Diagnostic Procedure

Shift actuator circuit .
Refer to TRANSFER SHIFT RELAY (HIGH & LOW) and ACTUATOR & ACTUATOR POSITION SWITCH under COMPONENT INSPECTION.

OK or NG
1. OK: GO TO 2.
2. NG: Repair or replace transfer shift relay and actuator and actuator position switch.
Check power source of transfer shift (HI & LOW) relay .

Fig 1: Checking Power Source Of Transfer Shift (HI & LOW) Relay
Courtesy of NISSAN MOTOR CO., U.S.A.
1. Disconnect transfer control device terminal.
2. Turn ignition switch to ON (Do not start engine).
3. Check voltage between transfer shift HI and LOW relay terminal 5 and body ground.
  Voltage: Battery Voltage
  
  Fig 2: Check Voltage Between Transfer Shift Hi & Low Relay Terminals & Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: GO TO 3.
2. NG: Check the following :
  - Continuity between ignition switch and transfer shift HI & LOW relays
  - Check ground circuit between transfer shift HI & LOW relays and body ground.
  - Ignition switch and No. 3 fuse (20A)
Check power source of transfer control device .
1. Disconnect transfer control device terminal.
2. Turn ignition switch to ON. (Do not start engine.)
3. Turn 4WD shift switch from 4H to 4LO (or from 4LO to 4H).
4. Check voltage between transfer control device terminal 3 (or 4) and body ground.
  Voltage: Battery voltage
  
  Fig 3: Checking Voltage Between Transfer Control Device Terminals & Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: GO TO 4.
2. NG: Check the following :
  - Harness and connector from transfer shift HI and LOW relays to transfer control device harness terminal
  - Ground circuit between transfer control device and body ground.
Check input signal .
1. WITH CONSULT-II GO TO 5.
2. WITHOUT CONSULT-II GO TO 6.
Check input signal .
With CONSULT-II
1. Start engine (idling).
2. Select SELF-DIAG RESULTS in Select Diag Mode.
3. Read out self-diagnostic result.
  
  Fig 4: Checking Power Source Of Transfer Shift (HI & LOW) Relay
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 5: Identifying SELF DIAG RESULTS Display Screen
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: GO TO 8.
2. NG: GO TO 7.
Check input signal .
Without CONSULT-II
1. Start engine (idling).
2. Check voltage between transfer control unit harness connector terminal 4 (or 13) and body ground while 4WD shift switch is set from 4H to 4LO (or from 4LO to 4H).
  
  Fig 6: Checking Voltage Between Transfer Control Unit Connector & Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
3. Result
  
  Fig 7: Displaying Voltage Condition Result Table
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: GO TO 8.
2. NG: GO TO 7.
Check harness continuity between transfer control unit and transfer control device .
OK or NG
1. OK: GO TO 8.
2. NG: Repair and replace harness connector between transfer control unit and transfer control device.
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/output signal inspection. Refer to TRANSFER CONTROL UNIT INSPECTION TABLE under TROUBLE DIAGNOSIS - GENERAL DESCRIPTION.
  2. If NG, recheck transfer control unit pin terminals for damage or loose connection with harness connector.