Xantia ABS light....

josamolly · Post by **josamolly** » 29 Nov 2006, 11:22

I have an 'M' reg Xantia diesal and its just failed the mot as the ABS warning light stays on. Now, having read a bit i know that the ECU is a fault in these and my question is whether its worth getting another from a donor car..

What is the probability the the ECU is the likely cause? and if not, waht else could it be?

andmcit · Post by **andmcit** » 29 Nov 2006, 11:39

95% chance it's one or more wheel sensors - it may not even be a duff
sensor but a connection to one. Try to get readings from the pins on the
multi plug that is attached onto the top of the ECU.

I'll post the pin sequence when I find my reference!!

Andrew

jeremy · Post by **jeremy** » 29 Nov 2006, 11:58

I agree with Andrew - but ECU can be repaired if it really is at fault. As they are prone to problems there is no reason that a second hand one will be any better than your own.

http://www.carelect.demon.co.uk/

http://www.bba-reman.com/

However you must test the sensors and associated wiring first - and if a sensor lead has gone you may be able to graft in a suitable bit of co-ax cable if you are handy with a soldering iron and insulation.

slim123 · Post by **slim123** » 29 Nov 2006, 12:05

For the sensors and as Andrew says it will probabally be one, try this.

Ensure ignition is off.
Unplug the muliti plug from the ABS ECU.
Use an OHM meter to take these readings.

Pins No 15 and 30 = Left hand front sensor

Pins No 1 and 6 = Right hand front sensor

Pins No 19 and 28 = Left hand rear sensor

Pins No 29 and 31 = Right hand rear sensor.

All readings should be 1080 OHMS approx, in reality if you get no reading then the sensor is duff. But it is allways worth cleaning the connections.

If you shine a maglight at the pins you should be able to see the numbers of the pins.

Good Luck
Slim

andmcit · Post by **andmcit** » 29 Nov 2006, 13:47

Thanks for the pin out numbers Slim! I seem to have deleted my reference...

Andrew

josamolly · Post by **josamolly** » 29 Nov 2006, 16:03

thanks guys.. i'll give it a go and see what happens..

awg2 · Post by **awg2** » 30 Nov 2006, 09:38

I have identified an open circuit on front nearside (LH) sensor on my Xantia but have been unable to find where about the connector is between the wheel and the bottom of the ecu. Can anyone tell me where I should be looking - in the wheel arch, close to the ECU or somewhere inbetween?

andmcit · Post by **andmcit** » 30 Nov 2006, 09:45

The connections are buried down on the main lower crossmember towards
either end of the steering rack.

follow the feed wiring off the hub, through where it's held in a flat bracket
at the top point of the wheelarch with the usual severed brake wear sensor
lead, and it then drops down the rearward face to the main chassis - it'll be
about 5-6" in from the wheelarch's face. It runs through a small plastic Ω clip
and then you';ll see the multiplug with a spring clip.

Andrew

slim123 · Post by **slim123** » 30 Nov 2006, 10:19

In my humble experience,

It's allways the N/S front!!!!!!

Regards
Slim

josamolly · Post by **josamolly** » 02 Dec 2006, 18:36

right guys,.. did the testing and it appears to be the first one, left side front..

stupid question but is that left side facing out of the car or looking from the front...

thanks for your help as always.

deian · Post by **deian** » 02 Dec 2006, 19:16

Left side, facing out... (passenger side of the car if you drive on the left), also called nearside (n/s)... as Slim123 mentioned this is more common to fail... why? well my theroy is as it's nearer the side of the road where there are puddles and potholes, it will fail sooner than the other side.

Now I will feel silly if I am wrong now! Especially about the sides!

josamolly · Post by **josamolly** » 03 Dec 2006, 17:14

thaks deian, told you it was a silly question...

citroenxm · Post by **citroenxm** » 04 Dec 2006, 21:54

Hi all

Anyone got the pin outs for SERIES TWO Xantias?? They use a different ECU and sensor system?

Thanks in advance

Regards
citroenxm

andmcit · Post by **andmcit** » 04 Dec 2006, 22:14

found on my travels in webland and ferreted away for future reference...

Andrew

Mandrake · Post by **Mandrake** » 04 Dec 2006, 23:22

deian wrote:Left side, facing out... (passenger side of the car if you drive on the left), also called nearside (n/s)... as Slim123 mentioned this is more common to fail... why? well my theroy is as it's nearer the side of the road where there are puddles and potholes, it will fail sooner than the other side.

That,

And the fact that on average, a car that drives on the left hand side of the road turns sharper on left corners than right corners - left hand outer CV joints tend to wear out sooner than right hand ones for the same reason...

Regards,
Simon