ABS problem

[legepe]

Hi all
I have a Berlingo Multispace 1.6 diesel 2012
I have a problem with the ABS light being on
To note, it also makes the car run slightly erratically on low revs when driving, but put your foot on the accelerator and it has much more power
I have checked the obvious things like fuses and low brake fluid but all are ok
Today I replaced the OSF sensor as it was showing a reading that to me didnt seem ok, as it started on a higher reading then slowly settled on 176.3k ohms
I compared it to the NSF sensor which had a reading of 10.38m ohms
The new one that I bought had a reading of 0.817m ohms
Ive done a certain amount of reading and looking on you tube vids, but I am confused as to what reading I should be getting with these sensors
Can anyone tell me are any of these readings of any good, and what should I do, as the light is still on and the car is still erratic and excessively powerful
Any advice very much appreciated
Thanks
legepe
ps: I have lexia diagbox which would maybe help me, but cannot get it to work on my computer, and simply do not have the time to get it working at the moment




           

[shtu]

A siimilar thread, https://www.berlingoforum.com/thread-17994.html

Worth checking resistance ay the sensor itself, and at the ABS module plug. Could easily be a wiring loom fault.

Also - a fault that can crop up on these is corrosion behind the sensor pushing it away from the ABS ring. While you're in there anyway, take them off and give the hub area a damn good chiselling and wire brushing.

[Multispacer]

Hi all
I have a Berlingo Multispace 1.6 diesel 2012
I have a problem with the ABS light being on
To note, it also makes the car run slightly erratically on low revs when driving, but put your foot on the accelerator and it has much more power
I have checked the obvious things like fuses and low brake fluid but all are ok
Today I replaced the OSF sensor as it was showing a reading that to me didnt seem ok, as it started on a higher reading then slowly settled on 176.3k ohms
I compared it to the NSF sensor which had a reading of 10.38m ohms
The new one that I bought had a reading of 0.817m ohms
Ive done a certain amount of reading and looking on you tube vids, but I am confused as to what reading I should be getting with these sensors
Can anyone tell me are any of these readings of any good, and what should I do, as the light is still on and the car is still erratic and excessively powerful
Any advice very much appreciated
Thanks
legepe
ps: I have lexia diagbox which would maybe help me, but cannot get it to work on my computer, and simply do not have the time to get it working at the moment

Just re-read your post after initially thinking it was an ABS error, then saw your other faults. I think this sounds like the water damage to the engine bay fusebox scenario [which is comnmon on a lot of PSA group vehicles] read on...

I suddenly had a load of random [and I thought un-connected] things start to occur on my 2008 Berlingo XTR. When I say random, I really do mean random. First, rear wiper stopped operating then shortly after had random 'STOP' warnings and ABS warnings appear finally vehicle wipers randomly would start and headlamps switch on when the vehicle was parked up and everything off, with the keys not even in the ignition!

Without going into a very long story the culprit for many random [electrical] faults on the Berlingo and other PSA group vehicles is the engine bay fuse box [the one that sits adjacent to the battery] Turns out this is not only a fuse box but also has a load of electronics on the underside of the circuit board that communicates between various systems and the BSI. The thing is they are susceptible to water damage [if you look on the cover of the engine fuse box it shows a diagram indicating not to get the box wet] The problem being on the Berlingo [and many other PSA group vehicles] is that when the scuttle drains at the edges of the engine bay [underneath the windscreen wiper scuttle panel] get blocked with debris [leaves etc] the water has nowhere to go except into the engine bay and can quite often soak the fuse/electronics box causing all sorts of problems. In my case, it wasn't actually rain water but a rodent had got into the box and was using it as it's home/toilet and the liquid caused all the electronics to short out.

So that is a possible place to check. There is often visible evidence of liquid in the fuse box or corrosion on the blades of the fuses in the engine bay fuse box. Obviously if you are going to pull out the fuses to check for corrosion on the blades, make sure the vehicle has first entered 'sleep mode' before disconnecting the battery and then pull the fuses one at a time to check for any liquid damage/corrosion. Any you do find corroded clean up an apply electrical contact cleaner [do not apply any other kind of spray apart from contact cleaner] You might be lucky and that cures the problem.

If there is evidence of liquid damage you may have to replace the whole engine bay fusebox/circuit board as I had to as the board had been shorted out because of the reasons I gave earlier. This isn't as bad as it sounds, as it is fairly easy to replace [only took me about 20 minutes] and no coding re-programming of anything is required.

