Diagnostic Procedure

Perform self-diagnosis. Refer to "SELF-DIAGNOSTIC PROCEDURE ".

Is the "4WD MOD SW [P1814]" (with CONSULT-II) or "Flickering pattern: 16 (without CONSULT-II) detected"? 

1. YES: Perform trouble diagnosis for 4WD shift switch. Refer to "4WD SHIFT SWITCH ".
2. NO: GO TO 2.

With CONSULT-II 

1. Start engine.
2. Select "DATA MONITOR" mode for "ALL MODE AWD/4WD" with CONSULT-II.
3. Read out the value of "2-4WD SOL" and "2-4WD SOL MON".
   Fig 1: Checking 2-4WD Shift Solenoid Signal

   Courtesy of NISSAN MOTOR CO., U.S.A.
   Fig 2: Identifying "2-4WD SOL" And "2-4WD SOL MON"

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

Without CONSULT-II 

1. Start engine.
2. Check voltage between transfer control unit harness connector terminal and ground.
   Fig 3: Transfer Control Unit Harness Connector Terminal And Ground Voltage Specifications

   Courtesy of NISSAN MOTOR CO., U.S.A.
   Fig 4: Checking Voltage Between Transfer Control Unit Harness Connector Terminal And Ground

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

OK or NG 

1. OK: GO TO 7.
2. NG: GO TO 3.

1. Turn ignition switch "ON". (Do not start engine.)
2. Check voltage between transfer control unit harness connector terminals and ground.
   Fig 5: Transfer Control Unit Harness Connector Terminal And Ground Voltage Specifications

   Courtesy of NISSAN MOTOR CO., U.S.A.
   Fig 6: Checking Voltage Between Transfer Control Unit Harness Connector Terminal And Ground

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

OK or NG 

1. OK: GO TO 4.
2. NG: Check 4WD shift switch. Refer to "COMPONENT INSPECTION ".

1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
2. Disconnect 4WD shift switch harness connector and transfer terminal cord assembly harness connector.
3. Check continuity between 4WD shift switch harness connector M141 terminal 4 (G/R) and transfer terminal cord assembly harness connector F56 terminal 5 (G/R).
   1. Continuity should exist. 

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

OK or NG 

1. OK: GO TO 5.
2. NG: Repair or replace damaged parts.

Fig 7: Checking Continuity Between 4WD Shift Switch Harness Connector M141 Terminal 4 And Transfer Terminal Cord Assembly Harness Connector F56 Terminal 5

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

1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
2. Disconnect transfer control unit harness connector and transfer terminal cord assembly harness connector.
3. Check continuity between transfer control unit harness connector E142 terminal 1 (GR) and transfer terminal cord assembly harness connector F56 terminal 4 (GR).
   1. Continuity should exist. 

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

OK or NG 

1. OK: GO TO 6.
2. NG: Repair or replace damaged parts.

Fig 8: Checking Continuity Between Transfer Control Unit Harness Connector E142 Terminal 1 And Transfer Terminal Cord Assembly Harness Connector F56 Terminal 4

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

1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
2. Disconnect transfer terminal cord assembly harness connector.
3. Check resistance between transfer terminal cord assembly terminals 4 and 5.
   1. 4 - 5: Approx. 22.8 - 25.2 Ω 

OK or NG 

1. OK: GO TO 7.
2. NG: 2-4WD solenoid is malfunctioning. Refer to "LOCATION OF ELECTRICAL PARTS ".

Fig 9: Checking Resistance Between Transfer Terminal Cord Assembly Terminals 4 And 5

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

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

OK or NG 

1. OK: GO TO 8.
2. 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.

Perform the self-diagnosis, after driving a vehicle for a while.

OK or NG 

1. OK: Inspection End.
2. NG: Replace transfer control unit. Refer to "REMOVAL AND INSTALLATION ".