Quote Originally Posted by ericmm
it is A/T. Is it true that if the OD is always OFF it won't shift ot 4th gear? Any suggestions where we can have it checked? We are almost at the brink of getting the computer box replaced.....
Yes, that is the concept. For these kinds of things, the forumers at www.4x4wire.com/mitsubishi are usually helpful.

Be aware that there can be a different control unit for the engine and the transmission.