SS10 Help

[Len Sabatine]

    GM reference is VCM - A on '95 Centril Port config. ,Err kinda , mostly 
OBD2.
    Even has 20 fuel trim Cells , 4 being Idle, supposedly not OBD2 Monitored.
    Len

>At this point there's no-body doing this ??...I'm currently working on a 
>programming
>method, but it'll be a while before I've got this one figured out. This is 
>one of the first
>truck "flash" computers.
>Lyndon.
>>-----Original Message-----
>>From: Dr.Acacio <<mailto:aortiz at w3ti.com.br>aortiz at w3ti.com.br>
>>To: <mailto:gmecm at diy-efi.org>gmecm at diy-efi.org 
>><<mailto:gmecm at diy-efi.org>gmecm at diy-efi.org>
>>Date: September 14, 2000 9:41 AM
>>Subject: SS10 Help
>>
>>Hi all
>>Could anyone give some helpto change the calibration for
>>a GM Truck SS10 95, with Delco black box
>>     16166340
>>   86BABBK 43212W P5
>>     service 16193495.
>>
>>Thanks in advance
>>
>>
>>
>> >Hi,
>>   > My best guess is:  maybe, but you would have to try it.  I am not too
>> >confident.
>>
>>    I would need to know what year the S-10 is from.
>>
>>    You need to know that GM did not standardize their communication 
>> protocol.
>>They made changes to the commands and responses nearly every model year.  We
>>found that the 93 LT-1 responses are quite different from the 94/95 LT-1
>>responses.  And of course the 96's are OBD-II.  So this would imply that the
>>S-10 might have a different communication protocol.
>>
>>     You also need to know that if you go down the 'remove the flash' route,
>>that GM has swapped some of the lines between the flash and the CPU.  If I
>>remember correctly, they swapped 3 of the address lines.  So by simply 
>>reading
>>the data in the flash, you will see garbage.  It can be decoded, but again,
>>that is more work.
>>
>>     From what I've seen from the software inside a number of GM PCM's, they
>>tend to re-use their code whenever possible.  Sometimes they reuse the actual
>>source code, and sometimes they just reuse the ideas and the code looks
>>similar but different.  Unfortunately the location in the flash where some
>>specific code (like for the speed limit) moves around alot from PCM to PCM.
>>
>>    Also unfortunately, the speed limit change you need is probably just 
>> 1 or 2
>>bytes that need changing.
>>
>>    We really only understand the 94/95 LT-1 PCM's in detail.  There are 
>> people
>>out there that understand the earlier models pretty well, and some that
>>understand the later models pretty well.  I'd suggest you look into the GMECM
>>mailing list (found at diy-efy.org) or the DIY-EFI mailing list (same
>>address).  There are ALOT of experts there that might be able to answer your
>>questions, and maybe even provide some tools to help.  I have to believe that
>>someone on this list has the code for the S-10 truck, and might be able to
>>point you at the location in memory that needs to be changed.
>>
>>    You can try our software and see if it works, but you would have to
>>purchase a cable.
>>
>>    Thanks for finding that error on the web page.  We will go fix it.
>>
>>Dave @ carputing.com
>>
>>
>>"Dr.Acacio" <<mailto:aortiz at w3ti.com.br>aortiz at w3ti.com.br> wrote:
>>
>> > ---------------------------------------------
>> > Attachment:
>> > MIME Type: multipart/alternative
>> > ---------------------------------------------
>>Could be possible to use your program ( PCMReader.exe)to read a Brazilian 
>>S-10
>>truck which has no VIN number????
>>Since you know the protocol to talk with the GM flash ECU there are any
>>chances to develop an editor for Brazilans trucks?? I know you are 
>>involved in
>>the OBD II version of the editor, and probably has no time do do others
>>projects, but we need here any tool to remove the speed limit...
>>Thanks in advanced....
>>PS
>>1.Another way to read would be removing the flash and read it in a
>>programmer...
>>Do you think that the speed limit routine will be completely different from
>>each GM flash ECU type????
>>2. There are an error in your web page, the total tamount  to  buy cable and
>>software will be from 195 to US$295.00 not 245.00.....
>>Regards.
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