Zirconia O2 sensor alternate modes of operation

[Zack]

TK,

Ahh, so the GM ECU >doesn't< read the current.  That's what I thought.
	So anyway, back to my original question, if I bias the sensor with a low
voltage and read the current flowing through it, do I have the potential to
damage it in any way?  And if not... over what range of A/F ratios can I
get a reliable measurement?

Zack

----------
> From: TBK <terryk at foothill.net>
> To: diy_efi at efi332.eng.ohio-state.edu
> Subject: Re: Zirconia O2 sensor alternate modes of operation
> Date: Sunday, February 22, 1998 1:13 AM
> 
> I think it is .456V supplied through 1Mohm. When the sensor heats, it's
> resistance drops and can now overcome the bias voltage. The .456V is just
> there to fool the ECM until the sensor is warm.
> 
> Right or wrong Peter?
> 
> TK
> -----Original Message-----
> From: Zack <zubenubi at inetport.com>
> To: diy_efi at efi332.eng.ohio-state.edu <diy_efi at efi332.eng.ohio-state.edu>
> Cc: nacelp at bright.net <nacelp at bright.net>
> Date: Saturday, February 21, 1998 10:57 PM
> Subject: Re: Zirconia O2 sensor alternate modes of operation
> 
> 
> >Bruce,
> >
> >So you're saying the GM units bias the sensor and read the resulting
> >current?
> >Interesting, I didn't know there were any production cars that used that
> >method.
> >
> >Zack
> >
> >----------
> >> From: bruce plecan <nacelp at bright.net>
> >> To: diy_efi at efi332.eng.ohio-state.edu
> >> Subject: Re: Zirconia O2 sensor alternate modes of operation
> >> Date: Sunday, February 22, 1998 1:11 AM
> >>
> >> In the GM applications I've worked on, all had a .44v applied to
> >> the O2 sensor, didn't matter if they were heated or not.
> >> Bruce
> >
>