No combs on a "new" ECM

[Bob Wooten]

Cool.  I thought I saw on the print for the ECM a chip that connects right
to the ALDL & I assumed that it was an RS232 converter/level shifter. is it
just a buffer of sorts?

BW



-----Original Message-----
From: owner-gmecm at diy-efi.org [mailto:owner-gmecm at diy-efi.org]On Behalf
Of Ludis Langens
Sent: Friday, June 22, 2001 9:41 PM
To: gmecm at diy-efi.org
Subject: Re: No comms on a "new" ECM


Bob Wooten wrote:
>
> So it is likely then that if the ECM appears to be running fine (not in
LHM)
> but the comms don't work that the RS232 chip is in fact bad & that
changing
> it MIGHT make it work again.  I suppose as the spare in the trunk ECM it
is
> not the end of the world if the RS232 does not work, as long as I can get
> home.

Quick comment - it's not an "RS232" chip.  The ALDL port nominally uses
TTL signal levels (0 to 5 volts).

--
Ludis Langens                               ludis (at) cruzers (dot) com
Mac, Fiero, & engine controller goodies:  http://www.cruzers.com/~ludis/


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