Code 51, 749 ECM

[Len Sabatine]

    There may be a checksum error , the chip is NG or not seating properly.
     Might check these areas before hitting the panic button. Always a good
    idea to calc the checksum .
    Len

>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
>----------------------------------------------------------------------------
>To unsubscribe from gmecm, send "unsubscribe gmecm" (without the quotes)
>in the body of a message (not the subject) to majordomo at lists.diy-efi.org

----------------------------------------------------------------------------
To unsubscribe from gmecm, send "unsubscribe gmecm" (without the quotes)
in the body of a message (not the subject) to majordomo at lists.diy-efi.org