[s-cars] How to test the MAF? Trying to solve fault 2224

[Theodore Chen]

--- chris chambers <fastscirocco_2000 at yahoo.com> wrote:
> I found information on sjmautotechnik.com trhat leads me to believe I
> may have a problem with the MAF. According to this page:
>
> http://www.sjmautotechnik.com/20vboost.html#oboost
>
> I have run across a couple of 20V Turbo cars which had a 2224 code
> stored inside the ECU and were getting the overboost fuel pump cutout,
> even though the boost was only going up to 1.0-1.2 bar. In the first
> case this would occur only when the throttle was quickly floored, and
> would not happen if the throttle was gradually opened all the way. In
> the first case, it ended up being a defective MAF sensor. In the other
> case it was only a poor connection at the MAF sensor. Try using some
> contact cleaner on the MAF connector and terminals, and see if the
> overboost problem is eliminated.
>
> My plan is to clean teh connectors as good as possible, and swap the
> MAF from the Silver S4 to the black S4. If it is a bad MAF it should
> act up on the Black one (hers) and not mine!
>
> right?

yes, if it's the MAF.  if it's a problem with the connector on the car,
swapping MAFs won't change anything (unless your tinkering around scrapes
the connector and gets you a good connection).  BTW, bentley describes
a procedure for testing the MAF.  mine failed and put the car into
limp-home mode.  the tests described in the bentley manual indicated that
the MAF was dead.  a new MAF fixed the problem.

-teddy


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