Diagnosis Procedure

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

1. CHECK TRANSFER FLUID TEMPERATURE SENSOR SIGNAL 

   With CONSULT 

   1. Start engine.
   2. Select DATA MONITOR mode for ALL MODE AWD/4WD with CONSULT.
   3. Read out the value of FLUID TEMP SE.

      Condition	Display value (Approx.)
      Transfer fluid temperature approx. 20 - 80°C (68 - 176°F)	1.1 - 0.3V

   Without CONSULT 

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

      Connector	Terminal	Condition		Data (Approx.)
      E143	28 - Ground	Always		0V
      	31 - Ground	Ignition switch: ON	Transfer fluid temperature approx. 20°C (68°F)	1.1V
      			Transfer fluid temperature approx. 80°C (176°F)	0.3V

      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  4.

      NO: GO TO 2.

2. CHECK HARNESS BETWEEN TRANSFER CONTROL UNIT AND TRANSFER TERMINAL CORD ASSEMBLY 
   1. Turn ignition switch OFF. (Stay for at least 5 seconds.)
   2. Disconnect transfer control unit harness connector and transfer terminal cord assembly harness connector.
   3. Check continuity between the following terminals.
      • Transfer control unit harness connector E143 terminal 28 and transfer terminal cord assembly harness connector F56 terminal 3.
      • Transfer control unit harness connector E143 terminal 31 and transfer terminal cord assembly harness connector F56 terminal 2.

        Continuity should exist. 

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

      Fig 2: Checking Harness Between Transfer Control Unit And Transfer Terminal Cord Assembly

      Courtesy of NISSAN NORTH AMERICA, INC.

      Are inspection results normal? 

      YES: GO TO 3.

      NO: Repair or replace damaged parts.

3. CHECK TRANSFER FLUID TEMPERATURE SENSOR 
   1. Turn ignition switch OFF. (Stay for at least 5 seconds.)
   2. Disconnect transfer terminal cord assembly harness connector.
   3. Check resistance between transfer terminal cord assembly terminals 2 and 3.

      Temperature °C (°F)	Resistance (Approx.)
      20 (68)	2.5 kΩ
      80 (176)	0.3 kΩ

      Fig 3: Checking Resistance Between Transfer Terminal Cord Assembly Terminals 2 And 3

      Courtesy of NISSAN NORTH AMERICA, INC.

      Are inspection results normal? 

      YES: GO TO 4.

      NO: Replace transfer fluid temperature sensor. Refer to "COMPONENT PARTS LOCATION ".

4. CHECK TRANSFER CONTROL UNIT 

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

   Are 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 

   Drive the vehicle and then perform self-diagnosis.

   Are inspection results normal? 

   YES: Inspection End.

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