P38A Another eas question

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Wazzajnr

Wazzajnr

Well-Known Member
Posts
2,391
Location
Chorley
Hi all,
Hope you're all well?
Asking on behalf of someone who I'm trying to help with an eas problem.
Basically, everything's been changed over the last year or so and it's basically working OK when driving but as soon as the engine is switched off, the target heights go really high and it lifts up high. At this point, according to nanocom, it's in levelling mode.
Also, when you turn on the ignition, it again goes into "levelling mode" with sky high target heights until the engine is running. It then seems to settle down to the correct height.
When stopping at lights, it seems to level OK.
It's just when it parks up, it's like it's on stilts.
Any ideas??
Cheers.
 
Yep, all checked and cleaned.
I guess what I'm asking for is, is it normal for the target heights to change to higher values when it goes into levelling mode at engine off.
If anyone with nanocom could do a quick data log from engine running until the eas goes into "dormant" mode, that way I can do a compare and see if anything is different.
I'm not entirely convinced that it is wrong electrically, it could be that something is leaking mechanically in the valve block and allowing air to get from the tank to the bags when switched off.
Cheers for the replies so far.
 
It almost sounds like the solenoid's on the valve block are mixed up and it is letting pressure in when it should be letting out but surely that would play havoc when running normally?
 
Wazzajnr said:
Yep, all checked and cleaned.
I guess what I'm asking for is, is it normal for the target heights to change to higher values when it goes into levelling mode at engine off.
If anyone with nanocom could do a quick data log from engine running until the eas goes into "dormant" mode, that way I can do a compare and see if anything is different.
I'm not entirely convinced that it is wrong electrically, it could be that something is leaking mechanically in the valve block and allowing air to get from the tank to the bags when switched off.
Cheers for the replies so far.
Click to expand...
It is not normal for the heights to go up when the engine is not running, self levelling with ignition off is down only.
For leaks in the valve block to cause all for corners to rise is pretty unlikely as it would require 4 valves to leak by the same amount.
I'm sure you will find it's an electrical fault, Check the EAS earthing points on the inner wing close to the EAS box.
I suspect the problem may be the height control button, press the inhibit button when running and see what happens when you switch off. You can also try the EAS relay under the passenger seat, if that doesn't operate correctly, it will cause problems.
 
Datatek said:
It is not normal for the heights to go up when the engine is not running, self levelling with ignition off is down only.
For leaks in the valve block to cause all for corners to rise is pretty unlikely as it would require 4 valves to leak by the same amount.
I'm sure you will find it's an electrical fault, Check the EAS earthing points on the inner wing close to the EAS box.
I suspect the problem may be the height control button, press the inhibit button when running and see what happens when you switch off. You can also try the EAS relay under the passenger seat, if that doesn't operate correctly, it will cause problems.
Click to expand...
My thinking was that if the corner valves are open for levelling and for some reason the valve to tank is passing then it will go up rather than down.
Am I correct in my thinking there?
Pretty much everything has been replaced (some things more than once!)
 
The only possible way the suspension can go up as ignition is switched off, is if when any particular corner valve is opened to exhaust air to level downwards, the inlet valve is being opened instead of the exhaust valve. If this is the case then obviously when the system wakes to self level the suspension will go up not down until stored air is expended to equilibrium with bag pressure. If the suspension rises after the car has been stood a while within the six hour self levelling period, you have a leaking inlet valve which is filling the inlet/outlet gallery with high pressure air. Because the exhaust valve is shut air in the galley pressurises and eventually air is forced past the corner valves into the bags.
 
@Wazzajnr - does this happen immediately, every time?

If so then it should be fairly straightforward to replicate the problem and see if the issue occurs via command from the EAS ECU (and in turn whether there's any particular input to the EAS ECU that's causing that command to occur), or if it's some odd mechanical problem.

This requires nothing more than a multimeter or trace light on the various lines to/from the EAS ECU. Hopefully the issue should become apparent once you've probed these lines. Happy to provide more detail or some sort of procedure if you need but there is a fair bit of data already around on the EAS...

Cheers, PU.
 
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