The compressor is controlled via a relay. If the car is within the voltages specified in the page before, the car will accept the new level setting, if not it will reject it, and you will need to repeat t he procedure. Electronic level control which maintains a constant even level at the front and rear axles according to the driving and vehicle load conditions. Note the Upper Mount Rubber Bushing can be replaced without removing the strut for the car. Used to remove and install the brass residual pressure holding valves at each of the air inlets to the front air suspension struts. The Airmatic Compressor Relay (K40/7kO) is located in right fuse box, location 'O' (the first one next to the three 40 amp fuses). volume. Before replacing a supposed leaky AIRmatic strut, always carry out a leak test on the head bearing using soapy water. Before replacing the strut, the leak should be verified by directly pumping the air to the strut and observing if the strut loses the air. Unscrew nut (86b) on connecting rod (86) from upper wishbone (6) and remove connecting rod (86). It is connected to the unit by a hose. closes and the air is compressed. This error code is shown when the AIRmatic system supplies or releases air from the strut, but does not observe the intended effect (likely level sensor or pressure sensor does not show the expected result). about the vehicle level being to low, the level sensor (or its linkage) is at fault. How To Reset AIRmatic Suspension in w211, w220, w221? Seal off the exposed pressure line ports immediately with blind plugs if possible. Includes: steel cap, brass valve and spring clip. A. They do not necessarily need to be exchanged for a new suspension strut. There is a risk of damaging other strut on the same axis. Signal from body acceleration sensors (B24/3, B24/8, B24/9): The vertical acceleration of the vehicle is calculated using the signals from the body acceleration sensors. How the Mercedes Airmatic Suspension Works. Use unscrewing (instead of pulling) to remove the bolt. in the vehicle level are required, such as during an obstacle-avoidance maneuver. Its task is to execute all control functions of ADS and AIRmatic. The AIRmatic Level Control Valve Unit (Y36/6) is attached to the same The pressure relief valve integrated in the AIRmatic Compressor Unit (A9/1) is used to lower the vehicle. 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. Stores compressed air for level control. Unscrew nuts (arrows) and remove AIRmatic compressor unit (A9/1). After all valve block valves were closed the compressor produced 10.8431 bar within 10 secs which is withing the specification of 10 bar within 40 secs. W220 base, right rear . Introduction If you try to adjust the levels of a M-B using a STAR Diagnosis System (SDS) or Diagnosis Assistance System (DAS) you MUST NOT just go to "actuations" and then lower it or raise it as IT WILL NOT STAY ADJUSTED this way. I'll order some new links front and rear from Mercedes in the next couple of days. level by the reservoir (only with a reservoir pressure > 11 bar). Both suspension systems are responsible for the superb ride and handling of the W220 and being complex systems will require maintenance. If the leak cannot be fixed immediately remove the AIRmatic compressor relay (K40/7kO) to disable the AIRmatic Pump. With increasing speed, ride height is reduced by up to approximately 3/4 in (20 mm). O. 14 Enter in the inclination angles as measured or alternatively enter the angles shown in the example. than +/- 20 mm. Minor leaks can develop very slowly so be patient. Wabco air suspension compressor piston ring replacement. In this case a message appears on the multifunction display in the instrument cluster to warn the driver: "Stop car too low". Note the newer W220's post '03 and ones which have been modified with new replacement parts do not leak at the top seal which is an 'O' ring around the metal cover disc. Excellent replacement tutorials for the front struts are available here: Replacing rear strut is more time consuming than replacing front strut. "Sports 1" - one indicator lamp (1) is on. 12 Once you are happy with the new levels, select F2 to continue and see Entry of values stored in the inclination measuring instrument. Disconnect connectors at front left and right level sensors (B22/8, B22/9), Unscrew nut (86c) on connecting rod (86) from front left and right level sensors (B22/8, B22/9). Function in vehicle condition "Ignition ON". Your choice of suspension style, "sport" or "convenience", which you select using the damping switch. Release the car from the jack slowly to check that the strut has enough pressure. Airmatic - W220 S-Class Encyclopedia Airmatic Contents 1 Introduction 2 Description 3 Features 4 Advantages 5 Function 5.1 Pressure Supply Function 5.2 Level Control Function 6 Components 6.1 Location of electrical/electronic components 6.2 Location of pneumatic/hydraulic components 6.3 Compressor and cable related parts I'd chuck them in the bin and fit the proper MB ones, and then you will likely find that its still got the factory Calibration in the Airmatic Module and will sit properly. If the raising of the vehicle is cancelled due to the driving speed, Each strut has an air spring containing an air bag (bladder) and a dampener built-in to the one unit. AIRmatic Compressor Unit (A9/1) failure or partial failure. Note: Air suspension struts on which the Air Spring Plunger (7) is separated from the Support Bearing can sometimes be filled with air again without problems. The EMERGENCY Procedure, or what to do if your car is sitting on the ground, is shown below. That is to say, the AIRmatic with ADS control module receives signals from the door contact switches, the trunk switch and infrared remote control indicating that the driver may soon start the engine and drive the vehicle. But. Replacement AIRmatic Front Axle and Rear Axle Air Springs are also available and can be installed with the original damping unit (see sections below). 