Lexia or KWP2000? Retro fitting Cruise Control on a Xantia?

[xmexclusive]

Hi Jim & Addo

That last photo of Addo's is very interesting.
The yellow plug is identical to the XM one so perhaps we should check the wiring.
I will try and do this later today.
The Lucas catch up on the electronic cruise was a bit traumatic.
On the 2.1BTE XM they were well over a year behind Bosch.
Even then those early EPIC vehicles used some Bosch components including the throttle pot suggesting development rather than completion.
As Vac cruise had already been in production on the 2.1ATE XM I suspect Citroen continued to use that system despite the EPIC capabilities.
I believe that 2.1 EPIC electronic cruise was fitted to some other Citroen models.
I will see if I can find who reported this.
This has raised the question in my mind about the late (1997) new engine V6 XM.
This must have cruise so I need to get a look at one to see what type.
Also what make of engine ECU does it use?
Now if it is Bosch based that would be very interesting to follow up on.
Must look out for one to pull to bits and also liberate a V6 Xantia engine ECU to compare the EPROMS.

John

[xmexclusive]

Hi techtechnique

All I am adding in at this stage is details of the early electronic cruise version.
I saw this as a missing bit of technical development that Citroen used between 1994 and 2000.
My personal Citroen model interest is very focused on one particular car and engine.
All I can say is that the first of the HDi engines were being put into production at this time.
I suspect that 2.5TD style hard wire control was used preproduction rather than multiplexing.
Have to rely on documentation for much of my other model information.
Searching that paper mountain can be quite hard work.
I find that people tend to be a bit careful about letting me examine cars that interest me technically.
It seems I can give a new meaning to the term kit car.

John

[xmexclusive]

Hi Addo

From the look of the shadows your plug has only 4 contact wires, 2 pairs of 2 at the bottom right?
If so then that is identical to the wire pattern installed in a 2.5TD XM.
Yellow plug size and polarisation is identical.
Perhaps we should send you a set of XM switches to test out.

John

[red_dwarfers]

My 2.1 VSX XM is an early EPIC with the Bosch pot. A little while ago I did look for signs of a cruise stalk plug but it wasn't fitted as far as I could see. It would be interesting to see a 2.1 EPIC with cruise on the Xantia/XM.

[techtechnique]

Sorry, what's EPIC?

Sent from my HTC Desire using Tapatalk

[xmexclusive]

EPIC was the LUCAS fly-by-wire diesel engine control system .
Dates from about 1996 and was fitted by Citroen to some diesels until 2000.

John

[Chris570]

Sorry to dig this one up, buuut, would it be fair to assume that if i had the wiring and i plugged up the stalk and switch (and also a clutch switch) on my HDi it *may* start working?

[DickieG]

Sorry to dig this one up, buuut, would it be fair to assume that if i had the wiring and i plugged up the stalk and switch (and also a clutch switch) on my HDi it *may* start working?

Difficult one Chris, HDi Xantia's are a bit of a mongrel really as they don't have Multiplex wiring but have a fly by wire accelerator so quite how you'd connect it all up is unknown to me. I do know that when a new Xantia HDi ECU is programmed there is a box to tick if cruise is fitted but how it's all connected up is another matter all together, would it be the old fashioned way of vacuum pulling on the accelerator cable or fly by wire

[Chris570]

the logical way that i can think is that the engine ecu takes the function of the old cruise ecu so instead of the vacuum system the ecu just does it all.

is there a way of getting to that menu once the ecu has been installed?

[DickieG]

is there a way of getting to that menu once the ecu has been installed?

AFAIK ECU's can only be programmed once, the other issue being where would connect the cruise switch/s to?

[Chris570]

well i wonder if the wiring loom already covers that. Does anyone have the ecu pinout for the HDi ecu....

[PIT]

I have a gift for you
Cruise Control schematic for Peugeot 406 HDI without BSI


This can also be made on Xantia, but not on all ECUs. The older ones do not have option to activate it.
I have just purchased a newer ECU that should have this possibility. Later I will try to copy only the software to an older ECU, to see if it can run this way.

[CitroJim]

This can also be made on Xantia

No it can't!

All Xantias originally fitted with cruise used the Hella electropheumatic system with a mechanical linkage to the throttle butterfly. There is no provision in any Xantia ECU for 'fly by wire' cruise as utilised in the 406 circuit as show above...

[Chris570]

This can also be made on Xantia

No it can't!

All Xantias originally fitted with cruise used the Hella electropheumatic system with a mechanical linkage to the throttle butterfly. There is no provision in any Xantia ECU for 'fly by wire' cruise as utilised in the 406 circuit as show above...

I wouldnt be so quick to dismiss that Jim. If the 406 HDi ECU has the provision for it in it's programming then why would PSA change it for the Xantia? Also (i'm not sure here) but LHD HDi's may have had it drive by wire. at the end of the day it's all down to the programming, IF the xantia has it then there is no reason that i can see that it cannot be added. (i'm not talking about a legal standpoint here either.)

[CitroJim]

IF the xantia has it then there is no reason that i can see that it cannot be added. (i'm not talking about a legal standpoint here either.)

True enough Chris but show me on the Lexia where you may enable it. I've not seen it. Also, I'm not aware the HDi has the wiring in place for the column stalk. I'm sure we've been here before

If it were possible I would have thought Citroen might have offered it as an option on the Exclusive HDi. As far as I know they didn't. This would have been the only one as apart from the 2.1TD (IIRC) that had a throttle pot rather than a direct bowden cable to the throttle butterfly or load lever as appropriate.