Mercedes Benz Company launched a new generation of S,SL,CL class cars in 1998 adopted brand new Airmatic replaced the traditional steel spring and hydraulic suspension system. This system has a lot of advantages comparing to the traditional steel spring suspension. Such as, high-speed driving or suspension can harden when turning,ride height can lower 15 millimeter, so as to increase vehicle control stability and aerodynamic performance; And when vehicle driving on bumpy road at low speed,control unit can sense via rough road sensor so that improve riding comfortableness through softening suspension. Due to connection with chassis and body, suspension system bear stress like companding, cutting(acceleration, deceleration),torsion etc., which result in very frequent faults of this system. Now make a brief narration about methods and techniques of using Fcar vehicle code reader. to diagnose, detect and adjust Benz Airmatic. In usage of Fcar Mercedes code reader to diagnose vehicles, most customers are very familiar with read DTC, clear DTC and read data stream, yet very few users use DTC help and are familiar with matching of Benz vehicles. From DTC read out from air suspension system, at this moment, only need to step a little forward: Click ”Help” button, then make a big step in vehicle repairing: Obtaining the maintenance method for this fault, here indicates the reason for this fault and involved related components, and method and steps of inspecting and removing faults. If combining with manual inspection and actuation test, then it can detect the actuation of related component normal or not.
"ABC Active Body Control" in actuation test item also includes function of discharging air mixed into hydraulic system (replacing the hydraulic system catheter or rubber telescopic tube often mixed with air, causing the hydraulic pressure not high enough, the air pump inflation abnormal. To perform the actuation test, firstly need to relieve system pressure, and then gradually increase the pressure under high idle speed, until the pressure reaches a predetermined value. )When replacing level sensor, control module, air pump in air suspension system or vehicle levelness error, need to perform level calibration. If there is no special gradient tester, you can place vehicle on level ground and use tape with precision of 1mm to measure.
Select “Horizontal calibration” in Controller code” menu to carry out related operation.After select “2 Horizontal calibration”, there are a series of buttons of F3―F10 for adjusting ride height in this matching. The corresponding position of the vehicle will lower or raise 0.5/2 millimeter (depends on suspension system setting height) for every click. During adjustment, need to insure the value of four sensors: B22/7,B22/8,B22/9,B22/10 between 2―3V,otherwise adjustment failed. When current left, front right, rear left, rear right meet requirements, access to the most critical step of matching: write related data into suspension computer, click F2 key, when the user write down the recommended front and rear axles of the corresponding models (such as the S series select 4.8 and -1.9), and click OK button, then enter interface that required to input this value. In actual input, Fcar Mercedes code reader will inquire four inputs: front left, front right, rear left , rear right, in order to maintain vehicle at level state, the first two values (ie front left and right) must be the same (S series are 4.8,4.8), the last two values (ie rear left and rear right) must be the same (S series are -1.9, -1.9). In input process, once input error value, Fcar car code reader will be prompt that input value illegal, and exit level calibration procedure. If success, then shows “Horizontal calibration success."
The new generation of Mercedes-Benz air suspension system (Airmatic DC), Not only had a significant progress in electronic control, but also integrated active control and adaptive air suspension system damping suspension system (ADS Ⅱ) together to achieve Dual Control, further enhanced comfort and improved control performance.

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