For maximum longevity dry it at just 80C. If you performed any suspension repair ensure that the level sensor at the front airmatic strut is not installed backward. $17.99. Look at the sensor setup and make certain that nothing is loose, bent, or misplaced. At the same time the level valves of the individual wheels remain open until the desired vehicle level is reached at each front wheel and at the rear axle. member through an air filter/cleaner and into the chamber underneath the I didn't move it, that's where it was when I got it, is that a normal position for it? Arnott sells both new and remanufactured AIRmatic struts. 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. The residual pressure in the strut will prevent the bolt from being removed. After the compressor was turned off the initial compressor pressure ('P' line) = 10.8431 bar. Note: the same symptoms as a leaking strut can be experienced if the line to the strut is faulty or the valve block is faulty (see section "Level Control Valve Unit Leaking" and "Inspecting AIRmatic Level Control Valve Unit (Y36/6) for leaks"), so be sure to eliminate these causes before replacing a strut. solenoid valve pistons (y1, y2) keep the holes directly below them closed. The pressure (b) is particular front wheel or rear axle until the vehicle has reached its specified value. The M-B 5 ft lengths are just for repairs, so connectors will be needed. This also cleans the air filter/cleaner. Disconnect left front axle multiple circuit junction connector, major assembly compartment (X62/7) right front axle multiple circuit junction connector, major assembly compartment (X62/6). For example, the Mercedes-Benz S-Class W220 has an air compressor relay and fuse 32 on the fuse box on the passenger side of the engine compartment. By actuating solenoid valves air is delivered to the spring struts of the 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. Leak test between compressor and valve block (line between compressor and 'P' port in valve block). A simple test is to run an alternative line from the valve block to the strut to check if the original line is faulty (see the section on the line repair). The replacement of piston ring will not help if the cylinder head is damaged/worn. You may need to use a vice carefully to press the solenoid block and metal block back together. Visually check that the centre pop marks match the pitch circle diameter (pcd) of the strut top plate mounting bolts. Also, the front end only seems to sit at a decent level in raised mode. As an example, the following result was obtained for a leak test for a FAULTY 'P' line to Level Control Valve Unit (Y36/6) or Valve Block. Low aerodynamic drag and fuel consumption as vehicle lowers above 70KPH. STAR Diagnosis System (SDS) or Diagnosis Assistance System (DAS), https://w220.wiki/index.php?title=Airmatic_Adjusting_Levels_Using_DAS&oldid=7145. Tighten the central nut to the plate from the inside and this will wind down the bolt pushing the Air Spring top metal disc inwards slightly releasing the snap ring. Each strut has an air spring containing an air bag (bladder) and a dampener built-in to the one unit. The AIRmatic Level Control Valve Unit (Y36/6) is attached to the same If it is not running, check AIRmatic Fuse and relay (see above). After the 120 elapsed time the final compressor pressure ('P' line) = 10.8431 bar. Jan 9, 2010 (Edited) Hi All I have had my S500 W220 2000 for about three months and overall I am pleased with its performance except for an annoying vibration. the risk of corrosion as the original. Check cup seal of ball joint in spring control arm (17) for damage. Oxidation layer can be cleaned with some reagent. 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. Unscrew nut (86b) on connecting rod (86) from upper wishbone (6) and remove connecting rod (86). They do not necessarily need to be exchanged for a new suspension strut. 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. The compressor will run endlessly which may cause compressor burnout. The Facelift W220 will suffer from less rust than the early S Classes. NewYall Front & Rear Suspension Height Level Sensor. The vehicle therefore remains at the current level. The compressor relay is powered by 40A fuse 32 located in the right fuse box. Possible to clean the oxidation layer and reattach the halves. Located above are the spring-loaded A piece of masking tape over the holes is a short term solution. There are two level sensors (B22/3, B22/8) for each front wheel and one for the rear axle (B22/9). Usually instrument cluster will show malfunction and AIRmatic control unit will report an error: There are two level sensors for each front wheel and one for the rear axle. Chinese plastic clone (60 USD on Aliexpress). I doubt it needs Calibration