![]() Luckily the magnetic plug wasn't holding onto anything too big and ugly so although the interval was long, the signs said nothing too bad had happened. It had been a while since anyone had paid attention to this transmission. I changed the ATF, it was brown with a hint of red. Not being one to buck conventional wisdom. There is a oft spoken wisdom about working with flares and hard shifts in the AW55-50SN transmissions no matter what car they are in. it was scary coming out! So, with the help of the MVS gang, I set about the basics to try and recover Sven's trans without replacing it. Driving it in Geartronic (manual shift) Mode helped as you could feather it between the gears going up and shift down at the stops. Additionally some of the down shifts nearly stopped the car and put me up against the belts at times. It ran fine, but had a massive 2-3 and 3-4 shift that if it caught you off guard would try to rip the car out from under you. I picked up a well trod 2003 V70 T5, named Sven. Resetting the learning back to a known set of good values. Those notes are great for the current set up, but they need to be erased and start over when you do something simple like change the fluid. You can read the book, but off to the side, you get the answers the teacher really wants and you get an "A" in the class thanks to Bob, Class of '62! The TCM is always learning and taking notes. ![]() The RA is like a school text book where someone took notes in it. When you do something big to the trans like a new/rebuilt Valve Body, new/rebuilt Linear Solenoids or even replace leaking internal gaskets, you should do a CMA since the "lines" will now be different to the TCM. The TCM (Transmission Control Module) knows about where the lines should be and by going through a series of controlled shifts, it writes the lines that the trans will follow. The CMA is akin to writing new lines on a blank piece of paper. You have a Control Module Adaptation (CMA) and you have a Reset the Adaptation (RA). Let me, before I start into what I did, explain what the difference between the two types of "calibrations" that the AW55-50SN can do. I searched MVS for a deeper explanation for this oft overlooked and somewhat complicated tool to help with big transmission issues but couldn't find anything that really told just how amazing the change that VIDA and this procedure can be! Now. After my recent experiences and discoveries with the loveable slush box we know as the AW55-50/51SN, I thought I would jot them all down for those either having similar issues but finding no joy, or those facing similar issues and wondering what to do.
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