ABS Sensor Problems - MINI Cooper Forum
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post #1 of 24 (permalink) Old Dec 1st, 2017, 09:53 AM Thread Starter
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ABS Sensor Problems

Hi all,

Firstly, I hope this is the correct section for this issue!

I have a 2004 (54) MINI Cooper S R53.

When I first started driving the car, it had an intermittent warning light trifecta (ABS, ASC, TPMS), the car was due a set of new brakes, so I fitted new discs and pads all round, new front hubs and front ABS sensors - this initially solved the problem, however on the colder or wet mornings the ASC light would flash until I had driven for about a mile, then everything would be fine.

This gradually got worse to the point that on cold mornings the trifecta would return, accompanied by the handbrake light, and sometimes the check engine light. After driving for a mile, turning the car off and back on again it would be fine for the rest of the day.

I decided to buy an ABS code reader which displayed the following codes:

5D90
5DA1
5D91

And the check engine code is P0500 which shows as vehicle speed sensor (makes sense)


The ABS codes all refer to the front ABS sensors. As I had cheaped-out and bought them from eBay for £10 each, I figured this was probably the cause. So I ordered a pair of TRW front ABS sensors which I understand to be of decent quality and certainly feel much more chunky.

I have just fitted them and the problem is even worse now, the lights all come on (ABS, ASC, TPMS, handbrake, check engine) and will not go away. Now the codes displayed are:

5D90
5DA1
5D91
5DA3
5D93

These again all relate to the front ABS sensors. Surely they canít both be duff?

I selected Ďview data streamí which showed that the front ABS sensors are giving no reading at all, whereas the rears are working fine.


Does anyone have any ideas here? As I canít think what the problem could be. Could the ABS module be to blame?

Any ideas appreciated.

James

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post #2 of 24 (permalink) Old Dec 1st, 2017, 11:54 AM
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There is a magnetic ring on the wheel bearing that the Speed sensor reads off.

Its possible it has fatigued and the sensor can't get the reading.

If i remember correctly you can remove the wheel bearing and inspect the Ring for damage or corrosion....

rgds Henry...

Here's a link

https://www.google.co.uk/url?sa=t&rc...QOPGegOstxEWZe


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post #3 of 24 (permalink) Old Dec 1st, 2017, 01:38 PM
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Quote:
Originally Posted by minione2002 View Post
There is a magnetic ring on the wheel bearing that the Speed sensor reads off.

Its possible it has fatigued and the sensor can't get the reading.

If i remember correctly you can remove the wheel bearing and inspect the Ring for damage or corrosion....
I think he's changed those, if that's what he means by changing the front hubs.

I love American video guides where there's no rust whatsoever
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post #4 of 24 (permalink) Old Dec 1st, 2017, 01:43 PM Thread Starter
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Thanks both.

Yes I have replaced both front hubs/bearings already (they come as one unit if I’m not mistaken).

Could they be the cause of the problem? I’m really stumped for ideas.

As I replaced everything in one go, it’s harder to pin point one change that would have cause it.

I did use copper grease in the reassembly which I’ve since been told is definitely not a good idea, however I can’t remember where exactly I applied it, and surely it would have been giving me problems all the time from the beginning if that was the problem.



Agree with the American videos! I used loads of MODMINI’s videos as I got the mini as a non runner, his videos helped me strip the engine down and change the head gasket with very little previous experience. If only all the bolts came off as easily as his do!!!
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post #5 of 24 (permalink) Old Dec 1st, 2017, 03:26 PM
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Quote:
Originally Posted by jbenekeorr View Post
Thanks both.

Yes I have replaced both front hubs/bearings already (they come as one unit if I’m not mistaken).

Could they be the cause of the problem? I’m really stumped for ideas.

As I replaced everything in one go, it’s harder to pin point one change that would have cause it.

I did use copper grease in the reassembly which I’ve since been told is definitely not a good idea, however I can’t remember where exactly I applied it, and surely it would have been giving me problems all the time from the beginning if that was the problem.



Agree with the American videos! I used loads of MODMINI’s videos as I got the mini as a non runner, his videos helped me strip the engine down and change the head gasket with very little previous experience. If only all the bolts came off as easily as his do!!!


Cheap wheel bearings have a tendancy to be shyte oot the box.

@JohnnyC had bad experience with cheap wheel bearings, Continental bearings or somefink??

Also check for breaks in ABS wire

Copper grease shouldn't be used on suspension Components IMO

did you get any CG on the Abs sensors themselves??
if you did it, the copper grease might be causing your issue!!

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post #6 of 24 (permalink) Old Dec 1st, 2017, 03:26 PM
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Originally Posted by jbenekeorr View Post
Thanks both.

Yes I have replaced both front hubs/bearings already (they come as one unit if Iím not mistaken).

Could they be the cause of the problem? Iím really stumped for ideas.

As I replaced everything in one go, itís harder to pin point one change that would have cause it.

