Hi there to all

Have a 2009 RRS supercharged with the following problem.

ARCM no comunication
Anti roll light at the dash in yellow and there is no way to reset it.
ABS dash light continuoslly on
Cranking noise coming from the rear stability bar when cornenring.

Have checked the F9 fuse, as well as main relay.
Also have the following code pulled out with the Hawkeye diagnostic tool.
DTC: C1A00 ECU internal failure.
DTC: U0434 Invalid Data received from antio roll control module.

Question here is: Does the ARCM has a history of been a faulty control module?

Thanks in dvance for your kind supoport and be awarded that english is not my mother thongue, hence will try to do my best to comunicat.

Regards
Ray

The ACE system on the sport is pretty reliable on the whole (granted the system eats bushes and has a habit of clanking). If the system breaks it's usually a leaking roll bar, the ECU failing is just bad luck I think

Have found a damaged rear sway bar, may it be that the control module gets in to protection mode for this damage? Or should I dig for more info about this issue?

Regards
Ray

There's physically no way that the rear sway bar failing would damage the ecu. I would check the connections to the ecu and see if there's any water damage or if a plug isn't seated properly.

FYI, pretty much all the sway bars leak a little oil. So unless it's actually physically damaged and not squirting oil everywhere I would say that it's serviceable and doesn't need changing.

Found this sway bar to have a longitudinal movemenet.
Fail happends under hig torsion at the rear bar (irregular terrain)
What causes me a problem is why module as to fail if it is not a common part to fail?
Module has been inpected for whater or moisture and seems to be ok.
Also may a short in the valve selenoids initiates a fail in the module?
Is there any spec regarding resistance to check the selenoid located at the hidraulic valve?

Regards
Ray

When you say longitudinal movement do you mean the full unit moves or half of the unit slides while the other doesn't ? The way the bars create torsion is they expand and contract, so the bar itself is 'floating' and will move to allow for the expansion/contraction of the unit. The full bar should be a solid mass though.

There are values for the voltages fed to the solenoids etc, I'm not aware of them, however if a solenoid had failed/shorted that would throw a different fault and I'm not sure that a failed/shorted wire to the solenoid would cause the ecu to fail, however I wouldn't say it's impossible.

This post has a lot more info on the full ace system:

http://www.rrsport.co.uk/gallery/albums/us...tem%20.pdf

Part number for the control module: NNW508200

Yes the bar has some longitudinal movement of about 2cm
I can not see the mentioned part number in the module, however I am asuming is the one at the attached picture.

exopar wrote:

DTC: C1A00 ECU internal failure.

Code C1A00 was found in the ARCM module as well as U0434.
Will clear all the pending codes in all the systems and try to scan again to see if something has changed.

Regards
Ray

AS an aditional info, all the codes has been erased and still DTC1A00 ECU Internal Failuer persist.
Noticed it can be errased with ignition switch in position 2 but returns as soon as vehicle is started.
No other DTC can be found in any other module or system.

Is the ARCM a direct replacement or it has to be activated/flashed in order to work?

The Dynamic Response module has two tunes in it: one for the 2.7 diesel and petrol models, and one for the TDV8. Not sure if the system picks it up automatically though. 2012 SDV6 - it's missing a couple of cylinders
2008 TDV8 - it was a labour of love and is much missed

Finally the problem was solved, a faulty ARC module was the main cause of all the light at the dash.
A spare second hand part was installed, all codes errased
Vehicle cames almost to it´s normal state however noticed a noice at the trasfer case just few seconds after turn off engine.

Does anybody has experienced something like this? Noise seems to came from the transfer case.

Also when tifgt cornering rear diff felts like havy maybe for the rear LSD clutch to be damaged, hence a fluid change should be my fist aproach?

Regards
Ray

I had similar problems, but no funny noises.
It turned out to be 2 chewed wires 1 at the anti roll bar module and 1 slightly lower in the wiring loom.
I had to dig around searching for several hours after finding 2 x 1cm pieces of chewed off can wire.
The suspension red light and the red brake exclamation light where no longer on all the time after I repaired the wires.