The Simpson Desert in a D3

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Originally Posted by matti4556

C1A73-1C front right height sensor mechanism ... Circuit voltage out of range.
C1A74-1C rear left height sensor mechanism ... Circuit voltage out of range.
C1A75-1C rear right height sensor mechanism ... Circuit voltage out of range.
C1A07-62 cross articulation ... Signal compare failure.

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rrsport.co.uk list a TSB for height sensors prior to vin 9A502505 for LA (Disco) vehicles that can trigger this same set of faults plus the front left. Manufacture process improvements for the sensors were introduced with that vin. Is your vin prior to this?

My D4 rocked badly going slowly across bumps and ruts near where I turn to reverse up to my house until the shocks were replaced recently with current D4 shocks. I suspect the cross-link valves were opened trying to improve the ride but had the opposite effect. Monitoring the cross-link valves was on my to-do list to see if they were indeed opening but the vehicle no longer rocks so no point.

If your vehicle has the earlier sensors then perhaps the rocking combined with LLAMS making the sensors operate out of their normal range triggered the known fault in the sensors.

Thanks Graeme, makes sense. My VIN is 9A497881 so the faults are plausible as you note. I wonder what the improvements were? Time to trawl yet another forum - I didn't realise how educational a D3 could be!? :D

SSM39634 - a special service message rather than a TSB.

Does this affect the RRV or RRS?

I couldn't load the pdf but here's the text:

Air Suspension Height Sensor Modifications.
Models LA - Discovery 3
LS - Range Rover Sport
Title Air Suspension Height Sensor Modifications.
Last Modified 11-NOV-2008 13:05
Category Chassis
Symptom 304000 Suspension System Issue:
The air suspension warning lamp may illuminate causing the ride height to become frozen. DTC's C1A03, C1A04, C1A05, C1A06, C1A72, C1A73, C1A74 and C1A75 may also be recorded. Cause:
Manufacturing process improvements have been made to the height sensors to overcome the symptoms previously mentioned. Action:
The improved level height sensors were introduced
Content to production at VIN numbers:
LS 9A199490 LA 9A502505
All service parts are now to the new level. These can be identified by a date code on the end of the sensor (see attachment). The assured date code is 21108 where 211 is the day of the year and 08 is the year.
If any issues of this nature are experienced POST these VIN's or assured date code please submit an ePQR


A USA LR3 owner had the same set of fault codes occur a couple of times on a particular section of road but also had some communication faults that suggested a poor earth somewhere. He replaced 1 height sensor but got the set of faults again so was looking for a different cause. No conclusion was posted.

Enjoyed the helpful posts, Matti.

Question: Assuming you did the same trip without LLAMS, using the standard off-road height setting when necessary, what problems would you have experienced, and would it have made a great difference not to have LLAMS?

Thanks,
Wasa

wasa57, thanks. I really don't think the issues were llams related. The sensors would have gone out of range regardless of what height it was set at. The "wombat holes" we're spaced so that the vehicle was going to rock from side to side (causing the wild swings in sensor readings) A vehicle with an open front diff and no TC will degrade the track even further whenever a wheel lost traction going into a hole and just dig more sand out and on it goes, just digging deeper wombat holes. When you are committed to a long dune climb, on a one lane track, trying to avoid the spinifex type brush ready to bite you on both sides, you just grin and bear it :) The vehicles towing large trailers were the culprits on this trip. I can't wait for trailers to be banned in the Simpson Desert. They have banned fires in some Aboriginal Parks, so why not ban trailers that stuff up the environment out there more than a camp fire.
Llams was a godsend when fully laden on high speed undulating roads as it gave a good amount of bump stop clearance. I just added one click and kept driving. I have had it on the beach since in similar conditions and no issues after following Graeme's advice to have it on Fade-out mode. Without Llams I guess I would have just driven slower. The D3 does lull you into driving too fast for conditions so you have to remain alert to that.