1 minute). When the vehicle is stationary the level is readjusted if there is a difference of more than +/- 10mm after a door or the trunk lid is opened. Measure the height at each corner of the vehicle and record the results. For the location and routing of the AIRmatic air lines see above. Permissible difference in vehicle . To test whether central reservoir can keep pressure DAS can be used which has a pressure test for reservoir. In fact, Arnott provides limited lifetime warranty [3] for their AIRmatic Air Suspension Struts. Before attempting any DIY repairs make sure to read the tips section above. However, be warned that a very small leak caused by a cracked or damaged O-ring on one of the air line connectors may still pass the SDS AIRmatic Pneumatic Tests. Mercedes 2002 s500 w220 Airmatic Visit workshop warning on dash. Installation: After installing, the bolts (40c) must close at least flush with the suspension strut (40) or be seated slightly lower in it. Mercedes Suspension Level Sensor. As another example the following result was obtained for a leak test between valve block (Level Control Valve Unit (Y36/6)) and central reservoir for a FAULTY Level Control Valve Unit (Y36/6) or Valve Block. Look at the sensor setup and make certain that nothing is loose, bent, or misplaced. Unscrew bolts (86d) on retaining plate (86a) and remove front left and right level sensors (B22/8, B22/9), After replacing the level sensors, calibrate vehicle level with Star Diagnosis (level calibration), Nut, level sensor connecting rod to upper wishbone: 10 Nm, Nut, connecting rod to level sensor: 5 Nm, Bolt/nut of level sensor to retaining plate: 4 Nm, Disconnect plug from rear axle level sensor (B22/3), Unscrew nut (85e) of control rod (85) from stabilizer bar intermediate lever (81). Proceed as follows: If the head bearing is not leaking and the plunger is fully seated on the support bearing then the options are to; If a replacement front axle spring strut (40) has been procured, it is quite an easy task to swap them over. If test shows that reservoir cannot keep the pressure, before replacing it, check with leak detector solution to test if the line to reservoir is faulty. Valves do not close tight, letting the air through. The "comfort" setting maintains the damping within the comfortable range as far as the driving style and road conditions will allow. (Alternatively four off 8mm nuts can be welded together to make one off 'long' nut.). Low aerodynamic drag and fuel consumption as vehicle lowers above 70KPH. 8 Select F3 to see Initial startup and Select Initial startup with manual settings input etc. After 120 secs elapsed time the Central Reservoir pressure = 10.57 bar. Prepare the strut top plate to take the Damper Unit. A mechanical spring version of the complete suspension strut which eliminates the pneumatic parts can be bought from Strut masters. Front air shock replacement (by BILSTEIN), Front air shock replacement (by David Prokity), Location of electrical/electronic components, Location of pneumatic/hydraulic components, Design of Level Control Valve Unit (Y36/6), AIRmatic Suspension Spring Strut (40, 41), Design of Air Suspension Spring Struts (40, 41), Function of Adaptive Damping System (ADS II), Design of Damping Valve Unit (Y51, Y52, Y53, Y54), Components of Damping Valve Unit (Y51, Y52, Y53, Y54), "AIRMATIC VISIT WORKSHOP!" In addition the system has an AIRmatic Central Reservoir (42) which stores the compressed-air. The AIRmatic central reservoir charge (y5) is also installed in the valve unit. However, there are also available cheap and reliable plastic "push in" connectors which can be used to easily connect air lines without any tools. PDF W220 S-class Encyclopedia - Start Here - Mbca For the DIY Procedures see the sections below. The front left, front right, rear left and rear right level valves (y1, y2, y3, y4) are opened as required and the compressed-air stored in the central reservoir or generated by the air compressor motor flows from the level control valve unit (Y36/6) to the individual spring struts. DIY tool can be made by modifying either a or 3/8" spanner by grinding it down to fit the residual pressure holding valve. after loading). wheelhouse. Make sure that all valves are under pressure (struts and reservoir have pressure in them). Diagnostics tells me - Answered by a verified Mercedes Mechanic . Ensure the vehicle is parked on a level surface. damping force setting is available almost immediately if sudden changes The Facelift W220 will suffer from less rust than the early S Classes. Location Romania , Braila Your Mercedes W220 Jun 13, 2022 #21 Nobody here deals with this