rickcj7

02 sensor wiring
Upstream b1s1 connector is missing with a universal 02 wired in.
The new 02 has a black, grey and 2 white wires.
The wiring in the jeep, 97 cherokee has a black,green, brown with yellow strip and black with green strip.
I have't been able to find a search with this color combination to hook up the wires.
Anyone know?
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Rick OIIIO

CCKen

Dr. Ken is here to help you.

What's a "b1s1 connector"? Are you talking about the OEM O2S connector?

Here's a pic of the 97 (I guess that's what you are talking about?) O2S upstream Oxygen Sensor connector pinout.

I would yard that "universal" O2S out of there and install a new NTK 23151 O2S. If the OEM body harness connector is missing (butcher Bubba hard at work) I would try to get an OEM replacement.

If you are going to splice in a new connector I would suggest soldering (if you are skilled at it), otherwise use weather proof butt slices.

Anyway, here's the O2S connector. You are looking at the Body harness connector. The image shows the pin sockets and the related wire colors and the circuits for each.

The O2S cnnector will be the mirror image of what you see.

Body connector pin & wire Color - O2S Connector pin & wire color

1 DarkGreen/White tracer - 1 White (12 volt input O23S Heater circuit)
2 Black - 2 Black (Heater circuit ground at ground G101, under the ignition coil)
3 Brown/Yellow tracer - 3 White
4 Black/Dark Green tracer - 4 Gray



Locationof the O2S heater fuse in the PDC.



Location of the O2S heater ground point G101.

rickcj7

Yes the 02s connector on the main wiring harness is missing and a 02s was wired into it.
The code coming up is for bank1 sensor1 heater not working, I did check the 02 heater fuse.
I have a universal 02s to wire in but the wire colors are different, couldn't
find the correct diagram after searching a few hours.
I'll double check but the green wire in my harness doesn't have a white strip?

Thank you for your help!

CCKen

That upstream O2S connector pinout is from a 1997 XJ. Sometimes it's hard to see the tracers on wires. I'm sure you have a white tracer on that Dark Green wire.

The two white wires from the O2S may be crossed. With an Ohmmeter, check for continuity between one of the O2S white wires to the black wire on the O2S, that will be the O2S heater wires. Connect that white wire to the Dark Green/White tracer wire. The remaining White O2S wire goes to the Brown/Yellow tracer wire.

Note: You'll have to have the engine running to get 12 volts from the ASD relay to that heater fuse, then to that Dark Green/White tracer wire.

rickcj7

UhOhhh
which is correct?

Harness Black/dark green = o2 sensor signal = Bosch sensor black
Harness Brown/yellow = o2 sensor ground/return = Bosch sensor gray
Harness Black & Dark Green/white are the heater element wires, connect to sensor white wires, no polarity so no difference on how white sensor wires are connected, as long as you select the right harness side wires.
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1 DarkGreen/White tracer - 1 White (12 volt input O23S Heater circuit)
2 Black - 2 Black (Heater circuit ground at ground G101, under the ignition coil)
3 Brown/Yellow tracer - 3 White
4 Black/Dark Green tracer - 4 Gray

CCKen

RickCJ7 was correct.

Here's a 97 XJ O2S diagram marked up to show the colors of the O2S wires vs. the O2S body harness colors.

I found in the 2000 XJ diagrams where the Dark Green/White wires were corrected to show just Dark Green (like you mentioned).

rickcj7

So you agree this is the correct wiring for the sensor?

Harness Black/dark green = o2 sensor signal = Bosch sensor black
Harness Brown/yellow = o2 sensor ground/return = Bosch sensor gray
Harness Black & Dark Green/white are the heater element wires, connect to sensor white wires, no polarity so no difference on how white sensor wires are connected.

CCKen

Yes.

If you go to page 4 of this document, "Universal 4 Wire Sensor", you can see the wire colors/hook ups.

http://www.ngksparkplugs.com/images/...t_11-16-04.pdf

It appears as though the FSM connector pin outs shown are incorrect.

rickcj7

I hooked it to this and it seems to be working!

Harness Black/dark green = o2 sensor signal = Bosch sensor black
Harness Brown/yellow = o2 sensor ground/return = Bosch sensor gray
Harness Black & Dark Green/white are the heater element wires, connect to sensor white wires, no polarity so no difference on how white sensor wires are connected.

Thanks Rick