The transmission automatically processed
| Total information |
| Type || 5-speed, automatic, electronically controlled gear change |
| Designation |
- Models 163.113 (ML 270 CDI)
| 722,661 |
- The models 163.128 / 174/175 (ML 400 CDI, 55 AMG and 500)
| 722,666 |
| 722,660 |
| 722,662 |
| 722,674 |
| 722,663 |
| The type and amount of ATF || See. Specifications to the Head Current leaving and service. |
| Diagnostic Codes system electronically controlled automatic transmission, see. Chapter Systems of an electric motor. |
| Gear ratios and the scheme of operation of activators AT 722.6 |
R (Mode S)
R (W mode)
* Activators switch kickdown mode only
| Diagnostic Codes system electronically controlled automatic transmission, extractable via OBD II Scanner |
Refer to the Specifications to the Head System of an electric motor.
| Efforts of a tightening of carving connections, Nanometer |
| Bolt head shift rod || 12 |
| Drain plug oil pan Transmission || 20 |
| Bolts pan to the crankcase || 8 |
| Bolts thermofilter to the transmission housing || 8 |
| Bolts electrohydraulic control unit to the transmission housing || 8 |
| Bolts selector lever assembly to the floor panel || 6 |
At the time of pulling away the automatic transmission (AT) is acting as an ordinary clutch and during movement performs work on the gearshift lever. All covered in this manual model set AT series 722.6.
The main units of the AT are the torque converter (torque converter), the planetary gear unit and a hydraulic or electronic control unit. To move to a different gear ratio in the planetary gear unit are applied by hydraulic disc brakes and clutch disk. The design of a typical AT shown.
The design of a typical AT
Torque converter on the functions corresponds to hydraulic clutch. Its task is the implementation of the clutch when starting and changing gears.
Transmission control system (also known as electronic synchronous shift) is part of a modified engine management system is installed only on models with the AT. The control system can operate in a special emergency (safe) mode with a limited range of switching, which switches when it detects a fault (on the instrument panel will activate the warning lamp (see chap. Controls and receptions of safe operation). Switch to emergency mode allows drive away the car on their own a workshop to perform detailed diagnostics and necessary reconditioning. Based on the analysis of data from various information gauges (not necessarily directly related to the operation of the actual transmission), transmission control module (TCM) selects the optimum in terms of cost , smooth shifting and so on. AT mode of operation. At a certain throttle position TCM can issue a command to lock the torque converter that control switching AT range only 4th and 5th gear, which contributes to a significant reduction in fuel consumption.
AT only maintenance procedure, the implementation of which should be done on a regular basis, is to check the level of the working fluid (ATF), the order of execution which is set out in Chapter Current leaving and service. The need for regular replacement ATF is missing.
Next to the cooling radiator installed cooler ATF.
Based on data from the traditionally installed under the gas pedal sensor-switch activating the kickdown, TCM is to switch to an adjacent transmission currently used gear at full squeezing of a pedal that can significantly improve the dynamic characteristics of the car, such as when overtaking.
There are several modes of transmission, each of which may be operated after moving the selector to one of the following positions: "P", "R", "N", "D", "1", "2", "3", " 4 "(see Chapter Controls and receptions of safe operation). Starting with 1.9.99 on all models began to be fitted with electronic modules with the function selector sequentially selecting driving mode ranges ?«D?» (1, 2, 3 and 4), when a transfer of the AT mode switching range limit (4, 3, 2 and 1) side arm push-ups performed (D + / D-) (see. Section Start movement and shift).
By using a special gauge-switch N / P to start the engine can be carried out only when the selector AT lever is in the "P" or ?«N?», which helps prevent accidental pulling away when you try to start the car.
In this chapter only the most common maintenance procedures AT lying within qualification of the average mechanic-fan. For more information on the design, operation and maintenance of the principles of AT 722.6 series can be found in the Guidelines ?„–179 (?«Automatic transmissions of modern cars") and ?„–187 (?«Mercedes C-Class W-203"), the publishing house "ARUS."