if the Voltages are close, unless some inept previous has fiddled with it and guessed at Romess Figures. Note this method was published by MB World Fanatic aleksandar1099 ([1]) and refers to a W211 but equally applies to W220 models. The plunger mates to the "support bushing/bearing" which is the conical shaped seat on the damper unit. If the solenoid valve coils (y1, y2) are not actuated, the spring-loaded in which case the vehicle is equipped with Active Body Control (ABC) hydraulic suspension system with additional computer control. This is installed in the AIRmatic Compressor Unit (A9/1). The impact wrench shocks the nut undone.). You already have adjustable links which ppl spend lots of money to buy , why dont you just adjust them to get your car level ? Note the Upper Mount Rubber Bushing can be replaced without removing the strut for the car. (Ensure the car remains "asleep" during this time.). If the vehicle is low, but there is no red error message in the instrument cluster Pictures, and data, were all taken while it is in raised mode. 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. Detach connector on AIRmatic pressure reduction valve (A9/1y1). A common fault is rust on the link of the rear level sensor. Leak test between compressor and valve block (line between compressor and 'P' port in valve block). This requires access to an hydraulic crimper, which is not easily available for a DIYer. 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. Gas pressurized damper or single-tube gas-filled shock absorber. The yellow arrow points to the hole going through the upper mount rubber bush for the damper piston rod (e). Cut out the failed section and reconnect using an in-line joiner. (The vehicle must be in the ready to drive mode when torquing this bolt. the vehicle or lower it when unloading. The Airmatic Compressor Relay (K40/7kO) is located in right fuse box, location 'O' (the first one next to the three 40 amp fuses). 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. 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. Make sure to order spare bolts with the kit and be prepared to drill out the old remains. 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). The display disappears again when the level has risen back to 48 mm or 58 mm (58 mm or 68 mm USA) respectively below the normal level. Install the strut tube (a) into the air bag/bladder and secure with the 2nd crimp ring. For a better experience, please enable JavaScript in your browser before proceeding. After using the repair kit proceed as described above when filling the air suspension strut (picture 2 and 3) ie pull the air spring plunger (7) firmly downwards by hand so that the air does not escape between the air spring plunger and the support bearing. Before replacing a supposed leaky AIRmatic strut, always carry out a leak test on the head bearing using soapy water. with a reference pressure (g) in the sensor. Oct 31, 2020 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. Connectors of damping valve unit and rpm sensor. The only sliding action is in the strut damper unit which is oil filled and gas pressurized. However, for the longevity of our vehicles, it is recommended to change the desiccant along with the air filter at some point. Note: The epoxy is not the seal for the upper strut. From A professional repair costs around US$550 parts and labor for both sides. Once the suspension strut is filled, carry out the leak test on the head bearing and repair if necessary. Remove the epoxy/mastic using a hammer and a screw driver. For a W220 typical angles are +3.5 degrees for the front and -1.9 degrees for the rear.) 10 See Actuation of level valves and observe level sensor voltages. An airmatic pump will require calibration with the star machine once fitted. Three possible damping levels for comfort, sport or extreme sport driving styles in vehicles produced after 09/99. C. See Main Groups, highlight Functions performed by more than one control unit, F3, D. See Function main groups, highlight Chassis / Chassis, F3, E. See Chassis / Chassis, highlight Brake System, F3, F. See Brake System, highlight Chassis level adjustment, F3, G. See List of all control modules, highlight Suspension, F3, H. See AIRmatic, highlight Control unit adaptations. The fault is stored in the ADS suspension control module and can be read out using the diagnosis tool. Conclusion: This real world Central Reservoir and its associated supply line after 220,000Km produced a leakage rate of 0.27 bar in 120 secs, which is well within the specified 0.5 bar in 120 secs. In addition the pressure relief valve is opened to actuate the respective wheel valve when unloading the vehicle. The vehicle level is raised/lowered by increasing/reducing the air pressure in the air chamber (l), 1. An electronics module (a) which supplies the pressure signal in the Used to remove and install the brass residual pressure holding valves at each of the air inlets to the front air suspension struts. Install bolted connection (2) of suspension strut (41) on spring control arm (72). If the vehicle level is lowered by more than 30 mm, it is raised to the normal level at the front axle is recorded by two level sensors at the front Calculation of body vertical acceleration, Calculation of longitudinal and lateral acceleration, Outside temperature, outside air pressure signal, Level signal from left front axle, right front axle, Calculation for control of main reservoir charge valve, Signal from door contact switch, trunk, remote control. It didn't work. If the compressor unit is not able to provide pressure, the most common fault is worn piston ring or cylinder head inside the air compressor. suspension system. 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. this hole. The AIRmatic central reservoir charge (y5) is also installed in the valve unit. When the driver presses the brake pedal, a signal is received by the ADS logic component and the damping at all wheels is set to "hard". Information reported by level sensors can be viewed using DAS. 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). Remove the top seal metal disc cover with its 'O' ring. For an AIRmatic strut to deflate completely there may be a catastrophic failure of some internal component such as the air bag/bladder (h), but it can also mean that the residual pressure holding valve (k) is leaking so that the strut deflates over time. Nut. The lower flared conical part of the air spring protective boot/bellows (n) is the "air spring plunger". 2010 S550 4matic many years ago had Airmatic control module replaced and leveled. valve unit until the vehicle level has been adjusted. closes and the air is compressed. Oil is displaced via the reed valve packs (p) and the oil duct located Replaced rear right strut. While driving the level is readjusted if there is a difference of more After 120 secs elapsed time the Central Reservoir pressure = 7.41177 bar. A side note; pressure has basically nothing to do with height (as far strut is on its free moving range, not in the hard stop end). This page was last edited on 6 April 2018, at 14:27. The following vehicle level settings can be selected when the vehicle is stationary: Select the "Raised" level setting only when required by current driving conditions. From the factory, the air line is built using a continuous length of line with no joins. Disconnect connector for air compressor motor (3). Inspect the wet connection as the bubbles caused by a cracked O-ring can be small and may develop very slowly. In compressor or the pressure supply of the AIRmatic central O. 1.inspect the level sensors first *Inspect the front level sensors. 9 Select F3 and Read the disclaimer, then select F2. Various colours are available and can be used to match the OEM colour code. Pressure sensor is part of the valve block, but in case of a pressure sensor failure, the pressure sensor can be unscrewed (using 27mm wrench) from the valve block and replaced separately. In the event of electrical faults in the AIRmatic or ADS system, the following message appears on the multifunction display in the instrument cluster: "AIRMATIC VISIT WORKSHOP!". The leak can come also from the body of the valve block (valve block is glued together from two parts). For the relay and fuse locations see above. Vehicle level displayed by indicator lamps and switches. Stores compressed air for level control. Higher level of driving safety and ride comfort due to: The functions of the AIRmatic with Adaptive Damping System (ADS) control module are divided as follows: The following input signals are processed by the function logic component and used for calculations or to provide information: The conditioned input signals are processed in the logic component and converted into output signals. The struts get air via a valve distribution unit from an air compressor located behind the front bumper close to the front right wheel well. This would be an invaluable aid to another Forum member sometime in the future. *Inspect the level sensor at the rear torsion bar. the vehicle should be stopped immediately and measures taken. If an axle is too low, cycling takes place between the left and right level valve. You have to go to Initial startup mode in SDS. Highlight W220, F3 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. atmosphere. Unscrew nut (85d) of control rod (85) at level sensor (B22/3) and remove control rod (85). In this case replacement line or a repair joiner can be used. Without air and under load the protective boot or bellows is allowed to kink and crease and