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All other valves (in valve block) are closed. air to be compressed is sucked out of the vehicle longitudinal This is Mark the Level Control Valve Unit (Y36/6) with the colours of the air lines. wheelhouse. Information reported by level sensors can be viewed using DAS. If the solenoid valve coils (y1, y2) are not actuated, the spring-loaded . The indicator lamp (1) is on. It is possible to purchase on eBay a refurbished front and rear air spring which is the top part of an air suspension strut for around EUR 120 and mount it to the original damper unit (the lower part of an air suspension strut). You'd have to do the same thing with standard shocks, too - but Airmatic will be more expensive. F3, I. STAR Diagnosis System (SDS) or Diagnosis Assistance System (DAS), https://w220.wiki/index.php?title=Airmatic_Adjusting_Levels_Using_DAS&oldid=7145. A bumping or knocking noise coming from the top of the front suspension may indicate a worn upper mount rubber bushing in the Air Spring. Refurbished Air Springs are available from Suspension Workshops. Fault in component Y53y1 (Left rear solenoid valve 1) in assembly Y53 (left rear axle damping valve unit). If the vehicle is low, but there is no red error message in the instrument cluster The strut tube (a) is covered by a protective boot or bellows. Pressure from the reservoir is also used when the vehicle is stationary to minimize noise. In addition, a fault code is stored in the control module. A sensor element compares the fluid pressure (b) to be measured retaining plate as the AIRmatic Compressor Unit (A9/1). In the event of a fault in the suspension system or in the level adjustment system, Soiled pressure line connectors must be cleaned before unscrewing. Since the compressor is not designed for continuous operation, the absolute running time and cooling phase are monitored to avoid overloading the compressor. In some countries such modified cars will not pass annual technical inspection. Usually, in case of valve block leak the vehicle will not be completely down, since the residual pressure holding valve at the air inlet to the struts will prevent the pressure dropping below a pressure of 4-5 bar. in which case the vehicle is equipped with Active Body Control (ABC) hydraulic suspension system with additional computer control. Once the silica gel gets saturated with water, the moisture will get in the system. solenoids form the solenoid valve units (y1, y2). Conclusion: This real world Central Reservoir and its associated supply line to a brand new Level Control Valve Unit (Y36/6) or Valve Block produced a leakage rate of 0.0 bar in 120 secs, which is well within the specified 0.5 bar in 120 secs. M-B DAS states the drop in vehicle height must be less than 20mm (30mm in very cold conditions) in 10 hours, ie less than 2mm per hour is allowed. controlling the solenoid valves. The "Sport 1" setting makes the damping somewhat "harder". The level control is partially switched off depending on the fault that occurred. The AIRmatic Level Control Valve Unit (Y36/6) or valve block on top of the AIRmatic Compressor Unit (A9/1) fails (very common) and fails to close some valve. When replacing the air compressor the air compressor relay (K40/7kO) should always be exchanged as the switching contacts may be damaged. Wait for approx. (left image) the strut top plate with the hole for the damper, (center image) the strut top plate with the upper mount rubber bush in place waiting for the nyloc nut, (Note: an impact wrench is used to tighten the nut (with Loctite applied) to the damper piston rod.). Inspect the wet connection as the bubbles caused by a cracked O-ring can be small and may develop very slowly. particular front wheel or rear axle until the vehicle has reached its specified value. slow rising or non-rising suspension. 14 Enter in the inclination angles as measured or alternatively enter the angles shown in the example. than +/- 20 mm. Remove bolted connection (1) of thrust arm (4) on rear axle carrier. message on the instrument cluster, "AIRMATIC STOP, CAR TOO LOW!" Jack up one side of the car as required. Excellent replacement tutorials for the rear struts are available here: As already described, a very common reason for a leaking strut is damage in the strut's rubber air bag/bladder (h). With this information, you can make informed decisions about repairs and maintenance, saving time and money. 1.inspect the level sensors first *Inspect the front level sensors. Valves do not close tight, letting the air through. For this purpose a strut bypass valve below can be used. The AIRmatic with ADS control module monitors all the important components of the system after they are switched on and during operation. Only when installing a new air compressor. Pressure is equivalent on all 4 corners. Mercedes-Benz Sedan / Coupe / Wagon Forums, Drive the car to the most level surface available, leave the engine running, then measure from the center of the hubcap star to the point directly above it on each wheel, and, Carefully measure the length of the rear sensor link and. Do not fully remove the Stub Screw, just unscrew them so that about five threads are showing. Remove spring strut (40) downwards towards the side. It won't take much longer but will last longer and work just as well as a desiccant. Part number 4RA 007 791-011 (A0025421319). Located on the AIRmatic Compressor Unit in the right front fender, the Level Control Valve Unit (Y36/6) is the central control unit for the level control, level adjustment and suspension. However, the vehicle lowers to regular level when you exceed a speed of 75 mph (120 km/h) or maintain a speed of between 50 mph (80 km/h) and 75 mph (120 km/h) for more than 5 minutes. Installation:Attach connecting rod (86) to the outermost hole (f) on the upper wishbone (6). stationary the pressure from the reservoir is used for noise It is not uncommon for the torx bolts attaching piston head to the compressor to break. Fill suspension struts (40) in question using, Nut, front suspension strut to front end: 20 Nm, Bolt, front suspension strut to spring control arm: 20 Nm, Air suspension pressure line to front suspension strut: 5 Nm, Depressurize suspension strut concerned (41) using. level by the reservoir (only with a reservoir pressure > 11 bar). Bypass the complete air line with an aftermarket high