No error codes with my EProm

[Programmer]

>From the scan tool, are you telling it you're a '91 vette, etc... ? Without
that data, sometimes info gets erroneous.

Lyndon.
----- Original Message -----
From: "Keith Lund" <keithl at redrocksw.com>
To: <gmecm at diy-efi.org>
Sent: Tuesday, September 04, 2001 3:16 PM
Subject: No error codes with my EProm


> I have a 1227730 ECM in a 81 vette.  I do not have the VATS hardware so
> order a stock 91 vette eprom (16159800), turned the VATS bit off, updated
> the checksum and installed the new chip.  The engine runs, but my eprom
> will not flash out the error codes.  If I install the stock eprom the
> codes flash out, but of course it complains about VATS.  I have verified
> my eprom and it has the contents I want.  Does anyone know why one chip
> would flash out codes and the other not?
>
> TIA very much.
>
> Keith
>
> Curious:  I was wondering what that small circuit board next to the eprom
> is/does.
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