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post #1 of 104 (permalink) Old 01-31-2009, 10:35 PM Thread Starter
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ABC Issues & More

The purpose of this thread is to collect and organize the best ABC-related intelligence—as well as general-interest and DIY material—thus far shared in this forum. Any and all interested parties are invited to make contributions, criticisms, and references wherever indicated.

Quote:
Originally Posted by Free Advice
Do not buy a W215 CL-Class Mercedes without FIRST familiarizing yourself with the ABC System. This goes treble for old and/or high-mileage examples. Research is a much kinder & gentler teacher than Experience.
For the uninitiated, the ABC (Active Body Control) system is Mercedes's electro-hydraulic suspension which constantly self-monitors and adjusts suspension settings thereby virtually eliminating body roll and pitch in various driving situations including cornering, accelerating, and braking. You'll find it on CL and SL models; however I note that it's been supplanted by Airmatic in most W216 CLs.

Quote:
Originally Posted by MBUSA.COM
Arguably the most advanced suspension system in production, ABC provides an excellent balance of ride comfort and handling while virtually eliminating bodyroll during cornering. A series of sensors and electronically controlled high-pressure hydraulics counteracts the effects of roll, vibration, pitch, dive, and squat. And to help adjust ride quality and responsiveness, the driver can select either Sport or Comfort mode via a button next to the shift knob.
We are linking some of the clearest and most-informative ABC threads in the next post in this thread. Please contribute your own--just link here to the posts if they're already on the forum, and I'll take care of the cleanup. No way can I do this alone.

This post (scroll down) now serves as a general-issues sticky for non-ABC matters. (See the next post for ABC Threads.) Like it or not, our cars are aging, they are quite complex, and they'll have issues from time to time. We're here to help each other.

NB: Keep in mind that the W220 sedans are mechanically very similar, and vastly more numerous. Therefore the W220 Forum here at BenzWorld has a greater wealth of information, much of which applies to our cars.

W215 Fuse & Relay Charts

http://www.benzworld.org/forums/w215...lay-chart.html

W215 hidden fuses revealed

http://www.benzworld.org/forums/w215...-revealed.html

Car Won't Start? Some possible explanations

http://www.benzworld.org/forums/c215...ertaining.html

Serpentine Belt + Tensioner (V12)

http://www.benzworld.org/forums/w215...tensioner.html

Mercedes CL500 Wiring diagram

(Sorry, broken Link needs Update)

Power assist doors & trunk issues

http://www.benzworld.org/forums/w215...-question.html

Transmission Shifter Stuck in Park (From W220 Forum)

http://www.benzworld.org/forums/w220...ols-heres.html

A/C Condensor Replacement

http://www.benzworld.org/forums/w215...ml#post9623009

CV Boot replacement with MB parts


http://www.benzworld.org/forums/w215...-mb-parts.html

Tire advice / consensus

http://www.benzworld.org/forums/w215...est-tires.html

Ozan's Unofficial Mods & Maintenance Center

http://www.benzworld.org/forums/w215...intenance.html

Edmunds Mercedes-Benz CL65 Long-Term Road Test

http://www.edmunds.com/mercedes-benz...roduction.html

http://www.edmunds.com/mercedes-benz...abc-fault.html

http://www.edmunds.com/mercedes-benz...ng-lights.html

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PS: And for God's sake, people, when someone goes out of his way to help you with a problem, have the decency to thank him and/or hit the 'Like' button. Way too many people vanish after their problem was solved without even saying thanks.

Last edited by Marsden; 07-16-2016 at 03:46 PM. Reason: Latest Update: July 2016
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post #2 of 104 (permalink) Old 01-31-2009, 11:12 PM Thread Starter
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These ABC Threads are not collected here because every post within them is gold. They're just a basic step in organizing the information. Comments (and contributions) are more than welcome. Also check out the ABC notes in the R230 Forum, many (but not all) of which apply to our cars as well.

ABC Troubleshooting Guide (From BenzWorld R230 Forum)

Active Body Control - Recall, Filters, Fluid

Can you just remove the ABC System?

ABC Problems - Alternate "Solutions"

Possible ABC Preventative Solution?

Importance of ABC fluid changes

Recurring Problems with ABC

ABC Light warning question

Arnott ABC Conversion Kit

ABC system in CL cars

Should I buy a CL?

ABC Reliability

ABC Diagrams

ABC Warning Light

ABC/PS pump squeal

ABC Fluid Maintenance

ABC Pump Removal Guide

ABC level calibration values

Is a ABC oil flush a DIY job? YES!

