O2 sensor pullup resistor values?

[Jeffrey Engel]

If the voltage is a steady .45v, the sensor is not
active or is dead.  How they determine whether the
signal transitions enough to call the sensor readings
good, I don't know.

HTH,

Jeffrey Engel
--- Peter Florance <audserv at exis.net> wrote:
> Thanks for the reply
> On my L jet box there is some sort of 'bias' that
> provides .45 volts at the
> sensor input before the sensor warms up or if it
> disconnected. I've read
> that's how they sense whether the sensor is working
> or not.
> How do they accomplish that?
> 
> 
> 
> 
> Peter Florance
> 81 euro 528i w/ 3.5L
> 
> 
> > -----Original Message-----
> > From: owner-diy_efi at diy-efi.org
> [mailto:owner-diy_efi at diy-efi.org]On
> > Behalf Of Bernd Felsche
> > Sent: Wednesday, December 05, 2001 8:16 PM
> > To: diy_efi at diy-efi.org
> > Subject: Re: O2 sensor pullup resistor values?
> >
> >
> > Peter Florance tapped away at the keyboard with:
> >
> > > Anyone have any idea of typical ECU pullup
> resistor (to ~ .45V)
> > > values for O2 sensors inputs? I'm trying to make
> a analog circuit
> > > to average 2 sensors for my L-jet box and would
> like to
> > > incorporate it in the front end of the buffers.
> >
> > The "pullup resistors" would be infinite. The
> sensor is a voltage
> > cell; it provides a voltage. Attempting to bias
> the sensor can cause
> > damage to the sensor. If you want to level-shift
> or add/average two
> > sensor inputs, the easiest solution is to use op
> amps to perform the
> > task. Their high input impedance ensures minimum
> current draw and
> > sustained operation.
> >
> > > Also interested in any comments regarding
> averaging O2 sensors for
> > > dual exhaust systems and idle performance (in
> line 6 engine)
> >
> > Before you go and build a simple adder circuit
> however, look at the
> > response curves and the consequences of what will
> happen if one is
> > receiving rich and the other a lean mixture. The
> ECU needs then to
> > see a constant switching between the levels for
> correct operation.
> >
> > --
> > Bernd Felsche - Innovative Reckoning, Perth,
> Western Australia
> >
>
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> 
>
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