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Very strange ABC suspension problem

Glad to hear you're making some progress.

The lateral sensor for my 04 CL55 is A0045423418.

PM me know your VIN and I'll check if the p/n is the same.
 
I'll pm you the VIN tomorrow, I don't have it to hand!

Is yours a supercharged model?

Just wondering as mine is a 2001 and the part no starts with 002 on mine. Could be that this sensor was also updated (see post 11 on this thread)...
 
That's okay, I've just checked and the old p/n (A0025427018) was replaced by the new one in my post above for your model too.
 
I just typed a really long reply explaining that I took it to the indy and everything that we tried, but I lost it and really dont want to type it all agian!

Basically we have deduced that the front drivers side level sensor is giving incorrect signals and that is the problem.

Could someone please confirm the partnumber for it as I forgot to ask!
 
OK very random, I just went to move the car and the suspension is working perfectly now!!!!!! Took it for an 8 mile drive and it didn't miss a beat!!!!!
 
Bad connection onto sensor?
 
Bad connection onto sensor?


No, im home now so ill explain what we did!

Arrived there and put the car onto STAR, there were 17 codes for the ABC system!

Cleared all the codes, then started the car again, and it was doing its usual only raising the passenger side, and the rear drivers side about an inch. This was leaving no errors on STAR. He tried doing some activator test (not a rodeo) but from what I could see, it was like a shake down where the struts were forced to perform, again the passenger side was fine, the rear drivers did a little bit but the front did nothing at all.

We then took the car for a drive, got it up to 30mph, it leveled out as usual, and the blue ABC warning came up.

Arrived back, left it running and put it onto star, this then revealed four ABC codes, one relating to each corners level sensors.

We checked each level sensor voltage and the front drivers was over 4V, the others were all high 2V/Low 3V. From this we gathered that the front sensor was misbehaving.

We turned the car off and on so the ABC light went off and the car was in a state where the passenger side would work. Then we jacked up the front drivers side of the car, turned the wheel to the side and disconnected the top of the level sensor arm so it was free to move. While the car was running, he manually moved the level sensor arm up and down, this actually moved the strut, you could see that it was fully operational, he then moved it right to the end and we got a blue ABC error of being too high or something. We reset this error and then got another blue error of front drivers side level sensor reading.

After this, we moved the sensor arm back to its original position and tried to reset the code on STAR but it would not reset so we reattached the arm and put the car down.

When we put the car down, the front strut was raised two inches and every other strut was where it would be when on its lowest setting, we tried resetting the code on STAR and by turning the car on and off but this had no effect. The car stayed in this state and none of the tests on STAR would activate any of the struts.

We decided that that level sensor was broken and I should order a new one, also the track rod end on that corner needed replacing!

Anyway I drove the car afew miles back to work to finish off some things, when I came back out, I started the car and no ABC error came up, I thought hmmm thats strange, pressed the raise button and the whole car raised!! Lowered it and raised it again around 20 times to make sure I wasnt dreaming and it worked fine!!!!!!!

I still think the level sensor might need replacing, Im going to keep an eye on it over the next few days.
 
Thanks for everyone's help as well btw! Ricky as always, Alx, Dieselman, I owe you guys a drink :).
 
m2287 said:
Thanks for everyone's help as well btw! Ricky as always, Alx, Dieselman, I owe you guys a drink :).

Aidan,

If you get the chance it would be absolutely worth measuring each lowering link-rod. Do not measure by "eye". It is possible (as you have already lowered your car) that one side might be just outside the voltage range. You would have adjusted one side more than the other at some point to give you the symmetrical "stance". A couple of mm is all it takes to set the fault code if your at the limit of the voltage range.

When measuring each lowering rod measure from the centre of each ball joint socket. I think you will probably find there is a difference. HTH
 
Aidan,

If you get the chance it would be absolutely worth measuring each lowering link-rod. Do not measure by "eye". It is possible (as you have already lowered your car) that one side might be just outside the voltage range. You would have adjusted one side more than the other at some point to give you the symmetrical "stance". A couple of mm is all it takes to set the fault code if your at the limit of the voltage range.

When measuring each lowering rod measure from the centre of each ball joint socket. I think you will probably find there is a difference. HTH


I see what you are saying, they are easy to take off so I'll try and look in the morning!
 
