02 Sensor Swap Information

And there it is. Now use this info people. I know I will be!

So the titania has to have voltage sent to it.

Is that comparison diagram out of an 87-89 since they had both?

Dude, YOU RULE! You have answered the one question that has been bugging me for about two weeks. Definitely sticky this.

Is the M30 ECCS O2 sensor Titania or Zirconia?

titania

haha, its been like 6 months and i am just figuring out that I just need to run the 12 volt power from the fuel pump relay to the titania sensors heating element. :lol:

I've been looking for this for weeks…

But i'm having a hard time understanding the route it's listed.

Going from 89NA to 87T o2 & ECU.



Someone let me know if i'm getting this right:

The late model turbo shares the same general wiring on the green and black wires. I need to relocate the yellow wire from point 115 on the ECU to grounding point 36F:



So, I could just reroute the wire from the harness to the plenum ground instead of it going through to the ECU.

This is how i am interpriting the FSM wiring diagram, it seems like a fairly simple swap to go from Zirconia to Titania. I've always heard this was a tedius wiring job. :-?

someone post the 86 diagram that has the large bung titania with 3 wires

86T Harness

Is there something i need to look at on the 86T diagram?

I'm not sure what you're trying to tell me.

I have some questions as well pertaining to the '86T harness. As you can see from the shcematic above the later model ('87-89) turbo cars should have a four pin connector (40F) at the O2 sensor. Mine ('86 turbo)has a three pin connector which is identical to the N/A connector (35F) which is supposed to correspond to the zirconia sensor.

Here is the bone; I had installed an '84T JWT ECU around five years ago. When I did, I removed the titania sensor and installed the zirconia unit by swapping out the bushing in the elbow. The car ran perfect and I never thought about this until a week ago reading from here. On Sunday, I pulled the ECU and reinstalled the '86 turbo ECU and titania sensor. The bushing was seized this time and was a real PITA to remove, but I got it out after major coaxing from an impact gun. The car runs identical as before. If I was running in open loop before due to zero feedback from the O2 sensor, I should have been able to notice some sort of difference right? Why does the '86T harness not have the four pin connector? Is the '86T harness unique in this regard? If you order an O2 sensor for a '87-89 turbo car, will you get a three or four pin connector installed on it?

Ooops, I did not notice the '86T schematic link above. Thanks, that answers alot of questions. I still am not so sure why my car seemed to run fine with the zirconia sensor & '84T ECU without relocating the ground wire in the harness. I am also having some issues with what the FSM states about the titania sensor. It says that the ECU supplies the sensor with one volt and compares the resistance values using a comparitor. Does it supply the one volt through the same wire it measures the resistance on? This does not happen on the zirconia sensors? What is the purpose of pin 115 on the ECU? I thought this was a ground, which would make the wiring identical electrically.

The 86T's sensor makes no sense. Heater 2 wires? and signal…what?

Or is it heater source (+) in, grounded through housing (PTC, so it automatically stays temp needs to be) and 1 volt reference in and signal out?

I agree, waiting for clarification. Something is not right here.