4-wheel drive not working

[IrishJay]

Ok,so I've got a '92 4runner.I bought it about 7 months ago and when I bought it,I was informed that the 4WD didn't work.The previous owner said that he was told(by a mechanic)that it was likely a fuse(on the 4WD tranny).
Can anyone give me some insight on this issue?
Thanks

 

[Martinjmpr]

I don't know much about 2nd gen 4runners - does it have a switch or a lever? If it has a lever then it might be the ADD. I know on some 3rd gen 4runners, the ADD can go out of a vacuum line gets pulled out or plugged and keeps the front axle from engaging, even though the t-case is in 4wd.

 

[IrishJay]

@Martinjumper

It's a lever control. What's the ADD. Someone told me to switch the vacuum lines to see if that was the problem.They also mentioned the VSV.Got any idea what that is?

 

[purevenom1]

The VSV is the vacuum switching valve. There is 2 of tehm located on the passenger fenderwell. One is blue and the other is pink I believe. Teh lines could be crossed somewhere causing it to not engage. Does the 4wd light come on when it is put into 4wd?