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Home >> Infiniti >> 2004 >> QX56 RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1208 (Transfer Case) >> Trouble Diagnosis For Symptoms >> 4LO Indicator Lamp Repeats Flashing >> 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 
    1. Set 4WD shift switch to "2WD".
    2. Move vehicle forward and backward, or drive straight increasing or decreasing under 20 km/h (12 MPH).

    Dose 4WD shift indicator lamp keep flashing? 

    1. YES: GO TO 2.
    2. NO: Inspection End.
  2. 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 3.
    2. NG: Repair or replace damaged parts.
  3. 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 4.
    2. NG: Repair or replace damaged parts.
  4. SYMPTOM CHECK 

    Check again.

    OK or NG 

    1. OK: Inspection End.
    2. NG: GO TO 5.
  5. 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 6.
    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.
  6. 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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