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Home >> Infiniti >> 2018 >> QX60 FWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (Introduction And Basic Inspection) >> Basic Inspection >> Idle Air Volume Learning >> Work Procedure
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Work Procedure

  1. PRECONDITIONING 

    SYMBOL With CONSULT

    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 voltage: More than 12.9 V (At idle)
    • Engine coolant temperature: 70 - 105 deg. C (158 - 221 deg. F)
    • Selector lever: P or N
    • Electric load switch: OFF

      (Air conditioner, headlamp, rear window defogger)

      On vehicles equipped with daytime light systems, if the parking brake is applied before the engine is started the headlamp will not be illuminated.

    • Steering wheel: Neutral (Straight-ahead position)
    • Vehicle speed: Stopped
    • Transmission: Warmed-up
    • Drive vehicle until "ATF TEMP SEN" in "Data Monitor" mode of "TRANSMISSION" system indicates less than 0.9 V.

    GO TO 2.

  2. PERFORM IDLE AIR VOLUME LEARNING 

    SYMBOL With CONSULT

    1. Perform Accelerator Pedal Released Position Learning. Refer to Description .
    2. Perform Throttle Valve Closed Position Learning. Description .
    3. Start engine and warm it up to normal operating temperature.
    4. On CONSULT screen, select "ENGINE">>"Work support">>"IDLE AIR VOL LEARN".
    5. Touch "START" and wait 20 seconds.

    Is "CMPLT" displayed on CONSULT screen?

    YES

    GO TO 3.

    NO

    GO TO 4.

  3. CHECK IDLE SPEED AND IGNITION TIMING 
    1. Start engine and warm it up to normal operating temperature.
    2. Let it idle for 20 seconds.
    3. Rev up the engine two or three times and make sure that idle speed and ignition timing are within the specifications. Refer to Idle Speed and Ignition Timing .

    Is the inspection result normal?

    YES

    INSPECTION END

    NO

    GO TO 4.

  4. DETECT MALFUNCTIONING PART-I 

    Check the following

    • Check that throttle valve is fully closed.
    • Check PCV valve operation.
    • Check that downstream of throttle valve is free from air leakage.

    Is the inspection result normal?

    YES

    GO TO 5.

    NO

    Repair or replace malfunctioning part.

  5. DETECT MALFUNCTIONING PART-II 

    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 Idle Air Volume Learning again:

    • Engine stalls.
    • Erroneous idle.

    INSPECTION END

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