ABS fault?

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ABS fault?

Postby zgeekster » Thu 20 Apr, 2017 19:56

Hi

I'm a newbie here, but have had my Z3 for a year now. I believe the previous owner had a blog on here calling it 'Cinders'.
Its been great, no real faults, until the ABS and traction control light came on, oddly just after I had jacked up the right rear to check the exhaust. So I had been convinced that I had moved the harness for the right rear ABS sensor. A battery disconnect cleared the fault for a few minutes, but now its always on.

I bought a C110 reader.

Initial code for P0500 speed signal could be erased , no problem.

It also had 14 Front Left and 41 Rear Right. But oddly 78 Battery Voltage. But the battery is 12.4 v. (Actually, come to think of it the warnings came on before i put a new battery in)

New sensors were fitted by the previous owner.

Faults cannot be erased at all.

I took the ABS ccontrol module off, just to check for corrosion. Couldn't see anything obvious. All pins look good. Put it all back together.

Now I have codes 14 and 41. But 78 has gone, replaced by 71 ABS PUMP.

The codes cannot be deleted at all. i.e it does not require driving with a lack of signal from the wheel sensors to trigger.

So.....what do you good people think? Replace the ABS control module, as a first step? Its actually cheaper than buying a sensor (for a known ok second hand one)

I really want to look inside for dry joints!

Many thanks

Geekster
zgeekster
 
Joined: Wed 19 Apr, 2017 07:25
Posts: 6

  Z3 roadster 1.9i

Re: ABS fault?

Postby John Wilson » Thu 20 Apr, 2017 21:03

Before you do all that, have you tried cleaning all the wheel sensors. It should be easy to do if they have been replaced. Just one bolt each one with an allen key. I used to have regular problems with my ABS light years ago when I first got the Z3. Now I clean the sensors once a year and never have a problem now. After you do them, the light doesnt go off straight away. It takes a couple of journeys.
John Wilson
 
Joined: Fri 12 Jun, 2009 12:11
Posts: 229

  Z3 roadster 2.0
Location: Diss

Re: ABS fault?

Postby zgeekster » Thu 20 Apr, 2017 21:26

Hi John

Thanks for your reply; much appreciated.

OK, I'll have a go at cleaning off the sensors - I'm just waiting for the locking wheel nut key to arrive so I can get the wheels off ( my small boy child was 'helping' a while back and put the key in the wheel bolt without telling me - its somewhere in a north london gutter!)

I found a module for £25, exactly the right part number, so I have ordered it any way, just incase.

I will feedback with results for reference.
zgeekster
 
Joined: Wed 19 Apr, 2017 07:25
Posts: 6

  Z3 roadster 1.9i

Re: ABS fault?

Postby zgeekster » Sun 23 Apr, 2017 20:51

Update....

I cleaned the sensors; right rear was fine. However, the left front was not so pretty, basically it had its end ripped off by a bit of the heat shield!
I managed to get a new sensor and fit it with no issue.

ABS and traction light still on. Fault codes still present even after trying to delete, a drive of 4 miles and a battery disconnect over night.

New ABS unit should be here tomorrow. I'll give it a go.

If its still no good is there anyone near North London, Barnet with better diagnostics?

Also, I'm going to need two new front quarters, strut, knucles, calipers, lower arms. Its all a bit of a mess under there! Any decent breakers out there?
zgeekster
 
Joined: Wed 19 Apr, 2017 07:25
Posts: 6

  Z3 roadster 1.9i

Re: ABS fault?

Postby zgeekster » Mon 24 Apr, 2017 19:57

Argh....

New controller arrived, put it on...

Pump fault has gone, but still got the right rear and left front codes. Plus, as an extra little bonus; 76 Electrical Interference to speed signals.
This was all when stationary. 3 mile drive and still the same.

I suspect a harness issue...do the Left Front and Right Rear share and common feeds?

Are there circuit diagrams and layouts available anywhere?

Thanks in advance!!
zgeekster
 
Joined: Wed 19 Apr, 2017 07:25
Posts: 6

  Z3 roadster 1.9i

Re: ABS fault?

Postby zgeekster » Mon 24 Apr, 2017 20:11

Woo hoo

I found the wiring diagram on the Knowledge base.

Z3 ownership seems to be a rollercoaster of emotions!
zgeekster
 
Joined: Wed 19 Apr, 2017 07:25
Posts: 6

  Z3 roadster 1.9i

Re: ABS fault?

Postby bertiejaffa » Mon 24 Apr, 2017 20:41

Stick with it - it can be a steep learning curve initially but theres plenty of info on here to get you through...

Welcome btw
Here come the girls.....
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My //M Refurb
My First Zed Journal
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  M roadster S50
Location: Manchester


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