’97 E39 touring 523se abs and asc saga |
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denisbilyard
Newbie Joined: 02-May-2009 Status: Offline Points: 3 |
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Posted: 02-May-2009 at 17:15 |
Hey folks. I have just registered with the forum but I have looked at past posts regarding my abs light problem and you have been a great help so far. The problem I hope you can help me with is (here goes!!) The abs and asc lights came on intermittantly with the usual turn ignition off and then restart car ad lights would go off 10 yards down the road. This started happening more frequently until it was happening all the time. The front passenger wheel bearing then started growling at me so got that changed but since then the abs/asc lights stayed on all the time apart from a couple of times the lights would go off but I would hear the abs pump or electric motor whirring and also when dabbing the brake pedal I would be getting the abs vibration through it as well. Very soon after the 2 lights would come on and all the whirring and brake pedal vibrations stopped. obviously the abs system was then disabled. I changed the wheel sensor on the same corner as I thought the dodgy bearing had knackered the sensor. Since changing the sensor the lights have gone out (YEHA) but I am still getting the whirring from the abs unit and the pedal is still having arguments with me. There, I think thats all the detail I really hope someone can help
Oops nearly forgot, below 20-25 mph all whe pupming stops.
I need to update this now. Just travelled about 4 miles (2nd journey since changing sensor) and the abs would whirr now and again but as I was getting home it kept whirring and then lights came on I also noticed that in drive rather than semi auto it wouldnt change out of gear, until i put it back into steptronic PLease Please help me Many Thanks Denis Edited by denisbilyard |
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Andrew Rolland
Moderator Group Go away rain Joined: 19-August-2004 Location: Scotland Status: Offline Points: 6579 |
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You still have a fault with a front wheel sensor. The automatic E39s use the front wheel sensors as input speeds for the transmission to change gear. When I had this fault on my E39 both times (once for each front sensor) the tranny refused to change between 3rd and 4th and I had to manually change it. You need to get the fault diagnosed by a garage. They will be able to tell you which sensor or part of the ABS system is faulty. Did you get a diagnostic check done on the car before you changed the wheel sensor? You might have changed the wrong sensor. Try putting the old one on the other front wheel side. A knackered wheel bearing would not upset the ABS system unless it was a fault with the rotating toothed disc on the bearing assembly which is unlikely. It is also a myth that a broken ABS wheel sensor has a different electrical resistance from a good 'un unless of course a wire has broken. Broken sensor wiring is not unheard of on an E39. Let us know how you get on Andrew |
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Current '13 62 F10 535i MSport Auto Previous '04 04 E60 545i SE Auto '03 53 E60 545i SE Auto (Stolen) '98 S E39 523i SE Auto |
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denisbilyard
Newbie Joined: 02-May-2009 Status: Offline Points: 3 |
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Cheers Andrew I have the car booked in for a diagnostics on wednesday, so will get the low down then. I did try taking a chance by changing the sensor as I thought it was a bit of a coincidence that the abs knackered up the same time as the bearing. What I have found though is that the tranny only started playing up when I changd the sensor. Could I have got a duff sensor? |
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Hasso
Senior Member I Joined: 15-August-2007 Location: Kumla Sweden Status: Offline Points: 128 |
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Its a typical reading problem from one of the front sensors. Faulty or dirty sensor (small metalparts on the sensor give magneticfield disturb) check also the ground
it could also be the triggerpoint on the wheelbearing ist damage is also a possible. There is different sensors before and after 09/98 . Note: only a small differance on the tyretread on front axel give problems with gearshifting on a autobox also without any ABS/ASC varning light. The limit must be under 5%. Have 2 customer cars with your problem and and both have problem with a frontsensor one of the have grease and metalmixparts on the other have a faulty sensor. I drive the car with live date and the sensor only give right signallevel sporadic. http://www.autopower.se/galleriet/bloggbilder/00015152_s640. jpg http://www.autopower.se/galleriet/bloggbilder/00015153_s640. jpg
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BR Hasso
BMW 540T 2001 6 speed. BMW 316G (biogas) -1998 http://www.autopower.se/galleriet/bilder.asp?bil=40895 http://www.autopower.se/galleriet/bmw.asp?bil=45700 http://www.autopower.se/galleriet/bmw.asp?bil=40865 http://www.autopower.se/galleriet/bmw.asp?bil=45749 |
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denisbilyard
Newbie Joined: 02-May-2009 Status: Offline Points: 3 |
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Hi Thats a very interesting point about the tyre tread. I changed the front tyre because the faulty bearing wore the outside of the tyre so its like an egg! So there is a difference with treads. will put original wheel back on and see if that cures it. Thanks for the help. Will let you know how I get on on wednesday |
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Andrew Rolland
Moderator Group Go away rain Joined: 19-August-2004 Location: Scotland Status: Offline Points: 6579 |
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Yes, if you have worn front tyres compared to your rears and one front tyre more worn than t'other then this too will upset the ABS system as wheels will be rotating at different speeds and it doesn't like it. This confuses the autobox also and it has been known to force it into limp mode. Andrew |
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Be exclusive and drive a Petrol 5 Series!
Current '13 62 F10 535i MSport Auto Previous '04 04 E60 545i SE Auto '03 53 E60 545i SE Auto (Stolen) '98 S E39 523i SE Auto |
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Hasso
Senior Member I Joined: 15-August-2007 Location: Kumla Sweden Status: Offline Points: 128 |
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Its the ASC system who have trouble with differnet tyretread in front and also get gearshifting problem sometimes also it gets to limpmode, but more normal is that is dont go up to 4 and 5 gear and no varninglights at all. The limit 5% is smaller in curves becuse the system must compensate fore the differance rotationspeed. To much differnet front axel and rear axel could also give problem with ASC regulation. also to much differnace in tyrepressuare. En E60 and up, the RDC system take signal from wheelsensors instead of sensors in each wheel. |
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BR Hasso
BMW 540T 2001 6 speed. BMW 316G (biogas) -1998 http://www.autopower.se/galleriet/bilder.asp?bil=40895 http://www.autopower.se/galleriet/bmw.asp?bil=45700 http://www.autopower.se/galleriet/bmw.asp?bil=40865 http://www.autopower.se/galleriet/bmw.asp?bil=45749 |
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