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Home >> Infiniti >> 2004 >> QX56 RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1208 (Transfer Case) >> Trouble Diagnosis For Symptoms >> 4WD Shift Indicator Lamp or 4LO Indicator Lamp Does Not Change >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2005 Infiniti QX56. However, it is still accessible from the selected car via links, so may be relevant.
  1. CONFIRM THE SYMPTOM 

    Confirm 4WD shift indicator lamp and 4LO indicator lamp turn on when ignition switch is turned to ON.

    Do 4WD shift indicator lamp and 4LO indicator lamp turn on? 

    1. YES: GO TO 2.
    2. NO: Go to "4WD SHIFT INDICATOR LAMP AND 4LO INDICATOR LAMP DO NOT TURN ON ".
  2. CHECK SYSTEM FOR 4WD SHIFT SWITCH 

    Perform trouble diagnosis for 4WD shift switch system. Refer to "4WD SHIFT SWITCH ".

    OK or NG 

    1. OK: GO TO 3.
    2. NG: Repair or replace damaged parts.
  3. CHECK SYSTEM FOR WAIT DETECTION SWITCH 

    Perform trouble diagnosis for wait detection switch system. Refer to "WAIT DETECTION SWITCH ".

    OK or NG 

    1. OK: GO TO 4.
    2. NG: Repair or replace damaged parts.
  4. CHECK SYSTEM FOR NEUTRAL-4LO SWITCH 

    Perform trouble diagnosis for neutral-4LO switch system. Refer to "NEUTRAL-4LO SWITCH ".

    OK or NG 

    1. OK: GO TO 5.
    2. NG: Repair or replace damaged parts.
  5. CHECK SYSTEM FOR ATP SWITCH 

    Perform trouble diagnosis for ATP switch system. Refer to "ATP SWITCH ".

    OK or NG 

    1. OK: GO TO 6.
    2. NG: Repair or replace damaged parts.
  6. CHECK SYSTEM FOR 2-4WD SOLENOID 

    Perform trouble diagnosis for 2-4WD solenoid system. Refer to "2-4WD SOLENOID ".

    OK or NG 

    1. OK: GO TO 7.
    2. NG: Repair or replace damaged parts.
  7. CHECK SYSTEM FOR TRANSFER CONTROL DEVICE 

    Perform trouble diagnosis for transfer control device system. Refer to "TRANSFER CONTROL DEVICE ".

    OK or NG 

    1. OK: GO TO 8.
    2. NG: Repair or replace damaged parts.
  8. CHECK SYSTEM FOR ACTUATOR MOTOR 

    Perform trouble diagnosis for actuator motor system. Refer to "ACTUATOR MOTOR ".

    OK or NG 

    1. OK: GO TO 9.
    2. NG: Repair or replace damaged parts.
  9. CHECK SYSTEM FOR ACTUATOR POSITION SWITCH 

    Perform trouble diagnosis for actuator position switch system. Refer to "ACTUATOR POSITION SWITCH ".

    OK or NG 

    1. OK: GO TO 10.
    2. NG: Repair or replace damaged parts.
  10. SYMPTOM CHECK 

    Check again.

    OK or NG 

    1. OK: Inspection End.
    2. NG: GO TO 11.
  11. CHECK TRANSFER CONTROL UNIT 

    Check transfer control unit input/output signal. Refer to "TRANSFER CONTROL UNIT INPUT/OUTPUT SIGNAL REFERENCE VALUES ".

    OK or NG 

    1. OK: GO TO 12.
    2. NG: Check transfer control unit pin terminals for damage or loose connection with harness connector. If any items are damaged, repair or replace damaged parts.
  12. CHECK TRANSFER INNER PARTS 
    1. Disassemble transfer assembly. Refer to "DISASSEMBLY AND ASSEMBLY ".
    2. Check transfer inner parts.

    OK or NG 

    1. OK: Inspection End.
    2. NG: Repair or replace damaged parts.
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