General Category > ABS related issues

ABS Wheel Speed Sensor Phase Shift problem

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botus:
its normal on BMW bikes for the senor wires to snap - usually its the rear one - specially routed with cable ties to deliberately stress one section till they break - on the earlier bikes it also flags a snapped rear sensor as the front

that fake diagnostic confusion comes from limited / budget diagnostic capability - ABS will feed different signals based on grip each wheel sees - and thus the bike doesn't care if the rear is feeding interesting info (it just thinks the grip levels are bad on the back wheel when braking - but on early ASC traction control, all they did was try to judge if both wheels speeds are the same under acceleration by using the ABS sensors - so a part broken intermittent signal from a failing rear ABS sensor throws the ASC in to a meltdown of no grip - so it kill the engine

ALL BMW riders need to know this - so they can switch out traction control and ride home rather than get the vehicle recovered over nothing !

the best bit as the system just knows there's a massive difference in wheel speed, but not which was slipping, so, Quick throw an error code - as I don't know which, just pull the first code in the list - which is the front senor failure

what else happens when it has the inertia sensor picking up info on later bikes I don't know (optional from 2015)

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