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 ATP SWITCH, WAIT DETECTION SWITCH AND NEUTRAL-4LO SWITCH

Fig 1: Checking ATP Switch, Wait Detection Switch And Neutral-4LO Switch
Courtesy of NISSAN MOTOR CO., U.S.A.

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

OK or NG
1. OK: GO TO 3.
2. NG: GO TO 2.
CHECK CONTINUITY OF TRANSFER SUB-HARNESS
Check the following.
- Continuity of transfer sub-harness
  Refer to "TRANSFER SWITCH ASSEMBLY SUB-HARNESS CONNECTOR ", "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.
CHECK INPUT SIGNAL
1. WITH CONSULT-II: GO TO 4.
2. WITHOUT CONSULT-II: GO TO 5.
CHECK INPUT SIGNAL
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 Input Signal 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
CHECK INPUT SIGNAL
Without CONSULT-II
1. Turn ignition switch to "OFF" position.
2. Operate 4WD shift switch and check continuity between the following terminals.
  Continuity:
  
  Terminal 40 (ATP switch) and body ground "4H" position: No continuity should exist. Between "4H" and "4LO": Continuity should exist. "4LO" position: No continuity should exist. Terminal 25 (Neutral-4LO switch) and body ground "4H" position: No continuity should exist. "4LO" position: Continuity should exist. Terminal 43 (Wait detection switch) and body ground "4H" position: No continuity should exist. (*1) "4LO" position: Continuity should exist.
  
  *¹ : After setting from "4LO" to "4H", continuity exists while "Wait" function is operating in "4H" position. (No continuity exists when "Wait" function is canceled.)
  
  Fig 3: Checking Transfer Control Unit Connector Terminal Continuity
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 4: Moving A/T Selector To P Position
  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
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.