If I change out the air ride on my 04 X350 for coilovers, how do I program out the computer faults? (IE low air press, etc)

Eddie

 

its in the kit

 

Do you know how it is done?

 

Has anyone ever used an aftermarket air ride suspension controller?

 

are you talking about Motorcars kit? resistors to give the air suspension values its looking for.
you talking Air Ride the company? depends on what you want to do. if you want to raise and lower you could lie to the factory one with the correct voltages. And then scab in a air ride controller, go to larger lines ARB's new duel compressor 100% duty cycle and programmable controller.....

 

Nice to know how it's done, because the prices for these things are very high. I suppose if one calculates it as cents (or pence) per mile travelled, it is really pretty low, whatever !!

I looked on the internet, and found that a UK supplier has the front units at £640 each, but no rears. I hate to think what these are at Jaguar prices.

Land Rover owners are already well familiar with swapping out the air springs for steel.

 

I am pondering the swap because of the air susp fault I am currently troubleshooting.

Here is what I have done so far:

1. Power to and operation of compressor seems normal.

2. System goes up and down although slowly

While troubleshooting today, I was checking the tank for press, I had none, I had previously totally dumped the system to see if it would pump back up. I noticed that no air would come from the solenoid block with the tank line disconnected. IE the path from the comp to the empty tank was not opening. Should store around 200 PSI.

I think I will now remove the solenoid block and bench test it to see if it is working properly.

Any ideas are welcome.



Eddie 2004 VDP

 

Are you aware that in most circumstances the compressor won't run unless the car is travelling at over 25mp/h? If there is insufficient pressure in the reservoir until then, it will just inhibit leveling.

Could you put a balloon over the tank line and go for a drive to see if it blows it up?

 

The compressor was running as it should with low tank press and a low vehicle warning.

 

Yup, that is one situation when it should run. Just thought I would check in case you assumed it was broken when it wasn't.

 

Thanks but the pump was the first thing I checked out. The next suspect is the ASM. Are they pricey. What would a dealership typically charge for pulling the codes?

 

If I replace the air with coilovers I cound recoup a large portion of the cost by selling the old system.

4 Dampners
1 Compressor
1 ASM
1Solenoid Block
1 Air Tank.

 

MK82,

Careful not to over think this problem. Most air suspension problems are the rt. front shock or the compressor or both. Given that you will have 1 hell of a time selling left over air suspension components, a conversion is not always the way to go.

You can get rebuilt shocks and new compressors at a good discount from Arnott. Doing the work yourself is not that big a deal. Or you can locate a good experienced indie serv shop and still be big money ahead. Slow down. The simplest most direct solution is usually the correct choice. Your location is not posted but I'm sure the Forum members can point you in the direction of a competent shop near you if that's the way you choose.

 

You do not get rid of the air suspension module on the conversion. It performs other functions on the car and has to stay in the network loop.
How are you checking pressure? Just because the pump is running does not meen its good. I have many pumps that run and cant fill the tank over 5 bar. No where close to system full pressure

 

I want to install a pressure gauge in the holding tank. I need a tee with 4mm quick connnect on each end and a 1/8 or 1/4 NPT tee. Or I could drill and tap the tank itself. The compressor appears to run strong but I need the gauge to test it right. I will also make a pinout box to test the solenoids.

Haven't found any leaks. Any one have a source for the air line fittings that goes on the air bags, solenoid block, etc. I think they are called Voss fittings.

I live in West Palm Beach area. Local Jag dealer wants $135 to diagnose which they will apply to any repair.

Who makes a scanner that will read Jag Chassis codes?

 

Today I installed a pressure gauge in the storage tank. I bled the system down and jumped the compressor and the solenoid to the tank. it pumped up to 175 which is the limit of the gauge in about two minutes. Seems fine to me. Yet I am still getting the air suspension fault. I think I will take it to the dealer and let them try to troubleshoot it for $135. I need the code or codes that are triggering the AIR SUSPENSION FAULT msg in order to go any farther. I also have been unable to detect any leaks either.

Does anyone know the factory suspension heights and how and where they are measured?

Edit: I found the ride heights.

 

MK 82, I have the AutoEnginuity PC based ST-06 OBD reader with Jaguar specific SW I can lend you. It has the CD-ROM with AutoEnginuity Jaguar Specific module, OBD connecter and USB cable. PM me with your address. Just send if back in a few weeks or a month and reimburse my postage. You'll need a laptop that runs XP or anything that handles USB 2.0
Bob

 

That is extremely generous of you PM on the way. My laptop runs windows 7.

Eddie

 

I used the scanner that Bob lent men today to pull the codes. All I got was the usual C1800 Plausibility error. When the car starts up the compressor runs but the solenoid to the tank does not open allowing the air in. If i jump the solenoid to the tank it will fill normally. This is controlled by the Air Suspension Module. As is the compressor and the rest of the system. No codes specific to it however. The mystery continues. The left rear bag will not pump up to the specified ride height. I will remove it tomorrow and check for leaks.

Eddie

 

Well I am getting somewhere. I took off the rear shocks and the left rear is leaking badly. I will probably replace them in pairs. The rebuilts don't come with the accordion dust covers. Do you techs think they should be replaced? The r/r is OK but the l/r is badly torn.

I am making progress.

Eddie