[T3] ECU's used when?

[Martin Peitz <peitz@HiWAAY.net>]

I don't have the technical service bulletins for the FI (though I have
some "confidential" stamped SB's on other stuff), but the manual shows
the following "dates of usage":

from Aug 67   311 906 021 A  replacement 311 906 021 B
from April 68 311 906 021 B  replacement 311 906 021 B
from Aug 69           021 C                      021 D
(newer stuff follows)

A and D ECU's were discontinued (some mods required, see SB 9/16).

Martin Peitz




> Your supposedly defective ECU arrived safely today, but it will have
> to wait quite a while before I can get around to looking at it in
> detail.  It was originally an "A" brain, rebuilt and converted to a
> "B" brain by Bosch at some point.
> 
> This is a little surprising because Bosch has not accepted the "A"
> brains as cores for many years, presumably because there were so many
> changes that they could not be efficiently rebuilt into the "B"s
> which superceded them.  If you just look into the two types you can
> see that the "A"s were even constructed differently from all the
> later units.
> 
> "A" brains were used in 68 and possibly some 69s, but they had some
> problems, mainly flooding when trying to start, so almost all of them
> have been swapped to "B" brains.  If anyone out there has a 68-9 with
> an "A" brain, I recommend that you make this swap.
> 
> I am guessing that VW had a "silent" recall at some point, probably
> in 69-70, and exchanged a lot of the "A"s for "B"s, and this must
> have been when Bosch rebuilt some of the "A"s into "B"s, to support
> that program.  Does anyone KNOW if, and when, VW actually did this?
>

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