It seems that we'll have to respectfully agree to disagree with each other for now. I'd already downloaded everything I could find online on the topic, including the EndWrench items you thoughtfully provided links for. Unfortunately, not one gives descriptions of the 7 shift maps that the '99 Phase 2 trans uses. Even the "4EAatPh2Win04.pdf" article is incomplete, since it neglects to mention the torque converter lockup inhibition that occurs in addition to the 4th gear lockout when cold.
Also, the same article lists "Faulty shifting when cold" as a consequence of ATF temperature sensor trouble (see "Self Diagnosis" table). It isn't specific as to what fault(s), unfortunately. I have read elsewhere (although I can't find anything quotable at the moment) that the delayed/raised shifts when cold are implemented to warm the engine and emissions-control systems (including the catalytic converter) faster in order to cut emissions. If indeed that is the case, I have no problem with it; I'd just like to be sure my trans isn't thinking things are colder than they really are.
look I didn't post just to argue with you but trying to help. I don't know why you are so defensive, but hey, its your car.
Let me try one more time before I give up.
The delayed/raised shifting you mention was indeed used in subaru AT in the past. It is called KDLH (kick down low hold) and is intended to make the engine warm-up quicker for emissions. The fact you failed to mention that it was used in old trannys without electronic control. I has not been used in more modern 4EAT.
See the phase1 description page 8:http://endwrench.com...EATPh1Win04.pdf
The phase 2 dosn't mention it alltogether and there is no reason to consider that KDLH is used in gen 2. Again, my tranny doesn't have it.
"Faulty shifting when cold" sounds very vague. I would venture to say that you do have faulty shifting when cold.
Why dont you get a new temp sensor, put it in a thermos with warm water, wire it in to the TCU and see if shifting improves? Then you can also compare the resistance with the stock one.