Thread: Bizarre cause of air suspension failure...

Well, I work for a dealer and they do all the time. That's what we diagnose them as and that's what it says on the warranty report.

Just trying to give you the information as it is.

Hi Folks,

It may well be that the old compressor has cried enough and died. As soon as I get a chance to check out the old unit, I'll let you know.

That said, the real reason for my post was to highlight the seemingly freakish nature of the hose being damaged...

Cheers,

Andrew Matusiewicz
2005 Discovery 3 HSE V8

Yeah, at least you sorted out the issue, let us know what happened if you can.

Sounds like a supplementary pressure switch, wired into a 555 timer, on the line to the reservoir from the compressor (after any check valve between the two) needs to be fitted to switch the compressor of if it's run for X amount of time without achieving a pre determined rise in pressure in a pre determined amount of time.

But knowing modern designers its probably all internal. But could it be done with a replacement compressor? What pressures are needed for the system to run/lift the car?

This is applicable to the L322. Would suggest D3/D4 would be similar:

Compressor Disabled
Operation of the compressor is prevented by the ECU in the following conditions:

1. Temperature sensor on compressor indicates compressor is overheated. The ECU will allow the compressor to be run up to 110 degrees C for height adjustments but only up to 100 degrees C for reservoir filling.

2. System pressure sensor indicates pressure exceeds 13.7 bar (200 psi).

3. Timeouts: The ECU will only allow the compressor to run continuously for a maximum of 3 minutes regardless of temperature or pressure. If it is attempting to fill the reservoir it remains off for 3 minutes before resuming, but if it is just regulating system pressure it only takes a 20 second break.

So if we had:

• A compressor that could push just over 200psi (probably look at 250).
• An external, maybe larger reservoir for less cycling.
• Temp controlled running so it will run within pre-determined limits of temp of compressor.
• Time controlled running based on a known value of x min to fill empty reservoir and current volume of reservoir. To establish with other inputs is pressure loss has occurred and where.

It would be good?

Yeah, if you wanted to do it yourself, sounds expensive though, Land Rover would meet do it.

Development of chip programming, 1 slab, reservoir 2 slabs, compressor couple hundred.

Land Rover would meet do it.

WTFBBQ?