Diagnosis Procedure

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

1. CHECK ACTUATOR POSITION SWITCH SIGNAL

   With CONSULT 

   1. Start engine.
   2. Depress brake pedal and stop vehicle.
   3. Set A/T selector lever to "N" position.
   4. Select "DATA MONITOR" mode for "ALL MODE AWD/4WD" with CONSULT.
   5. Read out the value of "SHIFT POS SW1", "SHIFT POS SW2", "SHIFT POS SW3", "SHIFT POS SW4".

      Monitored item	Condition	Display value
      SHIFT POS SW1	4WD shift switch: 2WD and 4LO	ON
      	4WD shift switch: 4H	OFF
      SHIFT POS SW2	4WD shift switch: 4LO	ON
      	4WD shift switch: 2WD and 4H	OFF
      SHIFT POS SW3	4WD shift switch: 2WD and 4H	ON
      	4WD shift switch: 4LO	OFF
      SHIFT POS SW4	4WD shift switch: 4H and 4LO	ON
      	4WD shift switch: 2WD	OFF

   Without CONSULT 

   1. Start engine.
   2. Depress brake pedal and stop vehicle.
   3. Set A/T selector lever to "N" position.
   4. Check voltage between transfer control unit harness connector terminal and ground.

      Connector	Terminal	Condition	Voltage (Approx.)
      M165	10 - Ground	4WD shift switch: 2WD and 4LO	0V
      		4WD shift switch: 4H	Battery voltage
      	11 - Ground	4WD shift switch: 4LO	0V
      		4WD shift switch: 2WD and 4H	Battery voltage
      	12 - Ground	4WD shift switch: 2WD and 4H	0V
      		4WD shift switch: 4LO	Battery voltage
      	13 - Ground	4WD shift switch: 4H and 4LO	0V
      		4WD shift switch: 2WD	Battery voltage

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

      Courtesy of NISSAN NORTH AMERICA, INC.

      Are the inspection results normal? 

      YES: GO TO  4.

      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 M165 terminal 10 and transfer control device (actuator position switch) harness connector F72 terminal 26.
      • Transfer control unit harness connector M165 terminal 11 and transfer control device (actuator position switch) harness connector F72 terminal 20.
      • Transfer control unit harness connector M165 terminal 12 and transfer control device (actuator position switch) harness connector F72 terminal 21.
      • Transfer control unit harness connector M165 terminal 13 and transfer control device (actuator position switch) harness connector F72 terminal 25.

      Continuity should exist  .

      Fig 2: Checking Continuity Between Transfer Control Unit And Transfer Control Device (Actuator Position Switch) Connector Terminals

      Courtesy of NISSAN NORTH AMERICA, INC.

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

      Is there continuity? 

      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. Check continuity between transfer control device (actuator position switch) harness connector F72 terminal 22 and ground.

      Continuity should exist  .

      Fig 3: Checking Continuity Between Transfer Control Device (Actuator Position Switch) Connector F72 Terminal 22 And Ground

      Courtesy of NISSAN NORTH AMERICA, INC.

      Also check harness for short to power.

      Is there continuity?

      YES: GO TO 4  .

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

4. CHECK TRANSFER CONTROL UNIT

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

   Are the inspection results normal? 

   YES: GO TO 5.

   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.

5. CHECK DTC

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

   Is DTC P1818 displayed? 

   YES: Replace transfer control device. Refer to "REMOVAL AND INSTALLATION ".

   NO: Inspection End.