Diagnosis Procedure

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

1. CHECK WAIT DETECTION 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 "WAIT DETCT SW".

      Condition		Display value
      Vehicle stopped Engine running A/T selector lever "N" position Brake pedal depressed	4WD shift switch: 2WD, AUTO or 4H	OFF
      	4WD shift switch: 4H to 4LO (While actuator motor is operating.)	OFF → ON
      	4WD shift switch: 4LO to 4H (While actuator motor is operating.)	ON → OFF
      	4WD shift switch: 4LO	ON

   Without CONSULT 

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

      Connector	Terminal	Condition		Voltage (Approx.)
      M153	43 - Ground	Vehicle stopped Engine running A/T selector lever "N" position Brake pedal depressed	4WD shift switch: 2WD, AUTO or 4H	Battery voltage
      			4WD shift switch: 4H to 4LO (While actuator motor is operating.)	Battery voltage → 0V
      			4WD shift switch: 4LO to 4H (While actuator motor is operating.)	0V → Battery voltage
      			4WD shift switch: 4LO	0V

      Fig 1: Checking Voltage Between Transfer Control Unit Harness Connector Terminal 43 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 WAIT DETECTION SWITCH
   1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
   2. Disconnect transfer control unit harness connector and the wait detection switch harness connector.
   3. Check continuity between transfer control unit harness connector M153 terminal 43 and wait detection switch harness connector F59 terminal 10.

      Continuity should exist  .

      Fig 2: Checking Continuity Between Transfer Control Unit Connector Terminal 43 And Wait Detection Switch Connector Terminal 10

      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 wait detection switch harness connector.
   3. Check continuity between wait detection switch harness connector F59 terminal 11 and ground.

      Continuity should exist  .

      Fig 3: Checking Continuity Between Wait Detection Switch Harness Connector F59 Terminal 11 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 WAIT DETECTION SWITCH
   1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
   2. Disconnect wait detection switch harness connector.
   3. Remove wait detection switch. Refer to "COMPONENT PARTS LOCATION ".
   4. Push and release wait detection switch and check continuity between wait detection switch terminals 10 and 11.

      Terminal	Condition	Continuity
      10 - 11	Push wait detection switch	Yes
      	Release wait detection switch	No

      Fig 4: Checking Continuity Between Wait Detection Switch Terminals 10 And 11

      Courtesy of NISSAN NORTH AMERICA, INC.

      OK or NG 

      OK: GO TO 5.

      NG: Replace wait detection switch.

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 unit. Refer to "REMOVAL AND INSTALLATION ".