Cal ID numbers [was Re: fuel module]

[Shannen Durphey]

Ludis Langens wrote:
> 
> "David A. Cooley" <n5xmt at bellsouth.net> wrote:
> > What are the 4 digits for anyway"?
> >
> > Mine is BMYU 1714
> 
> Me thinks that they are the last four digits of an 8 digit "part"
> number.
> 
> Every cal might have the following numbers: part number (for ordering),
> PROM ID number (scan tool), number on the cal (like a casting number), a
> number for the ECM+cal combination, and probably several others.  There
> isn't enough room for a full 8 digit number, the first two digits are
> probably "16", and the next two digits only change every few years.
> Hence, a partial number is enough.
> 
> --
> Ludis Langens                               ludis (at) cruzers (dot) com
> Mac, Fiero, & engine controller goodies:  http://www.cruzers.com/~ludis/

Actually, it's quite possible to have two calibrations with the same
letters/different numbers.  This is more prevalent in earlier years, and
I suspect there was a plan to keep the same characters and change the
numbers whenever a corrected calibration was released.  BTW, the letters
are the broadcast code, and the numbers are the external ID.

Also, while there are some proms whose part nos match the ID numbers,
this is by no means a rule.  Again, possibly the beginning of a good
idea.

Shannen