ABALONE

Anyone who sits on a good amount of info about the TCU unit in our E55 transmissions?

Whats the name on our trannys? 722.6XX ???

Where is the TCU unit located on the car?

Will a TCU flash/upgrade help the car shift faster?

I need to do something about my tranny. Cause with the bigger MAF house on my car, the signal to the TCU (i guess) is to low causing it to shift quite odd and even slip. And i guess it's due to the lower signal, not worn out cluth packs. Cause it shifted great before the bigger MAF house.

Any help would be REALLY appreciated

// Magnus

AMS Performance

Yes, TCU software does help transmission shift quicker with less slippage in between gears. Are you running screens on your larger MAF? If not then the air will be very erratic which can cause tranny shifting issues. The 722.6 trannies are very sensitive to air/fuels and is the method by which the engine ECU / TCU judge most of its variables. For this reason, when MAFs go bad everything starts running poorly.

ABALONE

Sorry, but what is "running screens" ?

The car also lost all power/torque under 4000 rpm the other day Can i have a bad MAF sensor? I get no fail codes at all when running a fail code search. Shouldn't a bad MAF sensor put a code?

Also i get BAS/ESP warnings. Brake switch or the K40 module? But same there, should pull a code to?

AMS Performance

The stock MAF has two sets of screens in front of the sensor itself. One thick black plastic one with larger openings followed but a smaller thinner mesh wire screen. These are put in place to create proper laminar airflow to ensure accurate reading. When you increased the bore of your MAF did you use larger screens or did you just remove these all together?

Fabio D

Abalone, the EGS in our cars are located inside the black box under the hood passenger side, remove the 4 x screws & you can see a black module with 2 cnectors, remove the 2 connectors & check if you don't have oil inside, is a pretty common issue in our cars, the tranny oil travel by the wires to the module & cause erratic shifts or death module (open the EGS & clean all oil with a CFC cleaner if is required)

Fabio Daniel

ABALONE

AMS --> Ok thanks! I'll have to check if they put a screen on the MAF.

Fabio D --> With EGS, do you mean TCU? I looked today but didn't find any black module?

I'm getting more and more frustated now If i drive the car and shift it "manual" and are in 2:nd gear and floor it without letting it shift to 3:rd (engine break), the 2:nd gear will stuck and i have to stop the car and turn it off/on and then i can shift normal again. Whats this? engine or Tranny related?

Thanks!

AMS Performance

You may be hitting a torque limiter in either ECU. Such is the nature of extreme modding... you run into barriers that are hard to diagnose/determine....

ABALONE

Can you get fault codes from the transmission like you can from the ECU? That would explain or lead me into more info about my problem.

Also found this here --> http://www.w124performance.com/docs/...l_Mercedes.pdf


LIMP-HOME __________________________________________________ _____ YES/NO
Used on EGS systems. This parameter indicates if the ECU or electronic transmission control
module (ETC) initiated the limp-home mode. A fault within the ME system, sequential fuel
injection (SFI) system, traction system, an electrical transmission failure, or a mechanical
transmission failure may cause the ECU or ETC to engage limp-home mode. YES means that
the limp-home mode is engaged.
When you suspect a transmission electrical failure caused the limp-home mode to engage,
look for the following conditions for confirmation:
• The last successful gearshift remains engaged until the ignition key is cycled;
• If the transmission is in 2nd or reverse, after the key is cycled, the torque converter lockup
clutch shuts off while modulating and shift pressures rise to their maximum values.
When you suspect a transmission mechanical failure caused the limp-home mode to engage,
look for the following condition for confirmation:
• After the mechanical fault occurs, the transmission resets itself to 3rd gear. Cycling the
ignition switch causes the transmission to shift normally until the ETC detects another
fault. The transmission again resets itself to third gear, repeating the same cycle

And maybe this can explain the loss of torque/power i feel in the car from time to time?? The "Torque converter clutch" that make the car feel torque less?? --->

Used on EZ, HFM, ME10, ME20, ME27, and ME28 systems. These parameters show
whether or not the ECU is operating the automatic transmission in an overload protection
mode. The display normally reads OFF and reads ON if transmission overload protection
mode is active. In overload mode the ECU disables the torque converter clutch and overdrive.

Fabio D

Ab: Inside the black control module box, Next the ESP-BAS unit you have a little black module wuth 2 connectors, in the white sticker sayd EGSxx this is the TCU, remove the 2 connectors, push upside the black module & they pop up very easly, openned & check if you d not have amunt of oil inside them

Fabio Daniel

ABALONE

Is this the one (TCU)? (NOT my car,found it on the net)

AMS Performance

"overload protection" is the same thing as torque limiter, same thing. You have pushed it past the tranny's internal settings so it appears you need a new TCU tune.

