which 3 wire O2 sensor ?

[Bruce Plecan]

-----Original Message-----
From: Stowe, Ted-SEA <StowT at PerkinsCoie.com>
To: 'diy_efi at efi332.eng.ohio-state.edu' <diy_efi at efi332.eng.ohio-state.edu>
Date: Monday, September 21, 1998 7:54 PM
Subject: RE: which 3 wire O2 sensor ?


>is the 4th wire a ground for the sensor ?
>and the other two are the heater ?
>
>it is possible to read the resistance value of the heater to determine the
>temperature of the sensor ?

I asked around on that and if anyone knows they aren't answering,
Assuming your talking about a 3-4 wire unit.

 or I suppose the ECU does that and if it is out
>of range it goes open loop.

I've never seen any strategy like that.  They seem to use O2
crossings
>
>what is the common scheme to check the temp and keep it within limits ?

Normally on all the time
Bruce



>
>-----Original Message-----
>From: Jim Lill [mailto:jpl at vectorbd.com]
>Sent: Monday, September 21, 1998 3:30 PM
>To: diy_efi at efi332.eng.ohio-state.edu
>Subject: Re: which 3 wire O2 sensor ?
>
>
>
>I should have mentioned in my previous posting that the P/N I selected
>were the ones with the longest harnesses at the cheapest prices.
>
>
>-Jim Lill  http://www.vectorbd.com/users/jpl
>
>
>