Rough Running 90q

[Huw Powell]

> I wonder how bad a faulty OXS would make the car run?  If the signal is bad
> from the Lambda sensor, doesn't the ECU go into failsafe mode?  Something
> like 50% duty cycle or basically open-loop control?

It all dpends on what is wrong with the OXS.  If it sends a constant, 
say, 0v or 1v to the ECU. the ECU will respond by running the car as 
fully rich or lean as it can, trying to get the voltage back to 0.5v in 
vain.

If you *disconnect* the OXS, the ECU will read it's own internal 0.5v 
that is there on the circuit by default, or as a comparator voltage or 
something, and run the car at the basic static mixture that is set.

Which might let the car run "ok."

Why not measure the output voltage of the OXS with the car running and 
the OXS hooked up?

-- 
Huw Powell

http://www.humanspeakers.com/audi

http://www.humanthoughts.org/