model. Miessler Automotive sells new struts having the same features as the OEM. diagonally opposite in the casing. piston. required when changing a wheel or for repair work (hoist) for Mercedes Air Suspension Reset - DIY or the Task for Professionals? The vehicle level is raised/lowered by increasing/reducing the air pressure in the air chamber (l), This method uses clever electronic components to "trick" the W220 computers into sensing that an AIRmatic is actually installed so that error messages are not displayed. Use a small screw driver to lever the disc out. While at it, don't forget to replace air dryer desiccant (silica gel) and dust filter. WARNING: Travelling long distances or over excessively bumpy roads with this temporary fix using a block of wood will damage the Transverse Control Arm Top (Upper Control Arm (UCA)). All other valves (in valve block) are closed. When the vehicle is Old one had a noise like - Answered by a verified Mercedes Mechanic . This helps with reassembly to ensure the larger solenoid o-rings do not get damaged or misaligned when putting back together. Use the divider still set to a radius of 61.5mm and mark six arcs around the circumference of the PCD. The suspension tuning is set according to: The following suspension styles are available: The selected suspension style is stored in memory, even after the SmartKey is removed from the starter switch. The M-B 5 ft lengths are just for repairs, so connectors will be needed. The piston ring within the compressor unit of your air suspension system deteriorates over time. I replaced the rear level sensor because it showed a code saying it was faulty, I assumed that's why the rear end wouldn't raise up properly. Then pull it smoothly and evenly downwards and press onto the support bearing. 1 minute). The air released when the vehicle is lowered is returned to the air filter/cleaner via the line (g) where it is then guided back out through the filter. Doing this will help ensure a nice snug fit when putting back together. Link for rear level sensor A2203200032 (EUR 40). Unfortunately the valve block can not be dismantled for inspection and cleaning thus a new Level Control Valve Unit (Y36/6) was required. (The vehicle must be in the ready to drive mode when torquing this bolt. protective diaphragm (k) and a silicone oil layer (i). Cheap Chinese clones made of plastic are available on Aliexpress, but in our experience they started to leak in less than a year of operation and the lifetime of the pressure sensor is around two years. This is installed in the AIRmatic Compressor Unit (A9/1). The electric compressor generates the pressure required to lift the vehicle. If the level sensor reports wrong height the system will think that vehicle already has the required level and will not raise the vehicle. It is possible that the pressure line to the strut develops cracks or micro cracks. 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. Unscrew pressure line connection (1) from AIRmatic compressor unit (A9/1). 2-piston reed valve packs (p). The Level Sensors consist of two Hall Effect sensors in a single housing which produce two signals (redundant design). As soon as the required vehicle level is reached at a front wheel, the respective level valve (y1 or y2) closes, the other valve still remains open until the same vehicle level has also been adjusted at the other wheel. Remove engine compartment paneling (right front part only). reed valve pack (p). To be thorough, an objective test is best performed. X62/6 - Right front axle multiple circuit junction connector, major assembly compartment, X62/7 - Left front axle multiple circuit junction connector, major assembly compartment, Empty suspension strut (40) affected using. Possible consequences of riding with leaky strut: There is a temporary fix for front struts, which can be used to get to the closest workshop: The ride will be little bumpy, but not much harsher than it is when pushing the button that stiffens the suspension. The AIRmatic pressure sensor (B7) is located on the end face of the valve unit. You may need to use a vice carefully to press the solenoid block and metal block back together. (The vehicle must be in the ready to drive mode when torquing this bolt. This would be an invaluable aid to another Forum member sometime in the future. BILSTEIN OE Replacement (Air) Mercedes Benz W220 4matic The strut itself has a residual pressure holding valve which is designed to stop air escaping out of the strut once the internal pressure drops below a residual pressure of 4-5 bar. It won't take much longer but will last longer and work just as well as a desiccant. It measures the system pressure and is used to carry out plausibility checks. 1.inspect the level sensors first *Inspect the front level sensors. Wabco air suspension compressor piston ring repair. Since Bilstein is OE manufacturer for W220 AIRmatic struts, it is possible to buy OE struts directly from Bilstein much cheaper. If the solenoid valve coils (y1, y2) are not actuated, the spring-loaded Remove bolted connection (1) of thrust arm (4) on rear axle carrier. If you have diagnosed a leak in any of the AIRmatic pneumatic lines, the repair options are to: The air lines to the rear struts go through the interior and it may be difficult to find the leak unless the crack is large enough so that the crack can be located thanks to a loud hissing sound. In this case the pressure will be released back to air compressor and out of the system. See Level calibration, read the disclaimer, then F2 in order to actuate the level valves. It keeps the vehicle level constant when the Pressure can also be supplied from the compressor and The "Development data" menu (in German) can be used to force damping setting for all struts (F3 - the hardest setting, F6 - the softest setting). 