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I have almost for a year now the faults lighting in the instrument cluster: ABS,ESP,BAS and Brake lining wear. For the first thing i have replaced the brake light swich, but this did not make any difference. What more can cause it? Is it possible to test the ABS control unit somehow? It is a pretty expensive part to purchase if you don`t know if the issue is 100% there.
Note, the error codes are like a blood test and xrays. They often give a very good idea of the problem area. But, there are times where they give only a hint.
Your choice of the above.
Oh wait, there is a #5...
5) Replace random things and hope that fixes the problem.
If you have an error code, then post it. Someone may be able to help with what may be the problem. Again, the error code does not always point to the exact problem.
Actually I haven`t written down the fault codes from the last reading, it was about 8 months ago, the diagnostic tool was also not a very good one i think. How to check if the problem is in the ABS control module? Is it possible to repair the control module?
Actually I haven`t written down the fault codes from the last reading, it was about 8 months ago, the diagnostic tool was also not a very good one i think. How to check if the problem is in the ABS control module? Is it possible to repair the control module?
The item in #4 above (~$200) can read the MB ABS error codes and show real-time data.
It could be many things.
It could be a tire low on air.
It could be a bad ABS sensor.
It could be a broken or loose wire.
It could be a bad main unit.
Etc...
Each problem costs a different amount to fix. The cost will also vary depending on where you have the work done.
A dealer will only replace a bad ABS main unit with a new unit. That's expensive. Many local mechanics would consider, and likely suggest, a used unit. That's much cheaper, and their rate per hour is also often ~1/2 the dealer.
The free thing to do is to check the air pressure in each tire, and add/remove air pressure as needed. A tire low on air pressure will trigger an ABS error, since the difference between the tire diameters is not within the requirement.
Also, you must have the stock rims and tires sizes. If not, the tire's diameter difference (if running staggered widths) must be with ~~2-3% of the stock diameter difference. The diameter of the tire *varies* by rim, tire size/width, tire manufacture, tire type/model, and even the year the tire was made.
Fwiw, in general, giving enough money and time, "anything" can be fixed.
I mentioned in another thread how my 2005 C230K has a great body/interior/etc. But, needed some engine work. For me, that was easy.
On another car forum, someone is taking a car that imho looked liked a rusted POS worthless junk shell, and is making the car look better than new. That person also happens to be very good and very capable (all of the tools, and plenty of experience) to do body work, interiors, etc.
So again, the "worth/cost" of fixing a problem varies for different people.
Check for water/corrosion in the ABS connector on the distribution block. That is what caused those errors in my car a few years ago. Had to replace the computer.
Checked the connector 2 times, everything is ok and cleaned there.
Today I have got the fault codes readed with two different devices, some Delphi device and also with the Launch device. The Launch device did not let read the ABS fault, but the Delphy did. It seems that there is some problem with the control module or some wiring? It seems that there is nowhere in Estonia currently no replacement with the current code available. Would it not be possible to repair the control module by myself? I am familiar with soldering devices, but I have heard, that some modules are not repairable? Can there be some cold solder joints in some solder joints etc? Does anyone has some experience with repairing it by himself?
What do you mean? Check for corrosion? I have checked this and everything is ok, i think i can`t check anything else and how do i check the ABS sensors, does it even make sense, since according to the diagnostic there is something wrong with the control module.
Checked the connector 2 times, everything is ok and cleaned there.
Today I have got the fault codes readed with two different devices, some Delphi device and also with the Launch device. The Launch device did not let read the ABS fault, but the Delphy did. It seems that there is some problem with the control module or some wiring? It seems that there is nowhere in Estonia currently no replacement with the current code available. Would it not be possible to repair the control module by myself? I am familiar with soldering devices, but I have heard, that some modules are not repairable? Can there be some cold solder joints in some solder joints etc? Does anyone has some experience with repairing it by himself?
You can not fix the ABS module yourself.
You must fix the CAN bus errors first.
Otherwise, just send me the money you would've wasted replacing things that may or may not be bad.
Disconnect/bypass the modules on the bad CAN bus, one by one.
Check for videos or threads on how to do that.
Before you worry about the ABS module being bad, you must also need to fix the brake signal error. That may be part of the CAN bus fix.
I'm pretty sure that for W203 platform, as long as the ABS module numbers match *EXACTLY*, then it's just a removal and replacement.
So, no "SCN" coding and Dealer tool needed.
You must fix the CAN bus errors first. - How?
Disconnect/bypass the modules on the bad CAN bus, one by one. - How?
Check for videos or threads on how to do that. - Haven`t found any videos how to do that, but have not found any single videos. Would it be possible, to describe a bit more precise, how i can check/perform the things listed above?
CAN you actuate the return pump motor?
Are all the main supplies and grounds good?
Is it the large ESP unit type?
Then renew ECU. It's a known issue!
From your answers in previous posts i agree this is beyond
Your knowledge of diy. Take it to a professional
Replaced today the Control unit with a new used one and still same issue, is there some kind adaption etc needed for it? Then new Control Unit has the same part number as the previous one had.
Last edited by RagnarMärts; 04-03-2017 at 05:47 AM.
11-04-2016, 01:53 PM
