ich poste mal dazu einen Beitrag von xhp, passt ganz gut finde ich und ist durchaus schlüssig (Link
Below you can see a perfect example, why Adaptions are NEVER to be reset on an older transmission. The car in question has covered already above 130k miles and the owner wanted to baby it, by changing the transmission's oil.
Overall a good idea, but after the change was done in his garage, he fired up his laptop and proceeded to do what "the Internet" told him and reset the Adaptions. Now his transmission is dead and ready for the junkyard. (or a rebuild)
What has happened? On each shift the mechatronic uses it's EDS valves to lower pressure on one clutch, while raising it on another. Thats how a shift is always accomplished. One of the 5 clutches closes, while another one opens. For clutches to close, pressurized oil is sent through the mechatronic up into the transmission housing and from there through multiple lines, bushings, sealings until it reaches the piston that actually compresses the clutch-pack.
As on most 6HP nowadays, the transmissions bushings are worn out and do not seal as good, as they used to be. This means a part of the pressurized oil does not reach the clutch piston, but spills out before and returns to the sump. The closing of the clutch is delayed and uneven. For a smooth shift to happen, the opening and the closing clutch have to be controlled very precise within millseconds! This process is monitored by 2 sensors at the trans input and output, which are able to detect minimal deviations from the planned optimum.
Those sensors are actually used to optimize the shifts over the whole lifetime of the transmission and (thats the important part) to correct for wear and tear inevitably happening during operation. On the trans in question the Quickcharge Time for the E-Clutch was already raised by a lot, due to the loss of oil in the actuation line. The Quickcharge Time is the time the clutch pack has to be pre-pressurized, before it starts to build up friction and transmit torque.
By resetting the Adaptions the slowly (over 130k miles) learned Quickcharge Time for the E-Clutch got lost and the clutch is now in serious delay compared to before. The effect is that the Offgoing Clutch is already opening, while the Ongoing-Clutch isn't ready to transmit torque. This leads to an "impossible" ratio between the Transmissions input and output speed and the trans controller shutting down operation to protect the trans from further damage.
As the trans will never be able to complete this specific shift, it will never be able to re-build it's Adaptions. The only way to restore it, is to dissassemble it fully and rebuild it. Usually buying a used 6HP is a lot cheaper, than rebuilding it.
Thats the very reason, xHP does not offer a function to reset Adaptions. In 99% of the cases it is not only unneccessary, but dangerous unless you know what you are doing. Just leave your Adaptions alone, they are there for a reason.
