Code 51, 749 ECM

[romans, mark]

Set the prom ID to AA and the ecm will ignore the checksum calc.  Other wise
the ecm sees that the bytes don't add up to the checksum and you get a code
51.
Mark
----- Original Message -----
From: "Barry Tisdale" <btisdale at cybersol.com>
To: <gmecm at diy-efi.org>
Sent: Tuesday, May 15, 2001 5:45 AM
Subject: Code 51, 749 ECM


> Can anyone tell me *specifically* what a Code 51 (PROM error) is?  Reason
I
> ask is that just recently some (not all) of my chips w/ just a single byte
> change result in this code being set.  What worked fine before now
doesn't.
>  PROM images read back fine, contain the data they're supposed to, but I
> get the rapid flashing Check Engine light & poor running.  Switching to a
> 'good' PROM (I've got a 16 position selector switch), then back to the
> 'bad' PROM results in proper running of the 'bad' chip.  I'm using 262k
> PROMS, each has 16 x 16k programs within.
>
> Where should I be looking for the problem?  Many more details if
interested.
>
> Thanks - Barry
> --------------------------------------------------------------------------
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