ABC Filter Upgrade & Fluid Check (Vid)

Strutmaster Conversion Kits Pros & Cons

Sticking rear ABC strut? Let's get it sorted

ABC Warning Over Bumps - Accumulators?

Recall for ABC problem means free fix or no?

W215 CL500 ABC Suspension System Repair

ABC Valve Block Repair / Rebuild (see next thread)

W215 ABC Pump/Valve Block/HPE Hose Repair (21 Pictures)

So what EXACTLY about the ABC prevents it from being removed?

HELP! Found wheel sitting in the wheel well after 3 days of no driving

Official MB Service Bulletin re: "Vehicle Level Lowers After Being Parked"

DTB PB 32.50-34 Suspension Lowering Issue: Causes and Corrections (PDF)


Last edited by Marsden; 07-02-2016 at 11:57 AM. Reason: Latest Update - July 2016 "W215 CL500 ABC Suspension System Repair"
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post #3 of 104 (permalink) Old 08-12-2009, 01:05 PM
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ABC issue

I am a new comer to this forrum and appreciate the tremendous amount information on this site. I own a 2000 CL500 (my 5th mercedes).
Last week a humming noise started coming, took it to my independent service guy, the hydraulic oil was real low. He also checked the transmission and power steering oil as well. The noise is still coming at low RPM only.
The suspension works fine, level ajdustment is fine and there is no ABC light.
I have three questions from the experts:
A. Is it ABC pulsation Damper/accumulator which is causing this humming noise?
B. one of the on-line auto part store listed two different accumulators e.g. (1) Center suspension accumulator return air suspension (P/N 220-320-0415-OR) $170 the other, (2) Front suspension accumulator (P/N 220-327-0215LEMF) $123. Which of the accumulator do I need to order?
C. The schematics diagram given on this site is not very clear. Is there an explanation to where this accumulator is located and how to get to it? and is there any precuations, bleeding etc is needed?
Thanks in advance
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post #4 of 104 (permalink) Old 08-12-2009, 06:43 PM
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Humming noise - might be a problem developing with the AC compressor - That is what happended to my CL500.....
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post #5 of 104 (permalink) Old 08-13-2009, 08:36 AM
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ABC Issue

Thanks for the resoponse
The noise persist with or without AC
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post #6 of 104 (permalink) Old 08-13-2009, 04:12 PM
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(P/N 220-327-0215 air reservoir) is the part you need. It is found under the car towards the front center slightly closer to the passenger side.
Lift on a hoist.
Let the car suspension settle for 5 minutes before removing the old Dampner. It is advised to bleed off the suspension, but my tech didn't do it.
It is a simple wrench off/on job and should take less than 10 minutes.
Remember to top up the ABC fluid afterwards as you will have a ruptured Dampner and it will have had some fluid trapped within.
Have the dealership do it for you and it will probably be no more than 1 hr. labour after they have inspected the lines first and then changed the Accumulator/Dampner.
Good luck and let us know how things work out.

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post #7 of 104 (permalink) Old 08-14-2009, 03:02 PM
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ABC Issue

Thanks Bob for your timely response.
I ordered the part you recommended and an extra quart of hydraulic oil.
I do not have a hoist, would raise the car on hydraulic jack and back-up stand and will try to work on it.
Hopefully I will not spill too much oil when I repace the accumulator
Will report on the results when the job is successfully finished

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post #8 of 104 (permalink) Old 08-15-2009, 04:27 PM
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No problem...you are welcome.

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post #9 of 104 (permalink) Old 08-21-2009, 07:01 PM
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Thanks a million to all the members for their response, particularly Bob who identified the accumualator P/N.
This afternoon I replaced the damper/accumulator and indeed it was very easy (I just had to buy a 15/16" wrench). The noise went away and the engine sounds like brand new.
Happy ending and saved lots of $$, learned a few new things and of course the satisfaction and sense of acheivement was in valuable
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post #10 of 104 (permalink) Old 08-23-2009, 11:27 AM
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Quote:
Originally Posted by Zia Mirza View Post
Thanks a million to all the members for their response, particularly Bob who identified the accumualator P/N.
This afternoon I replaced the damper/accumulator and indeed it was very easy (I just had to buy a 15/16" wrench). The noise went away and the engine sounds like brand new.
Happy ending and saved lots of $$, learned a few new things and of course the satisfaction and sense of acheivement was in valuable
That's great. Congratulations!

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