I command you to crawl! - Mercedes-Benz Forum
 
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post #1 of 6 (permalink) Old 05-22-2019, 12:30 AM Thread Starter
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I command you to crawl!

Anyone lift weights and watch CT Fletcher?

I'm gettin pretty annoyed with this AWD system and it refusing to negotiate off-camber 3 wheel situations. I try to get it to simply crawl up an 8 inch rail road tie and it gives up flashing the center hazzard light and beeping at me while cutting all power to the front end.

HOW IS IT DOING THIS?

As far as I can tell by looking at pictures of transfer cases and diffs already removed, the only electrical piece involved is the low range selector. Mine works. Goes into low range just fine. Wont do shit with the power when I want to climb things like a crazy person but will spin all 4 if I hammer it on a loose surface.

I tried cheating the system and while it was beeping at me, I slowly engaged the parking brake to stop the spinning whee in the rear. Once I stopped it, power returned to the front wheel with least resistance so I still went nowhere as it had now cut power to the rear all together.

At this point I need to know if when this is happening, am I loosing power at the t-case or the diffs. Only way to do that is have a trusting friend crawl under the car while I piss off the traction control system and tell me if both front and rear drive shafts are spinning. I'm new to MB but have built a few Toyota rock crawlers. I swapped to a 5spd manual trans and t-case on my 97 4Runner and that messed up the way I had to engage 4wd as before it was just push button and that engaged the t-case and the front diff. I found that with the manual t-case when I selected 4wd, that would engage only the front drive shaft but the drive shaft was not yet engaging the front diff because the front diff needed a vacuum solenoid activated to move a fork over that locked power from drive shaft to the diff. This seems much simpler than all that as it if full time AWD with a certain percentage of power going to the rear and the rest to the front.

So what the hell is disengaging when the traction control system freaks out? There is no violent clunking or anything that would suggest part failure or harsh gear engagement.

Whatever computer fancy pants bs is going on, I'm going to figure out how to override it when I want to. I can deal with open diffs and 2wd but not a 1 wheel wonder.

Can anyone save my friend from laying on the ground by shedding dome light on this subject?
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post #2 of 6 (permalink) Old 05-22-2019, 01:48 AM
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The second generation of 4Matic was reintroduced on the W210 series in 1998/1999. Available only with left hand drive, the cars were again manufactured at the Magna-Steyr plant in Austria. The second generation of 4Matic utilized a full-time 4-wheel drive system with three open differentials front, centre and rear. Traction control is achieved using ETS (Electronic Traction System). This employs the ABS system with additional valves to monitor and then partially brake any wheel which loses traction. This much simpler system is also featured in the Mercedes-Benz M-Class SUV.


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post #3 of 6 (permalink) Old 05-22-2019, 01:58 AM
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You won’t be able to disable the system without causing the vehicle to go into limp mode, and what ever other problems it will cause disabling it if you even can.


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post #4 of 6 (permalink) Old 05-22-2019, 01:10 PM
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Try to avoid the eight inch rails !!

Man, you've got a ML that is 18 years old and you expect it to climb and descend Mt. Everest?

Sounds like you are very knowledgeable with traction systems and four wheel drive setups, but your ML is not a state-of-the-art 2019 G class ! Enjoy the ML for what it is and its huge capacity, excellent road manners and SAFETY .......good luck with the project..keep us posted !
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post #5 of 6 (permalink) Old 05-22-2019, 05:09 PM
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Something is still not right, regardless of the age. Your ML has 4ETS+ which should be able to move the vehicle when only one wheel has traction. Of course if the at wheels with traction are wedge against something and there's not enough engine torque to get over it, then you're stuck.

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post #6 of 6 (permalink) Old 06-01-2019, 12:28 AM
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I don’t struggle for traction https://youtu.be/qCdAoyjwZ7Q
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