The one thing to make sure of if you do go down this route is to get the EXACT same part number of fusebox, as there are many different types that look the same but are not. Luckily the board is used in a number of different PSA group vehicles and I got a used one from a dealer on Ebay which I think cost me about £35 delivered but the different part numbers do vary quite widely in cost. 

An image of the box and where to find the part number [circled in red] are below

Final thing, if you do find water damage, make sure you remove the scuttle panel and check the engine bay scuttle drains are not blocked, or it could all happen again!

[legepe]

Hi guys and thanks very much for your advice!
How this problem all seemed to start:
There is a common problem with this type of vehicle that if you use the windscreen washer and the water/fluid is frozen it will blow the fuse - so this is when my ABS problems started - I stupidly pored boiling water from a kettle into the screen washers water bottle, and then the remainder down the side of the water bottle to help it melt - It was after this, when driving, the ABS light started to come on
This made me think that some of the boiling water had somehow gone into the wiring loom and shorted something out, possibly where the power steering pump is located
Yesterday, I ended up taking the water bottle out, and inspecting things around the power steering pump, but all looked to be ok
I went back to the ABS sensor and started to take the wiring loom apart to inspect for breaks or shorts, this was not so straight forward for me because I had previously made a repair a few years back and covered it with hot glue - will not do this again
Anyways after messing around with the wiring I found a break in it just above the plug, so fixed that and put it back together, took it for a short drive and no ABS light came on, so a big relief, it seems to be fixed
I am still not sure, what the original cause of this was, but the confusing thing for me, is that the OSF sensor seemed to be bad with a reading of 176.3k ohms, but it is too coincidental that it started with me pouring water down the windscreen water bottle - which is something as well I will not do again!
The other thing that may have caused me additional confusion / problems - and maybe someone can clarify, are the wires that go to the ABS sensor polarity sensitive +/- ?
Anyways, it is fixed now!
Thanks again guys!
legepe

[shtu]

I would try and get it correct if it's easy to do, but it almost certainly won't matter. It's just a hall effect sensor, the waveform being 180 degrees out should be insignificant.

[BerlingoCitroen2011]

Hi everyone, I need to replace the rear ABS wheel speed sensors on a 2011 Citroën Berlingo 1.6 HDi.
I’ve heard there is a small access hole in the hub/pillar that allows reaching the sensor bolt without removing the brake disc or caliper.
What is this hole officially called?
Also, I usually replace parts in pairs (like spark plugs), so I’m planning to change both rear sensors at the same time. Is that recommended, or is it okay to replace only the faulty one?

[brodfather11]

If I remember right it is easily got at , use an allen key and just pull it out. Cant remember any hole to get at it, but it may be tight in the mounting hole and need some persuasion to come out. If no need to change the other side just leave it.

[Multispacer]

Hi everyone, I need to replace the rear ABS wheel speed sensors on a 2011 Citroën Berlingo 1.6 HDi.
I’ve heard there is a small access hole in the hub/pillar that allows reaching the sensor bolt without removing the brake disc or caliper.
What is this hole officially called?
Also, I usually replace parts in pairs (like spark plugs), so I’m planning to change both rear sensors at the same time. Is that recommended, or is it okay to replace only the faulty one?

Firstly, regarding the line in your post "I need to replace the rear ABS wheel speed sensors on a 2011 Citroën Berlingo 1.6 HDi" 

What draws you to the conclusion you need to change both the rear ABS sensors, as it would be very unusual that they would both fail? Have you had some sort of diagnostics carried out [on correctly compatible PSA diagnostics] that shows a fault code that both are faulty?

Which brings me to the second part of your question. The ABS sensors are all independent of each other, so if you have a sensor showing as faulty, you only need to replace that one.

Finally, the sensors on the Berlingo are held in by one bolt, which is either an allen key or torx head [I cannot remember which] but it is a bit of a poor design. in that the sensor sits in a recess in the caliper housing and what commonly happens is over time, you get a rust build up underneath the sensor which 'flexes' the plastic housing of the sensor away from the wheel hub and you get a fault reading. A fix in many cases is to remove the sensor and scrape out the recess with a small screwdriver or suchlike and then refit the sensor into the housing. This fixed my sensor fault on a front wheel.

Also, I remember from other posts on the forum in the past, that the ABS loom running along the rear axle can also suffer from corrosion high resistance that can give ABS faults.