The vote of confidence is definitely appreciated, but, alas, 5 mins from work this morning, CATS System Fault appeared...

 

My drive to get lunch met me with a Jag that was sitting LOW and the Air Sus Fault and the CATS Sys Fault flashing back and forth. I got back to work, disconnected the battery and will reconnect when it's time to go home at 5 PM EST. It was about 3PM when I did that, so maybe, JUST maybe, there will be something better...

 

Jason,

Just to make sure. Do you have the SDD software running already and something like a Mongoose adapter to connect it to the car?

Guus

 

I have the Mongoose adaptor and the SDD software in my laptop at home. I intend to connect it this evening when I get home. If you could describe how j get the proper codes, is be eternally grateful! If you want to phone me and walk me through it, I'm all ears! If that is something you're willing to undertake, please PM me and I'll send my mobile number. I'm in Virginia, BTW.

 

First make sure Windows recognizes the Mongoose. You see a message in the lower right corner indicating the Mongoose is connected when you insert it into USB. If not, you have to check two things. Make sure you installed the Mongoose driver (it should be in the XP start menu) or otherwise you haven't installed the driver and have to do so from the DVD. If it is installed start the Mongoose software from the Windows Start menu and choose to update the Mongoose to the Pro version. If everything is correct you should see a message every time you connect or disconnect the Mangoose. It's important this is functioning or the rest won't work!

Now start up the SDD software and enter you VIN manually. You can do this without car. The software will want to connect to the internet to get information regarding your car. Just ignore. It will show you a picture of you model XJ and ask you to confirm. Click okay and start a diagnose session. You should see that the Mangoose is connected in the lower right corner. If it's not or says VMM go into settings and find where you can change the VMM for Mangoose. This should all work correct otherwise it's no use connecting it to the car!

If all of this works you can take the laptop to the car, connect the Mangoose and in the diagnose session choose the option to read fault codes from the car. Follow the instructions on screen and it should do so.

It should switch to a screen where you can choose the symptoms. In your case you could select anything CATS or suspension related. Acknowledge and see if there are any matching DTC codes. If not choose unrelated DTC codes at the top of the screen to see the rest of the codes. At this point just write down the codes and post them here.

I've probably forgotten some steps but this is generally how to get started with SDD and read codes. Hope this helped. No phone support I'm afraid, going to bed now!

Guus

 

I have had it connected successfully on several occasions. When I attempt to locate the codes, that seems to be where the breakdown is. There are no codes being shown. I have been able to manipulate the air suspension with the software by leveling and doing all of the measurements probably a dozen times so far. I cannot find the cats system anywhere within the software. The air suspension is the closest I could find that has anything to do with it. I connected the battery after work. And it feels like I am in a boat skipping across waves. The cats system fault has come back on almost immediately but the airsuspension fault has yet to appear, but I am guessing it is only a matter of time as it is writing so rough.

 

Any ideas from this? How do I get into the info? Nothing is "clickable"...

 

Suspension DTC report...

 

Jason, that is the correct screen but look under unrelated events what dtc codes you have. The software is supposed to match the symptoms you entered with the dtc codes but often it doesn't. Simply write down the codes you see in unrelated and post them here.

Guus

 

Jason,

I found this Instruction Manual for JLR SDD online and was able to download it and save it on my computer:

http://www.mediafire.com/download/x6...l+02_02_12.pdf

I'll post this in a new thread as well.

Cheers,

Don

 

Got her sardined into the garage while in Indiana. DLed the manual for some reading and better understanding when I get back..

 

2004 XJR with 42,000 miles.
New shocks front and back. Compressor seems to work to good.
Appears to be over pressurizing making the suspension very stiff, bouncy.
This problem is intermittent and appears to be the rear more than the front.
Is there a relief valve, pressure sensor, relay that could cause this?
Any help is appreciated.
Thank you,
Lynn Beagles
817-371-000

 

Lynn,

It might be better to open you own topic to get more answers.

My guess is your suspension switches to stiff through the CATS system. That is done on the dampers and is a separate system from the air suspension itself. To be sure you need to get the fault codes read.

Guus

 

Welcome and Yes, it is in this thread.
Are there error messages displayed in the dashboard ?
See the posts of 34by151 and Don B.
Check the fuses and relays first.
If you have access to an JLR SDD, please read the posts of Xag.

Cheers

 

we got home late last night from Indiana. Took the Jag out for a few minutes today and the air suspension leveled out the car right away.that was when I took her out of the garage. I went for a little ride and within few minutes the cats system fault appeared and she started riding rough and then it disappeared again and my aggravation level was already through the roof so I thought it best just to come home for now. On the bright side, I finally got the K&N air filter in!

 

So the test drive after I got home from Indiana had no issues, other than the CATS. Well, I installed the K&N Air filter when I got home. Left for work this evening and the Check Engine light came on. I made no other changes and have to assume that it's the K&N. Anyone have any similar experiences? I put one in my other 04 XJ8 and this didn't happen so I didn't feel this would have any affect either...

 

Hi Jason,

The first thing that comes to mind is if the new K&N had too much oil applied, the MAFS could have been fouled.... Let us know when you get a chance to read the DTC(s).

Cheers,

Don

 

I'm not really into these filters but if you need help on the SDD just ask!

Guus

 

I connected the SDD and it read that the sensor was not reporting properly. I opened the hood and the black/green wire was out of the sensor. I firmly reinserted it and the Check Engine light went out. The CATS system Fault is still there tho. GRRR!!! I inflated the front & rear axle and the reservoir as well. I could hear the air being released slowly from the system as I stopped, started, and turned, but the air just didn't return..

 

Jason,

And you didn't see any codes on the CATS?

Guus