O2 questions

[chetwagner at qwest.net]

You are correct on the white wires but are backwards on the other 
two.  Grey = ground, Black = signal.

On 18 Jan 2001, at 9:11, Doug Mansfield wrote:

> 
> I have an 85 G body with a CCC carb.  After going to headers and a
> 350, I now have an O2 sensor problem.  The sensor is located in the
> collector.  At various times, the Check Engine light will come on,
> always reporting an error 13 (O2 circuit).
> 
> I had the opportunity to finally work on it.  When I hook up my Fluke
> meter to the O2 lead going to the ECM (leaving the ECM in circuit) and
> turn the key on, I immediately get a .400V readout.  Why is the .4V
> coming from the ECM?
> 
> I also picked up a heated Bosch (4 wire) sensor.  I know that two
> wires are for heating, one is a ground and one is the signal.  How are
> these hookup up?  Do I simply take the ground lead to chassis ground? 
> Which lead is which (two white, one black, one gray)?  I assume the
> white is the heating element as there is 2.5 Ohm across them.  I also
> assume the black is ground and therefore the gray is the signal I
> would hook back to the ECM.
> 
> Thanks,
> 
> --
> Doug Mansfield
> mansfield at cns.ohiou.edu
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