EAS compressor continuously running

[LRDan]

So a bit of a weird one, a few times now my EAS compressor has kept running when the car is turned off, and even locked.

Latest time it happened, I parked down the street, compressor kept running, so unplugged the big main loom (which has become my method of shutting it off in a hurry). Came back to car 10 mins later, plugged it back in and it wasn't running - all good so I left it plugged in. 5 mins down the road the car automatically goes into "extended" mode, but kept rising! The extended light started flashing as I'm guessing the car was trying to get back DOWN to "extended" Quickly pulled over and unplugged big loom.

Plugged nanocom in, and bags had 40psi more than "extended" mode in them :blink::blink::blink:

Now nothing I did with nanocom allowed me to get the air out, tried opening/closing valves, emptying rear, emptying front etc etc.. Nothing! It said operation completed but the car stayed at monster truck height.

Tried locking/unlocking car, turning it off (seeing if it would self level lower) nothing! Had to wait about 15mins, plugged compressor back in and she was all fine again. As soon as this happened it self levelled to "highway" mode which is what I had it set on before this all happened.




Unsure if related, but my main key remote stopped working quite a long time ago, and have been unlocking it in the door. Every now and then the alarm goes off, and have to disable it with the nanocom as car says "Engine Disabled press remote" which I cant do. There never seems to be settings in the Nanocom, even my EKA that I set. I have to set a new one before it will let me disable immobiliser.

Also twice in the last 6 months I've gone to use the car and the battery has been dead flat - like dead dead. I know dodgy batteries aren't great for the P38 but I can't afford to replace it at the moment - it seems fine at the moment and its less than a year old. Also noting it was in the location it is normally parked in so I don't think anything external is waking up the BECM


I've finally had some time to play today and the first thing I did was redo earth points. Took each one in the engine bay off, sanded clean and re attached. (All except the one under the scuttle plate below wiper motor).

I'm thinking the EAS delay turn off timer could be the culprit for the dead battery, so I'm unplugging it nightly until I get another one. Hasn't been dead flat since.

I have also swapped the compressor relay with another to see if that fixes the compressor running constantly.



Has anyone had anything like this happen before? I'm thinking next thing if the relay is fine is valve block driver..

Dan



PS. I managed to get the key to resync with the "hold lock button in the door" method.. Wish I had've done this ages ago! :wallbash:

[prelude]

The compressor running can almost certainly only be a sticking relay or a fault in the EAS computer. There is a pressure switch on the valve block that should cut out the compressor so the only reason for it to continue to run is when the signal does not reach the control unit or is otherwise broken.

The dead battery will probably be because of the running of the compressor I would reckon.

I would suspect the EAS computer if you can not open or close valves, strange rises occur and compressors run without need. Can you read current value's when the system goes haywire? ie, ride height sensors etc. are displaying realtime values? That would suggest that the computer is in itself at least communicating and reading value's.

-P

[LRDan]

Only this last time I have been able to get the nanocom on when it was going haywire.

I couldn't open any valves, and they were all closed except both rears (or fronts - cant remember) kept jumping between "open" and "closed" - this change would occur maybe twice a second.

Only fault was all sensors went out of range.. I believe the nanocom was happy talking to the EAS computer, but when it sent commands the car didn't do what the nanocom said it did.

[parasnoop67]

My 96 hse had a problem with the compressor running constantly, and the culprit was the blue pipe where it leaves the compressor. It had a tiny crack in it right against the fitting and after replacement it now works perfectly.

John

[LRDan]

When it was running constantly John, was the car getting extremely high? I've just had a look and all hoses for EAS look to be in good condition.

[parasnoop67]

No, the leak must have been sufficient for that not to happen.

The compressor would run 98 percent of the time but shut off occasionly for a few seconds.

The suspension was otherwise fine with the height sensors stopping it trying to take it too high.
Once the blue hose was replaced it is now fine.

John

[FANTOM P38]

G'day Dan,
I would try swapping out your EAS ECU for a known good one to see if that fixes problem. To me it sounds likely that is your problem.
more than happy to assist if your over this way sometime.
Good luck,
Martin

[FANTOM P38]

Hey Dan,
It may also be worth your while getting a compressor pump kit i.e. sleeve, o'rings, seals etc as you're pump has been running constantly.
The kit is not expensive nor hard to fit but will revitalize your pump once you get other issue sorted.

[LRDan]

Thanks for the very kind offer Marty!

Im actually living up Broken Hill way now so not sure when I'll have the car down that way! It hasn't done it since I've swapped relays around, but it has been a very, very intermittent fault. I think I'll continue the hunt if it plays up again!

Very good point with the pump kit, that had slipped my mind! Can you recommend any reputable places to purchase one from?

Dan

[FANTOM P38]

Give Dave a call At BCC in Nth Melb. im sure he has them.