Snogard

My E55 is early 2003 wich had early version of 722.643 transmission (brown top selenoids) with Mercedes number ID 2302700100. Since tranny was starting to slip, i swap it with low milage new version (blue top selenoids) 722.643 tranny with Mercedes number ID 2302700700.
Now my question is should i go to the dealer and flash TCU with latest firmware or is that not necessary? Because since i have new tranny in a car, i experience slightly hard downshifts from 2-1 and sometimes 3-2 (when coasting down to stop with no throttle applied) and slightly hard upshifts from 1-2 with very low throttle applied. Before tranny swap that does not occur. And yes, i have done sneeky ECU reset and also i have done tranny adaptation according to WIS (4xgoing thruu all gears with low torque input and never exceed 1800 rpm), then idle for 10 minutes so TCU can store adaptations.

So do i need TCU latest reflash? Any other advice?

Thanks folks!!!

E55Greasemonkey

722.6 Trans ECU is not flashable. The most the dealer could do is reset the shift adaptations and give it back to you, it will relearn as you drive. Also, make sure the fluid level is correct. If the problem goes away soon after the adaptations are reset, but then returns sometime later this may indicate you need a new trans ECU.

Snogard

Hmm...as far as i know some of the members actualy did TCU firmware update at the dealer succesfully.... I guess only way to know it for sure if our TCU is flashable is go to the dealer myself...

P.S.
Is new TCU somekind different? Different software? Or why do they swap TCU if old one is good?

vioilio

Just clear the adaptations of the new transmission via STAR or use the search function and you can do it manually without software. This should take care of the hard shifting.

Snogard

Manually without STAR? I thought that is not possible to clear the adaptations other way than with STAR?? Disconecting battery or sneaky ECU reset does not clear tranny adaptations. Is there any other manuall way to clear it?

lowprofile

The symptoms you are describing are the same of those who swapped from brown to blue top solenoids. The simplest solution would be to swap a set of brown tops back into your new trans.

Snogard

Actualy, reset TCU adaptations with STAR did the trick so tranny is silky smooth now

In the matter of fact, the first generation of tranny (with brown sel.tops) is not even selling any more. So if you have early 2003 E55 with brown tops and tranny goes south, and you buy new tranny from mercedes, you will get new generation 722.643 with blue tops. And all that dealers do after the phisical swap is reset tranny adaptations and trannys are working like they should.

Those people who have tryed to swap brown top selenoids with blue top selenoids have troubles with hard downshifts because in newer generation 722.643 tranny (with blue tops) not only selenoids are different, but valve body and other stuff also. So if you wont blue selenoids to work without hard downshifting, you should swap much more internal parts in old style 722.643tranny to make it work properly.

Schreiber242