I have been loosely following this thread. Lately I have been
generally curious about how engine ECU's work.

I found this page.

http://zone.ni.com/devzone/cda/tut/p/id/3064

May be of interest to some. I know it shed a *little* light for me.

Cheers,

Neil.

On Mon, Aug 4, 2008 at 10:43 AM, Dennis Haynes <d23haynes57@hotmail.com> wrote:
> The decisin for the ECU to attempt closed loop operation is based on coolant
> temparature, time engine running, and throttle switch/engine rpm.
>
> The signal at the O2 sensor input will effect what the ECU tries to do in
> closed loop operation.
>
> Dennis
>
>
>