I did use copper grease in the reassembly which Iíve since been told is definitely not a good idea, however I canít remember where exactly I applied it, and surely it would have been giving me problems all the time from the beginning if that was the problem.



Agree with the American videos! I used loads of MODMINIís videos as I got the mini as a non runner, his videos helped me strip the engine down and change the head gasket with very little previous experience. If only all the bolts came off as easily as his do!!!
copper grease hold copper cooper is a very good conductor and also not magnetic so the abs works on magnetic field so that why never use is anywhere near the abs reluctor rings and sensors,, light copper wire brush even use a bit of rust cure on them as this stop the rust, also the plug connectors corrode internally a lot of the time always wd40 them and switch cleaner spray,,, if you have a cooper grease issue maybe a pressure washer all in around that area will remove it
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post #7 of 24 (permalink) Old Dec 1st, 2017, 03:29 PM
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Originally Posted by JohnnyC View Post
I think he's changed those, if that's what he means by changing the front hubs.

I love American video guides where there's no rust whatsoever

Living in Britain is a nightmare where rust in concerned

I don't even bother looking under my mini tbf, i'm cringing at the thought of what i'll find !!
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post #8 of 24 (permalink) Old Dec 1st, 2017, 03:45 PM
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Originally Posted by minione2002 View Post
Cheap wheel bearings have a tendancy to be shyte oot the box.

@JohnnyC had bad experience with cheap wheel bearings, Continental bearings or somefink??
Well remembered

Yes, this is what I bought for £26 delivered...


And this is the magnetic ring after driving it a few feet...


I'm sure I didn't bang it on the drive shaft, or maybe I did, it's easily done.
No problem at all with the replacement that I got (which was oem, only because they had one in stock that I could collect and I needed my car back on the road ASAP, but cost a whopping £170).

The only place copper grease should be used here is a small amount on the threads of the four bolts that secure it to the actual hub.
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post #9 of 24 (permalink) Old Dec 1st, 2017, 04:10 PM
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Cheers Johnny they look shyte quality and its only a picture!!

@jbenekeorr It is possible you knocked up the magnetic ring its easily done as JohnnyC said, it might be worth pulling them off and having a look..

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post #10 of 24 (permalink) Old Dec 1st, 2017, 04:16 PM Thread Starter
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Thanks all.

The ones I bought are made by Elite Auto apparently!

https://rover.ebay.com/rover/0/0/0?m...2F302337866732

I deliberately didnít buy the cheapest ones. However they were hardly OEM price.

What do we think?

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post #11 of 24 (permalink) Old Dec 1st, 2017, 05:35 PM
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Quote:
Originally Posted by jbenekeorr View Post
Thanks all.

The ones I bought are made by Elite Auto apparently!

https://rover.ebay.com/rover/0/0/0?m...2F302337866732

I deliberately didnít buy the cheapest ones. However they were hardly OEM price.

What do we think?

They look ok.

But you might of hit the reluctor ring with the driveshaft upon installation, easily done ya know.

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post #12 of 24 (permalink) Old Dec 1st, 2017, 05:38 PM Thread Starter
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Yes I think you might be right there. Iím taking it to a chap I use for the jobs I canít do (or the jobs I tried to do and screwed up!!) tomorrow morning for him to have a look.

What are the chances of me screwing up both of the reluctor rings though? As the codes are for both.

Thanks for all the help so far everyone!
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post #13 of 24 (permalink) Old Dec 2nd, 2017, 09:50 AM
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Living in Britain is a nightmare where rust in concerned

I don't even bother looking under my mini tbf, i'm cringing at the thought of what i'll find !!
on a couple of cars i have had for 20 years from the start i once a year spray old engine oil on the under side of them got no rust and on factory arms,, i use a hold under seal gun and compressor works a treat
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post #14 of 24 (permalink) Old Dec 4th, 2017, 02:37 PM Thread Starter
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Hi all,

I've still not got any further i'm afraid. Took it down to the chap on Saturday and with his tool plugged in, we couldn't really diagnose anything. Both front sensors are spiking on and off when the car is stationary. Sometimes just one, sometimes both.


I recorded it on my own tool this morning. I haven't made enough posts to be able to link you to the video yet - but if you search "Mini ABS Sensor Readings" on YouTube, it should be a 12 second video.


I'm still yet to take the hubs off to inspect the ABS rings, but it does seem like a bit of a coincidence that both would be damaged in exactly the same way.

I'm going to check for damaged wiring going to the ABS module too, although wiggling the wires directly going into the module didn't seem to make any difference in the readings.

I don't know but my gut feeling says it's the ABS module for some reason...

Also, is there any significance that the handbrake light illuminates with the usual trifecta? As it didn't do that in the early days, but always does it now.
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post #15 of 24 (permalink) Old Dec 5th, 2017, 05:03 PM
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These things can happen

I would inspect the reluctor rings before replacing expensive parts!

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