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Discussion Starter · #1 ·
Hi all,
I was out in the M5 last night,giving her a bit of an airing after a week of very little use,she performed beautifully as normal but whilst on th way back towards home i came out of a roundabout, up behind th traffic travelling at about 50/60 mph. There was traffic comeing the other way so i held on a coupleof seconds for them to clear and then nailed it from about 60/65 mph in third gear(4250rpmish).
Just as i went to change up again my OBC 'gonged' and the display flashed up "MAX 110mph" then disapeared again. I have never seen this before and Ive just read in the handbook that its down to overloading or SLS problems. I have just checked the fluid level and had a quick look arouynd under the car and couldnt see anything amiss,also i could not get it to do it again.
Should i be worried??? Any opinions???? It was only myself and my Mrs in the car.:confused2
 

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Geach said:
Hi all,
I was out in the M5 last night,giving her a bit of an airing after a week of very little use,she performed beautifully as normal but whilst on th way back towards home i came out of a roundabout, up behind th traffic travelling at about 50/60 mph. There was traffic comeing the other way so i held on a coupleof seconds for them to clear and then nailed it from about 60/65 mph in third gear(4250rpmish).
Just as i went to change up again my OBC 'gonged' and the display flashed up "MAX 110mph" then disapeared again. I have never seen this before and Ive just read in the handbook that its down to overloading or SLS problems. I have just checked the fluid level and had a quick look arouynd under the car and couldnt see anything amiss,also i could not get it to do it again.
Should i be worried??? Any opinions???? It was only myself and my Mrs in the car.:confused2
It indeed says that when the sls fails. However, in that case she would have "gonged" you about the sls already.
I have a similar problem. Sometimes when driving it gives me the sls-gong. Exceeding 170km/h will then give you this warning.
 

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Doesn't it also bong and display a message when you set up a speed limit warning on the OBC?
 

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Mmm-Five said:
Doesn't it also bong and display a message when you set up a speed limit warning on the OBC?
It does indeed, can be quite funny sometimes...
 

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plisken said:
It does indeed, can be quite funny sometimes...
You mean like when your doing an indicated 150mph on the M6 Toll at 2am watching for rozzers and then it bongs as you hit a limit you programmed in and forgot about months ago.

So funny I was touching cloth :nono:
 

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My experience of this was down to the left rear ABS pulse sensor failing which affects the whole EDC system. I have again got this problem with the full 'EDC not Active' sign coming up. This was following my speedo 'dropping' out (as before). My guess is that one of the sensors has failed again, (ABS, EDC, Speed) although my speedo is reading again.

I have gone to the old 'fix' of disconnecting the battery for an hour and seeing what the result is? Disconnection in progress as we speak.

But as I say, I'm pretty sure its one of the sensors failing again. Will advise results later.

Thanks

Brian






plisken said:
It does indeed, can be quite funny sometimes...
 

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yewcorner said:
My experience of this was down to the left rear ABS pulse sensor failing which affects the whole EDC system. I have again got this problem with the full 'EDC not Active' sign coming up. This was following my speedo 'dropping' out (as before). My guess is that one of the sensors has failed again, (ABS, EDC, Speed) although my speedo is reading again.

I have gone to the old 'fix' of disconnecting the battery for an hour and seeing what the result is? Disconnection in progress as we speak.

But as I say, I'm pretty sure its one of the sensors failing again. Will advise results later.

Thanks

Brian
----------------------

Brian

what happened after you reconnected?
 

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Dan,

She did it to me on a trip up North. I got her checked out by a specialist in Stockport who did a diagnostic check. He said he couldn't find anything wrong and to ignore it unless something related happens (SLS etc.)
 

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Mmm-Five said:
Doesn't it also bong and display a message when you set up a speed limit warning on the OBC?
When you set up your own limit it puts up the warning ' LIMIT XXX MPH '
i have mine set to 90 mph when travelling on the motorways just to remind me to think again ,how valuable my licence is to me ,before 'having a play' :)

doesn't always stop me though :M5launch:
 

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The 110mph limit is suggested by the manual if there's a ride height problem to protect the tyres. Ride height or SLS failure is triggered by the height sensor switch linked to the right rear trailing arm. I had this problem for some time before I traced it to a broken wire. It could be that a dose of prolonged acceleration caused the ride height to drop sufficiently (and long enough) for the warning to be triggered.

The sensor is not adjustable (but the ride height is). If the problem persists disconnect the height sensor arm (from the suspension arm) and lock it in the calibration position (there's provision for this) and see if it goes away.

I haven't got round to re-attaching mine!!
 

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Reconnected this morning but still have the 'EDC Not Active' sign coming up. I'll book it in to BMW for a check up, as I say, my guess is that it will be one of the ABS pulse sensors or the differential to speedo sensor. I'll report back as soon as I have any news.

