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<DIV><FONT face=Arial size=2>Hi all </FONT></DIV>
<DIV><FONT face=Arial size=2>Could anyone give some helpto change the
calibration for </FONT></DIV>
<DIV><FONT face=Arial size=2>a GM Truck SS10 95, with Delco black box</DIV>
<DIV><FONT face=Arial size=2> 16166340</FONT></DIV>
<DIV><FONT face=Arial size=2> 86BABBK 43212W P5</FONT></DIV>
<DIV><FONT face=Arial size=2> service 16193495.</FONT></DIV>
<DIV> </DIV>
<DIV>Thanks in advance</DIV></FONT>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>>Hi,<BR> > My best guess is:
maybe, but you would have to try it. I am not
too<BR>>confident.<BR><BR> I would need to know what year the
S-10 is from.<BR><BR> You need to know that GM did not standardize
their communication protocol. <BR>They made changes to the commands and
responses nearly every model year. We<BR>found that the 93 LT-1 responses
are quite different from the 94/95 LT-1<BR>responses. And of course the
96's are OBD-II. So this would imply that the<BR>S-10 might have a
different communication protocol.<BR><BR> You also need to
know that if you go down the 'remove the flash' route,<BR>that GM has swapped
some of the lines between the flash and the CPU. If I<BR>remember
correctly, they swapped 3 of the address lines. So by simply
reading<BR>the data in the flash, you will see garbage. It can be decoded,
but again,<BR>that is more work.<BR><BR> From what I've seen
from the software inside a number of GM PCM's, they<BR>tend to re-use their code
whenever possible. Sometimes they reuse the actual<BR>source code, and
sometimes they just reuse the ideas and the code looks<BR>similar but
different. Unfortunately the location in the flash where some<BR>specific
code (like for the speed limit) moves around alot from PCM to
PCM.<BR><BR> Also unfortunately, the speed limit change you need is
probably just 1 or 2<BR>bytes that need changing.<BR><BR> We really
only understand the 94/95 LT-1 PCM's in detail. There are people<BR>out
there that understand the earlier models pretty well, and some
that<BR>understand the later models pretty well. I'd suggest you look into
the GMECM<BR>mailing list (found at diy-efy.org) or the DIY-EFI mailing list
(same<BR>address). There are ALOT of experts there that might be able to
answer your<BR>questions, and maybe even provide some tools to help. I
have to believe that<BR>someone on this list has the code for the S-10 truck,
and might be able to<BR>point you at the location in memory that needs to be
changed.<BR><BR> You can try our software and see if it works, but
you would have to<BR>purchase a cable.<BR><BR> Thanks for finding
that error on the web page. We will go fix it.<BR><BR>Dave @
carputing.com<BR><BR><BR>"Dr.Acacio" <<A
href="mailto:aortiz@w3ti.com.br">aortiz@w3ti.com.br</A>> wrote:<BR><BR>>
--------------------------------------------- <BR>> Attachment: <BR>> MIME
Type: multipart/alternative <BR>>
--------------------------------------------- <BR>Could be possible to use your
program ( PCMReader.exe)to read a Brazilian S-10<BR>truck which has no VIN
number????<BR>Since you know the protocol to talk with the GM flash ECU there
are any<BR>chances to develop an editor for Brazilans trucks?? I know you are
involved in<BR>the OBD II version of the editor, and probably has no time do do
others<BR>projects, but we need here any tool to remove the speed
limit...<BR>Thanks in advanced....<BR>PS<BR>1.Another way to read would be
removing the flash and read it in a<BR>programmer...<BR>Do you think that the
speed limit routine will be completely different from<BR>each GM flash ECU
type????<BR>2. There are an error in your web page, the total tamount
to buy cable and<BR>software will be from 195 to US$295.00 not
245.00.....<BR>Regards.<BR></DIV></FONT></BODY></HTML>