Need some diagnosis advice from you X350 air suspension gurus...

My '07 XJR is once again displaying "Air Suspension Fault" and a yellow light

As all four struts were "rebuilt" by RMT just 2,000 miles ago (and the compressor revamped with new ring, etc), I am a bit disappointed. Especially as the RF strut (which began leaking in Wyoming just a few days after all four "rebuilt" struts were installed) was replaced 1,000 miles ago. And no, I am not a fan of RMT...

Last time(s), the problem(s) were fairly self evident. Rear end wouldn't lift (the RR strut was leaking). Then, in the middle of WY, the front end wouldn't lift (the RF RMT strut was leaking)

Now, the car isn't fatally sinking, but the front end seems low, and the yellow light comes on within 3 miles of driving. My scanner show the RR height to be consistently 20 mm higher than the FR (eg, 6 vs 26, but when I measure (wheel ctr to fender lip), the results are ~ 16" vs 16 1/2". The fronts seem to be 15 1/4" - 15 1/2" (and show ~ 6 on the scanner)

I suspected the compressor, yet the scanner shows everything from 0 bar to 16.4 bar. And, if this matters, the pressure sensor supply voltage seems to vary between 1.6V and 9.8 V

Thinking another leaking strut, I electrically unplugged the (trunk) valve body and left it overnight. No change in ride height. Also, this car has sat in the garage for the last 3 months while I have been travelling and hasn't settled

Compressor?
I don't have the ability (with my Foxwell 510 scanner) to command the compressor and time the pressure rise. But, the compressor doesn't seem to run unless the car is driven, and then only seems to cycle very infrequently. With leaking struts, it would come on shortly after the car was started, and seemed to run alot while driving (as indicated by the scanner)

Any tips would be appreciated

 

Can you please check the fault code again? C3202 isn't a valid listing for the XJ.

 

I think its a typo. C2303 I reckon, (reservoir plausibility error) - usually the compressor or a leak.

 

C2302 Levelling plausibility error

C2303 resevoir plausibility error

Page 270 http://www.cmsinetwork.me/jag/X350%2...%20Chassis.pdf

I suggest you check or replace the compressor relay and fuse.

Could be a wiring fault also.

jaghelp.com: Super XJ air suspension C2302: an odd leak

SOLVED: Have a 2004Jaguar XJ8 with message air suspension - Fixya He has the codes the wrong way around

 

C2302 "Leveling plausibilty error"

(Sorry for transposing in the original post). Appreciate the tips

I tried swapping the air compressor fuse and relay as suggested- no joy. I cleaned all the grounds, etc when I reringed the compressor 2K miles ago

I've left the Jag for 3 days (with res valve body electrically unplugged), and it doesn't sag (though I think the front is a bit low now always).

Funny, the compressor doesn't seem to come on at all unless the vehicle is moving, and only rarely then (watching a live date scanner as I drive)

Also, oddly, the right rear sensor number is consistently ~ 20 mm higher than the left rear (measuring with a tape, it is ~ 1/2" higher). I have checked mounting of all 3 height sensors

Driving, it will run maybe 3 - 5 miles before the yellow light "air suspension fault" comes on, and i can then feel the front end get stiffer

Believe I will manually empty the air res, then manually run the compressor for 2 minutes (with an external battery), and see if it pumps up to 12? bar (on scanner) in that time. Not sure how else to test it. Appreciate any ideas

Funny, I've now sunk a ton of money in this car, thinking it would be trouble free for the next 50K miles or so. Not...

 

This has worked in the past:

Break air pipework and depressurise system completely.

Make good pipework and disconnect battery.

Touch battery leads together for a couple of mins after disconnecting from battery.

Replace battery leads.

Run engine and drive car for up to 20 mins if necessary.

 

Plausibility errors happen when it attempted to either compress or decompress the modules to no avail. It then tells itself, I see no change in my height sensors and no matter what I try, this isn't real.

C2302 generally is a mechanical issue, like a broken or pinched tube or a clogged fitting, or no air. To kick off the compressor when parked, the engine will have had to have run for more than 2 minutes, and there would have to be a change in the height sensors from it's calibrated position, like a low reading over a prescribed period of time.

 

This is my first winter with my 2008 xj8. As soon as the temperature hit 25 degrees i started getting suspension errors. Front end is dropping but compressors kicks in and raises up. seem to do ok until the temperature dropped to 14 degrees. Car dropped in front end during day while parked at work. Got low vehicle and had to limp home. next day temp up to 25 degrees and ran fine. Traded my 2004 for this 2008. Had constant air suspension errors exacerbated by cold temperatures. rebuilt compressor with new piston ring and that seemed to solve it. I have already ordered a new rebuild kit for this car. Would like to hear from anyone who can confirm cold temperature issues.

thanks,

Steve

 

Spec calls whenever an air line is disconnected to cut approximately 3/8" off the end of the air line with special cutting tool to ensure an even square cut and install a new nut and olive.

Your not supposed to reuse the olive as the new olive grips into the air line. That's what ensures a good seal and holds the air line in place when under pressure, especially on the compressor.

So, based on the work you had done that would be 5 new nuts/olives.

Was the above done? If you re-connected the air line(s) without the above being done this may be your problem.

PS - I have spare olives and nuts for the air suspension lines. No longer need them as my XJR has the air strut conversion.

 

Taylormobile / Steve;
The symptoms you are reporting are fairly common. Search the forum. In my case a year ago ( 04 xjr, 80 kmi ) below ~60F I started having issues. Higher temp.... problem gone. At low temps I could hear air escaping past the top seal of one of the front airsprings. Replacement by OEM Bilstein B4's immediately resolved the problem. About a year after I had compressor issues. The rebuild kit unfortunately didn't fix the problem. I got a reasonably inexpensive OEM Wabco from overseas and it immediately resolved the issue.

+1 on replacing the olives and trimming the end of the airline.

Also a plug for BagPipe Andy's rebuild kit. He was incredibly patient and helpful with his compressor rebuild kit and he has a lot of the fitting available for purchase. You can expect competent e-mail support from him!! I recall elsewhere on the forum someone observing sometimes the rebuild kit works, sometime the compressor is just too far gone to repair.

Best Regards, William