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. example. Install the strut tube (a) into the air bag/bladder and secure with the 2nd crimp ring. The valve block has a valve for each strut supply pipe and if the valves remain closed then no air will leak from the other struts whilst one strut is off. transmitted to the actual sensor element (h) by means of a metal After the 120 elapsed time the final compressor pressure ('P' line) = 10.8431 bar. Leak test between compressor and valve block (line between compressor and 'P' port in valve block). Remove the complete air spring from the damper unit. On this screen observe the voltages which correspond to the height of the vehicle. solenoid valve for each wheel (y1, y2, y3 and y4) for raising or lowering the vehicle. Metal compressed air reservoir. Warning messages in multi-function display if vehicle is too low. Check cup seal of ball joint in spring control arm (17) for damage. Open SDS Mercedes Suspension Ride Height Level Sensor - YOUCANIC The pressure (b) is level at the front axle is recorded by two level sensors at the front Manual and automatic level adjustments are no longer possible. Slowly lower vehicle and make sure that the torsion bar (77) makes contact with the It is possible to get 10% discount [1] when making an order online. There are also compressor repair kits that include new cylinder head. module from the level sensors when loading the vehicle. Excellent replacement tutorials for the front and rear struts are available here: See Section Airmatic Adjusting Levels Using DAS. If the level sensor reports wrong height the system will think that vehicle level is too low and will rise the vehicle above normal height. Check that the car is on the ground and the vehicle is fully supported on the new strut. For the relay and fuse locations see above. Reattach C-pillar. Various messages concerning the AIRmatic and ADS are shown in the multifunction display in the instrument cluster and in the comfort and sport and level adjustment switches. For a leaking residual pressure holding valve (k) to cause a full deflation, the air supply line or the relevant valve in the Level Control Valve Unit (Y36/6) would also need to be leaking. door contact switches or trunk illumination switch in order to check the current The roll-up zone on the air spring strut is sealed off from the outside by a rubber protective boot or bellows (n) as a protection against dirt. After the 120 elapsed time the final compressor pressure ('P' line) = 5.30 bar. 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. Daimler Group Mercedes-Benz, Smart Discussions. The raised level switch position is indicated by the red indicator lamp (1) in the switch. 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. Use a dielectric grease sparingly on the o-rings. The main control parameters are the pressure in the main reservoir, the outside air pressure and the vehicle speed. Depending on the situation, pressure can be generated by the Bypass the complete air line with an aftermarket high pressure flexible nylon pneumatic line. The newer seals have rubber mastic compound poured in the center to seal the circumference of the upper metal cap on the upper part of the front strut and to keep the brass fitting from breaking off. which results in a lengthening/shortening of the air spring strut (40). ), Use an air impact driver to undo the lock nut on the top of the damper piston rod (e). Plug the pressure line for the duration of the repair operations, Pull off grommet and disconnect electrical connector of damping valve unit (Y53x1/ Y54x1). Note in the example the operator is in the car with a friend in the back seat, so that is why Rear axle level sensor is at 3.27V, it should not exceed 3.0V. *Inspect the level sensor at the rear torsion bar. The level is adjusted to +/- 10 mm every 15 minutes. when checking the vehicle level but not for side of the vehicle calibration. With this information, you can make informed decisions about repairs and maintenance, saving time and money. The Definitive Guide To The Mercedes-Benz AIRMATIC Suspension System Unscrew nut (85d) of control rod (85) at level sensor (B22/3) and remove control rod (85). 