Dead 02

[waterbug1999]

Take a look at my logged run, is this what one looks like?? Dont pay attention the the 1st WOT run, I know the #'s are all wacked in the AF department.

[waterbug1999]

So, which way is an 02 voltage suppose to look like? The yellow or the blue (on the bottom).

[mr.prick]

They will both float all over the place.

[waterbug1999]

But, shouldnt they be pretty similar? The blue one switches like that and doesnt change at all during a normal cruise or WOT, its all the same throught out the ~3/4 minute log.

[waterbug1999]

ok.. I put a new one in and it showed a different pattern and was good to go.. Now, I tried it again and it went back to the same pattern.. I even unplugged it and it still made the same pattern. So, something is up, anyone know what pin/s the passenger side 02 connector is on the pcm so I can to a continuty (sp) test?

[mr.prick]

Both sides will switch wildly.
If you are getting O2 codes with headers that is the norm,
mine do it too.
If there was a continuity problem I imagine you would get no readings at all.
Various model year PCM Pin Assignments

[waterbug1999]

So, your telling me if I dont have the 02 plugged in the connection ill get the same switching voltage as it does when its plugged in? Thats what its doing.

I just plugged the old one back in and layed it on the ground, it does heat up, so its getting juice. Oh, and that gave me the same switching voltage too. It jumps from .4 to .8 no matter if its plugged in or not.

[waterbug1999]

Is there a table or a place in the efilive where you can turn it off? Maybe it got turned off or something?

[mr.prick]

You are getting O2 voltage without the sensor plugged in?
You can change the O2 switch point {B4105}

[waterbug1999]

You are getting O2 voltage without the sensor plugged in?
You can change the O2 switch point {B4105}

yep.. so, something is up.

I found a pin chart. Pin 28 (low volt) does have contact with two of the pins on the 4 pin connection down below. But, pin 68 (high voltage) gets nothing. So, I am thinking that it has to get power somehow to heat up, so maybe the other two pins in the connection go somewhere else. Its impossible to trace it with all the dang wire loom all over it.

http://www.ls2.com/boggs/torques/99pinpcm.htm


Now I am trying to finad a schematic of the whole harness to see where they all go. If I can do a continutiy test and confirm its all good there. that will limit one thing out.