General Category > ABS related issues
No response from controller r1200cl 2004
WayneC:
Look at posts by Jughead he has considerable experience with ABS, while I have experience on other ECUs, there was a US Co repairing some as well
mayojuaf:
Wayne, yes, I just reviewed all posting from Jughead. He is indeed the Master of the Universe on ABS matters.
I will try to contact him via private message but in the meantime I have a GS911 question.
My GS911 tells me he can not communicate with the controller. Is that an electronic issue more than a pump problem? If something was stuck or it had not enough pressure, it will give me the error code?
Is the electronic board the problem?
I understand the servo is not running so the IABS is not completing a check and so all light are on etc, but is the message "no response from Controler" mean the GS911 can not talk to the circuit board?
Autoscan does recognize de ECU and runs but when you chose the abs option sends the message of not possible to communicate...
WayneC:
Yes the fact the GS911 is unable to communicate with the IABS indicates the possibility that the electronics board in the ABS unit is faulty, the other possibility is that the ABS electronics has not initialised fully due to a mechanical/hydraulic fault and is in effect in a wait state
From memory the Autoscan you posted did not show the ABS ECU, only the Motronic ECU
mayojuaf:
Today I disassembled part of the IABS modulator. Took out te pressure valves? to see if they were stuck. Also took out the filters (one of them was very dirty) clean the best I could (swallow some brake fluid but not tat bad :))
I bled again the system thoroughly, wheel and control circuits. Fluid was fine but still flush it to get fluid running...(first time was somehow dirty)
So, the good news is that when I take it to the dealer and if he says the IABS module is shot, I will believe him ...
maybe they do some magic and is NOT the IABS... (i have always been an optimist)
all that have responded my call for help, thank you for helping me here. I learned a lot.
I am not sure I am ready to bypass the servo as I have not seen instructions for a R1200 cl . Only for GS or R?
If someone has seen these CL instructions somewhere, please let me know?
Thanks again
and if you are going through Houston, send me an email and will be glad to invite for a drink!
mayojuaf:
I am obstinate as a mule.
Continued digging and found this on the car's troubleshooting forum. Is amazing but now not surprising BMW uses similar (similar, not identical) strategies in ABS for cars and bikes
I found the following when looking for no abs,no speedometer, no cruise control and all lights on...:
SUMMARY:
The problem is usually a single wheel sensor goes bad (wires or the <$100 sensor), or the ABS control module goes bad (an aluminum resistance-welded wire lifts off its bond pad, Bill kindly ran a full autopsy here). Debugging is best done with a DMM; an OBDII scanner can ONLY find "communication errors", i.e., it cannot tell a bad speed or pressure sensor from a bad ABS control module and will often report the wrong problem because it isn't inserted BETWEEN the ABS control module and the various sensors (see extensive reports by 540iman on this). The ABS control module costs ~$150 to $300 to rebuild, ~$500 to replace; if you put anything back on other than your original ABS control module, the VIN will need to be recoded (15 minutes with a GT-1 or Autologic or similar; impossible otherwise). You'll need to clear your OBDII DTC codes after you fix everything if you plan on passing smog tests that week (ask me how I know). If you need to replace a speed sensor, don't go aftermarket; get as close to OE as possible.
Before you send your ABS control module out for rebuilding, please consider opening it up first, post pictures to Bill's ABS autopsy thread (the rebuilders say they work on previously opened ABS control modules all the time). If you fix the broken wire, post that to the thread as a success story!
http://www.bimmerfest.com/forums/showthread.php?t=696108
Not sure if it will work, but feel better now on paying $100 to dealer to use their DMM and that maybe my GS911 only said "can not communicate with ABS module"
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