Diagnostic Procedure

WARNING: This page is about a different car, the 2003 Nissan Pathfinder. However, it is still accessible from the selected car via links, so may be relevant.

CHECK 2-4WD SHIFT SOLENOID VALVE AND 4WD SHIFT SWITCH
Refer to 2-4WD Shift Solenoid Valve and Transfer Fluid Temperature Sensor,COMPONENTS INSPECTION .

Fig 1: Checking 2-4Wd Shift Solenoid Valve And 4Wd Shift Switch
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG
1. OK: GO TO 2.
2. NG: Check the following. If OK, repair or replace 2-4WD shift solenoid valve and 4WD shift switch.
  - Continuity of transfer sub-harness
    Refer to "TRANSFER SWITCH ASSEMBLY SUB-HARNESS CONNECTOR .
CHECK INPUT SIGNAL
With CONSULT-II
1. Select "ECU INPUT SIGNALS" in Data Monitor.
2. Read out ON/OFF status of "2WD SW" and "LOCK SWITCH".
  
  Fig 2: View Of Moving Vehicle
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 3: CONSULT-II Display
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK:
  1. Perform transfer control unit input/output signal inspection. Refer to "TRANSFER CONTROL UNIT INSPECTION TABLE ", "TROUBLE DIAGNOSIS - GENERAL DESCRIPTION".
  2. If NG, recheck transfer control unit pin terminals for damage or loose connection with harness connector.
2. NG: GO TO 3.
CHECK 4WD SHIFT SWITCH POWER SOURCE
1. Disconnect 4WD shift switch harness connector.
2. Turn ignition switch to "ON" position.
3. Check voltage between 4WD shift switch harness connector terminal 1 and body ground.
  Voltage: Battery voltage
  
  Fig 4: Checking 4WD Shift Switch Power Source
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: GO TO 4.
2. NG: Check the following.
  - No. 18 fuse (10A)
  - Continuity between ignition switch and 4WD shift switch
CHECK HARNESS CONTINUITY
1. Turn ignition switch to "OFF" position.
2. Check continuity between the following terminals:
  - Transfer control unit 9 and 4WD shift switch 2 (2WD)
  - Transfer control unit 18 and 4WD shift switch 5 (4H)
  - Transfer control unit 24 and 4WD shift switch 3 (AUTO)
  - Transfer control unit 23 and 4WD shift switch 6 (4LO)
  - Transfer control unit 1 and Transfer terminal cord assembly sub-harness connector 4
  - 4WD shift switch 4 and Transfer terminal cord assembly sub-harness connector 5
    Continuity should exist.
    
    Fig 5: Checking Harness Continuity
    Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: GO TO 5.
2. NG: Repair harness or connector.
PERFORM SELF-DIAGNOSIS AGAIN
After driving for a while, perform self-diagnosis again.

Refer to "TROUBLE DIAGNOSIS WITHOUT CONSULT-II ".

OK or NG
1. OK: INSPECTION END
2. NG:
  1. Perform transfer control unit input/output signal inspection. Refer to "TRANSFER CONTROL UNIT INSPECTION TABLE ", "TROUBLE DIAGNOSIS - GENERAL DESCRIPTION".
  2. If NG, recheck transfer control unit pin terminals for damage or loose connection with harness connector.