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: 4H and 4LO	ON
      	4WD shift switch: 2WD	OFF

   Without CONSULT 

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

      Connector	Terminal	Condition		Voltage (Approx.)
      M165	17 - Ground	Vehicle stopped Engine running A/T selector lever "N" position Brake pedal depressed	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  5.

      NO: 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 M165 terminal 17 and wait detection switch harness connector F73 terminal 10.

      Continuity should exist  .

      Fig 2: Checking Continuity Between Transfer Control Unit Connector M165 Terminal 17 And Wait Detection Switch Connector F73 Terminal 10

      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. Disconnect wait detection switch harness connector.
   3. Check continuity between wait detection switch harness connector F73 terminal 11 and ground.

      Continuity should exist  .

      Fig 3: Checking Continuity Between Wait Detection Switch Harness Connector F73 Terminal 11 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 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.

      Are the inspection results normal? 

      YES: GO TO 5.

      NO: Replace wait detection switch.

5. CHECK TRANSFER CONTROL UNIT

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

   Are the inspection results normal? 

   YES: GO TO 6.

   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.

6. CHECK DTC

   Drive the vehicle and then perform self-diagnosis.

   Is DTC P1814 displayed? 

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

   NO: Inspection End.