Originally Posted by tr1957
discovered another issue ,won't go into 4 wheel lo.
The light flashes and beeps but nothing happens.
^^^ This is a really well-known problem and falls into one of three catagories:
1. Follow the instructions exactly
. On mine I must be fully at a stop, in neutral, plant the clutch to the fire wall, push in the 4WD switch, and slowly turn it.
2. Even though it is a 4lo problem, the front ADD has a feedback mechanism to the 4WD ECU that can affect this.
3. Us it or lose it. The 4WD actuator on the transfer case itself is known to be a bad part on early vehicles and there was actually a part change about 2008 as I recall. A lot of the problems were because it was not being used and would stick or water would get in there and gum it up. Don't even try to take it apart without first reading the write-ups.
I can't link it for you now because I am traveling and the only thing I have is dial-up, but do a search and there is an entire thread about this on Toyota Nation and other Tacoma technical sites. In other words, there is a bunch of info.
I had the best luck using Google starting the search with the word "Tacoma" followed by "will not go into 4lo" or other such variants. The Toyota Nation thread is a good one because it gives diagnostics. As I remember the title of it begins something like "My Turn for Help with....". Maybe if 05Moose
is reading this he can jump in and give the TN link. Otherwise try a PM to him here or over there.