OK here you go
I have tried to indicate where the sensor is hidden. Basically its on top of the transfer case.
Follow the front prop shaft back to the transfer case and it should be accessible immediately to the left of the prop shaft entry point to the transfer case and on top of the transfer case.
The second image actualy shows the sensor. My one still looks pretty new.....only installed just over a month ago
You should be able to get your hand up to the sensors connector. Try pulling it on off a couple of times.
Be carefull not to pull on the wires alone...pull on the actual block connector.
With a bit of luck it may have just fouled up
or could have just loosened ......fingers crossed
As I said my KJ is an auto....manual maybe totally different and would have to request one of the forums KJ