pressure flexible nylon pneumatic line. Excellent replacement tutorials for the front struts are available here: Replacing rear strut is more time consuming than replacing front strut. Note that with all new Arnott AIRmatic struts you lose the electronic damping feature. Torque bolted connection (2) of suspension strut (41) on spring control arm (72), Torque bolted connection (1) of thrust arm (4) on rear axle carrier (if this bolt was loosened or removed), Torque bolted connection of spring control arm (72) and wheel carrier, Suspension struts: Nut, rear suspension strut to body: 20 Nm, Suspension struts: Air suspension pressure line to rear air spring: 5 Nm, Suspension struts: Nut, rear strut to spring control arm: 110 Nm, Spring control arm: Self-locking nut, to rear subframe: 50 Nm + 90 degrees, Spring control arm: Self-locking nut, to rear axle carrier: 70 Nm. Stores compressed air for level control. BenzWorld.org forum is one of the largest Mercedes-Benz owner websites offering the most comprehensive collection of Mercedes-Benz information anywhere in the world. If required close the opening of the residual pressure holding valve (k) with a short bolt M8, so that no dirt can penetrate into the air suspension strut. This happens, for example if the vehicle level falls below a critical level when loading the vehicle or if the driver has set the vehicle level to "raised level". level in order to be able to readjust the vehicle level (raise or The best protection is to become familiar with the early signs of Airmatic problems, and fix them right away. Ensure the plastic cover clips well over the metal lugs on the metal block. The "Sport 2" setting immediately sets the damping force to "hard". through the inlet valve (e) in the piston crown into the clearance Fault in electrical solenoid valve. The vehicle will be high only while the car is off, since as soon as vehicle is started the computer will try to adjust the level to the programmed level. However the strut must be filled while the protective boot/bellows (n) is aligned to the Damper Support Bearing. Detach the connector of 'P' port and spray the port with leak detection spray. Pull intake hose with air filter (2) out of longitudinal member. Signal from level adjustment switch (N72/1s2): The control module uses the signals from the level adjustment switch to determine the driver's preferences for the vehicle level: The control module uses the vertical body acceleration, longitudinal and lateral acceleration of the vehicle and the ground speed to determine the optimum level of damping. Rusty or broken electrical contact pins of pressure sensor or valve control. If the voltage falls below 10.5 V or exceeds 17.5 V, the system is switched off until the voltage returns to the specified range. Unscrew pressure line connection (1) from AIRmatic compressor unit (A9/1). Comfort and sport switch signal (N72/1s3): The comfort and sport switch signal informs the system about the selection made by the driver between one comfort-oriented and 2 sporty damping maps. Webthe airmatic central reservoir, located behind the bumper in front of the driver side wheel well is rarely a cause of issues in the w220, however should be checked during routine. recognized by the control module, the spring strut valves are The moisture is delivered back Introduced on the W220 S-Class for the 2000 model year, Mercedes-Benz began equipping various models throughout their lineup with an air-suspension system dubbed "Mercedes-Benz Airmatic". chambers of the single-pipe gas-filled shock absorber. As the mounts weaken with age they can lose their compression and cause a bumping sound. The lower flared conical part of the air spring protective boot/bellows (n) is the "air spring plunger". member through an air filter/cleaner and into the chamber underneath the In addition the AIRmatic pressure release valve (y1) in the AIRmatic compressor unit (A9/1) is open and the compressed-air is reduced via this valve. Note this method was published by MB World Fanatic aleksandar1099 ([1]) and refers to a W211 but equally applies to W220 models. However, silica gel degrades after very few cycles if heated to 110C or more. Unlike the OE Air Bag/Bladder, re-manufactured ones usually use two ply rubber design that prevents vertical wear points and the Air Bag/Bladder is usually over two times thicker than the original one. To test whether central reservoir can keep pressure DAS can be used which has a pressure test for reservoir. 10s: "AIRMATIC LEVEL SETTING CANCELLED". The compressed air is forced on 2000 S430 (Dad's car, for special occasions). I was thinking it myself; he just beat me to the punch. (these height adjustments are so small that you may not notice any change): The selected vehicle level setting remains stored in memory even if the engine is turned off and restarted. Remove the complete front axle AIRmatic spring strut (40) from the vehicle. Fill the air spring (using the DAS or other means), and in the process pull the air spring plunger (7) downwards firmly by hand so that the air does not escape between the air spring plunger and the Damper support bearing (picture 2 and 3). If the Ride Height sensor is broken, damaged or locked, it will cause the AirMatic system to get confused and not maintain ride height; Rear Height Sensor Calibration was not carried out. Thread Rating: Seal off the pressure lines immediately to keep clean by placing the exposed ends in small plastic bags sealed with tape. Douse with the whole assembly with WD40 or similar and wriggle, wriggle and wriggle until the two halves of the valve block come free. If the raising of the vehicle is cancelled due to the driving speed, 1.11K subscribers Subscribe 11K views 1 year ago Hello Everyone! This process is reversible. Use a dielectric grease sparingly on the o-rings. We did not have to use. For the DIY Procedure see section "Replacing the Air Spring in an AIRmatic Strut". (Note: This is the cheaper option but requires dismantling the failed Suspension Strut. Unscrew nut (85d) of control rod (85) at level sensor (B22/3) and remove control rod (85). Replacement AIRmatic Front Axle and Rear Axle Air Springs are also available and can be installed with the original damping unit (see sections below). in the valve unit and a pressure relief valve on the AIRmatic compressor unit.

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