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Home >> Infiniti >> 2024 >> QX55 Essential >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control System (1 Of 2) >> Basic Inspection >> Air Fuel Ratio Initial Learning >> Work Procedure

Work Procedure

  1. PRECONDITIONING 

    Make sure that all of the following conditions are satisfied. Learning will be cancelled if any of the following conditions are missed for even a moment.

    • Battery temperature: More than 5°C (41°F)
    • Engine coolant temperature: More than 70°C (158°F)
    • Shift lever: P or N
    • Electric load switch: OFF (Air conditioner, headlamp, rear window defogger)
    • Vehicle speed: Stopped
    • Transmission: Warmed-up
    • Drive vehicle for 10 minutes.

    Do you have CONSULT '

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    GO TO 2.

  2. AIR FUEL RATIO INITIAL LEARNING 

    SYMBOL With CONSULT

    1. Perform "ACCELERATOR PEDAL RELEASED POSITION LEARNING". Refer to Description .
    2. Perform "THROTTLE VALVE CLOSED POSITION LEARNING". Refer to Description .
    3. Start engine and warm it up to normal operating temperature.
    4. Select "A/F INITIAL LEARNING" in "WORK SUPPORT" mode of "ENGINE" using CONSULT.
    5. Touch "START" and wait 20 seconds.

    "CMPLT" displayed on CONSULT screen?

    >>

    INSPECTION END

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    GO TO 3.

  3. DETECT MALFUNCTIONING PART 

    Engine component parts and their installation condition are questionable. Check and eliminate the cause of the incident. It is useful to perform "TROUBLE DIAGNOSIS - SPECIFICATION VALUE". Refer to Description . If any of the following conditions occur after the engine has started, eliminate the cause of the incident and perform "AIR FUEL RATIO INITIAL LEARNING" all over again:

    • Engine stalls
    • Erroneous idle

    >>

    INSPECTION END