Hello Guys,

So every time I drive the car I get yellow triangle popping up on the screen with message "suspension fault". Error codes are as follows: U0421-81 State: Intermittent, "Invalid data received from ride level control module", C1A20-64 State: Intermittent "Pressure increases too slow when filling reservoir", C1131-92 State: permanent, "Air Supply". I have noticed that rear right side sits lower than the left side. I also have "vehicle too low" yellow warning when on idle and as soon as I start driving red triangle pops up with same message. I know it could be many things, but is there anywhere I can start? I don't want to buy new compressor in case it isn't that. Any help will be much appreciated.

 

Can you fill us in on what car your talking about? Maybe the mileage and what you have done already?
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I think you have a leak somewhere if you have an air supply fault, but post your vehicle model as well.
Some good info in this thread: https://www.jaguarforums.com/forum/x...-268197/page2/

 

Sorry guys, the car is Jaguar XJ 5.0 Supersport 2012 with 78k miles on it. Since I own it from March 24 I have done timing chains/tensioners/ guides. From day 1 I had suspension fault coming up but not so often. Now it's every time I drive it, however before didn't see the difference in height between left and right side. I can see and hear the compressor running.

 

You have an leak somewhere and compressor cant keep up. Fix it before your compressor burn and fail.
You can use soap water by spray bottle to find the leak.

 

I don't think I have a leak, as system stays on the same level over night. Today I had compressor out and stripped it apart and everything looks ok. I have loosen top air hose connection on the valve manifold which said LR and LHS side went down and when I started the car and went for drive nothing has happened - car stayed as low as it was before. So it looks like its not lifting up. What is the black plastic housing next to reservoir? Is it a filter? Any advice? this issue really annoys me. Anything to check like relays, etc?

 

It's not keeping air, so you are getting C1131-92 State: permanent, "Air Supply". That can also happen if you disconnect the system and don't clear the codes, but normally that pops up.
Next step would be to soap bubble the fittings and reference the air supply diagram in the sticky at the top of the forum. If you indeed have no leaks in any parts of the system, then i'd clear the codes and try to recalibrate. But the C1131 doesn't come on unless there is a system disconnect or a leak.

 

Chrisp,

Have you got any other codes for other systems on the car?

The reason I ask, is because the compressor will only run when the car is above 30 kph (18 mph). If it's not getting a command signal, it won't run, so a frayed wire might be the issue...or a failed speed sensor.

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Just a tip for others.

You can test the integrity of the system quite easily.

With the engine OFF, open the boot/trunk and sit on the boot lip. After 20-30 secs you should feel your bum rise as the system compensates for your weight.

wombat

 

Hello, my compressor kicks in few seconds after I start my car and runs for few seconds and stops. I cannot get the suspension to raise. Can I put 12v directly to the compressor and run it for a while and see if suspension raises? I did leak checking and all connections seem to be leak free. Is it worth checking all the fuses related to suspension and the compressor relay? Just running out of ideas...

 

I recommend to download x351 Service and Repair manual from sticky section. Its big so it will take awhile, but exsample air suspension system and operating principals of it are extremely well descripted on the manual. It sounds like you have binding valve body, issues on controlling it, or block line.
The manual have exellent troubleshooting. (Its far too much to write all here, when its well documented on that exellent pdf)

 

If you have a scanner available to you, with bidirectional controls you can also try and actuate the showroom height mode. Unfortunately I'm not aware of how to do this without a scanner or SDD. This could tell you if you do have debris or a blockage preventing air up. The rear shocks are the only ones that raise, the front have traditional springs that are measured and used to compensate rear ride height. So if you aren't leaking at the air spring, I would think you have a blockage or leak upstream and the manual will show you each component to check. Sorry that this is happening to you.

 

Hello mate, I'm trying to download any link from Sticky section, but after clicking any link the blank page appears and nothing happens. I have registered with media fire, but that didn't make any difference. Any thoughts?

 

Hi chrisp1981,

One very common contributor to symptoms like yours is a worn piston ring seal and/or a scored bore in the air compressor. If the compressor cannot fully pressurize the system within the time alloted by the Air Suspension Control Module (ASM), various diagnostic trouble codes (DTCs) are triggered and the system is disabled.

Check with our member bagpipingandy (bagpipingandy.com), who manufactures compressor repair kits that include a new Teflon piston ring and, if you choose, a new cylinder head. Andy lists his kits for sale on ebay under the seller name Kirbie Engineering Solutions, but send him a PM first to confirm that he has a kit that will fit your compressor.

While repairing the compressor, take the time to clean any rust from the leave valves, exhaust valve and high pressure relief valve, and put the molecular sieve desiccant beads on a cookie sheet and bake them overnight in an oven set to its highest temperature (e.g. 500°F) to partially reactivate the desiccant.

Cheers,

Don

 

Wait with patience on white screen. The document is quite large and it take some time before your browser get it thru and start download.

 

Quick update on my problem. Visited diagnostic shop and been suggested to replace the compressor. I purchased compressor for BMW X5, which looked almost identical and saved a fortune as new cost £130. Had to cut out a bit of plastic bracket as exhaust valve is on the other side on that pump. Reset all trouble codes, started the car and all problems have gone away!!! No error messages on the dash (for how long?) Thanks to everyone who contributed, all guys are all very friendly and helpful.

 

Good repair!
Any chance you can post a part number? Maybe help the next guy?
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