[Gmecm] ECM test bench

[Ryan Hess]

Well, I was thinking about a set frequency 555, output 0-1V, and having a pot adjust the DC "carrier" to shift the signal off a center of 0.5V

Ryan

bcroe at juno.com wrote: I've been running some non GM stuff on the bench, just 
some wired up signal generators, displays, and access 
points for your scope, etc.  I used a circle of 8 LEDs to 
show action of the idle air motor, display would rotate 
one way or the other.  

I would be interested in how to approach an O2 sensor 
input, since its part of a loop.  You can't just set it rich 
and let unending adjustments occur.  Maybe a short 
pulse off S whenever you rock a switch off center?  

Bruce Roe

3 Aug 2006  Ryan Hess  writes:
> Hi guys,
> 
> Anybody here interested in an ECM test bench, or have a source for 
> one?  I would like to put together a test bench for myself anyways, 
> but obviously the more the merrier.  
>  
>  Or if you guys have one already to go (gerber format), I can get a 
> quote for a run of boards...
>  
>  Otherwise, I'd plan on building my own... all the inputs covered, 
> rpm, tps, map, IAT, CTS, etc etc... Maybe an o2 simulator as well. 
> Would be tailored to the 7730, but would work with most computers.  
> 
>  Thoughts, comments, suggestions?
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