jh_guo wrote:
您的車也是 W212 E-class 嗎?
我是212 E300。
快一年了，我是第一次碰到沒電。
再觀察一下，看會不會還是存在這個問題。
如果還會，再想辦法跟上頭反應。
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下文有官方文件提到要如何維修(不用換整顆變速箱, 看起來就是輕輕髒汙及換新油), 之前我曾經研究如何更換722.6的閥體, 看網路上的DIY文章似乎維修並不困難, 722.9也許也差不多. 其他文章則提到為何許多經銷商拿不到conductor control plate/valve body(前面有人提到一顆18765元)乾脆換整顆變速箱. 其他文章也提到Siemens總共出了三個版本的conductor contorl plate, 前期的不能單獨更換, 後期的才能更換...
文章最後所示, 722.9問題一般會發生在50000~60000mile(也就是80000~96000公里), 似乎也吻合多數網友出問題的里程.
PS: 本文存粹是網路搜尋文章分享, 沒有也無法求證, 看的人請自行判斷真偽.
http://mbworld.org/forums/mercedes-tech-talk/426384-722-9-7-speed-transmission-corrosion-issue.html
OK guys, I just got a chance to sit down and communicate what I've learned. Hopefully I can transcribe it accurately. Please take this information as an FYI from which you may choose to take action or not.
-There are many cases of poor shift quality from 722.9 transmissions (as acknowledged in Bulletin number LI27.00-P-051451 Date: 10-03-2011).
-It comes down to particulate contamination inside the transmission which lands on valve screens on the electrical conductor plate attached to the valve body. When the screens get clogged they create speed sensor faults.
-Usually the method for fixing the speed sensor faults is to replace the electrical conductor plate or the entire valve body. However, now that there are so many failure occurrences worldwide, MB will no longer sell these sub-unit parts to independent dealers, and they are even more difficult to obtain for dealerships and are currently back-ordered for dealerships. Thus, typically the entire transmission may be replaced instead.
-Apparently there are now replacement screens available, which can be replaced, if the problem has not advanced too far (I'm not sure about that part).
MB discusses the method for fixing the problem in Bulletin LI27.20-P-051537 Date 11-18-2011:
COMPLAINT:
Vehicle jerks during gear change or has hard or slipping shifts. In some cases the torque converter lockup clutch (KuB) cannot be actuated.
CAUSE:
Torque converter lockup clutch (KuB) cannot be activated due to a clogged filter in the KuB solenoid valve. Other solenoid valve filters, e.g. K1 control solenoid valve (Y3/8y2), may also be clogged with wear debris.
REMEDY:
Removal of EHS & removal of all solenoid valves from the EHS to evaluate the contamination of the solenoid valve filters. Please observe AR27.19-P-0212A. Install repair filter A 221.227.00.00. Clean all valves with a small magnet, afterwards bathe the valves in fresh 134FE-ATF {Blue} (A 001.989.78.03.09) several times to remove debris.
AR27.55-P-0100SX: The entire transmission must be flushed with fresh oil (134FE-ATF A 001.989.78.03.09) & then filled with new oil.
The source of the metal particulates is *possibly* due to corrosion caused from the red fluid.
-Flushing out the red fluid and installing the blue fluid may stop the corrosive process and prevent an expensive failure if it is changed soon enough.
-The blue fluid is backwards compatible with most all MB auto transmissions (722.6, 722.7, 722.9)
-In Europe, MB Service Bulletins say to switch to blue ATF in ALL 7 speed transmissions. However, in the USA, EPA regulations are preventing MB from changing the fluid in older (pre 2010) 722.9 transmissions.
- Most common symptom is that the transmission intermittently won't upshift, i.e., stuck in low gear. Problem gets worse (not shifting at all) and check engine light comes on. This normally occurs around 50k to 60k miles.
Let me know what questions you guys have, I probably left some stuff out during my write-up. FYI, I am having my fluid changed to the blue fluid, and having magnets installed in my trans pan to collect metal particulates.
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