722.6 ML320 Transmission replace gilly help!
 

I have a 2000 ml320 that I bought wrecked in the front with only 6K miles on it. I got a great deal and replaced the front cap and now my wife has been driving it. We have 36K miles on it now and it went into limp home mode. I took it to the dealer here in north houston thinking that only a sensor had gone bad causing this. The dealer tells me 6700.00 to replace the transmission and the trans controller, it is shot. She said that the adaptive has done all it can becuase the transmission has been slipping and the memory is full so the brain has to be replaced as well.. We never really noticed it slipping, occasionally 4 or 5 times when putting into reverse it would still be in nuetral then after a minute it would go into reverse. This only happened a few times. Am I being taken? I have a friend that has a wreking yard in FLA, He is selling me a 02 trans with only 2k on it for 1400.00 and my brother in law haqs a shop and will do the installation. What else will I have to do besides having this new trans installed. Do I need a new brain, programming, I don't want to get too burned.

36K is a very early failure for a 722.6. I would want to see a print-out of the adaptation figures from the trans computer!
Maximun torque figures for a V-6 engine is 180nm.

You don't need to program any computer if it is from a LIKE vehicle.

I will ask for the printout this morning and also a copy of the estimate. I figured that if you diconnect the battery the memory to the computer would be cleared, so why would you have to have a new computer as well. This was my fist clue that maybe something is fishy. I will post the printout today.

new adaptive data from shop please read and remark
 

code 2 and code 98 stored on trans control module shift soleniod valve sproatically faluty and code 2 shift soleniod valve faulty these are stored codes
P7053 read fault memory of control unit ETC

The above are the only codes... below is adaptation info
ETC Adaptation data
01 Accel 1-2 -9 51 02 Accel 2-3 84 105
-18 -78 -3 -6
-3 -6 -9 18

03 Accel 3-4 27 42 04 Accel 4-5 -78 63
-9 -27 -21 -60
-12 -60 15 12

05 Decel 1-2 -9 0 06 Decel 2-3 -48 -18
07 Decel 3-4 -33 -15 08 Decel 4-5 -72 -18

09 Accel 2-1 -51 -114 10 Accel 3-2 12 -129
-15 0 -66 0

11 Accel 4-3 -27 9 12 Accell 5-4 -6 -168
15 -6 -180 0

13 Decel 2-1 3 0 14 Decel 3-2 12 0
0 0 3 0

15 Decel 4-3 0 0 16 Decel 5-4 9 0
3 0 12 6

17 Fill Pressure 1-2 -600 mbar 22 Fill time B1 in 0 cycle
18 Fill Pressure 2-3 -400 mbar 23 Fill time B2 in 2 cycle
19 Fill time K1 in 2nd gr 5 cycle 24 Fill time K1 in 4th gr 2 cycle
20 Fill time K2 in 8 cycle
21 Fill time K3 in 4 cycle

turn off limp home mode temporalily 4 hours max
 

Is there a way to disable the limp home mode so I can get it to the shop to get the trransmission changed?? ML320 722.6

I'd base almost 100% of a transmission replacement diagnosis on what's in the bottom of the oil pan. I have an earlier post about this topic.
No you can't just "shut off" the limp home mode......if it were only that easy! Why do you think that limp home exists? Why would they have this feature if you could simply "turn it off"?
Going by the codes I'd more lean towards a bad solenoid, but I would think the place that looked at it would have mentioned that. But both of the codes are essentially the same, just 1 is sporadic and one is a current code, but the same fault really. You could try finding the bad solenoid, but another possiblity is a bad conductor plate, they were still having problems with the conductor plates in 2000.
Sometimes when replacing the transmission (if it comes to that) MB recommends a new ETC (control unit, or as YOU like to say the "brain"), but the persons logic that "the 'brain' is full" is a bunch of hooey, I don't know if I'm likin' what this guy has to say at all in regards to this problem. Doesn't sound very well versed in transmissions in general and the 722.6 in particular.
I'll have to dig out a book to analyze the adaptation values, ain't happenin' tonight anymore, possibly tomoorow. I'd proceed with caution with this clown.......
Gilly

Here is a link to the thread I mentioned in my previous post:
http://www.peachparts.com/shopforum/showthread.php?t=102541&highlight=722.6+life

Gilly

Please if you can look up the adaption values and tell what I need to do I would appreciate it. The want 6700 dollars!!! I just can' t believe this.

refuse to pay them 6700 for new transmission
 

Gilly, read your thread on no service for 722.6 already. The stealership could not give me a reason why it is 100% toast despite my repeatedly asking. They just kept saying 6700 and we will fix it for you. They also charged me 152.00 to tell me this. I still don't really believe them and hopt that either you or MB doc has the tiem to look up the values that they gave me. I really think it is just teh soleniod and they wnat to sell a transmission. I did however buy one already, see earlier post becuase I can'et it down too long but I refuse to pay them 6700 to do the work.

Dan, thanks for taking the time and effort for posting this!! It points out something I've never found a clear answer for, and here is the question: If you were to remove the build up of debris that is in the pan, and I’d guess to a lesser extent suspended in the oil as well, wouldn’t cleaner oil slow down the rate at which the parts brake down? Don't the filings contribute to the rate at which wear occurs?

Also, the MB comments strikes me as unnecessarily innocent from a manufacturer. I’d think they could reverse engineer, or measure the wear and calculate between the wear and the original specs, to show how and what variances of the design influence wear and tear. From this you’d think they could really design valves, bearings, solenoids and so forth so they would last 200K miles or even 400K miles. You'd expect they can tell which elements wear more quickly, and from that basis, determine design tolerances to facilitate greater longevity....

Tracy and tthorne
I read your posts, i have to get going to work now though, I'll try to get back to you both tonight.Maybe Doc can get info on the adaptation values, if not I will try to do that tonight.
Gilly

ON the shift adaptation screen under live data there is a torque spec in Nm. ON a V-6 engined trans the max reading is 180Nm+-(plus or minus figure).

All I was given was the 24 adatptation values that I posted and the 2 codes from the Trans cont modules
code 2 coponent Y3/6y3 (1-2 and 4-5 Shift Soleniod valve is faulty) stored
code 98 coponent Y3/6y3 (1-2 and 4-5 Shift Soleniod valve is sporatically faulty) stored
code PO753 Read falut memory of control unit

this is all they gave me. the truck runs fine smooth as top. just wont come out of limp mode without payning them $6700 to replace the transmission and control module becuase the memory is used up "quote"

If you look at the adaptation tables that you posted you will see the only figure at -180 is the 5-4 shift table. That should not keep the trans in limp mode, BUT the code (2) for the solenoid will. You need to replace that solenoid 1st. MB number 140-277-05-35 OR 240-270-01-89 with a list of $27.50.

soleniod
 

How will I know which I need Component Y3/6y3 is the one on the printout.. Is this easily replaced ? I took out and reinstalled the engine and transmission myself when I rebuilt the wrecked front end. If the soleniod is an exterior part on the trans and can be replaced without pulling the unit I will like to do it. I assume that there are 2 soleniods from your post. I assume that this is not too difficult to do with a 30 dollar part.