Was: [Gmecm] P6 ECM information? Now: Cadillac ECM info

[William Lucke]

I was under the impression that fundamentally there wasn't much 
difference between ISM and IAC operation. IE, both devices are stepper 
motors. The only big difference is the nose switch in the end of the ISM 
which closes when the driver lifts off the throttle and tells the 
computer that it needs to be controlling idle. IOW, an IAC ECM ought to 
be able to control an ISM engine, but an ISM ECM won't be able to 
control an IAC engine unless provision is made for a "throttle closed" 
switch to tell the computer when to operate the idle device.
At least, that is my understanding of how the systems work.




Will


> From: Ryan Hess <rgmecm at yahoo.com>
> Subject: Was: [Gmecm] P6 ECM information? Now: Cadillac ECM info
> 
> I just found some info on a relatively common ECM that piqued my  interest.  Apparently, the 16132240, commonly found on 90s 4.9L  cadillac engines is not only sequential, but has tons of RAM and a  512kb chip.  Strangely, it's exterior looks a lot like a  '7730.......  Apparently in caddy style, it uses an idle motor vs  an idle stepper, so don't know what it would take to address  that.  I think it looks promising though.
>   
>   Ryan