RE: Duty Cycle Test Connection

[Aleksander Mierzwa <alex@matrix.com.pl>]

I have measured the DC with a dwell meter. As I removed the dipstick
(the mixture went lean, so the ECU was trying to richen it) I could see
the DC _increase_. Because the longer the frequency valve is open the
richer the mixture, I think I was observing the "true" duty cycle. I
would be glad to hear a definite answer to that.

Aleksander Mierzwa
Warsaw, Poland
mailto:alex@matrix.com.pl
87 Audi 5000CS turbo (mine)
88 Renault Medallion wagon (mom's)
91 mountain bike (just in case both cars broke at the same time :-)

> -----Original Message-----
> From:	Russell Southerlin [SMTP:russell.s.southerlin@lmco.com]
> Sent:	Friday, January 23, 1998 11:40 PM
> To:	Mark.POLLAN@mci.com
> Cc:	quattro@coimbra.ans.net
> Subject:	RE:Duty Cycle Test Connection
> 
	[...]
> This connection will give you a +12V when the OXS F/V is closed (lean)
> and 0V when OXS F/V is open (rich). I'm a little unclear here but I
> think this would read "opposite duty cycle". In other words when you
> first start the car cold it is supposed to read ~80% DC until the 02
> sensor warms up and then the lambda circuit takes over. I think with
> this connection you will get 20% DC - no big deal as long as you know
> this.
>