Diagnosis Procedure

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

1. CHECK ATP 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 "ATP SWITCH".

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

   Without CONSULT 

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

      Connector	Terminal	Condition		Voltage (Approx.)
      M165	23 - Ground	Vehicle stopped Engine running A/T selector lever "N" position Brake pedal depressed	4WD shift switch: 4H to 4LO or 4LO to 4H (While actuator motor is operating.)	0V
      			Except the above	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 ATP SWITCH
   1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
   2. Disconnect transfer control unit harness connector and the ATP switch harness connector.
   3. Check continuity between transfer control unit harness connector M165 terminal 23 and ATP switch harness connector F71 terminal 8.

      Continuity should exist  .

      Fig 2: Checking Continuity Between Transfer Control Unit Connector M165 Terminal 23 And ATP Switch Connector F71 Terminal 8

      Courtesy of NISSAN NORTH AMERICA, INC.

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

      Does continuity exist? 

      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 ATP switch harness connector.
   3. Check continuity between ATP switch harness connector F71 terminal 9 and ground.

      Continuity should exist  .

      Fig 3: Checking Continuity Between ATP Switch Connector F71 Terminal 9 And Ground

      Courtesy of NISSAN NORTH AMERICA, INC.

      Also check harness for short to power.

      Does continuity exist? 

      YES: GO TO 4.

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

4. CHECK ATP SWITCH
   1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
   2. Remove ATP switch. Refer to "COMPONENT PARTS LOCATION ".
   3. Push and release ATP switch and check continuity between ATP switch terminals 8 and 9.

      Terminal	Condition	Continuity
      8 - 9	Push ATP switch	Yes
      	Release ATP switch	No

      Fig 4: Checking Continuity Between ATP Switch Terminals 8 And 9

      Courtesy of NISSAN NORTH AMERICA, INC.

      Are the inspection results normal? 

      YES: GO TO 5.

      NO: Replace ATP 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 ATP WARNING LAMP
   1. Turn ignition switch "ON". (Do not start engine.)
   2. A/T selector lever "N" position and engage the parking brake.
   3. Switch 4WD shift switch from 4H to 4LO or 4LO to 4H.

      Does the ATP warning lamp turn ON while the actuator motor is operating? 

      YES: Inspection End.

      NO: Refer to "DIAGNOSIS PROCEDURE ".