Code 51, 749 ECM

[Barry Tisdale]

Yup, that's it.  Don't know how my Root.bin got changed *from* AA, but
all's well not.  Never knew what the unique ID for 'experimental' was.

Thank you.

At 08:59 AM 5/15/01 -0700, romans, mark wrote:
>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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