A

Armyair

New Member

• May 26, 2012

• #1

Hi
I've noticed when parked for a week and not lowered the rear air suspension gradually drops onto its bumpstops over 2-3 days and the front stays as left.

When testing with my fault ate a reoccurring fault code is pressure switch on.

On initial look the rear air shocks look almost brand new so are probably not the culprit.

I assume the pressure switch block splits the pressure into 2 sub systems front and rear so I'm looking at a leak in the rear system. Also the pump although it cuts out seems to run a large proportion of the time.

Has anyone got any fault finding tips or ideas? All help is gratefully received.

 

Stufer

Well-Known Member

Full Member

• May 27, 2012

• #2

Dunno about the fault code, but did you check rear pipe connection at the collet on the bags. They can be a sod to push in properly following a bag change. Soapy water spray test easy to do.

Stu

 

A

Armyair

New Member

• May 27, 2012

• #3

Ok thats a thought. Thanks. Could another EAS fault which I thought unrelated be affecting the rear air sus. Every now and then the EAS warning light goes off and I reset it. The fault is either front left height sensor out of limits or rear right height sensor out of limits on my faultmate.

I've assumed up until now that it was unrelated and just another job to be tackled on my list but something I've just read by Wammers in an older thread has made me question this.

On my return to my house and awaiting P38 next week I shall leak check both rear airbags and then follow any subsequent advice as its offered.

After removing the dash to change the heater o-rings nothing seems to much hassle now lol.

 

Saint.V8

Dyed-in-the-wool 100% RR Junkie

Full Member

• May 27, 2012

• #4

Armyair said:

Hi
I've noticed when parked for a week and not lowered the rear air suspension gradually drops onto its bumpstops over 2-3 days and the front stays as left.

When testing with my fault ate a reoccurring fault code is pressure switch on.

On initial look the rear air shocks look almost brand new so are probably not the culprit.

I assume the pressure switch block splits the pressure into 2 sub systems front and rear so I'm looking at a leak in the rear system. Also the pump although it cuts out seems to run a large proportion of the time.

Has anyone got any fault finding tips or ideas? All help is gratefully received.

Click to expand...

The EAS Valve Block uses seperate valves and galleries for each corner....it isn't split Front/Rear it is split to all for corners, each on independantly controlled....

If just the rears are lowering, I would think it is Airbag on the rear related....not valve block, but if the block hasn't been resealed, it wouldn't hurt to do so....

If the pump is running alot this indicates a leak somewhere, time to get the soapy water out and go over everything....

Also do the 'Wammers Compressor Check' in the How To section to make sure your compressor is actually makeing pressure too....

 

Stufer

Well-Known Member

Full Member

• May 27, 2012

• #5

Seems odd that front stays up. If rear end leaks somewhere it should self level every 6 hrs provided all doors are shut, then end up on the bump stops

Stu

 

dogsbody

Very senior member

• May 27, 2012

• #6

Are you parking on a level surface? It's not the self levelling causing this? Try parking the other way round. If it still does it then out with the soapy water etc.

Mind you between your fault of 'pressure switch on' which indicates low pressure in the supply side and you saying that the pump runs for a long time then I think that you've got a leak.

 

Datatek

Well-Known Member

• May 27, 2012

• #7

If your Faultmate is saying you have 2 height sensors reading out of limits then surely that has got to be the place to start?
If the ECU gets a duff sensor reading when it goes through it's self leveling routine it may well drop the suspension to try to bring the reading into range.
Never ignore the obvious, if you have a recorded fault don't just clear it, FIX it!
Pressure switch constantly on is often due to lack of air pressure.

 

A

Armyair

New Member

• May 27, 2012

• #8

Thanks all for the advice.

With regards to the sensors it was next on my list of jobs however I'm not convinced it is both sensors as they are at opposite corners and I think the one corner(rear) occasionally sitting lower and the reading being out of the pack so to speak on the faultmate is convincing me that this sensor is causing a false rear right ride height and effecting the opposite corner.

With regards the pressure from the compressor maybe I've missed a leak as I replaced the compressor for a new one immediately after purchase as the original was noisy.

With regards self levelling and leaks your ideas are leading me to believe a leak from the connection to compressor and my rear sensor setting the self levelling off. Fingers crossed and thanks again.

 

A

Armyair

New Member

• May 27, 2012

• #9

Oh I forgot to explain the lazy reset of the sensor fault. I'm a soldier living away from my better half, my p38 and tools during the week and having been waiting for some leave to tackle it.

As I've recently discovered a rear hub seal leak on the same corner lol I thought I'd tackle both together and save on the labour time and ear ache from the missus.

Who would believe it was her motor solely for towing her horse box and I get ear ache for keeping it on the road for her. Lol