EPROM

[Roger Heflin]

Louis Baiani wrote:
> 
> Okay, anyone understand changes made to the TCC lockup values on a
> 7747?  I suppose for a 6026 no one really understands how it works.
> 
> Below is a table of values that have changed from the original stock
> calibrator to a replacement stock calibrator which fixes TCC lockup
> problems.  With the contents in the first colum, TCC lockup occured in
> 2nd gear (noticed if you held it in 2nd).  It engaged at around 16-18
> MPH.  In 3rd, the TCC engages right away - (perhaps speed set too low).
> Same with 4th gear.
> 
> Now, with the contents in the 2nd column, TCC lockup no longer occurs in
> 2nd, comes on at 42-43 MPH in 3rd, and similar for 4th (or a bit higher,
> would have to test again).
> 
> The 3rd column is values from an ADS powerchip.  The powerchip has TCC
> modifications to it as well - the chip hasn't been tested yet.
> 
> So can anyone figure out what those values represent, perhaps comparing
> how they work on a newer ECM?
> 
> Thanks,
> 
> Louis
> 
>  001E4        45        131         96
>  001E5        42        128         89
>  001F8        80        131        128
>  001F9        74        128        120
> 
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See:

http://www.cableone.net/rahmrh/disassnotes.html#TCCLOCKUPTABLE

For a explaination of a 93 models TCC tables, I suspect that GM did 
something similar (but simpler) on the earlier models.


			Roger
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