[Diy_efi] Ford EEC?

[Garrett P. Beauregard]

That's what I ended up doing. Dug through the Ford schematics, found the
request wire and brought that signal to the Motec. Then found the line from
the EEC that switches the clutch relay on and ran that to the Motec. A
little parameter setting and voila, the AC works. Just a PITA.

Garrett

-----Original Message-----
From: diy_efi-bounces at diy-efi.org [mailto:diy_efi-bounces at diy-efi.org]On
Behalf Of Steve Ravet
Sent: Thursday, September 09, 2004 2:25 PM
To: A list for Do-It-Yourself EFI
Subject: RE: [Diy_efi] Ford EEC?


> -----Original Message-----
> From: diy_efi-bounces at diy-efi.org
> [mailto:diy_efi-bounces at diy-efi.org] On Behalf Of Garrett P.
> Beauregard
> Sent: Saturday, September 04, 2004 4:25 PM
> To: A list for Do-It-Yourself EFI
> Subject: RE: [Diy_efi] Ford EEC?
>
> Dan,
>
>
> Thanks for the response. Here's my problem: the new engine is
> controlled entirely by a Motec box but the original EEC still
> has most of its original inputs (MAF, crank and cam sensors,
> cylinder head temp, oil pressure, etc.).
> The engine runs fine and the dashboard gauges and controls
> are doing their thing. BUT, the A/C compressor won't come on
> with the selector on A/C or Max A/C. I've jumpered the clutch
> relay and it works and the air blows cold, so the system is
> working. We cleared out all the DTCs and the A/C came on but
> only for a minute or so before one of the DTCs popped up and
> the system shut off.

I don't know about the Ford, but on GMs the computer has an "AC request"
input, and an "AC enable" output.  The request signal comes from the AC
controls, and the enable goes to the compressor clutch, if the computer
decides to let you have AC.  I'd say take the EEC out of the loop and use
the controls to switch the clutch directly.  You'll probably want to use a
relay, and make sure you understand the polarities of the request and enable
signals.

--steve


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