Just to update everyone, the car was rodeo'd a few weeks ago and has been perfect since :)
 
More ABC PROBLEMS.....

RED ABC light comes up now and then for the last week. Had it scanned and got low pump pressure.... Time for some DIYing....

Got my old pump which I had already replaced with a second hand one around 2 years ago, ordered:

Mercedes Benz ABC Pump Seal Kit MBZABCSEALKIT

Ridiculously fast shipping with these, ordered them at 7pm Wednesday night, they were at my door at 9.40 on Friday morning, from the USA!!!!

Used this guide:

DIY: ABC pump rebuild (Pictures + steps) - MBWorld.org Forums

And rebuilt my pump. Before the rebuild, you could feel movement from the pulley, it would move in and out by around 2mm, it would also spin really freely. Now it feels tight, it doesn't have any movement and spins but feels solid.

Will install it in the next week and let you all know how it goes. If it works I will be rebuilding my now broken pump and keep it as a spare!
 
Alright Ed Adian China :D
 
So last night me and a mate did it on the drive, took 2 and a half hours, had a couple of problems priming it without star but.......


It works!!!! Costs:

Rebuild kit: £100
Hydraulic fluid £65
Beer: £10 (very important!)
Total: £175

Not bad considering a new pump is in the region of £1000, not including 4 hours of labour!

I'm going to rebuild the now broken pump as a spare!
 
The problem is




Aidan,

As I have pretty much encountered every ABC related problem over the 8 years I have had my car I believe I have the answer to yours. DO NOT DRIVE until you check the following : Front Acceleration sensors and 1 rear acceleration sensor. There are 3 in total (2 front, 1 back). The front ones are located on the suspension top mounts, open the bonnet and you will see one on each side. Check the numbers on these sensors, there are updated sensors available. W215 had a major problem with acceleration sensors and a big recall campaign. My car decided to drop and raise itself as fast as possible at 70mph. The unexpected ride height change could make you lose control of your car as there is no way of predicting when it might happen. So drive carefully if you must drive it at all bud.

Here is the "official" explanation ;

Level changes occur intermittently and predominately after driving for extended periods. The vehicles level adjusts without obvious cause and usually quickly moves upwards or downwards and then rapidly corrects back to the specified level.

The Random Level Control is the result of contact issues on the printed circuit board of the body acceleration sensors (front left, front right and rear right-Model 215/220), in combination with the sensors heating up after an extended period of driving.

The contact issue can result in a higher internal resistance on the printed circuit board causing the sensor to output an incorrect signal, thus initiating an ABC adjustment.



For Model 215/220

Equipped with Code 487 (Active Body Control) RANDOM VEHICLE LEVEL
If the vehicle lowers randomly while driving or sporadically after stopping the vehicle, replace the body acceleration sensors with a manufacturing date greater than year 2002 wk. 01.

Note: Do not replace any other ABC suspension components.

Qty= 3; Part Name= Acceleration Sensor; Part Number= A004 542 35 18

Replace the two FRONT (left and right) Accel. Sensors for ABC and the REAR (right) Accel. Sensor for ABC.

Labour should be about 0.6 hrs for each of the two front sensors and 2.2 hrs labour for the right rear sensor. Call your dealer for parts pricing.


I bet that this is your problem. Only a STAR will pick up the codes for these sensors. Hope that helps you out. :thumb::thumb::thumb:
Thanks for the input...I know this is old thread but this started happening to me yesterday. Thought I was going crazy. First, rear left lowered then raised then front. Then it was like car was doing it's own Rodeo test. Stopped then later in day did it again. NO errors and haven't ran codes yet.

rebuilt suspension minus new shocks and the valve block about 2 years ago...was hoping it wasn't the pump
 
Thanks for the input...I know this is old thread but this started happening to me yesterday. Thought I was going crazy. First, rear left lowered then raised then front. Then it was like car was doing it's own Rodeo test. Stopped then later in day did it again. NO errors and haven't ran codes yet.

rebuilt suspension minus new shocks and the valve block about 2 years ago...was hoping it wasn't the pump

I’d disconnect the level sensors and work them up and down/lubricate them as a first step.
 
Thank you. Will give it a go.Cheers
 

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