2004 Infiniti QX56 AWDFACTORY OEM SERVICE PROCEDURE

Diagnostic Procedure

  1. INSPECTION START 

    WITH CONSULT-II 

    1. Turn ignition switch ON.
    2. Select "SELF DIAG RESULTS" mode with CONSULT-II.
    3. Touch "ERASE".
    4. Perform DTC Confirmation Procedure. 

      See DTC CONFIRMATION PROCEDURE .

    5. Is the 1st trip DTC P0605 displayed again?

    WITH GST 

    1. Turn ignition switch ON.
    2. Select MODE 4 with GST.
    3. Touch "ERASE".
    4. Perform DTC Confirmation Procedure. 

      See DTC CONFIRMATION PROCEDURE .

    5. Is the 1st trip DTC P0605 displayed again?

    Yes or No

    Yes: GO TO 2.

    No: INSPECTION END 

  2. REPLACE ECM 
    1. Replace ECM.
    2. Perform initialization of NVIS (NATS) system and registration of all NVIS (NATS) ignition key IDs. Refer to ECM RE-COMMUNICATING FUNCTION .
    3. Perform ACCELERATOR PEDAL RELEASED POSITION LEARNING .
    4. Perform THROTTLE VALVE CLOSED POSITION LEARNING .
    5. Perform IDLE AIR VOLUME LEARNING .

      : INSPECTION END 

Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.