Found this looking but doesn't match your colors here is the link to the thread
It was a 94 4.0.
O2 sensor should or should not be connected to ?? - JeepForum.com
Think you're right. i've looked at the wiring again comparing with a 4wire O2 plug layout and found the wire black/light blue comming from the PCM and supplying sensors with voltage so the O2 sensor plug, i think is like this
- Dark green/orange=12Vdc coming from start ignition supplying the heating element in the O2 sensor
- black is ground from the O2 heating element
- black/light blue is voltage from PCM to O2 sensor
- black/drk green is O2 sensor voltage output to PCM, for controlling air/fuel mix.
How far up the harness was it cut off? Can you go back in the wire loom and find the right wires???