Problem with 4WD and A.D.D Controls
 

I am having problem with engaging/disengaging 4WD system.
I have a Limited 2000 4Runner that has push in button on the 4wd selector stick. When I pressed it, the lights on the dash that shows 4wd system engaged are blinking. Unlocking the button or moving lever to 4wd or 2wd position
are not doing anything. Now I am half way into 4wd. I feel that the front wheels have engaged into 4wd mode, where I currently stuck. Please help me resolve this issue before EC4RJ event in 2 weeks.

I had the same problem awhile ago. BruceTS helped me troubleshoot. It was a problem with the vacuum going to the solenoids. Thanks Bruce :)

This is exactly what I was thinking.
Bruce, can you help me with some diagnostic.

Thanks,

Try this, it might help

http://www.off-road.com/toyota/tech/add/

There may be nothing wrong at all, go offroad and put it in 4WD low range and drive it around a bit, sometimes things get a bit sticky if the system hasn't been used. As for explaining exactly what may cause your problems, that would take quite a bit of explaining, since your system is quite a bit different than the link provided from another member. Not only do you have a standard ADD system, but a center diff lock as well and they are both interconnected. If you can get a Factory manual, there is a good trouble shooting guide on the system.

Thanks Bruce.

Try reversing and engaging 4WD. It worked for me when my ADD wasn't working. It's been working fine for about 5 months now.

Bratik-wish I could help, see you at SE4RJ! Don't forget the Russian cookies!

Thanks for reminding me about it. I'll put them on my list.
See you there.