Re: What model ECM is this ?

[Shannen Durphey <shannen@grolen.com>]

Merry Christmas, John.  You have a stock ecm from a 1990,91 ZR1.  If
you check the numbers that I sent earlier by calling the dealer, you
may find that all years use the same part. 

ACFB is a record of the original calibration installed in that ecm. 
It's part of something called a broadcast code, or bcc.  It's no
surprise that yours isn't listed though.  It was never officially
released.
Shannen
Team ZR1 wrote:
> 
> Being the ECM is mounted upside down so that the E-prom door is on top for
> quick chip changes
> I removed the ecm and sure enough there is a tag on the top.
> 
> It read  SERV No 01228331
>                   868821
>               M910105000
>                16068821
>                    ACFB
> 
> Does tha clear upwhich unit and which CPU ?
> 
> Thanks,   John