Discovery 3 Suspension faults - needs help with troubleshooting

**mendi1978** · 22nd November 2013, 10:18 AM

Hello everyone,

I purchased a used 2006 2.7 SE TDV6 - Discovery 3 earlier this year from a non-LR dealor (also a generic service/repair centre) in east of melbourne. Havent had any issues until two weeks back when I first saw an amber light for a suspension fault. This fault generally comes after 10 or so minutes of driving. Once this error comes, the height settings do not work any more (e.g. changing from normal height to four wheel height). If I continue to drive the car with the error ON and go above 65-70kmph at a stretch - the AMBER error turns into a RED light, the vehicle lowers down to the access suspension height and ride becomes very very bumpy. Doing a restart of car after a wait of 5-10 minutes removes the error for driving the next 10 minutes again.

Also not sure if it is Ok to continue driving when the suspension is at the lowest height - as the car dash gives warning - max speed of 30 miles/hr.

Took it to the dealor yesterday where I bought this car from, he did some initial diagnostics and found these errors (that he said he sent to land rover tech team to seek assistance from).

ALL TERRAIN CONTROL MODULE
U0402-94 invalid data received from transmission control module
U0421-94 invalid data received from control module

TRANSMISSION CONRTOL MODULE
Lost communication with instrument cluster control module
VEHICLE DYNAMICS CONTROL MODULE
U0421-68 invalid data received from ride level control module
U0132-87 lost communication with ride level control module
RIDE LEVEL CONTROL MODULE
C1a75-1c rear right height sensor mechanism
U01131-92 air supply performance incorrect
C1a06-1c rear right height sensor
C1a07-62 cross articulation
C1a20-64 pressure increase to slow when filling reservoir
C112f-72 air spring valve
C1130-66 air spring air supply
INSTRUMENT CLUSTER
U0132-87 lost communication with ride level control module
U0184-87 lost communication with audio unit
BODY CONTROL MODULE
B1b02-28 low frequency coil
B1c57-14 unused relay drive
B1d12-15 volumetric alarm power circuit

Car doesn’t have a sunroof so no leaks around the dashboard aera have left vehicle up over night and doesn’t go down
The reading are as follows
Ride Heights
Front left 11 front right 7 rear left-9 rear right -47
Front left volt 2.43 front right volt 2.38 r/l volt 2.01
r/r volt 1.33
pressure supply 101 gallery pressure 1433 press supply volt4.91

what he also noticed that c112f-72 air spring supply (actuator stuck open)..

Landrover Tech team have come back this morning suggesting - replacing with a brand new compressor. Cost to me has been quoted to be around $1500 for parts and $300 for labour and the mechanic still not sure if all faults will go away.

I do have a 3 year extended warranty through NWC but I am told this isnt covered under that.

I am not at all skillful when it comes to car repairs (although a mechanical engineer myself)..

...

Any suggestions or help?

**BigJon** · 22nd November 2013, 10:29 AM

Almost certainly going to be a compressor issue. Even with basic skills it is a pretty simple home replacement exercise.

I would push hard for reasons why the warranty doesn't cover it.

**Marmoset** · 22nd November 2013, 10:38 AM

Your rear ride height sensor also looks as though it's faulty or needs recalibrating. This could be the connector/wires corroded or the height sensor itself.

Why does the warranty company think they don't cover it? It's a pretty integral part of the car and quite a major component - I'd challenge them more about not paying out.

**101RRS** · 22nd November 2013, 10:42 AM

Costs also seem a bit high.

**Graeme** · 22nd November 2013, 12:39 PM

Originally Posted by BigJon

Almost certainly going to be a compressor issue.

X2, with the amber light being due to the reservoir pressure
not rising quickly enough after the vehicle has attained the target height then the red light due to not being able to raise the vehicle quickly enough to attain the current target height.

**mendi1978** · 22nd November 2013, 01:48 PM

Originally Posted by BigJon

Almost certainly going to be a compressor issue. Even with basic skills it is a pretty simple home replacement exercise.

I would push hard for reasons why the warranty doesn't cover it.

Thanks BigJon..

I checked with the warranty company and they advised that its not an item thats mentioned on the product cover letter and so isnt covered./...

Disappointing...

Cheers

**101RRS** · 22nd November 2013, 01:55 PM

So the cover does individually mention the other 5000 odd components in the car - I think not. I think you are being told porkies.

**RANDLOVER** · 22nd November 2013, 02:03 PM

If the compressor is making air but not enough or slowly it could be due to a blocked intake. I believe they have a moisture absorbing dessicant on the inlet side. I prefer refrigerated driers myself but that is for larger plant/equip.

**mendi1978** · 22nd November 2013, 02:32 PM

Originally Posted by Marmoset

Your rear ride height sensor also looks as though it's faulty or needs recalibrating. This could be the connector/wires corroded or the height sensor itself.

Why do you think so about the rear height sensor - looking at the pic, is it?

**mendi1978** · 22nd November 2013, 02:34 PM

Originally Posted by Graeme

X2, with the amber light being due to the reservoir pressure
not rising quickly enough after the vehicle has attained the target height then the red light due to not being able to raise the vehicle quickly enough to attain the current target height.

Thanks Greame - this is what I have been informed by my local mechanic too.

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