[Gmecm] Ignition off fan

[Scott Peitzsch]

Sadly, no.  The '749 ECM lacks quad driver U20, which would normally
have driven the Secondary Cooling Fan output at pin F8.  Its sister ECMs
(the '727 and '730) have this driver and the capability to run both fans.

Since you're reworking code anyhow, or at least on your way, you might
consider redirecting the secondary fan output to another existing quad 
driver
channel whose original function can be eliminated in your application.

-Scott

----- Original Message ----- 
From: "Robin Handley" <Robin at FuryWorld.fsnet.co.uk>
To: <gmecm at diy-efi.org>
Sent: Tuesday, June 27, 2006 6:34 PM
Subject: Re: [Gmecm] Ignition off fan


> Thanks Scott. Both fans?
>
> Robin
>
> ----- Original Message -----
> From: "Scott Peitzsch" <jlg-sep at comcast.net>
> To: <gmecm at diy-efi.org>
> Sent: 27 June 2006 23:26
> Subject: Re: [Gmecm] Ignition off fan
>
>
>> > Anybody know if the Sunbird/$58 code supposed to keep the fan running
> when
>> > you turn the ignition off? There seem to be calibration timing values
>> > which
>> > suggest it... but mine goes off (mind you, it is wired as the hot fan,
> and
>> > that may be different. Trying to work my way through the fan code...
>>
>> Yes, there is code which will allow the fans to run-on after ignition-off
> if
>> the
>> coolant temp is above a threshold.  This feature is especially useful on
> the
>> turbo Sunbird when its been shut off immediately after a hard run on a 
>> hot
>> day.
>>
>> -Scott
>>
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