

   OK or NG 

   OK: GO TO 6.

   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 

   OK: Inspection End.

   NG: Replace transfer control device.