Re: Motronic question

[Huw Powell <audi@mediaone.net>]

Charlie Smith wrote:
> 
> Earlier, DeWitt Harrison wrote:
> >
> > In the CIS systems, there is a basic CO adjustment that
> > insures the mixture control system is operating about
> > the center of its control range in closed loop.  For example
> > some, maybe all, of us CISers can set this by monitoring
> > the duty cycle of a mixture control signal without resorting
> > to actual CO measurement.
> 
> I think the only 'mixture control signal' like you are describing
> is the O2 sensor output.

nah, it's the frequency valve duty cycle, measured at a test connector
by the R side strut tower.

> > The big question is do the Motronic systems of the
> > same late eighties era have an analogous situation
> > and means of monitoring the control loop without
> > CO measurement? Major Bosch guru points potential
> > here.

And on CIS-E you are measuring the control pressure regulator
(differential pressure actuator, whatever...) current.  

Motronic I am clueless.  Didn't read that part of the book.

But you won't be able to adjust anything by measuring the OXS output,
it's either gonna oscillate in range or peg one way or the other once
the static mixture is too extreme for the ecu to correct.

-- 
Huw Powell

http://www.humanspeakers.com/audi/

82 Audi Coupe; 84 4kq; 85 Coupe GT; 73 F250