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2.5.1. Start of motion and switching of automatic transmission

Start of motion and switching of automatic transmission

General information

In a driver's foot well there should be no foreign objects capable to limit freedom of movement of pedals! When using emergency rugs or mats it is necessary to provide the sufficient course of pedals.

Full load of the engine has to be given only after preliminary warming up it up to the normal working temperature which during the movement occurs quickly enough.

At start-off from the place on a slippery paving avoid a long provorachivaniye any of wheels as it can lead to damage of the power unit.

Start of the engine

The description of procedures of start of petrol and diesel engines is provided in the subsection Engine it is turned, but not started.

Start-off from the place

For the purpose of shutdown of blocking of the lever of the AT selector squeeze out a pedal of a foot brake.

Transfer the lever to situation "D" or "R".

You do not hurry, wait for final inclusion of transfer, - told in a special measure treats cold season.

Release the parking brake, - a control lamp on a combination of devices (see the illustration Design of a Combination of Devices).

Release a pedal of a foot brake and smoothly squeeze out gas. Remember that on petrol models at the cold engine automatic gear shifting happens at several higher than usually frequencies of rotation of a bent shaft at the expense of what process of warming up up to the normal working temperature of the catalytic converter accelerates.

At activation of the corresponding function of the on-board computer soon after start-off of the car from the place there has to be an automatic blocking of doors.

Management of switchings of the modes of 5-staged automatic transmission

Gear shifting during the movement of the car is made automatically depending on the chosen position of the lever of the AT selector, the choice of the mode of the transfer case ("N" or "L"), extents of squeezing of the accelerator pedal and the current speed of the movement.

Switchings of automatic transmission automatically adapt to an individual manner of driving, due to correction of the moments of gear shifting. Process of adaptation goes continuously taking into account the current values of working parameters of the power unit, characteristics of the movement, and also actions of the driver. Information on the transfers chosen by AT is output to the respective field of the basic page of the multipurpose display (see the illustration Scheme of an Arrangement of Fields of Indication of the Basic Page of the Multipurpose Display of the On-board Computer).

The description of procedures of start of the engine and start-off of the car from the place is provided in the previous subsections (see above).

At the movement it must be kept in mind that moderate squeezing of the accelerator pedal provides earlier switching of transmission to an overgear while by strong pressing of switching occur later.

Squeezing of the accelerator pedal to a floor (with overcoming a point of resistance) leads to automatic switching of AT to a low gear (kickdown mode), providing to the car the increased dynamic qualities. At an otpuskaniye of a pedal there is a return of transmission on the initial higher transfer answering to characteristics of the current high-speed mode.

At a temporary stop you do not bring the selector lever out of situation "D", holding the car motionless by means of the foot or parking brake.

When maneuvering in limited space regulate the speed of the movement by a gradual otpuskaniye of a foot brake. Try to squeeze out slightly the accelerator pedal and not to "play" it.

At towage of the trailer in the hilly area choose the modes of restriction of AT (3 or 2, depending on the steepness of slopes), on especially dangerous sites activate the lowering ("L") mode of the transfer case.

Provisions of the lever of the AT selector with the electronic selector module equipped with function of consecutive switching of working ranges in the D mode

At the movement on a slippery paving it is not necessary to make braking by transmission due to activation of the modes of restriction ("3", "2" or "1") as it can lead to loss of coupling of wheels with the road! Remember that braking by the engine is always connected with the sharp increase in its turns fraught with serious internal damages of the power unit.


Provisions of the lever of the selector of ranges of AT (indication of switchings is removed to the respective field of the basic page of the multipurpose display, see the Section Amplifier of Emergency Brake Application (BAS))

The lever of the selector of ranges of transmission can be in one of four fixed provisions. Start of the engine is possible only in provisions "P" or "N" of the lever. If the stop is made when AT is in the range of the movement "D", or in the N mode, then it is necessary to release completely the accelerator pedal and to squeeze out a brake pedal for reliable braking of the car.

When switching AT move the lever along the directing groove.

At extraction of a key from the ignition lock the lever of the selector is blocked in situation "P". In this case a lever conclusion from situation "P" is impossible even when squeezing a brake pedal. The description of the procedure of emergency shutdown of blocking of the lever is given below. In order to avoid breakage of AT you transfer the lever to situation "P" only after a full stop of the car.

Extraction of a key from the lock of ignition becomes possible only after transfer of the lever of the selector to situation "P" and otpuskaniye of a pedal of a foot brake.

Standard ranges

Situation "P". In this position of the lever of the selector the blocking of transmission providing additional protection of the parked car is made. Always you transfer the selector lever to situation "P" at switching off or start of the engine. To bring the lever of the selector of ranges out of situation "P", it is necessary to squeeze out a brake pedal, previously having released the accelerator pedal. Reject the selector lever to the right and bring him out of situation "P".

