Disco 2 D2 air suspension

Guys,

A funny one here.. mates D2 air suspension was dead and been on its arse for a while and wouldn’t pump back up, I’ve had a look at the guide on here but still scratching my head. It’s took a few weeks loosing air before sitting on the bump stops!

When I looked both height ride sensors arms had broken on the bottom and the compressor wasn’t firing. Granted I’ve never had anything to do with air suspension and he’s not wanting to convert to springs I just thought it was possibly the sensors and compressor at fault (I could be wrong) any way he’s gone out and got a second hand compressor with a faulty valve so he’s changed that with the one that way on his car originally and replaced both ride height sensors but the compressor still isn’t firing!

He’s asked me to look and to be honest I have a few days to gain some information before diving in!

Could this be a valve fault?
What’s the best way to bench test the compressor and valve ?
Does it need re calibrating?
Could it be a faulty ECU ?

Any help is appreciated!

Thanks

If it's on the bump stops it often "goes to sleep". Try jacking it up using the towbar so it's getting close to the normal ride height.

If the ride height sensors were changed while the battery was connected then they may need calibrating. Depending on where you live there may be a member nearby with a Nanocom, Lynx or Hawkeye.

iansoady said:

If it's on the bump stops it often "goes to sleep". Try jacking it up using the towbar so it's getting close to the normal ride height.

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I’ll give that a go for him anything is worth a try I suppose it won’t hurt anything!

brianconwy said:

If the ride height sensors were changed while the battery was connected then they may need calibrating. Depending on where you live there may be a member nearby with a Nanocom, Lynx or Hawkeye.

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I think it was connected but not 100% sure that was my thought it may need calibrating if all fails I’ll try and find a member over Sheffield way to plug it in for some cash!

Thanks guys

Have you checked the compressor relay?

Nig43 said:

Have you checked the compressor relay?

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Not yet buddy, where is it located ? I’ve never had anything to do with air suspension I’ve only ever had old D1s and a 110.

Its in the engine bay fuse box by the battery. I would assume its the one indicated by the icon showing the car rising and falling.

Also IIRC in normal operation mode the car needs to be travelling at 5MPH before it gets a signal to alter the air suspension. I assume this can be overiden with a diagnostic machine.

The easiest thing to try first is (as said above) jacking up the towbar with all doors firmly shut and then reach in through the drivers window and switch the ignition to position 2.

joshremlin said:

It’s took a few weeks loosing air before sitting on the bump stops!

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Then the compressor might be disabled by the ECU due to exceeded duty cycle so it need a reset with tester... in case the compressor didnt die getting tired to copmpenate the leak

Interceptorxj said:

Also IIRC in normal operation mode the car needs to be travelling at 5MPH before it gets a signal to alter the air suspension. I assume this can be overiden with a diagnostic machine.

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I don't know where you got that idea from. The air suspension will automatically self level when the vehicle is stationary, provided that:-

• All the doors are closed
  
• The ignition switch is in the II position (engine running)
  
• The SLABS ECU hasn't timed out.
  • This can occur when the compressor runs for a period longer than limits set by the ECU. It will time out to prevent further damage. It will require the use of a code reader to reset the ECU.
• The ride height is within the specified limits.
  • If the height registered by the ride height sensors is too low and outside the specified limits the ECU will not run the compressor. The body needs to be lifted so that the height registered by the sensors are within the limits, hence the jack under the tow bar.

Any speed consideration applies to the "Off-road" mode. When the speed of the vehicle exceeds about 18 kph the raised suspension will revert automatically to the normal running setting.

Sorry for the late reply guys. I always like to get a solution to my problem on as it gives others ideas of solutions.

It turned out to be the pump relay, the air bags was perished so we replaced those and my mate bought a Hawkeye and we calibrated the system ourself and it’s been bang on since