Thee is a relay under the dash that you need to replace. Had this problem with my 93 Honda. I believe it is the Main Relay Assembly. Hard to get to but I have small hands and was able to get under the dash on the driver side and get it out and replace it. The chances of having 3 bad TCUs is highly unlikely.
SOURCE: Transmission shudder
I had a similar problem on my 93 Accord after I accidentally threw the car in reverse at 50 mph, obviously wrecking the transmission. When I got it rebuilt I was told the transmission pump was to blame (clogged with "shrapnel"). I, and your car manual, recommend taking the car in to get the tranny looked at. Especially considering you just had the fluid changed which is what would normally cause the problems you are describing.
SOURCE: where is the tcu in a 2002 honda accord
it is the Transmission Control Unit. you have to find the reason why the TCU is flashing the D4 fault code. not replace the unit. have your vehicle scanned for another code. your transmission or transaxle is giving you a warning that something is wrong .
SOURCE: had a used trans. put in my 92 honda accord 2
your transmission has external shift solonoids towards the front one is for 2 gears and the other for the other two i believe the lower one is the one you want ot replace they rust up and start binding inside.
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