10 See Actuation of level valves and observe level sensor voltages. Fortunately, it is possible to purchase on eBay a refurbished 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). The moisture is delivered back After "ignition OFF" the control module performs changes in the It is difficult to get reliable information about the scheduled maintenance interval on the AIRmatic air filter. limp-home buffer (1b). Use a high temperature silicon grease such as Permatex 22058 Dielectric Tune-Up Grease to lubricate high pressure pipes, threads and O-rings. Connectors of damping valve unit and rpm sensor. Gas pressurized damper or single-tube gas-filled shock absorber. With the downward movement of the piston, the air passes Detach the connector of 'P' port and spray the port with leak detection spray. valve unit until the vehicle level has been adjusted. The Allen head Stub Screws holding the bottom of the front strut use Loctite thread fastener so a little heat from a gas torch always does the trick in breaking the sealant. If the vehicle is low, but there is no red error message in the instrument cluster Common Problems W220 S Class - Mercedes Enthusiasts The leak can come also from the body of the valve block (valve block is glued together from two parts). The damping force levels are achieved by The rear end will raise when hitting the raise button, but it's still not enough, and no where near level. Remove spring strut (40) downwards towards the side. If the leak is severe, a hissing sound can be heard from the wheel house area. An airmatic pump will require calibration with the star machine once fitted. 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. Thus the fault was a leak in the valve block. How To Release The Air From A Mercedes-Benz AIRMATIC Air-Strut - FCP Euro However BE WARNED, the vehicle may leak enough to be not drivable when turning the front wheels causes them to touch the top of the wheel arch (for 18" wheels and larger). If possible depressurise the AIRmatic system using STAR DAS. For a W220 typical angles are +3.5 degrees for the front and -1.9 degrees for the rear.) There are two level sensors (B22/3, B22/8) for each front wheel and one for the rear axle (B22/9). air to be compressed is sucked out of the vehicle longitudinal After the compressor was turned off the initial compressor pressure ('P' line) = 10.8431 bar. SDS reported that there was a leakage in the valve block or the high pressure line between the compressor and the valve block ('P' port). W220 S Class Suspension Issues Explained(+Most Common Problems) The raising sequence will then take an unusually long time. The vehicle chassis ride height is raised or lowered according to the selected level setting and to the vehicle speed Accurately mark up the steel plate as per the figure above which shows the mark-up dimensions for the DIY AIRmatic front strut top seal remover tool. (Note: a new nylon plug is available with part number TBD. As a comparison, after replacing the Level Control Valve Unit (Y36/6) or Valve Block with a BRAND NEW OEM part, the following result was obtained for a leak test. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. You have to go to Initial startup mode in SDS. The other parts are the pressure relief valve, overpressure/residual pressure valve (b) and the air drier (c). Can be tested by supplying 12v voltage to the pins of electrical connector. I get AIRMATIC malfunction when I start the car. It is a complicated process that takes time. Link (rod) for front left/right level sensor A2203200389 (EUR 28), Sensor bracket front left - A2203270840 (EUR 70), Sensor bracket front right - A2203270940 (EUR 70). This requires the Strut to be removed from the car and the Air Spring to be separated from the Damper unit by partly dismantling the Air Spring. Could be caused by faulty solenoid valve in the strut in which case the strut or strut's damping valve unit should be replaced. Inspect the wet connection as the bubbles caused by a cracked O-ring can be small and may develop very slowly. Remove bolted connection (2) of suspension strut (41) on spring control arm (72) using 21mm socket from both sides. Remove the epoxy/mastic using a hammer and a screw driver. This requires access to an hydraulic crimper, which is not easily available for a DIYer. 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). Before reseting AIRmatic suspension, check that the problem isn't with the height adjustment lever. Obtain three off 120mm long 8mm bolts for the three 8mm holes. It is possible to purchase a brand new Bilstein strut for about EUR 700. When one sensor is faulty, the airmatic system will try to level the vehicle, leading to . Remove bolts (40c) from spring strut (40). Support the car on stands. The image below shows a typical worn upper mount rubber bushing removed from an AIRmatic air suspension strut with around 80,000 to 100,000 miles (130,000KM to 161,000Km). The damper valves for ADS are no longer controlled and remain set to the "hard" damping level (driving safety level). If an axle is too low, cycling takes place between the left and right level valve. It is common to misdiagnose leaking valve block or line to the strut with leaking strut. Installation: When installing tighten the upper nuts (40b) first. This page was last edited on 8 April 2023, at 00:48. With decreasing speed, the ride height is again raised to the selected vehicle level. The red circle shows the threaded brass air inlet to the Air Spring. vehicle level for critical conditions (level too low) and if necessary to raise Failure to detect the damaged O-ring in the next figure cost the author two new rear struts as it was the O-ring slowly leaking and NOT one of the struts as was mistakenly diagnosed. This also cleans the air filter/cleaner. This is essential, for example, when changing a wheel or during repair work (lifting platform).
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