ANSWERS: 4
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The only answer I can give you, is of the same prob I had years ago with my first Automatic car that wouldn't change gears. Climb under it and see if any vacume hoses have become loose or disconected. That solve my prob.
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I'm leaning toward the TCU. The D4 light was constant-on (regardless park/reverse/neutral), so last night I disconnected the battery, and everything went back to normal; tranny shifted through all gears fine, so I'm guessing not likely anything internal. I only drove it a couple of miles though. This morning the light was back on, and it was in a fixed gear again. However, this time it allowed me to manually shift into 1st, and all the other lights came on with their respective gears, even though D4 remained on as well.
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Update: I opened it up, and the board looked clean. All of the other symptoms were there though, so I ordered a reman TCM. That solved my problem, but now I has some odd new symptoms - revlovling around harsh, late shifting. The new D4 light isn't coming on at all now either, so I'm going to send it back for another. At least I know now that the innitial problem was indead the TCM.
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Sounds like you have a short that is causing the problems in your Tcu.
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