Good thing is that it had defaulted to the 'medium' setting so is pretty good in terms of handling.





Jahangeer said:
----------------------

Brian

what happened after you reconnected?
 

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yewcorner said:
Reconnected this morning but still have the 'EDC Not Active' sign coming up. I'll book it in to BMW for a check up, as I say, my guess is that it will be one of the ABS pulse sensors or the differential to speedo sensor. I'll report back as soon as I have any news.

Good thing is that it had defaulted to the 'medium' setting so is pretty good in terms of handling.
I had EDC problems myself last year. Eventually turned out to be one faulty acceleration sensor. You can have your mechanic check them: connect the car to the diagnostics machine and browse to EDC settings. The device allows you to read the values of all sensors in real-time. Now select the acceleration sensors (there are three, one for each rotational axis) and rock the car; see if the readings match the car's movements.
The sensor that sits in the boot (under the carpet, close to the backseat) was faulty, even though it has no mechanical parts and lives comfortably inside the car. Got it replaced and the problem was gone.
 

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Discussion Starter · #13 ·
Johnnym5 said:
Dan,

She did it to me on a trip up North. I got her checked out by a specialist in Stockport who did a diagnostic check. He said he couldn't find anything wrong and to ignore it unless something related happens (SLS etc.)
Thanks John, I have had no problems since and all seems well. I wasx accelerating hard at the time so maybe this did trigger it? Will keep an eye out, hopefully gonna ditch the SLS soon for a H+R/Koni set up.
 

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I've had this warning before, but only on my 3.6. It used to occur on only one stretch of the A27 where the road dropped into a long rising left hander. I'd regularly drive that at 120+ and used to get the warning. I think the road camber is a little odd there. There was definitely no fault with the car.

I've never had the warning on either 3.8s I've owned.
 

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Smokestack said:
I've had this warning before, but only on my 3.6. It used to occur on only one stretch of the A27 where the road dropped into a long rising left hander. I'd regularly drive that at 120+ and used to get the warning. I think the road camber is a little odd there. There was definitely no fault with the car.

I've never had the warning on either 3.8s I've owned.
The speed limit bong has affected my car ONLY when the sls ride height was deemed as to low by the ride height sensor.

The KDS alignment check can confirm a ride height fault & usually it can be resolved by raising the ride height via the adjusment rod attached to the accumilator to rear sway bar.

Farrell
 

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Had the EDC checked/reset at BMW yesterday (FOC). Only fault showing was the speedo signal dropped out. Could be the diff to speedo unit/wiring starting to deteriorate, but no visible signs todate.

Amazing how different the car is to drive with and without the EDC. Can only imagine this is how the 3.6 handles? Surely the 3.6 suspension works better than the jammed EDC suspension?

Not sure if I could have a non EDC car; while it was off, the LSD was constantly and noticeably in action and loads of tyre screeching on corners (even at low speed). With only about 60% of the normal EDC handling characteristics.

All 3.6 er's please take this as feedback from an inactive EDC systems as opposed to a dig at a standard suspension setup.

Thanks







yewcorner said:
Reconnected this morning but still have the 'EDC Not Active' sign coming up. I'll book it in to BMW for a check up, as I say, my guess is that it will be one of the ABS pulse sensors or the differential to speedo sensor. I'll report back as soon as I have any news.

Good thing is that it had defaulted to the 'medium' setting so is pretty good in terms of handling.
 

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EDC PROBLEM....

By the sounds of it you have the beginnings of a wiring problem which
affects EDC M5's.
It happened to mine a few years ago after which I repaired the wires myself.

My symptoms were pretty tame, I lost the speedo reading once, and then the dampers defaulted to firm all the time.

Turns out there is a weak point in the wiring loom location as it leaves the car (behind the rear seat near the battery) and exits upwards (outside, under the floor) over the rear subframe.
The wiring harness contains EVERYTHING for the rear end...ABS, SPEEDO FEED, SLS HEIGHT SENSOR, FUEL PUMP and of course the EDC control...

Basically the loom flexes and rubs against the rear subframe causing wires to short out.
Depending on how severe the problem becomes you may just loose your speedo or edc control, but the potential for a nasty little loom cook is there..
:(

I posted about this a while back, so please check it out at the earliest chance...!

SLS PROBLEM is simply caused by tired pressure spheres which cant handle the load of full throttle / heavy load at the same time (they are 10+years old!)

This triggers the OBC alarm warning which of course goes away again...

Hope this info is useful...

Best regards,


Alan.


ps, this is one wiring pic I have posted...
http://www.bmwm5.com/photo/data/503/569photoA.jpg

sorry, cant get the link to work auto !
 
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