XM tyres

Post by **xmexclusive** » Sun Oct 05, 2014 2:34 pm

Hi Chris & Mike

The standard ABS problem I am afraid.
Detailed instructions on fault repair that apply only to one particular type of the 3 different XM ABS systems.
The relay repair instructions are for a Teves Mk4 system.
Mikes car has a Bendix system where the relay and ABS diode are encapsulated on a dedicated component board.

I have now located a listed another batch of PSA ABS vehicle systems in the post above.
Up to 25 variants now as each system was modified to suit each particular model.

John

scooters · Post by **scooters** » Mon Oct 06, 2014 9:33 pm

That's interesting. I can recall abs faults on my tzd BX and my old XM. Both mysteriously cleared up after new winter boots are fitted.

White Exec · Post by **White Exec** » Tue Oct 07, 2014 6:38 am

Mike,
You have checked that there's no debris - in particular metal filings/dust - clinging to the magnetic ends of the wheel sensors? This can accumulate, and plays havoc with sensor behaviour. Sorry if asking the obvious.

citsncycles · Post by **citsncycles** » Tue Oct 07, 2014 9:59 am

No I haven't. The reason I think it's voltage related is that the battery is rather old (7 years according to the history that came with the car), and the issues usually happen when it's been stood a couple of days. With the daily runs it's had the last few days it's fine, although the Hydractive light has decided to stop lighting up now (although the message on the screen still comes up). This latter I think is a dodgy connection somewhere that I have to hunt out.

dollywobbler · Post by **dollywobbler** » Tue Oct 07, 2014 2:55 pm

Nice to know that XM owners can topic-drift just as well as other Citroen owners!

Has been an interesting read though. Hoping to get my hands on my own XM within a week or so.

Post by **Dieselman** » Tue Oct 07, 2014 7:25 pm

dollywobbler wrote:Nice to know that XM owners can topic-drift just as well as other Citroen owners! Has been an interesting read though. Hoping to get my hands on my own XM within a week or so.

as Septic peg would say "I'm seeing a Mercury car"...

Post by **Peter.N.** » Tue Oct 07, 2014 7:51 pm

Only down to the tolerance of the moderators.

Post by **xmexclusive** » Wed Oct 08, 2014 9:43 am

Consider that when the ABS is running its start up test the starter motor is also engaging as well as the glow plugs running.
So if the battery cannot put out enough volts and amps the car will not be able to start.
I suspect that low volts on the ABS ECU is a red herring.

I have added a bit more info to the rouge ABS posting.
This will get copied into a proper ABS post one of these days.

John

stinkwheel · Post by **stinkwheel** » Wed Oct 08, 2014 2:09 pm

I used to find with my old CX's that if the abs light didn't go off properly first go, switch off, re-start, job done - definitely a battery voltage issue.

Post by **xmexclusive** » Wed Oct 08, 2014 5:16 pm

Having just look at the CX Bosch wiring diagram I suspect that your CX had a weak oil pump not a battery problem.
Very strange design but that version of ABS monitored the engine oil pressure switch.
By second start the oil pressure would have built more.

John

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