Diagnosis Procedure

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

1. CHECK LINE PRESSURE SWITCH SIGNAL 

   With CONSULT 

   1. Start engine.
   2. Select DATA MONITOR mode for ALL MODE AWD/4WD with CONSULT.
   3. Read out ON/OFF switching action of LINE PRES SW while operating 4WD shift switch.

      Condition		Display value
      A/T selector lever D position 4WD shift switch: AUTO		ON
      Except the above The vehicle has been left at room temperature for 5 minutes and more with ignition switch in OFF position.	Ignition switch: ON A/T selector lever: P or N position 4WD shift switch: other than AUTO	OFF

   Without CONSULT 

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

      Connector	Terminal	Condition		Voltage (Approx.)
      E143	35 - Ground	A/T selector lever D position	4WD shift switch: AUTO	0V
      		Except the above The vehicle has been left at room temperature for 5 minutes and more with ignition switch in OFF position.	Ignition switch: ON A/T selector lever: P or N position 4WD shift switch: other than AUTO	Battery voltage

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

      Courtesy of NISSAN NORTH AMERICA, INC.

      Are inspection results normal? 

      YES: GO TO  5.

      NO: GO TO 2.

2. CHECK HARNESS BETWEEN TRANSFER CONTROL UNIT AND LINE PRESSURE SWITCH 
   1. Turn ignition switch OFF. (Stay for at least 5 seconds.)
   2. Disconnect transfer control unit harness connector and the transfer terminal cord assembly harness connector.
   3. Check continuity between transfer control unit harness connector E143 terminal 35 and transfer terminal cord assembly harness connector F56 terminal 1.

      Continuity should exist. 

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

      Are inspection results normal? 

      YES: GO TO 3.

      NO: Repair or replace damaged parts.

      Fig 2: Checking Harness Between Transfer Control Unit And Line Pressure Switch

      Courtesy of NISSAN NORTH AMERICA, INC.
3. CHECK TRANSFER CONTROL UNIT 

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

   Are inspection results normal? 

   YES: GO TO 4.

   NO: Check the following. If any items are damaged, repair or replace damaged parts.

   • Transfer control unit pin terminals for damage or loose connection with harness connector.
   • Transfer control unit. Refer to "REMOVAL AND INSTALLATION ".
4. CHECK LINE PRESSURE SWITCH 
   1. Turn ignition switch OFF. (Stay for at least 5 seconds.)
   2. Remove line pressure switch. Refer to "COMPONENT PARTS LOCATION ".
   3. Push and release line pressure switch and check continuity between terminal 1 and ground.

      Terminal	Condition	Continuity
      1 - Ground	Push line pressure switch	Yes
      	Release line pressure switch	No

      Are inspection results normal? 

      YES: GO TO 5.

      NO: Replace line pressure switch.

5. CHECK DTC 

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

   Are inspection results normal? 

   YES: GO TO 6.

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

6. CRUISE TEST 

   Perform cruise test. Refer to "PRELIMINARY CHECK ".

   Are inspection results normal? 

   YES: Inspection End.

   NO: Perform the applicable trouble diagnosis.