Diagnostic Procedure

Fig 1: Checking ATP Switch, Wait Detection Switch & Neutral-4LO Switch

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

Refer to ATP SWITCH, NEUTRAL-4LO SWITCH AND WAIT DETECTION SWITCH  under COMPONENT INSPECTION.

OK or NG 

1. OK: GO TO  3.
2. NG: GO TO  2.

Check the following.

• Continuity of transfer sub-harness

  Refer to TRANSFER SWITCH ASSEMBLY SUB-HARNESS CONNECTOR  under COMPONENT INSPECTION .

OK or NG 

1. OK Repair or replace ATP switch, wait detection switch or neutral-4LO switch.
2. NG Repair or replace transfer sub-harness.

1. WITH CONSULT-II GO TO  4.
2. WITHOUT CONSULT-II GO TO  5.

With CONSULT-II 

1. Select ECU INPUT SIGNALS in Data Monitor.
2. Read out the ON/OFF status of ATP SW, NEUTRAL SW and WAIT DETCT SW.
   Fig 2: Checking ATP Switch, Neutral Switch and Wait Detection Input Signals With CONSULT-II

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

OK or NG 

1. OK: GO TO  6.
2. NG Check the following  :
   • Harness continuity between transfer switch assembly sub-harness connector and transfer control unit
   • Continuity between transfer switch assembly sub-harness connector and body ground

Without CONSULT-II 

1. Turn ignition switch to OFF position.
2. Operate 4WD shift switch and check continuity between the following terminals.

   Continuity: 

   1. Terminal 40 (ATP switch) and body ground 
      1. 4H position: No continuity should exist. 
      2. Between 4H and 4LO: Continuity should exist. 
      3. 4LO position: No continuity should exist. 
   2. 1. Terminal 25 (Neutral-4LO switch) and body ground 
      2. 4H position: No continuity should exist. 
      3. 4LO position: Continuity should exist. 
   3. Terminal 43 (Wait detection switch) and body ground 
      1. 4H position: No continuity should exist.  (After setting from 4LO to 4H, continuity exists while Wait function is operating in 4H position. (No continuity exists when Wait function is canceled.)
      2. 4LO position: Continuity should exist. 
   Fig 3: Checking Continuity Between Transfer Control Unit Connector & Ground

   Courtesy of NISSAN MOTOR CO., U.S.A.
   Fig 4: Identifying 4WD Shift Switch

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

OK or NG 

1. OK: GO TO  6.
2. NG: Check the following. 
   • Harness continuity between transfer switch assembly sub-harness connector and transfer control unit
   • Continuity between transfer switch assembly sub-harness connector and body ground

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  under TROUBLE DIAGNOSIS - GENERAL DESCRIPTION.
   2. If NG, recheck transfer control unit pin terminals for damage or loose connection with harness connector.