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Very strange ABC suspension problem

Ricky, I did actually check the sensor at the top of the rear drivers strut earlier and it's in perfectly (I just changed that specific strut but I know the strut works as I helped remove it from the donor car) so it's not that... I did think about one the sensors being faulty but again the car was doing this before I changed them and it did work perfectly after I had changed them (for a day)!

I don't know if it's the pump as the passenger side works on the button up and down PERFECTLY and the red error never appears, just the blue one. Even if I pump the suspension up and down for 50 cycles it doesn't come up with any errors at all until I drive it at 30mph. If it had low pressure wouldn't the red light come up? Also that wouldn't explain why the ride height on the passengers side doesn't go as low as it should?

Thanks for your help as always, it's massively appreciated! I think I just need to get it scanned properly...
 
It reads like the system is confused. possibly a battery disconnection might work, or a reset.
 
Did try disconnecting the battery before and it made no difference :(... Going to see if I can get it scanned tomorrow...
 
I think the system adopts different settings above 30mph, which is why is suddenly decides to work properly.

I suspect a reset will fix it.
 
Dieselman said:
I think the system adopts different settings above 30mph, which is why is suddenly decides to work properly.

I suspect a reset will fix it.
Click to expand...

I don't suppose you know if it can only be reset on star, my Indy is 9miles away and I'm friendly with the guy in the garage round the corner (he already offered to scan it for me!)...
 
From what you describe - passenger side raising itself all the way up on lowest setting - sensors appear be confused. You didn't touch the links by any chance when you did the suspension?
​
 
Alx said:
From what you describe - passenger side raising itself all the way up on lowest setting - sensors appear be confused. You didn't touch the links by any chance when you did the suspension?
​
Click to expand...

No, didn't mess about with the links, especially the passenger side, I didn't do anything to that side of the car. Also this is the problem which made me check the struts in the first place, I then saw that the rear drivers side one was knackered, have replaced it and am still where I started!

I also just swapped that other sensor I linked above and it didn't make any difference!

Will have to wait and see what the computer brings up tomorrow!
 
m2287 said:
No, didn't mess about with the links, especially the passenger side, I didn't do anything to that side of the car. Also this is the problem which made me check the struts in the first place, I then saw that the rear drivers side one was knackered, have replaced it and am still where I started!

I also just swapped that other sensor I linked above and it didn't make any difference!

Will have to wait and see what the computer brings up tomorrow!
Click to expand...

Aidan

Please check this thread

http://www.benzworld.org/forums/w215-cl-class/1580468-abc-failure-please-help.html

Very similar problem. Might be worth a PM to the original poster.
 
I'm getting it scanned at a local garage today to see what it says, If I have no luck I'll be taking it to the specialist with STAR.
 
BTB 500 said:
Someone I know broke her neck (survived) when the new-ish LR Discovery she was a passenger in had a suspension glitch and went off a motorway embankment ...

This was a few years back, don't remember which Disco version it was.
Click to expand...

this also happened to a wife of a chap i worked for here in leicestershire when she went over a hump back bridge. T.
 
Update... Tried the car earlier this morning and it did the same as last night, took the battery off for 30mins, now I get the red ABC warning light come up instantly, and going from lock to lock on the steering wheel doesn't get rid of the abs/esp warning that comes up.

Also the ABC reservoir is full to the brim (it wasn't last night) I have a feeling it needs bleeding more and air in the system might be causing the red error.
 
Last edited:
If it's the air, it could very well be nitrogen from one of the accumulators. There's a diaphragm inside that could have burst. Do you know how old your accumulators are?
 
Alx said:
If it's the air, it could very well be nitrogen from one of the accumulators. There's a diaphragm inside that could have burst. Do you know how old your accumulators are?
Click to expand...

Yea I did check the rear accumulator when I took the valve block off and it was perfect.

I don't think I bled the strut right in the first place as it was hanging in the air when I did it.

I've put the bottom arm on an axle stand and left it standing on that so the strut is compressed fully, I'll try bleeding it again when the red ABC error disappears (I have found this takes a good few hours). I did already unscrew the bleed valve and next to no fluid came out so it must have air in the line!

The esp warning has now disappeared when I start the car up which is good.
 
Although I'm getting better at it but bleeding brakes usually takes me two attempts to do properly and that's with using a pressuriser. You want to make sure there's absolutely no air in the system before moving on to check other things.

On a side note, I wonder if one can pressurise and bleed all 4 struts in the same manner as brakes. In theory that should help get rid of all air, you just need a pressuriser big enough to flush and refill in one go.
 
I still can't bleed it as the red ABC light is still being displayed so the raise button doesn't work :(...
The fluid reservoir is very full, would this have any effect, I wouldn't imagine so?

The garage round the corner said they will come to mine tomorrow and scan it since I can no longer drive it!
 
If you pressurise the reservoir and open bleed screws one by one, then yes there will be some effect. You'd need to jack the car up to get to the screws of course.

Let's see what the garage guys say tomorrow.
 
As you guys can probably tell, I'm persistent!

Emptied the abc reservoir a bit and voila the car was back to its old tricks of only raising on the passenger side.

Swapped the two front accelerometers with the old one to see if it made a difference... Nothing.

So I took the rear of the car apart and swapped the rear accelerometer (above the rear drivers side strut) I noticed it has a different part number to the front ones (I thought they were all the same), so I swapped it with the original and now the rear drivers strut raises about an inch when you press the button, but the front drivers side still stays on the ground.

Again when I drive at 30mph, the car levels out on what would be the middle setting.

I thought that maybe the sensor in the cabin that I linked last night might also have a different part number, so I took the carpet away and had a look, I can't see the whole thing as it's located right behind an air duct but it starts with 02, the ones I tested it with we're 04. Now can anyone tell me the part number for the following sensor:

ABC Lateral Acceleration

It's the only one I haven't changed and appears to control each side of the car.

Aidan
 
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