[Gmecm] GM Marine EFI

[Mike Drapac]

Gary

I have a GM crate motor, a 350 cu in Ramjet.  It's originally a marine 
engine with the same connector (I think).
GM sells a little ( 2 in x 2 in x 0.5 in) hand held decode with an LED that 
does the diagnostic "blink codes".  I also have the Rinda software for the 
350 in engine that runs on a laptop.

I can get you the P/N of the "blink code" readout if you like.  You can 
probably get it direct from GM.  It can't be that expensive.  I'd never want 
to run an engine without one.

Arizona Speed and Marine is also an excellent source.  They re-programmed my 
Ram Jet for me.
[www.azspeed-marine.com]

Hope this helped.

Mike Drapac
----- Original Message ----- 
From: "Gary Curtis" <gscurtis at yahoo.com>
To: <gmecm at diy-efi.org>
Sent: Monday, November 14, 2005 5:32 PM
Subject: [Gmecm] GM Marine EFI


>I have a 1996 Malibu Boat with an Indmar 320HP 5.7
> Vortec Engine equipped with a GM MEFI-2 unit. I want
> to read the fault codes from the diagnostic connector.
> I know that Rinda makes a Marine version of Diacom but
> I do not want to spend $580 just to read the codes
> from my laptop.
>
> 1) Does anyone have the pin out for this connector?
> It is not a standard Automotive ALDL connector (It has
> 10 pins).
>
> 2) Do I need a special circuit or is a standard PC
> serial interface acceptable?
>
> 3) How do I interpret the serial bit stream?
>
> 4) Where can I find an On-line technical source to
> learn about this EFI unit?
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