Transmission Issues - Mercedes-Benz Forum
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post #1 of 72 (permalink) Old 03-06-2019, 06:30 PM Thread Starter
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Transmission Issues

Hi Gents,

What would be your thoughts on this issue?....
I occasionally tow a 2 ton Trailer. On the Freeway claiming up hills I often have to manually change down (D to 4 or 3) to avoid slowing down to much. But after completing the hill climb I put it back into Drive but the Transmission will not change back up into Drive until I pull over and let everything cool down.
Do you think a Tranny oil flush will cure this or is this an indication of bad things to come?

Many thanks.
Neo
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post #2 of 72 (permalink) Old 03-06-2019, 10:20 PM
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Checking the oil wouldn't be a bad idea. One question, does your low range motor work? You should have codes in the transmission module by now, can you have it scanned?


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post #3 of 72 (permalink) Old 03-06-2019, 11:18 PM Thread Starter
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Thanks Noetico,

Oil's at the correct level but looks a bit black.
Low range works fine.
I have a Snap-On ETHOS Scanner (I didn't think of scanning the codes lol!) and here's the relevant ones
it came up with ....
P2502 Gear Implausible Or Transmission Slipping
P0500 Vehicle Speed Signal. The CAN Data Are Invalid

Any thoughts?

All the best.
Neo
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post #4 of 72 (permalink) Old 03-07-2019, 12:03 AM
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Transmission Issues

Ok, so that sounds like a conductor plate issue. Does the snap on read live data? If so, check the speeds of the sensors as you drive, y3/6n2 is usually 0 and y3/6n3 should be making good rpms, y3/6n2 should show rpms when you idle - or reverse(if I remember well) - within the range of the engine rpm depending on your current gear, If you find some extremely high and impossible rpms there, then that could certainly point you to the conductor plate.

Start with changing the oil and filter and see how that goes, you can always neatly remove it to very clean containers and reuse if you finally need to change the conductor plate; it should still be fine..




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Last edited by noetico; 03-07-2019 at 12:06 AM.
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post #5 of 72 (permalink) Old 03-07-2019, 04:36 AM
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Some correction, had to plug in the scanner while heading out to confirm those readings... The speed sensor 2 and 3 should show almost synchronized rpms, based on engine speed... If you find any reading going in 10k multiples then that's a flag.


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post #6 of 72 (permalink) Old 03-07-2019, 05:32 AM
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I would take a look at live data for fluid temperature. You may have inadequate cooling for the load you are putting on it.
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post #7 of 72 (permalink) Old 03-07-2019, 09:24 AM Thread Starter
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Thanks noetico. Will check on live data for Transmission... not sure the ETHOS does that.

Quote:
Originally Posted by Witek_M View Post
I would take a look at live data for fluid temperature. You may have inadequate cooling for the load you are putting on it.
Thanks Witek, will try and check that too .... Although towing has been great these past three years, but I guess the older the oil gets the greater the temperature.
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post #8 of 72 (permalink) Old 03-07-2019, 01:35 PM Thread Starter
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Ok looks like the ETHOS does Tranny "Speeds" in one menu which has "Turbine Speed (RPM)", "Vehicle Speed Front Axle (Km/h)"and "Vehicle Speed Rear Axle (Km/h)" ... Will these do?.... It also has Tranny Oil Temp in another menu.
I drove the car this morning (no trailer attached) and all seems fine at the moment so I guess this issue is going to be Oil Temperature or Load dependant?
Will do some road tests but one way or the other if I'm going to flush the oil I may as well do the conductor plate at the same time. I noted on some 722.6 Tranny ("Change conductor plate) Youtube videos they change the conductor plate as preventive maintenance and it looks like a job I can cope with

While I'm in there would it be wise to replace the Solenoids too?


Many thanks.
Neo
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post #9 of 72 (permalink) Old 03-07-2019, 02:17 PM
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Ok front and rear axle speeds are read from the wheel speed sensors.
You could do it torque bolts at 8Nm. Solenoids, may be worth it since the car is doing some heavy duty stuff (great car lol).

If this is temp dependent, you are very spot on with the fluid. Which will you use?


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post #10 of 72 (permalink) Old 03-07-2019, 06:55 PM Thread Starter
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Ok. So on todays 2 hour drive the Tranny oil got up to only 80degC (176degF) and there was no issues. Even on a steep hill climb where I manually changed down and back up again.

Would that 8Nm tightening torque be for the Ali Shift Plate bolts or the Solenoid Bolts?... or both?

Have ordered 20 Liters of Fuchs Titan ATF 4134 (It's as "Rare as Hens Teeth" around here!). I used about 12 liters last time but this time I'm going to keep flushing until I see bright red!!

Anything else I should be looking out for?... Will probably start this job in 2 weeks time.

Many thanks.
Neo
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