jluis
Member
- Messages
- 1,703
I checked my ABS sensors and all seemed fine and no codes present on the SD2.
How did you manage to check the sensors via SD2 if the ABS ECU is not communicating?
I checked my ABS sensors and all seemed fine and no codes present on the SD2.
Physically checked them inspection. You can also measure resistance apparently but I don't buy that a faulty sensir can blow the ECU.
I think it's a bit more complicated than that.
You should rotate the wheel and measure with a frequency meter or oscilloscope the hall voltage output to make sure it's pulsing when the wheel spins.
But anyway, a faulty hall sensor should not damage a well designed controller.
I think it's a bit more complicated than that.
You should rotate the wheel and measure with a frequency meter or oscilloscope the hall voltage output to make sure it's pulsing when the wheel spins.
But anyway, a faulty hall sensor should not damage a well designed controller.
Be aware that these ABS units have custom microchip dies on them and not a single one of them is a replaceable item.
This is why the cover of the ABS controller is sealed and it must be destroyed to open the unit.
It was designed as a cheap non serviceable item.
The problem is that auto makers put a huge markup on something that is quite cheap to build.
All that the "repair" companies are able to do is rewire the board to the connectors whenever the fault is caused by a broken wire (Most common failure).
You can see that in this picture of a board:
http://www.bimmerfest.com/forums/attachment.php?attachmentid=228226&stc=1&d=1272646721
Those big squares in the middle are microchip dies that have not been packaged and are covered in silicone to protect them.
The quality of this repair varies from shop to shop.
Some shops use the correct soldering method and remove the silicone goo before doing so.
In the end they apply a new coating and a new cover.
Some other "shops" simply make a big mess with a standard soldering iron and render the board useless or prone to failure a few km's later when the unit is subject to vibration.
I would not trust my life to an ABS unit repaired this way as a malfunctioning solenoid would mean a "No brakes" condition.
Something you should avoid in any car, especially a 400HP beast while doing spirited driving.
I know that the units are engineered to fail in a way to prevent this situation but I would still avoid it.
Either way, if it's not broken wires, it's not fixable.
I would like details as soon as I get round to getting the module off the car.