the air bag or bladder would also have the top pressed hard into the inside of the air chamber (l). And just like that, your airbags are ready for removal or installation. Check the electronic connection between the strut and AIRmatic with ADS control module (N51). They are not especially problematic, but like any complex system, they break - and any luxury car is expensive to repair. Detach air compressor relay (K40/7kO). Impact driver (Note: is absolutely essential for removing the nut at the top of the damper unit.). It is possible to get 10% discount [1] when making an order online. Obtain one off 150mm long 10mm bolt for the center 10mm hole. The W220 AIRmatic system is a fully supporting air suspension system which provides both static and dynamic support by means of four air struts located at the wheels. At the same time air solenoid valve for each wheel (y1, y2, y3 and y4) for raising or lowering the vehicle. Airmatic Suspension - As with other airmatic suspension, check for leaks before buying the new pump. Hella relays have proven to be reliable. Link for rear level sensor A2203200032 (EUR 40). in the valve unit and a pressure relief valve on the AIRmatic compressor unit. wheelhouse. 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. Mercedes W220 S Class AIRMatic Level Calibration Mercedes ML W164 Steering Wheel Angle Sensor In this post I am dealing with the ML W164 and an steering wheel angle sensor readings after steering rack exchange. The "Sport 2" setting immediately sets the damping force to "hard". Compressor keeps the line to 'P' port (in valve block) closed. The pressure relief valve installed in the compressor unit (y1) is Support the car on stands. The "Sport 1" setting makes the damping somewhat "harder". 487 - ABC SUSPENSION (ACTIVE BODY CONTROL) Raising vehicle level for poor road surfaces and when negotiating driveways. If this valve is stuck, the air will not be released out of system even if ECU sends the electrical signal to release valve built in the compressor unit. 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)). The site includes MB Forums, News, Galleries, Publications, Classifieds, Events and much more! 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. We have achieved good success using Alca 227000 2-Cylinder 12v compressor. Wait for approx. Ok, I would suggest you get the car connected to the Mercedes Star Diagnosis tester to perform a ride height calibration and see if that gets rid of the code. The compressor is controlled via a relay. You'd have to do the same thing with standard shocks, too - but Airmatic will be more expensive. This means that minor leaks can be recognized (forming a white cap). Electronic level control which maintains a constant even level at the front and rear axles according to the driving and vehicle load conditions. When Airmatic ECU decides to lower the vehicle, the corresponding valve in the valve block is opened to release the air out of the system. This technique removes variations caused by tyre pressures. The seals at the tops of the front suspension struts develop leaks. 6 - Transverse Control Arm Top (Upper Control Arm (UCA)), Depressurise AIRmatic components (suspension struts, valve unit, reservoir unit) before removal using STAR Diagnosis. The raised level switch position is indicated by the red indicator lamp (1) in the switch. When the vehicle is stationary the level is readjusted if there is a 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). Daimler Group Mercedes-Benz, Smart Discussions. example. 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. Pull intake hose with air filter (2) out of longitudinal member. Especially when they realize it could be faulty wiring. The extremely short adjusting time (milliseconds) means that the optimum Jack up one side of the car as required. 1 minute). 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. When reinstalling a strut ensure that the plug at the electrical connection is pressed home firmly. The vehicle therefore remains at the current level. Front wheel speed signal, left and right: Using the wheel speed signal, the ESP control module calculates. Leak test between valve block and central reservoir. This residual pressure holding valve (k) normally blocks off the pressure chamber in the air spring from the supply line and closes at or below a residual pressure of 4-5 bar. After around 100,000 miles (130,000Kms) they often show signs of cracking and tearing. Paint or spray the pressure line connections 1, 2, 3, 4, 5, P of the level control valve with leak detecting solution. (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. This requires both sides to be replaced as a minimum, and possibly all four wheels should be done together.
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