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 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.)
      E143	40 - Ground	Vehicle stopped Engine running A/T selector lever N 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 Harness Connector Terminal 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 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 E143 terminal 40 and ATP switch harness connector F55 terminal 8.

      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 Continuity Between Transfer Control Unit Harness Connector E143 Terminal 40 And ATP Switch Harness Connector F55 Terminal 8

      Courtesy of NISSAN NORTH AMERICA, INC.
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 F55 terminal 9 and ground.

      Continuity should exist. 

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

      Are inspection results normal? 

      YES: GO TO 4.

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

      Fig 3: Checking Continuity Between ATP Switch Harness Connector F55 Terminal 9 And Ground

      Courtesy of NISSAN NORTH AMERICA, INC.
4. CHECK ATP SWITCH 
   1. Turn ignition switch OFF. (Stay for at least 5 seconds.)
   2. Disconnect ATP switch harness connector.
   3. Remove ATP switch. Refer to "COMPONENT PARTS LOCATION ".
   4. 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 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 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. Move A/T selector lever to P position.
   3. Set 4WD shift switch from 4H to 4LO or 4LO to 4H.

      Does ATP warning lamp turn ON while switching? 

      YES: Inspection End.

      NO: GO TO "DIAGNOSIS PROCEDURE ".