How to open ECU (Bosch 0 261 200 608) - Mercedes-Benz Forum
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post #1 of 13 (permalink) Old 02-25-2016, 09:34 AM Thread Starter
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How to open ECU (Bosch 0 261 200 608)

Hi,

we have MB E200, y.1995, engine type M111.940.
Car started to shake, no warning dashlights were on. Drove car to MB repair service and they said that ECU is malfunctioning. 2 cylinders are not working. They switched wires of 1st&4th cylinders for 2nd&3rd and they said all are working. So ECU is not working as it should.

I can not find how to open ECU, to try to repair it. We will try to repair it because our dealer wants 1200 for new ECU.

I did try to open it with force, but it did not work. I have also drilled rivets on back side, but it does not fall apart. Also i can not get knife between metal and plastic part to open it.

Here are some pictures and data:
Mercedes part number: 018 545 10 32
Bosch part number: 0 261 200 608
SW 4493

Here are pictures:






Any help is welcome.
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post #2 of 13 (permalink) Old 02-25-2016, 10:51 AM
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Before condemning the ECM, are you absolutely sure your symptons are not being caused by the dreaded eco junk wiring these cars came blessed with??? All your symptoms seem to point to it.

Verify the engine harness and throttle body build dates. Only harnesses and throttle bodies made in 1998 or later are eco junk safe.

The ECM are very rugged and usually only die due to electrical shorts (in harness and/or throttle body).

The ECM itself is not serviceable and drilling holes in it will only hasten its demise due to dust, dirt and water exposure.
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Last edited by sbaert; 02-25-2016 at 11:09 AM.
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post #3 of 13 (permalink) Old 02-25-2016, 11:06 AM
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One more thing, before anything else install a new Bosch voltage regulator, new OE MB or KAE(hler) OVP relay and a full set of updated copper core ceramic fuses. Easy and cheap do it yourself fix.

Ditto on a new top spec battery if your current is over 4 years old or more.

These cars are hypersensitive electrically speaking.
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post #4 of 13 (permalink) Old 02-25-2016, 12:03 PM
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that module is the ICU isn't it? (ignition control unit) I'm not real familiar with those m111 engines, so...


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post #5 of 13 (permalink) Old 02-25-2016, 01:36 PM Thread Starter
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i can put a lot of pressure on plastic cover this label (first picture) and it separates from main body, but something is holding it positioned under right side of bar code (first image). I have seen few pictures in ebay and google images, that serviced units are glued in U shape around label.
sample from current ebay listing :
http://i.ebayimg.com/images/g/F30AAO...aw/s-l1600.jpg
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post #6 of 13 (permalink) Old 02-25-2016, 01:42 PM Thread Starter
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@sbaert , thanks for answers but i'm not car mechanic. I do have basic knowledge and skill for repairing electronic parts, but i don't understand what are some other phrases you have used. Especially where to connect "new Bosch voltage regulator, new OE MB or KAE(hler) OVP relay".
Also i dont undestand this part:
" Verify the engine harness and throttle body build dates".
I will try to check cables myself due electrical shorts.
I'm also searching for partnumber of engine harnesses that connects ECU and engine. I don't have access to EPC to check it and see what cable i have to disconnect.
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post #7 of 13 (permalink) Old 02-25-2016, 01:54 PM
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OE MB = original equipment mercedes benz.

KAE(kaehler) is the maker of many of the relays Mercedes relabels and are good quality alternatives often available cheaper than 'real' mercedes OE parts.

OVP = overvoltage protection relay, this is a square silver relay with 1 or 2 'blade' fuses under a clear plastic cover on top, located in the electronics bay behind the battery. they are prone to failure with age, and cause all kinds of problems if they have failed.

the main engine wiring harness has a date build sticker on it near the main electronics bay behind the battery. the harnesses used on 93-97 mercedes were made with 'biodegradable' insulation, replacement harnesses from 1998+ use 'good' insulation.

the throttle body, mounted on the intake manifold, also has a build date, and these electrically controlled throttles are also prone to bad wiring, replacement throttles that are 1998+ are 'good'.
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post #8 of 13 (permalink) Old 02-26-2016, 03:14 AM
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Originally Posted by t7ank View Post
@sbaert I do have basic knowledge and skill for repairing electronic parts,
With respect, sir, a basic knowledge is unlikely to be sufficient to diagnose and repair an electronic controller like this. If it is faulty, far better to search for a working 2nd hand unit.

As said by others, these units are robust and it is far more likely to be related to the OVP, the 12V supply or the wiring.

I strongly suggest you establish a relationship with a good Mercedes independent specialist and sever ties with the main dealer.

Just my 2c worth.

Good luck.

RayH
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post #9 of 13 (permalink) Old 03-03-2016, 06:08 AM Thread Starter
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I have option to get same part number ECU, but it has different SW number.
My has SW 4493, other ECU i would liek to buy has SW 0295.

What is the difference?
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post #10 of 13 (permalink) Old 03-03-2016, 01:15 PM
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I'm gonna guess the only difference might be the build date???

Example: SW 0295 = SW WWYY = 2nd week of 1995
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