EAS fault - pressure constantly high

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roccotune

New Member
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428
Hi chaps,

P38 diesel:-

Can anyone suggest what's at fault, every month-2 months the EAS fault happens and the diagnostic says 22 pressure constantly high

A reset keeps things good for a while, and even when the fault is on it holds height.

Tried a search but it's not much good from the app.

Cheers all
 
roccotune said:
Hi chaps,

P38 diesel:-

Can anyone suggest what's at fault, every month-2 months the EAS fault happens and the diagnostic says 22 pressure constantly high

A reset keeps things good for a while, and even when the fault is on it holds height.

Tried a search but it's not much good from the app.

Cheers all
Click to expand...

Check operation of pressure switch first off. But this has been associated with failing driver pack causing a spurious signal. Recent thread on it.
 
Doesn't "pressure constantly high" usually mean the switch not closing within the ECU expected time limit ? Probably pump starting to wear, and gonna need piston seal soon.

Removing the valve block exhaust silencer makes it easy to hear the pump switch off while driving !!
 
wammers said:
Check operation of pressure switch first off. But this has been associated with failing driver pack causing a spurious signal. Recent thread on it.
Click to expand...


Ok I will get the multi meter out and see what reading I get, hopefully it's a simple as that?!
 
pwood999 said:
Doesn't "pressure constantly high" usually mean the switch not closing within the ECU expected time limit ? Probably pump starting to wear, and gonna need piston seal soon.



Removing the valve block exhaust silencer makes it easy to hear the pump switch off while driving !!
Click to expand...


Interesting, may replace anyway but not noticed the pump staying on particularly long, worth a look however
 
As Wammers said this has been cured by replacing the driver pack. There was no logical reason for this until Data found a failed smoothing cap in a pack. Still no 'proof' but it's the only known cure so far,
 
roccotune said:
Hi chaps,

P38 diesel:-

Can anyone suggest what's at fault, every month-2 months the EAS fault happens and the diagnostic says 22 pressure constantly high

A reset keeps things good for a while, and even when the fault is on it holds height.

Tried a search but it's not much good from the app.

Cheers all
Click to expand...
If you put in your location someone may have a spare driver pack you could try.:)
 
There's a reason why Driver Pack can cause this error, but it still could be the compressor. It's all in the LR EAS System Info document.

The "pressure constantly high" fault essentially means the air switch is open circuit, which is probably because max pressure has not been reached. Hence can be caused by compressor getting tired.

BUT . . according to EAS SID, "Compressor failure may be confused with inlet valve stuck closed, exhaust valve stuck open.". This is why failing driver pack can also cause odd pressure errors, because the valve block is unable to send air to the right places in a timely manner.

The "Inlet suck closed" can be caused either by intermittent driver pack not opening the valve, or as I found out, bad connections in connector feeding the driver pack. This causes dodgy inputs to the driver pack, hence looks like pack failure.

Remember EAS ECU does tolerate some of these issues for a while, but if filling air bags takes too long, then you get the fault.
 
pwood999 said:
There's a reason why Driver Pack can cause this error, but it still could be the compressor. It's all in the LR EAS System Info document.

The "pressure constantly high" fault essentially means the air switch is open circuit, which is probably because max pressure has not been reached. Hence can be caused by compressor getting tired.

BUT . . according to EAS SID, "Compressor failure may be confused with inlet valve stuck closed, exhaust valve stuck open.". This is why failing driver pack can also cause odd pressure errors, because the valve block is unable to send air to the right places in a timely manner.

The "Inlet suck closed" can be caused either by intermittent driver pack not opening the valve, or as I found out, bad connections in connector feeding the driver pack. This causes dodgy inputs to the driver pack, hence looks like pack failure.

Remember EAS ECU does tolerate some of these issues for a while, but if filling air bags takes too long, then you get the fault.
Click to expand...

All correct, there can be various reasons for fault codes. Interpreting them is the tricky bit. :);)
 
Makes me laugh when the EAS SID says this error could be X or Y, or maybe Z. I guess combo faults are to much for the simple 1980's ECU to figure out !!

P.
 
pwood999 said:
Makes me laugh when the EAS SID says this error could be X or Y, or maybe Z. I guess combo faults are to much for the simple 1980's ECU to figure out !!

P.
Click to expand...
A 1980's ECU is quite capable of dealing with any number of fault conditions if the manufacturer is prepared to put the necessary sensors & feedback in.
LR want minimum cost, not maximum fault reporting.
 
pwood999 said:
Makes me laugh when the EAS SID says this error could be X or Y, or maybe Z. I guess combo faults are to much for the simple 1980's ECU to figure out !!

P.
Click to expand...

That is why when dealing with EAS you need to follow a logical path to eliminate things. You can spend a lot of pennies if you don't, trying to correct with parts what maybe a simple bad contact. Bet there are a lot of people who have splashed out on a driver pack to cure a fault, when the simple act of plugging the new one in with tighter contacts actually did the job. £160.00 odd for a few tighter contacts is a lot of money. :);)
 
Tried cleaning the contacts today and reset the fault. Didn't have time to read value of pressure switch but as soon as the fault was cleared the car jumped up to normal night no problems - at least I am lucky enough that it's not a big problem a yet ;)
 
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