Transmission Configuration

[Roger Heflin]

You have to read the code very carefully.   The single bits/bytes
controlling this sort of stuff really cannot be found any other way.
The will only be accessed in a very limited number of places and they
won't really have any easy way to find them.

I think we (me and another) may have figured out where the VATS
(passkeyII) set is in the 93 LT1 setup.  It required figuring out what
code was set on passkey failure and then verifying (helm manual) that
this was really the code set, and then carefully examining the code
around were this code was set to figure out what it was doing.  It is
being tested to see if this actually bypasses the VATS check by
eclark.  I found the relavant code that was set and pointed him to
were in the code it was messing with it.   And he looked at the code 
very carefully and believes that he found the bit that causes the vats
failure to be ignored, testing should confirm if he did.



			Roger


 On Fri, 10 Sep 1999, CSH-HQ wrote:

> And how does one identify where the byte named manual transmission parameter 
> is?.  
> Grumpy
> 
> >
> >The byte is called the "manual transmission parameter". It is located at
> >0x0688 in my application (87 MAF TPI 1227165 ECM). If the byte is set to 1
> >it is a manual transmission. If the byte is zero, the transmission is
> >defined as an automatic.
> >
> >I tested this theory on two 87 GM vintage 165 bins. The manual transmission
> >bin was 1135acyc and the automatic bin was 1099acxt. The manual bin has this
> >bit set to 1 and the automatic bin has the bit set to 0.
> >
> >Best Regards,
> >
> >Bruce Wilcox
>  >>