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Abs problem
#11
So my Berlingo Multispace 1.6Hdi XTR 2008 has succumbed to the pulsating pedal syndrome and I've now got an ABS light up. Borrowed a friend's diagnostic machine and it pinpointed the fault as the front o/s sensor. Replaced the sensor and unfortunately it is still the same. Going to have to do some wiring checks back to the ABS unit. Does anyone have a wiring diagram they could share for the ABS sensors, specifically what pins on the ABS sensor plug go to each wheel?

Thanks for any help.
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#12
(30-12-2018, 12:18 AM)Multispacer Wrote:  So my Berlingo Multispace 1.6Hdi XTR 2008 has succumbed to the pulsating pedal syndrome and I've now got an ABS light up. Borrowed a friend's diagnostic machine and it pinpointed the fault as the front o/s sensor. Replaced the sensor and unfortunately it is still the same. Going to have to do some wiring checks back to the ABS unit. Does anyone have a wiring diagram they could share for the ABS sensors, specifically what pins on the ABS sensor plug go to each wheel?

Thanks for any help.

I've attached a diagram I got from Sedre a while ago for another thread on the subject. Unfortunately it's a generic M59 ABS diagram, not a B9 diagram. I'm not sure how much difference there will be, so if it does't seem to make sense, PM me your VIN & RPO code, I'll try to find the correct diagram.
Maybe catcar will be of some use:
https://www.catcar.info/citroen/?lang=en&l=


Attached Files
.pdf   ABS.pdf (Size: 1.42 MB / Downloads: 7)
[-] The following 3 users say Thank You to cancunia for this post:
  • Art b, Multispacer, Tomcat3
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#13
(30-12-2018, 12:18 AM)Multispacer Wrote:  So my Berlingo Multispace 1.6Hdi XTR 2008 has succumbed to the pulsating pedal syndrome and I've now got an ABS light up. Borrowed a friend's diagnostic machine and it pinpointed the fault as the front o/s sensor. Replaced the sensor and unfortunately it is still the same. Going to have to do some wiring checks back to the ABS unit. Does anyone have a wiring diagram they could share for the ABS sensors, specifically what pins on the ABS sensor plug go to each wheel?

Thanks for any help.

When you disassemble on the ABS side and if you have a multimeter, doing continuity tests will be quite easy. The sensor wires are twisted pairs, and the colors are kept between the ABS pump side and the sensor connectors. Did you check, before going into the the ABS plug, if this can be a magnet problem or a sensor distance problem? there are several posts here regarding the sensor distance increasing due to rusting, that can be easily eliminated by some thorough cleaning. With a new sensor, that you already have, all these cases are easy to diagnostic if you have a multimeter...
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#14
Well an update on this. had all the wiring apart today and did continuity checks between the sensor disconnect in the front o/s wheel arch and the ABS servo plug located on the front nearside wheel arch. Both were fine, so now where do I go from here?

I've seen member mention about corrosion of the sensor ring and mine does look a bit corroded. I've tried cleaning it but you cannot really get to it that easily. Do I need to get the hub off to clean it properly? If the sensor ring is damaged can it be replaced or is it integral to the hub?  

Could I just replace the whole hub with a second hand unit and if I did, can it be from a Citroen C4 Picasso or is the Berlingo on different? [Asking as there seem to be many more Picasso hubs available than Berlingo ones

Finally and as if this job wasn't annoying me enough now, it seems I now have a small split in the front o/s CV joint gaiter [and before anyone says it, no it wasn't grease causing the ABS defect, I actually managed to damage it when I dropped a tool today and the law of s** kicked in and damaged the gaiter Angry ] How easy are these to change? The Haynes book states there are three different types, any way of finding out which mine has? What size is the hub nut? Thanks for any help
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#15
I have recently had a 13 plate C4 Picasso with this issue. We had to spend ages cleaning corrosion off the hub from behind the actual sensor.
It easier to do if you separate the bottom balljoint and pull the hub away from the driveshaft, this gives far better access for cleaning/de scaling.
You will be surprised how much corrosion builds up behind the sensor.
A sharp tap with a small hammer & chisel has the rust dropping off in layers, I have a small air dremel type tool to do it nicely.
To replace the abs ring you need to fit a new wheel bearing, so take care not to catch it whilst cleaning , it is very soft & easily damaged.
We had to clean up both sides on this particular C4 and it has only done about 40k miles, think it must have been parked somewhere very wet for a while.
All works perfectly now, at least for a year or two till it corrodes some more.
[-] The following 1 user says Thank You to Lighty for this post:
  • Multispacer
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#16
Gaiter split ??

If you can gain easy access you could hold open the two split sides of the gaiter give them a good clean and then solvent wipe the two faces - use aerosol brake cleaner or some such stuff and then apply a thin layer of " superglue " to join it back together. If you have superglue activator then all the better.

Super-gluing a gaiter is a bodge that works well and has saved me several times over the years.
I've even fitted new gaiters this way and the repair has lasted many tens of thousands of miles, saves a lot of work and can be done quickly.
[-] The following 1 user says Thank You to geoff for this post:
  • Multispacer
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#17
Thanks Lighty and Geoff for the replies, I'm going to have another go on my next shift days off [as it is my only vehicle] I've done a temporary repair on the gaiter using "self fusing rubber tape" which is holding well and I haven't lost any more grease, must admit I never would have thought superglue would hold a gaiter but I might just end up changing it as I will probably take out the driveshaft to be able to clean up the area around the ABS sensor [which I'm hoping is going to fix the issue!] I'll update everyone on the continuing saga  Rolleyes
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