front end stays down

[thom0385]

Hi Forum

As I have mentioned in my other post "hard suspension" I have just changed the center sphere. That was a big job but everythig is asambled and along the way I got some great advises from Kees.
Now the reason for this post is that the problems have changed. Now the front end wont raise but stays down no matter what position of the selector.
Status:
Everything is tight and no leaks.
Height corrector is working
both front suspension legs new
both front spheres and center new
air bleeding proceedure carried out 15+ times
rear end goes up and down perfect
Pump is running
There is no pressure when i open the valve on top of the right side suspension leg even though I use high, low or normal height and pump is running.

Any advise/help is appreciated as im running out of ideas
Best greetings
Thomas

[furriegurrie]

Sounds like air in the system. It might take a while before this is out. You might even have to put some pressure on the LDS tank to help the pump priming and pushing the air through.

[thom0385]

@furriegurrie thank you. I have seen some posts about putting presure on the LDS tank now and i will give it a try. 0,5 bar right? seems very little that pressure

[Kees]

I think there's a other problem, in your other post you mentioned, that the back works fine.
This means, the pomp works properly.
Because there are no LDS comes from the right strut when you open the nippel means that the valve in the BHI is not open, you have one for the front and one for the backside.
There are 2 possible reason for this.
1e: the solenoid is broken. But every thing works fine before, i don't think this is the case.
2e: The problem comes from the high sensor, the system think that the height of the car is oke, for this reason the front valve in the BHI will not open.
So you have to use a diagbox what is wrong with the value of the front sensor.
Greetings,
Kees.

[thom0385]

@Kees Thank you, I will hook it up with Diagbox, do you know in what part of the diagbox i find the values?
Greetings Thomas

[thom0385]

I have now been through the Diagbox options. I get some trouble codes when i scan it fullly.

U1118 no communication with the BSI box
U2118 Activating. Error receiving hight correction info
U2005Activating. Error receiving vehicle speed info
This is more or less a direct translation from danish to english so i hope it makes sence.
I have done a BSI-reset but it dident help

Hope some of you can give an idea of what might be wrong
Best greetings Thomas

[aerodynamica]

Did you ever disconnect any electrical plugs? Possible one of the pins in the multi plug at the BHI unit is not making contact? Or perhaps the plug at the height sensor.

Also: if you replaced the front height sensor did you ensure the 'arm' of the sensor was in the right position? These are able to rotate 360° on the sensor however the action used is really only small (say, 15°) but it can easily be attached to the plastic link at 180° wrong position and in this situation the continuity of electronics will be correct however the physical position will be wrong. It's very easy to get this wrong on the front one because it's difficult to see.

[Kees]

As i say, before, it's possible, that you make a mistake with the connection of the high sensor.
Now you have the conformation, because of the error 2118.
For me i think you should look at the position of the connection rod on the high sensor, for example if it point upward, you should turn it down or, when it point down, then put it upward.
The error 2005 can you ignore, this one comes from the diagbox itself.
Maybe that Marc can tell you what the correct position of the high sensor arm must be, when you connect it with the arm.
Greetings,
Kees.

[Kees]

On this picture you can see, that you have to align the hole G, with the high sensor before you make the connection with the arm.

Greetings,
Kees.

[Kees]

This shows the wrong position.

Greetings.
Kees.

[thom0385]

Thank you aerodymanica and kees

I dident dismantle the small arms on the hight corrector, but i did loosen the clamp and tried to change the position of the clamp and tighten it up again. While moving the clamp/ change its postition i had the engine running and i could hear the pump start when i slowly turned the clamp in the direction of higher position. That i assume indicates that there is connection in wiring. Can it be a fault in the solenoid on the center sphere? Before changing the sphere i had the solenoid dismantled and make sure alle moveable parts are working. I gave it 12volt and it did click so i think its alive. Does the solenoid lock down the whole delivery of presure to the front suspension or does it just cut out the center spfhere?
Thang you for all the help
Best greetings Thomas

[aerodynamica]

Hi, I think this centre solenoid is normally open and not energised. In that state I'm certain that fluid pressure can freely move through the centre regulator.

If you're saying that you heard the pump operating when you moved the loose clamp on the anti roll bar, surely that indicates the system is operating? How long did you let it run? Maybe it needs to be allowed to run longer.

Kees suggests the raise solenoid at the BHI may be faulty. If you can make the pump activate by moving the loose clamp but still no pressure goes to the front suspension then possible this is the fault.

I don't know enough about the BHI unit to know if the pump is able to run where a faulty raise solenoid is present. Where does the pressure go to? Perhaps through past the closed front raise valve and back to the LDS reservoir.

[thom0385]

@Kees and @aerodynamica
Thanks for the replies
So i thing i should aim at the solenoids for raising the front end. Are they located under the pump? do you by any change have a drawing/photo of it?
I will also follow your suggestiuons about checking the wirings since they have been moved to the side for better acces.
One more question: I know there is a big fuse for the pump but do the solenoids for the front open/close also have a fuse?
Best greetings from Thomas

[Kees]

There is just 1 fuse for the BHI, this is 10A.
But i think there's nothing wrong with the solenoid inside.
You say, the pomp start running when you move the clamp on the anti-roll bar.
In an other reply on you i have said, that because there is no LDS comes out of the nippel on the right strut means, the system sees the car is too high.
So, if you sure that the position of the arm on the high sensor is down as on the first picture from me then turn the clamp on the anti-roll bar until the pomp start, wait until it stops and see what happens it can take a will before the front end will rise.
If it doesn't rise turn the clamp a bit further, but make small adjustments.

[thom0385]

@Kees
Thank you i will follow your advise with the small adjusting of the clamp.
The 10A fuse for BSI is located inside the car?
Best greetings and have a nice weekend
Thomas