Some ALDL questions

[Stephen Thurber]

The data link connector on my 93 Geo Tracker has the same pinout as the
ALDL connector illustrated on the web site discussed below.  Anyone know if
it is an ALDL interface? (wouldn't surpirse me, the transmission is a GM 
180C)
 =========================
On Sun, 6 Apr 1997 FJB203 at aol.com wrote:

> >  I believe this diagram was submitted by George M. Daily.
> 
> And about six others, actually. :).  This is the exact schematic I shoved on
> my website.  I think all of the caps I used were 1uf's or .1 ufs, feel free
> to stop at http://members.aol.com/fjb203/index.htm and on the left side of
> the menu I created, click on "GM ALDL".  I have the schematic with the
> values, as well as all of the associated GM codes I could find.
> 
> >  2) Has anyone actually built this circuit/cable and tried it???
> 
> I built it, and attached it to the engine I have sitting on a moving dolly in
> my garage (3.8L 1986 GM engine from a Buick LeSabre.  I haven't devised
> software yet, I had received a copy about a month ago of a basic
> hard-coded-to-com1: terminal that would work with the ALDL interface however
> due to  my being a disorganized moron I can't find it on the hard disk.
> 
> >  3) Does it work with the 160baud CCC and the 8192baud P4 computers?
> 
> I believe its 160baud only, however I don't recall of that's a limitation to
> the circuit or because of the software I was sent :)
> 
> >  4) What does the data output look like after it comes through?
> 
> The GM vehicles send padder codes between each error code.  I think its
> 12,12,12, then 12 <error code> 12, and repeats through all the error codes.
>  Again, on my website the code transmission information is there.  This is a
> combination of what I've leached from various websites relating to ALDL as
> well as what I've gotten out of Chilton manuals.  Personally, I haven't
> gotten this far... still have the engine sitting on a moving dolly.
> 
> >  I am trying to build this so that I may diagnose my 1987 Buick Park
> >  Avenue. (Picked it up for $550.00)  Unfortunately I don't have enough
> >  money to afford the Diacom package.
> 
> Good deal :) :) :).  Side comment to George M. Dailey - SEE, I'm not the only
> bargain hunter <G>.
> 
> Frederic Breitwieser
> Homebrew Automotive Mailing List
> http://members.aol.com/fjb203/index.htm
>