Xantia ABS Fault finding

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Xantia ABS Fault finding

Postby avatar » Mon Aug 05, 2002 5:32 pm

Am about to locate a fault in the ABS of my Car 1993 1.9TD SX. I know the relevant pins in the Multi plug, connecting to the ABS ECU, for the roadwheel sensors. Can any one tell me the function of the rest of the pins ? I am sure they must be earthing, 12 v feed etc.
For what its worth my money is on a faulty sensor or poor earth somewhere
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david webzell
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Postby david webzell » Tue Aug 06, 2002 5:48 am

Hi when I was fault finding on my ABS system(xantia 1.9 TD SX 1993)
I contacted citroen uk and they sent me a copy of the circuit diagrams
showing sensors and other connections.
My fault ended up being a ECU fault, caused by a diagnostics unit,which damaged the voltage regulator internally.
Hope this is of help.
Dave
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NiSk
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Postby NiSk » Tue Aug 06, 2002 1:03 pm

Here's a copy of the ABS system for the XM, unfortuanately there doesn't seen to be one for the Xantia on that site, but I can't think that Citroen would use two entirely different systems for cars built at the same time (??? !!).
http://citroeny.cz/servis/xmser/elektro/schema_ABS.jpg
It corresponds with the wiring on my '93 XM TD12, anyway.
//NiSk
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Postby avatar » Fri Aug 09, 2002 3:52 pm

OK problem located failed Rear Near Side ABS sensor so of to ANdyspares to get a replacement.
Thanks to all who replied
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Postby avatar » Fri Aug 09, 2002 3:55 pm

Your supposition was correct Citroen do appear to have used a different system,wiring at least !
However thanks for the pointer to a useful site
<BLOCKQUOTE id=quote><font size=1 face="Verdana, Arial, Helvetica" id=quote>quote:<hr height=1 noshade id=quote>
Here's a copy of the ABS system for the XM, unfortuanately there doesn't seen to be one for the Xantia on that site, but I can't think that Citroen would use two entirely different systems for cars built at the same time (??? !!).
http://citroeny.cz/servis/xmser/elektro/schema_ABS.jpg
It corresponds with the wiring on my '93 XM TD12, anyway.
//NiSk

<hr height=1 noshade id=quote></BLOCKQUOTE id=quote></font id=quote><font face="Verdana, Arial, Helvetica" size=2 id=quote>
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Postby avatar » Mon Aug 12, 2002 4:44 am

Attempted to replace the sensor this afternoon but it will not budge. Is there a way of freeing it without removing the rear disc and tapping out the sensor ?
<BLOCKQUOTE id=quote><font size=1 face="Verdana, Arial, Helvetica" id=quote>quote:<hr height=1 noshade id=quote>
Am about to locate a fault in the ABS of my Car 1993 1.9TD SX. I know the relevant pins in the Multi plug, connecting to the ABS ECU, for the roadwheel sensors. Can any one tell me the function of the rest of the pins ? I am sure they must be earthing, 12 v feed etc.
For what its worth my money is on a faulty sensor or poor earth somewhere

<hr height=1 noshade id=quote></BLOCKQUOTE id=quote></font id=quote><font face="Verdana, Arial, Helvetica" size=2 id=quote>
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alan s
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Postby alan s » Mon Aug 12, 2002 5:20 am

If you scroll down to the second last photo on this link you'll find a shot of a BX 16V ABS sensor.
If it's the same as that, it's held in by a 10mm (I think from memory) bolt that can be a bit rusted in. The actual mounting is a hole that the black part is located in and it can tend to get rusty and "grow" on to the sensor. I soaked in WD40 and then a couple of drops of oil, grabbed with a spanner & carefully wriggled to & fro until it came loose at which time it just slid out. Be careful as they have a habit of snapping if seixed in really hard; worse case scenario is that the mounting snaps! You'll notice that I put a coating of grease on mine when I reinstalled them to avoid a repeat somewhere down the track.
http://www.aussiefrogs.com/snippets/grease.htm
If they're different, I've no doubts you'll see the difference from the pics.
Alan S
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Postby avatar » Mon Aug 12, 2002 3:54 pm

The securing bolt came out quite easily and I could manage to rotate the sensor slightly after copius use of penetrating fluid but could get no movement to and fro to remove the sensor. Maybe I will let the fluid work its magic for a day or so but I have a deadline as the MOT renewal date looms !
Incidentally in the picture you referred me to the sensors look slightly differnt the magnet is not completely enclosed in a plastic covering. This is probably only cosmetic
Many thanks for the response .
If you scroll down to the second last photo on this link you'll find a shot of a BX 16V ABS sensor.
If it's the same as that, it's held in by a 10mm (I think from memory) bolt that can be a bit rusted in. The actual mounting is a hole that the black part is located in and it can tend to get rusty and "grow" on to the sensor. I soaked in WD40 and then a couple of drops of oil, grabbed with a spanner & carefully wriggled to & fro until it came loose at which time it just slid out. Be careful as they have a habit of snapping if seixed in really hard; worse case scenario is that the mounting snaps! You'll notice that I put a coating of grease on mine when I reinstalled them to avoid a repeat somewhere down the track.
http://www.aussiefrogs.com/snippets/grease.htm
If they're different, I've no doubts you'll see the difference from the pics.
Alan S

[/quote]
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Postby avatar » Tue Aug 13, 2002 10:09 pm

New sensor now fitted and MOT passed. Eventually removed the old sensor by breaking it, carefully, and removing from carrier piece by piece.
I am sure that citroen could not have devised a more awkward wiring route if they had tried !
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alan s
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Postby alan s » Wed Aug 14, 2002 1:52 am

<BLOCKQUOTE id=quote><font size=1 face="Verdana, Arial, Helvetica" id=quote>quote:<hr height=1 noshade id=quote>
I am sure that citroen could not have devised a more awkward wiring route if they had tried !
<hr height=1 noshade id=quote></BLOCKQUOTE id=quote></font id=quote><font face="Verdana, Arial, Helvetica" size=2 id=quote>
I hope they don't view that as a challenge<img src=icon_smile_shock.gif border=0 align=middle>
Glad to see it all worked out in the end as far as the MOT was concerned.
Alan S
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