Xantia Diesels - How to kill the ABS ECU.

xmexclusive · Post by **xmexclusive** » 12 Mar 2010, 19:01

Just came across a Citroen fault note concerning ABS fitted Xantia diesels.
If you have to remove the instrument panel it is important not to operate the ignition switch while the instrument panel is disconnected. Turning the ignition switch in this state will cause the injection pump shut-off solenoid to generate an induced voltage. This induced voltage then fries a component in the ABS ECU. With this fault present the ABS warning lamp and the battery charge warning lamp will remain lit. The engine will also continue to run when the ignition is switched off.
To avoid this problem during maintenance disconnect the ABS ECU as well as the instrument panel before using the ignition switch.
Sorry if this has already been covered, just let me know and I will stop posting the odds and ends I come across.

John

spider · Post by **spider** » 12 Mar 2010, 19:44

That's a good tip if its true

By the sounds of it the back voltage induced when the field collapsed (same way an electromagnet works) , there "ought" to be a diode in the line to prevent that, almost seems like a design issue really...

Post by **CitroJim** » 12 Mar 2010, 20:04

xmexclusive wrote: Sorry if this has already been covered, just let me know and I will stop posting the odds and ends I come across.

John, these "odds and ends" as you describe them are very interesting and valuable so keep posting them!

I've run both a 2.1TD and an Activa with the instrument cluster removed with no adverse effects so I guess this applies to the 1.9TD with the fully mechanical pump.

xmexclusive · Post by **xmexclusive** » 12 Mar 2010, 22:10

Hi Jim

Should have given the reference.
Citroen Info-rapid Xantia 1 no. 25 dated 5 April 1994.

The Xantia 1 info-rapids that I have start at no. 1 (18/5/93) through to no. 109 (9/4/01).
Headed as no. 1 means engine information.
In the same series:
no. 2 covers gearbox information (2-28).
no. 3 suspension information (1-17).
no. 4 power steering (1-4).
no. 5 brakes (1-12).
no. 6 hydraulic supply (1-12).
no. 7 bodywork (1-13).
no. 8 internal fittings and services (1-48).
no. 9 accessories (1-39).

No time spare to list them all but as an example that final one;
Xantia 9 no.39 (29/12/00) covers Horn failure on phase 2, the cure being fit 1.5mm spacers between the airbag module and the radio controls to eliminate interference.

John

citroenxm · Post by **citroenxm** » 13 Mar 2010, 09:18

Thats rather interesting...

Im just sitting here trying to think if I have ever done it.. but cant recall if I have..

I have on a 1994 VSX breaker up the top, theres no clocks or anything, but it still starts and drives.. however, the ABS was not working because two sensors were faulty..
Theres no point putting the instruments back in because the ABS light is already lit, or removed...

Paul

jgra1 · Post by **jgra1** » 13 Apr 2010, 13:56

I finally decided to do something about my ABS .. the charge and the ABS lights have been on (and off) together since before I owned the car.. I thought someone had cross wired them .. this is very useful John.. so I guess I need an ABS ECU ... then some sensors I should think

John

citroenxm · Post by **citroenxm** » 13 Apr 2010, 15:05

May be able to Help there John...

What year is she?

Paul

jgra1 · Post by **jgra1** » 13 Apr 2010, 16:04

99 Paul

does the ecu seperate from the abs block?

citroenxm · Post by **citroenxm** » 13 Apr 2010, 21:08

On Series one cars up to 1997 Yes they did seperate...

Ive not looked at S2 ABS Blocks and ECU's though, I do have a spare off a working car and system.

Paul

jgra1 · Post by **jgra1** » 14 Apr 2010, 10:33

I missed this Paul..

what do you want for it ?

Post by **CitroJim** » 14 Apr 2010, 11:06

jgra1 wrote:what do you want for it ?

John,

I expect Paul would be very happy with a Hydractive Xantia fitted with a TCT engine

I am now going to run away and hide.....

citroenxm · Post by **citroenxm** » 14 Apr 2010, 12:43

Oi....

come back!.... ill get you! you wait!

It wouldn't be for me anyway, I have a very, what I think is decent TD with my 1994 SX WITH anti sink... which just passes every MOT!

PAul

citroenxm · Post by **citroenxm** » 14 Apr 2010, 12:44

jgra1 wrote:I missed this Paul..

what do you want for it ?

Replied for now, on your other thread John..

Paul

jgra1 · Post by **jgra1** » 14 Apr 2010, 12:58

ahh I see, i put my wanted ad up, an hour before your reply on here..

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Xantia Diesels - How to kill the ABS ECU.

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