Diagnostic Procedure

With CONSULT-II 

1. Start engine.
2. Select "DATA MONITOR" mode for "ALL MODE AWD/4WD" with CONSULT-II.
Fig 1: CONSULT-II Display - DATA MONITOR
Courtesy of NISSAN MOTOR CO., U.S.A.
3. Read out the value of "ATP SWITCH".
   DISPLAY VALUE CONDITION
   
   

   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-II 

1. Start engine.
2. Check voltage between transfer control unit harness connector terminal and ground.
   Fig 2: Checking Voltage Between Transfer Control Unit Harness Connector Terminal And Ground

   Courtesy of NISSAN MOTOR CO., U.S.A.
   VOLTAGE CONNECTOR TERMINAL REFERENCE
   
   

   Connector	Terminal	Condition		Voltage (Approx.)
   E142	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

OK or NG 

OK: GO TO  5.

NG: GO TO 2.

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 E142 terminal 23 and ATP switch harness connector F55 terminal 8.

   Continuity should exist. 

   Fig 3: Checking Continuity Between Transfer Control Unit Connector E142 Terminal 23 And ATP Switch Connector F55 Terminal 8

   Courtesy of NISSAN MOTOR CO., U.S.A.

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

OK or NG 

OK: GO TO 3.

NG: Repair or replace damaged parts.

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. 

   Fig 4: Checking Continuity Between ATP Switch Harness Connector F55 Terminal 9 And Ground

   Courtesy of NISSAN MOTOR CO., U.S.A.

   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.

1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
2. Remove ATP switch. Refer to "LOCATION OF ELECTRICAL PARTS ".
3. Push and release ATP switch and check continuity between ATP switch terminals 8 and 9.
   Fig 5: Checking Continuity Between ATP Switch Terminals 8 And 9

   Courtesy of NISSAN MOTOR CO., U.S.A.
   CONTINUITY CONNECTOR TERMINAL REFERENCE
   
   

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

OK or NG 

OK: GO TO 5.

NG: Replace ATP switch. Refer to "LOCATION OF ELECTRICAL PARTS ".

Check transfer control unit input/output signal. Refer to "TRANSFER CONTROL UNIT INPUT/OUTPUT SIGNAL REFERENCE VALUES ".

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.

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 ATP warning lamp "ON", while actuator motor is operating? 

YES: Inspection End.

NO: Go to "ATP WARNING LAMP DOES NOT TURN ON ".