Buick ECM Trivia

[Ludis Langens]

JTesta1966 at aol.com wrote:
> 
> << Similarly, the 1227153 and 1227148 ECMs (1986+) also contain the exact
>  same mask ROM code.  The first is batch fire (3.0 only), the second is SFI.
> >>
> 
> But, the 153 has limited ALDL info. Is that due to the proms diagnostic bits
> being limited? If this were the case, if the ROM is the same, throwing a
> 148's prom in the 153 should yield the data stream of a 148? Am I
> misunderstanding? Would you please explain?

They should have almost the same ALDL info - or at least packets of the
same length.  It is possible that the dumped locations are different -
they are specified in the EPROM.  Putting a 148 chip in a 153 should
make it talk like a 148 - however, it might not run correctly when the
chip decides to switch to SFI mode.

-- 
Ludis Langens                               ludis (at) cruzers (dot) com
Mac, Fiero, & engine controller goodies:  http://www.cruzers.com/~ludis/


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