Diagnostic Procedure

CHECK ATP SWITCH, WAIT DETECTION SWITCH AND NEUTRAL-4LO SWITCH
Refer to ATP SWITCH, NEUTRAL-4LO SWITCH AND WAIT DETECTION SWITCH .

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

OK or NG
1. OK: GO TO 2.
2. NG: Replace ATP switch, neutral-4LO switch, or wait detection switch.
CHECK INPUT SIGNAL
Do you have CONSULT-II?

Yes or No
1. Yes: GO TO 3.
2. No: GO TO 4.
CHECK INPUT SIGNAL
With CONSULT-II
1. Select "SELECTIONS FROM MENU" in Data Monitor.
  
  Fig 2: Displaying CONSULT-II DATA MONITOR Screen
  Courtesy of NISSAN MOTOR CO., U.S.A.
2. Select "ATP SWITCH", "N POSI SW TF" or "WAIT DETCT SW".
3. Read out the ON/OFF status of "ATP SWITCH", "N POSI SW TF" or "WAIT DETCT SW". Refer to REFERENCE VALUE IN DATA MONITOR MODE .
OK or NG
1. OK: GO TO 7.
2. NG: Check the following.
  - Harness continuity between neutral-4LO switch, ATP switch, wait detection switch harness connectors and transfer control unit
  - Continuity between neutral-4LO switch, ATP switch, wait detection switch harness connectors and ground
CHECK HARNESS GROUND CONTINUITY
Without CONSULT-II
1. Turn ignition switch to OFF position.
2. Disconnect ATP switch F55, neutral-4LO switch F60, and wait detection switch F59 harness connectors.
3. Check continuity from harness connectors to ground.
  
  Fig 3: Checking Connectors Continuity
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 4: Checking Continuity From Harness Connectors To Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: GO TO 5.
2. NG: Check the following.
  - Circuit between neutral-4LO switch, ATP switch, wait detection switch harness connectors and ground
CHECK HARNESS CONTINUITY
Without CONSULT-II
1. Turn ignition switch to OFF position.
2. Disconnect transfer control unit E143, ATP switch F55, neutral-4LO switch F60, and wait detection switch F59 harness connectors.
3. Check continuity between the following terminals.
Fig 5: Connector Terminal Table
Courtesy of NISSAN MOTOR CO., U.S.A.

Fig 6: Checking Continuity Between Terminals
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG
1. OK: GO TO 6.
2. NG: Check the following.
  - Circuits between transfer control unit harness connector and neutral-4LO switch, ATP switch, and wait detection switch harness connectors.
CHECK SWITCH POWER SOURCE
Without CONSULT-II
1. Turn ignition switch to ON position.
2. Disconnect ATP switch F55, neutral-4LO switch F60, and wait detection switch F59 harness connectors.
3. Check voltage between the following terminals.
Fig 7: Connector Terminal Table
Courtesy of NISSAN MOTOR CO., U.S.A.

Fig 8: Checking Voltage Between Terminals
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG
1. OK: Inspection End.
2. NG: GO TO 7.
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 .
  2. If NG, recheck transfer control unit pin terminals for damage or loose connection with harness connector.