93 T4R Transfer case help!

[volt110]

New to forum, I need help with this one. 93 with the 3.0 six auto. Last week while going into 4L, everything okay. Went to go back to 4H and 2H she wouldn't move! Long story short, will drive and shift only in 4L. Everything else seems okay. Any suggestions where to start on this one? I just purchased service manuals, but still waiting on electrical service manual to find all of the switchs on the transfer case.

TIA,
Ed

 

[volt110]

Update:
Having manuals in hand, I reviewed the relays and switchs. Last item to check this weekend is the plug end at the ECU. Still open to any thoughts? Last experience with our folks at the local Toyota Dealer was $$$.

Ed
93 T4R