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HOMESERVICE MANUALSINFINITI2019Q70 3.7 LUXE, AWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 1 (ENGINE CONTROL SYSTEM (5.6L) (3 OF 3))BASIC INSPECTIONIDLE AIR VOLUME LEARNINGWORK PROCEDURE
2019 Infiniti Q70 3.7 Luxe, AWD

Work Procedure

2019 Infiniti Q70 3.7 Luxe, AWDSECTION Work Procedure
WARNING: This page is about a different variant/trim than selected.
  1. PRECONDITIONING 

    Check 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 position: 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 illuminate.

    • Steering wheel: Neutral (Straight-ahead position)
    • Vehicle speed: Stopped
    • Transmission: Warmed-up
      • With CONSULT: Drive vehicle until "ATF TEMP 2" in "DATA MONITOR" mode of "A/T" system indicates less than 0.9 V.
      • Without CONSULT: Drive vehicle for 10 minutes.

    YES

    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. Select "IDLE AIR VOL LEARN" in "WORK SUPPORT" mode.
    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 

    Rev up engine two or three times and check that idle speed and ignition timing are within the specifications.

    For procedure, refer to IDLE SPEED  and IGNITION TIMING  .

    For 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.
    • Incorrect idle.

    INSPECTION END

RENDER: 1.0x

NO RELATED

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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.