You can completely diagnose, read, reset transmission variables & shifting adaption learning curves through the STAR diagnostic tool (its expensive so usually only the nicest shops will have it). I normal shop or autozone type OBD2 reader won't cut it. Most likely you will have to take it to a dealership or high end benz tuner to have them go through the individual tranny adaption settings & readings to see exactly why its doing it (should tell you indepth for each clutch pack exactly whats going on).

ABALONE

Ok thanks! Hope i can fix this. I'll let you know

ABALONE

Took the TCU down today to see if it had any oil in it,and WOOOOOOOW There seemed to be enough oil in it to cover a oil change in an old tractor

No wonder why my transmission have been playing games with me the last weeks Have a look at all the oil i just tipped out by just turning it upside down -->

jtbeche

HOLY SH*T!!!! That's not good. My car hasn't been shifting weird, but it makes me want to check mine just in case.

Fabio D

Thats all what i'm talking about AB. hope this fix your problem

Clean all the EGS (ELECTRONIC GEAR SHIFT) with a CRC cleaner & if is possible heated with a hair dryer (take care dont burn it)

you can reset the EGS shift adaptation removing the - of the battery one day & night "more than 12 hours" (we have here the star diagnosis to reset the EGS addaptations but you can reset them via removing the neggative. when you drive the car few miles the EGS takes new addaptations

When you put the EGS again you need to change the wire seal conector in the tranny to fix the EGS oiling problem

Edited: i forgot to tell u, i recommend you a tranny flush. Put a new tranny fluid & change the filter too, cause the color of your oil looks no good

Fabio Daniel

ABALONE

Thanks Fabio, it's worth gold

I'm actually going to change the tranny fluid tomorrow. And will do the battery over night to see haw the car acts.

I'll let you know!

// Magnus

Fabio D

Copy hope this help you

I tell u a top secret mod, you can connect the EGS after clean it and put them upside down just in the side place holder with some absorber sponge in the down side, this way any oil comming from the tranny not goes inside the module

hope this can fix your troubles

Fabio Daniel

Marky

Transmission 722636 02 670305

According to the russian site: http://old.mbclub.ru/mb/vin/?lng=eng

Btw, I'm "E55" (Markus) from mbsca.com... Kul att följa ditt projekt här!

ABALONE

Thanks E55

Now my car went into constant Limp mode on 2nd gear. A re-start won't fix it so i can shift I read a bit, and i wonder if i have a bad conductor plate/Speed sensor?

READ post 56

I'm taking the car to a MB shop on Monday to have the codes read. Hope they show whats up with my tranny,haha!

// Magnus

ABALONE

Update: Got a call today from the MB workshop.

They couldn't get contact with the TCU unit with their computer. So i guess my TCU is kind of f*cked up after all the oil in it even though i cleaned it

Next step will be chaning the TCU unit, they will also change the two solenoids in the valve body to the blue top ones like this -->

https://mbworld.org/forums/w211-amg/...roblems-3.html

This will be a last attempt to see if it makes my tranny work fine. Really hope it will do the trick.

// Magnus

Fabio D

Is very common the EGS fail when gets oil inside change them & prove your car before change the solenoids

Fabio Daniel

ABALONE

Fabio --> When they changed my EGS this Friday, they put in a EGS52 version, the older one was a EGS51. They said it was the latest updated version of the TCU/EGS.

But now my car has a small shake/Insecurity when driving really slow near 1500-1800 rpm, the car kind of shakes a little bit?

I'll change the conductor plate to on Tuesday, don't know if it has something to do with all this.

Or if the new EGS52 don't work along with my car since it had a EGS51 before? They flashed it with the latest AMG version software, so i guess it shouldn't be a problem.

Fabio D

All correct my friend the EGS52 is the replace part for the EGS51, but the number of the module need to match the vin number of the car. (are 6 numbers of EGS52) & only one works good for the chassis number, i think your dealer check the part number with the vin before change, but i think it's not normal the shake of the car only with the EGS, in the baddest panorama your car burn the composite discs making spin a little the gear inside the tranny making some shake. but is kind rare.. drive the car some days & keep us posted

Fabio Daniel

ABALONE

I've checked both the old & new TCU/EGS and compared it to the VIN. And there is not a single number on either of them that match the cars VIN And the old EGS51 TCU was in the car when it was new!

Going to MB tomorrow, i'll see what they have to say. I'm also changing to the blue tops tomorrow. Let you know tomorrow!

Fabio D

You would know if the new EGS match the vin number of thr car via EPC, (electronic part catalog) the vin number not comes writed in the sticker, only have the part number & the dealer need to check if it match the car or not.

Let me know what happen tomorrow, but i'm sure the shaking is not caused by the EGS

let me know if you really appreciate any change with the blue top solenoids & please post the part number for this

Fabio Daniel