Diacom Help

[alexpeper]

I had same GM data problem looking at Tech-2 obd-2 with simulator.
The same message will put one car in drive and another in reverse.
This, seems rather confusing way of building data tables.
All other manufacturers seem to have bettter design in that RPM means RPM
for all years and models.
There is rather exclusive(expensive) institute called ETI that manufactures
supply scan tool data to,
thou it seems not all, which separates factory scan tools from aftermarket.
Alex



----- Original Message -----
From: Roger Heflin <rah at horizon.hit.net>
To: <gmecm at diy-efi.org>
Sent: Thursday, May 11, 2000 4:21 PM
Subject: Re: Diacom Help


>
>
> On Thu, 11 May 2000, Dave Zug. wrote:
>
> >
> > > The diacom gdf file is pretty much the format that comes straight from
> > > the GM ALDL data stream.  I have been able to decode it using the
> > > assumption that it is the same as the standard data stream.
> >
> > That may be enough reason for nothing to be offered.
> >
> > >
> > > This also means that the data stream is different for almost every
> > > vehicle+computer combination, so making the above is much more
> > > difficult that it appears.
> > >
> >
> > Nope. exactly as difficult as it appeared *to me*  ;-) but time
consuming
> > yes. if *I* were doing it, I'd stick to the cars I own ;-)
> >
> I would stick to cars I own too.
>
> > I can't imagine that diacom supports ALL of these combo's.. probably the
> > most common, worthwhile, or ALL if the formats were cut and paste for
the
> > developer (formats bought from manufacturer).. which would qualify as
*hard
> > work* or *expensive to the project* and thus never given away..
> > understandably so.
>
> I suspect the format data specs were bought.   I also suspect that if
> the program was written correctly you would be able to describe an
> entire data stream for a given vehicle in a fairly small amount of
> bytes, I bet there is alot common with what is in the datastream, but
> how many codes there are and exactly where they are is probably what
> GM changes more.  I know diacom does not display all of the data that
> is actually in the data stream.  It does not (on my car) display
> things such as the current tranny gear, but I have gotten it from the
> datastream by directly checking the diacom data file.
>
> Roger
>
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