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Home >> Nissan-Datsun >> 2017 >> Maxima SL >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (Wiring Diagrams And Basic Inspection) >> Basic Inspection >> Idle Air Volume Learning >> Work Procedure >> Diagnostic Test
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Diagnostic Test

  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 - 100°C (158 - 212°F)
    • Selector lever position: P or N
    • Electric load switch: OFF

      (Air conditioner, head lamp, rear window defogger)

      On vehicles equipped with daytime light systems, if the parking brake is applied before the engine is started the head lamp will not illuminate. 

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

    GO TO STEP 2  .

  2. PERFORM IDLE AIR VOLUME LEARNING

    G-20With 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 "IDLE AIR VOL LEARN" in "WORK SUPPORT" mode.
    5. Touch "START" and wait 20 seconds.

    Is "CMPLT" displayed on CONSULT screen?

    YES 

    GO TO STEP 3  .

    NO 

    GO TO STEP 4  .

  3. CHECK IDLE SPEED AND IGNITION TIMING

    Rev up the engine 2 or 3 times and check that idle speed and ignition timing are within the specifications.

    For procedure, refer to WORK PROCEDURE and WORK PROCEDURE .

    For specifications, refer to IDLE SPEED and IGNITION TIMING .

    Is the inspection result normal?

    YES 

    INSPECTION END

    NO 

    GO TO STEP 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 STEP 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

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