C4 (2005) - ABS light.

gordone · Post by **gordone** » 03 Dec 2020, 20:23

I have problem with the ABS light....
Last years it had come and goes...

But the last year it comes after I have started the engine and the car has been standstill.

I have replaced all four wheel sensors without success...

Today I disconnect the cable from the ABS btake unit, sprayed some electro cleaner, but no success...

Can the next stage to be to measure the resistant the whole loop, from the ABS unit and to sensor?

Where can I find information about the pin layout on the plug on the ABS unit... many cables....

Hell Razor5543 · Post by **Hell Razor5543** » 03 Dec 2020, 20:33

Have you driven it since changing the sensors? If you have not, try that before doing anything further. The ABS system may (as it did on my Xantia) not 'believe' a faulty sensor has been replaced until it can detect the speed the wheels are turning at.

Failing that, if the ABS 'looks' at a magnetic track in the wheel bearing it is possible that one has cracked, causing the problem. I recall (several years ago) Savoy Garage telling me about a Xsara Picasso with an ABS issue and it took them ages to nail the problem down to a crack in the magnetic track in a wheel bearing (which, once it was replaced, cleared up the problem).

wheeler · Post by **wheeler** » 03 Dec 2020, 20:54

gordone wrote: ↑03 Dec 2020, 20:23 I have problem with the ABS light....
Last years it had come and goes...

But the last year it comes after I have started the engine and the car has been standstill.

I have replaced all four wheel sensors without success...

Today I disconnect the cable from the ABS btake unit, sprayed some electro cleaner, but no success...

Can the next stage to be to measure the resistant the whole loop, from the ABS unit and to sensor?

Where can I find information about the pin layout on the plug on the ABS unit... many cables....

The first thing you need to do is have the ABS system read for fault codes as a starting point.

gordone · Post by **gordone** » 03 Dec 2020, 20:56

Thank you

Can I get a cheap error reader from ebay?

Hell Razor5543 · Post by **Hell Razor5543** » 03 Dec 2020, 21:22

I would not use a cheap reader, as they usually struggle to 'understand' Citroen and Peugeots (well, don't we all!). However, a proper Lexia/DaigBox system can pretty much do everything a dealership system can do (not everything, but a LOT more than a generic code reader). It is a shame you are not in the UK, as there are lots of Forum members with such equipment, and who are willing to help out.

gordone · Post by **gordone** » 03 Dec 2020, 21:51

I understand...

What about these?

https://www.ebay.com/itm/Koffer-Com-PSA ... SwXOBbkmYG

Hell Razor5543 · Post by **Hell Razor5543** » 03 Dec 2020, 21:52

Sorry, but I cannot offer an opinion (or speak/read French!).

gordone · Post by **gordone** » 19 Feb 2021, 19:10

Finaly I got a reader

Full export log to be found here:
https://smallpdf.com/result#r=63af757f7 ... e-document

Can it be that is it fault code FC43 Fault ( F4C3 ) : Brake fluid level fault (Signal not coherent or level too low)

Who causing my "brake fault" alarm and then shutoff the ABS ?

Thank you all for helping me out

wheeler · Post by **wheeler** » 19 Feb 2021, 19:24

You need to go into the ABS system menu & read the faults from there, thats the BSI faults log you have read.

gordone · Post by **gordone** » 19 Feb 2021, 21:09

Thank you!

Have cleared the faults now

It should come back quick, will check then

gordone · Post by **gordone** » 20 Feb 2021, 13:02

I started the engine and was driving 50 meteres and come the "brake fault" and ABS light on again...

When I try to take out fault code on the ABS nothing apear in the list, please see attatched photos below:

Post by **RichardW** » 20 Feb 2021, 13:21

Try with Diagbox rather than Lexia. Is this a diesel or a petrol?

gordone · Post by **gordone** » 20 Feb 2021, 14:42

Petrol

gordone · Post by **gordone** » 20 Feb 2021, 15:15

Thank you, then I found a error, but need some advise from you people how to deal with it...

As I have informed about these issue have been there for 3-4 years, when it occur in the start it was coming and going... and then it was present for long time, and den sundely it disapear... for a while... and not it has been stable on for long time...

I don`t know if these is telling someting about what can cause it?

When I`m googling it seems that many have had issue with the ABS relay? diodes?

Post by **RichardW** » 20 Feb 2021, 16:30

Post up the RP number of your car (on the door post sticker), and the details, and I'll see if I can find a wiring Diagram. I found one for about your age of car which shows 3 feeds - one via Fuse 7 on the underbonnet fuse box, the two others via maxi fuse 2 and 3 (which are under the fuse box). I would check that all these are intact first. If we can find a wiring diagram, then you can check for the presence of 12V at the ECU plug - but my guess would be the pump in the ABS unit has had it.....

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C4 (2005) - ABS light.

C4 (2005) - ABS light.

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Re: C4 (2005) - ABS light.

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Re: C4 (2005) - ABS light.

Re: C4 (2005) - ABS light.

Re: C4 (2005) - ABS light.

Re: C4 (2005) - ABS light.

Re: C4 (2005) - ABS light.