On vcds there should be a specified and actual maf readings, on idle these should tally up together if reading correctly and egr is doing its thing, also take it for a run and see how they follow each other, usually there is a little lag on actual from specified as it catches up but it shouldn't be miles off, and should follow roughly the same curve, you may find like a lot of us though that there isn't a label file for your engine making logging a pain in the butt because you first have to find all the correct channels.
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