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exopar



Member Since: 23 Aug 2017
Location: Puebla
Posts: 8

Mexico 2009 Range Rover Sport Supercharged Zermatt Silver
2009 RRS Anti Roll system fault

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

Post #533617 Wed Aug 23 2017 5:37pm
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Socast



Member Since: 25 Sep 2014
Location: Somerset
Posts: 520

United Kingdom 2006 Range Rover Sport Supercharged Santorini Black

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 Sad

Post #533678 Thu Aug 24 2017 12:54pm
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exopar



Member Since: 23 Aug 2017
Location: Puebla
Posts: 8

Mexico 2009 Range Rover Sport Supercharged Zermatt Silver

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

Post #533698 Thu Aug 24 2017 4:22pm
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Socast



Member Since: 25 Sep 2014
Location: Somerset
Posts: 520

United Kingdom 2006 Range Rover Sport Supercharged Santorini Black

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.

Post #533699 Thu Aug 24 2017 4:33pm
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exopar



Member Since: 23 Aug 2017
Location: Puebla
Posts: 8

Mexico 2009 Range Rover Sport Supercharged Zermatt Silver

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

Post #533700 Thu Aug 24 2017 4:47pm
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Socast



Member Since: 25 Sep 2014
Location: Somerset
Posts: 520

United Kingdom 2006 Range Rover Sport Supercharged Santorini Black

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

Post #533703 Thu Aug 24 2017 5:08pm
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exopar



Member Since: 23 Aug 2017
Location: Puebla
Posts: 8

Mexico 2009 Range Rover Sport Supercharged Zermatt Silver

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.

Post #533709 Thu Aug 24 2017 6:01pm
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RRSTDV8



Member Since: 12 Aug 2011
Location: Northamptonshire
Posts: 5428

United Kingdom 2008 Range Rover Sport TDV8 HSE Stornoway Grey
Re: 2009 RRS Anti Roll system fault

exopar wrote:

DTC: C1A00 ECU internal failure.

This error code relates to the Terrain Response module. This is below the rotary control for the Terrain Response system by the gear lever. However, a fault in the TR module doesn't cause any other faults other than an inability to access the off road programmes. Any faults in related systems, however, cause the Terrain Response system to be unhappy so I'd be looking elsewhere first.

The only connection between the Anti roll bar system and the anti roll ECU (called the Dynamic Response Module (DRM)) is electrical. The DRM has a power feed via Fuse 9 in the engine bay fuse box, a CANBUS connection (with which it talks to the other ECUs around the vehicle), wires to/from two accelerometers, wires to/from the dynamic response valve block pressure sensor and the two valves in the valve block. There is also a ground connection.

As the U0434 code is invalid date from the DRM, I'd be checking the connections carefully. There are two plugs in to the DRM. The DRM is situated on the driver's A pillar behind the dashboard. You can access it via the driver's footwell. Check the individual wires going in to the plugs are correctly seated. Check the earth points are all tight too. There are several around the vehicle.

The noise from the anti roll bar could just be the bar acting in "locked bars" mode which just means it behaves like a normal anti roll bar. This would happen if the system was suffering a fault.

One of the side effects of the way the various systems interact is that a problem in one system can manifest in another. For example, a fault in the steering angle sensor can cause a Dynamic Response fault to be recorded. Similarly with the ABS module. 2012 SDV6
2008 TDV8 - it's a labour of love

Post #533710 Thu Aug 24 2017 6:09pm
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exopar



Member Since: 23 Aug 2017
Location: Puebla
Posts: 8

Mexico 2009 Range Rover Sport Supercharged Zermatt Silver

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

Post #533714 Thu Aug 24 2017 6:29pm
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exopar



Member Since: 23 Aug 2017
Location: Puebla
Posts: 8

Mexico 2009 Range Rover Sport Supercharged Zermatt Silver

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.

Post #533722 Thu Aug 24 2017 7:23pm
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exopar



Member Since: 23 Aug 2017
Location: Puebla
Posts: 8

Mexico 2009 Range Rover Sport Supercharged Zermatt Silver

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

Post #533725 Thu Aug 24 2017 7:25pm
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RRSTDV8



Member Since: 12 Aug 2011
Location: Northamptonshire
Posts: 5428

United Kingdom 2008 Range Rover Sport TDV8 HSE Stornoway Grey

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
2008 TDV8 - it's a labour of love

Post #533736 Thu Aug 24 2017 8:32pm
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