O2 sensor wiring help

LilHammer97

TJ Enthusiast
Original poster
Joined
Jun 19, 2019
Messages
213
Location
Huntingdon, TN
I recently discovered my Bank 2 Sensor 2 O2 sensor was throwing a code for the heat circuit and also throwing a misfire code that is causing some abrupt bucking/power loss intermediatly while driving. When I went to inspect some wiring i had found that somebody had broken/cut the wiring right off at the harness near the fire wall. So I had to strip some wire out of the harness to be able to see the color of the wires. So far I have 2 brown wires coming from the up side of the harness and a black with a light blue stripe and a green (faded blue) coming from the down side of the harness. And to make things worse the O2 sensor is one with a black, grey, and 2 white wires. So here is my question...

What wires go to what, as in which wire to i splice to what wire to make the O2 sensor work properly again?

Its driving me crazy trying to look through the service manual and figure this out ( I've been scouring the manual and various threads for about 2 hours now). I think what I'm gonna do right now is after I figure the color schemes out im just gonna run 2 red wires and 2 black wires to get everything hooked back up for now until I can pull the harness and fully repair it.

I cant get a really good photo of the wires so I figures my 3rd grade drawing would help visualize what I'm seeing under the hood.

Black-——-> ?
Grey-———> ?
White-——> ?
White-——> ?

20200808_210908.webp
 
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According to the FSM the factory harness colors are Brown (O2 sensor 2/2 to PCM, Brown/Grey that goes to the O2 Heater Relay, the Darkblue/DarkGreen that goes to the PCM ground sensor and the Black/Lightblue that goes to a harness ground.

The white wires on the O2 sensor are for the heater element, the black is the signal wire for the PCM and the grey is the ground.
 
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