Situation "R". Methods of management of the lever of the selector of ranges at its transfer from situation "P" to situation "R" (Backing) are described above. (Neutral) you make turning on of the lever in situation "R" from situation "N" only after a full stop of the car, - in unsuccessful attempt, squeeze out a pedal of a foot brake and slowly transfer the lever at first back to situation "N", then to situation "R".

Situation "N". Use situation "N" (Neutral) at start of the decayed engine on the run and at short stops of the car with the working engine. If you for any reason need to depart from the car, previously transfer the lever of the selector of ranges to situation "P". At a lever conclusion squeeze out a pedal of a foot brake of situation "N".

Transfer of transmission to situation "N" during the movement is connected with risk of serious internal damages of the transmission! Use this situation only at threat of a drift of the car at the movement on a slippery paving with the disconnected antistrange system (ESP), and also in need of connection of the transfer case.

Situation "D". In this situation the lever of the selector of ranges has to be constantly at the movement of the car in normal road conditions, - automatic switching of AT between five transfers of the forward course according to changes of the high-speed mode and extent of squeezing of the accelerator pedal is provided. For sharp dispersal of the car during the work of transmission in the range of "D" squeeze out the accelerator pedal against the stop. At the same time the transmission will automatically switch to adjacent lowest transfer (kickdown mode).

If the speed of the movement is small, switching can happen on two steps down at once.

Ranges for the movement in special conditions

At the transmission included in situation "D" the possibility of its manual switching is provided in ranges for the movement in special conditions ("4", "3", "2" and "1").

Emergency shutdown of blocking of the lever of the selector in situation "P"

Easy push-up of the lever to the left ("D -") leads to transition to the adjacent lowering AT range. When keeping the lever in situation "D-" switching of transmission in range, providing optimum dynamic qualities of the car according to active current transfer is made. Information on change of ranges is output to the indicator field on the tachometer dial, to the left of the display of hours.

At push-up of the lever in situation "D-" during the movement with excessively high speed switching of the mode of transmission is blocked for the purpose of prevention of inadmissible increase in turns of the engine.

Push-up of the lever in situation "D+" leads to transition of transmission in adjacent with flowing higher range. Keeping of the lever in situation "D+" allows to carry out return to the standard D mode.

At the included lowering mode ("L") of the transfer case protection of the engine is made due to blocking of switching to higher transfers.

Situation "4". If the lever of the selector of ranges is included in the provision "4", the automatic transmission functions similar to a case of inclusion of range of "D". Difference consists that transition to the fifth transfer is excluded.

Situation "3". In set the provision in motion of switching of transmission is limited to the third transfer. The mode can be used for braking implementation by the engine. Inclusion of range "3" is useful also for an exception of excess cyclic switchings of automatic transmission between the third and fourth transfers, - similar cyclic switchings of the transmission can be observed, for example, at the movement in a dense transport stream with frequent delays and stops.

Situation "2". At inclusion of range "2" automatic transmission will constantly work at the second transfer. It is recommended to use this restriction at towage of the trailer in the hilly area or for braking implementation by the engine on descent of the considerable steepness. At a car stop the transmission does not pass to the first transfer. Constant inclusion of the second transfer provides good traction dynamics of the car on rises and a possibility of intensive braking with the engine on abrupt descents. Range "2" can be used also at start-off from the place on a slippery paving, or at the movement on deep snow, helping to prevent strong pro-slipping of driving wheels of the car. It is recommended to use range "2" at the movement on abrupt passes, at towage of the trailer in the hilly area, and also for braking by the engine on especially abrupt descents.

Situation "1". At inclusion of range "1" automatic transmission will constantly work at the first transfer. If inclusion of range "1" is made at a speed more than 50 km/h, then transmission at first will switch to the second transfer. Inclusion of an intermediate step allows to exclude sharp and unexpected braking by the engine. The mode can be used at the movement with the trailer on especially abrupt descents and long passes.

Emergency shutdowns of blocking of the lever of the selector in situation "P"

Need for shutdown of blocking of the lever of the AT selector for situation "P" arises in case of breakage of the fixing mechanism, and also when it is required to tow off the faulty car.

Shutdown can be made by means of a usual ball pen or any other subject of a suitable form. Having wrung out a cap, enter a pen into an opening under the panel of the indicator of switchings of the selector and, having pressed it down, bring the lever out of parking situation. Take a pen.

For return to the place of a cap slightly push the lever in the direction of situation "D".

Emergency operation

Transition of transmission to emergency operation of functioning is demonstrated by deterioration in dynamic characteristics of the car and refusal of transmission of switchings. The probability of switching to the 2nd transfer or transfer of a backing is not excluded.

In a similar situation it is necessary to stop the movement, to park in the safe place, to transfer the selector lever to situation "P" and to kill the engine.

Having waited for not less than 10 seconds, again start the engine and transfer the selector lever to situation "D", - the 2nd transfer will join. Transfer of the lever to situation "R" leads to inclusion of transfer of a backing.

The car should be driven away immediately on the nearest car repair shop Mercedes-Benz for performing detailed diagnostics of AT and performance of necessary recovery repair.