4wd ECU Problem?

So i've been dealing with issues for my 4wd for awhile now. At first, I thought it was my front diff actuator, bought a new one and cracked the old one to find that the connection points to the motor had came off. After installing the new one it didn't work as well. Thought it was a dub piece so fixed the old one and tested it and it worked, so I reinstalled it. Still doesn't work, but checked the voltage on the harness connection the actuator and was not getting any volts.

Could the problem be the ECU? How should I go about checking it?

 

UPDATE:

So, I followed this 4wd ecu diagnosis and found that some of the terminals were sending volts although they should've been closed. I will probably need a new 4wd ECU.

This is the Diagnosis:
http://alflash.com.ua/avtovideo/4run/T-TT-0047-104WD System Diagnosis.pdf