Tricky ML430 limp mode (wrong front axle speed) - Page 2 - Mercedes-Benz Forum
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post #11 of 20 (permalink) Old 06-15-2019, 05:14 AM
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Quote:
Originally Posted by stalje View Post
I bought the diag tool you adviced me. And it seems to be quite complete thank you.

Here are the specific codes that I read from the ml430 !

C1100 : Unkown
C1101 : Unkown
C1140 : Unkown

C1025-008 : Fault in CAN communication with control unit N47-7 (ABS control module). If no customer complaint exists, the fault can be erased

They are all the fault that come back immediatly after an erase.
Hope they (and you : ) ) will help finding me where is the issue on the car...
It appears that there is a problem with the left front speed sensor. Read highlighted codes in PDF. For now, ignore C1140.

Replace the left wheel speed sensor. Clear all codes and then recheck for those that return.
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File Type: pdf DTC ESP.pdf (87.7 KB, 9 views)
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post #12 of 20 (permalink) Old 06-15-2019, 06:46 AM Thread Starter
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Originally Posted by DrX View Post
You’re welcome.

Did you get it out of limp mode?
no, there are faults that are pending

Quote:
Originally Posted by 43sqd View Post
It appears that there is a problem with the left front speed sensor. Read highlighted codes in PDF. For now, ignore C1140.

Replace the left wheel speed sensor. Clear all codes and then recheck for those that return.
Both wheel speed sensors have already been replaced. The information I gave earlier are still correct : front speed reading is incoherent
However since I have another ML, I can swap a speed sensor, just in case...
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post #13 of 20 (permalink) Old 06-15-2019, 11:19 AM
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Originally Posted by stalje View Post
Both wheel speed sensors have already been replaced.
Here is list of codes and related test. Scroll down to code then hit Test Step.

For wheel speed sensors you are checking internal resistance and insulation resistance. I would like to add third test which is output of speed sensor. Connect meter as for internal resistance, put meter on 20V AC and rotate wheel by hand. Voltage should increase with wheel speed.

STAR TekInfo
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post #14 of 20 (permalink) Old 06-16-2019, 11:22 AM
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In post #1 you said “both speed sensors are new”. Does this mean the previous owner replaced them recently? If so, did he give proof?

If you replaced them, were they genuine MB parts or not? Sometimes it makes a difference.

Whichever, assuming that the speed sensors and the ESP module are good, and you’ve checked the wiring for continuity, then you must have a short circuit somewhere or a bad connection (loose or damaged connector).

Trace the wiring back from the sensor looking for insulation damage (e.g. from rock strike) or just buy new connectors and wire and run a bypass.
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post #15 of 20 (permalink) Old 06-16-2019, 12:26 PM Thread Starter
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Ok... So! I think we are arriving at the end of the story.

Usually, I don't bother about the things previous owners have done. And this time I shouldn't have made an exception :

Both ABS sensors seems to be ineffective :
In fact, I think that they are the other variant W163 received : active sensors.

Here is what I tried :

I removed a fully fonctional ABS sensor from the ML320 which has no issue at all :
I installed it on the ML430 and Magic happened : The fault is not pending any more and can be cleared.

I was not able to swap both side because of course, the second one was sized and broke when I tried removing it.
So I ordered 3 new ABS sensor with the genuine reference that was written on the ML320's abs sensors.

I wrongly supposed that they changed ABS sensors to try solve a previous issue but no... The replacement of the ABS sensors was the origin of the fault !

I'll come back to you as soon as I will have replaced the remaining ABS sensors and, fingers crossed, solved my issues.
Waiting this moment... Thanks everyone for your help !
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post #16 of 20 (permalink) Old 06-16-2019, 01:35 PM
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When you get broken sensor out clean its bore with wire brush and apply thin coat of silicone grease.
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post #17 of 20 (permalink) Old 06-16-2019, 02:08 PM Thread Starter
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When you get broken sensor out clean its bore with wire brush and apply thin coat of silicone grease.
t
that's what I did : )
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post #18 of 20 (permalink) Old 06-18-2019, 10:39 AM Thread Starter
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annnnnnd it's CLEAR :
Tricky ML430 limp mode (wrong front axle speed)-ml430.jpg
Thank you very much to each person that read my topic and even more to those who answered and tried to help me (successfuly).
I now have a nicely working ML430 for 1070€ (70€ : price of the abs sensors).

The Autel MD802 is a nice device that I will surely use for my other cars :
Tricky ML430 limp mode (wrong front axle speed)-img_20190526_182012.jpg

cheers!
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post #19 of 20 (permalink) Old 06-18-2019, 11:13 AM
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Originally Posted by stalje View Post
annnnnnd it's CLEAR :

Thank you very much to each person that read my topic and even more to those who answered and tried to help me (successfuly).
I now have a nicely working ML430 for 1070€ (70€ : price of the abs sensors).

The Autel MD802 is a nice device that I will surely use for my other cars :


cheers!
Next stop -- petrol station
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post #20 of 20 (permalink) Old 06-18-2019, 01:18 PM Thread Starter
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Next stop -- petrol station
That's obviously where I got to
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