While it's not my position to ask why you want to know, I'll point out that the adjustment should only need to be considered if the airflow meter or fuel distributor have been replaced. It is unlikely to need adjustment as a maintenance item. The most common maintenance or repair issues with the airflow meter are cleaning the throat and plate, usually done without removing it, and replacing the potentiometer mounted on the pivot axis, also done without removing the unit. This latter would be likely indicated if your idle is erratic, speeding up then slowing down to normal, sometimes with an off-idle stumble too.

Note too that the entire airflow meter and fuel distributor can be removed and reinstalled as a unit, requiring no subsequent calibration, if a really thorough cleaning is indicated.

Steve

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'91 MB 190E 2.3
'08 RAV4 Ltd 3.5
'83 Lazy Daze m'home 5.7