My TwoBits
See'n hows no buddy else tried to help...
It means that allowing anything to be done by a computer will eventually control you too. So unplug the damn thing, then do what you should have done in the first place: Shift it manually. The cool way to do this is replacing the xfer case with one that has a lever sticking up thru the floorboard. A more cost effective way is to remove the big gear out of the (probably good) motor you took out, and after taking the new motor off the xfer case, place the gear on the shaft to select from 2wd to 4wd (there are position indicators on the xfer case housing). Dont leave it on while driving tho, cuz it'l fall clean off.
I had alot of problems with both the vacuum actuated hubs and the electric operated xfer case. I eventually concluded that the "automatic" operation needed to be castrated, and then bypassed the "commitee" control of both. (Anyone want a 4wd dash control switch?) What I done to fix mine would not be appropriate for the faint of heart tho (involves operating the hubs with a manual, adjustable vacuum source and wiring a toggle switch/relays to the xfer case motor circuitry = no shift-on-the-fly).
There is a troubleshooting sequence that maybe helpfull (tho I havent gone thu it myself) in another thread of this forum:
http://therangerstation.com/forums/showthread.php?t=97
One other thing I havnt seen discussed here: Ive observed where the position feedback circuitry of the motor (the hermetically sealed thing with wires coming out) will overtravel and give false information to the computer. Essentially, the computer thinks its already in the position that you are trying to move to. Tho I havent tried this, (its about this time that I decided to assume control myself) there is an adjustment for this thingie. First mark the initial position (in case you want to start over) then loosen the 3 screws, try another position and tighten the screws. Repeat as necessary. Hey, you were going to toss the damn thing anyway, right?