Technical data

13
7
Functions
Sequential M gearbox SMG 3
Special functions
Tow-start
The following procedure must be
implemented to activate this function:
• With the brake pedal depressed, turn the
ignition key to terminal 15
• Select position "N"
• Tow-start/pus-start the vehicle
• Shift selector lever to "S+" and hold in this
position.
The transmission control engages the gear
corresponding to the speed and activates the
clutch.
Hill ascent assistant
Compared to the SMG 2, the hill ascent
assistant function has now been automated.
This means the hill ascent assistant no longer
needs to be selected manually with the minus
shift paddle on the steering wheel and the
brake depressed as was the case with the
SMG 2 but it is now activated automatically
when the transmission system recognizes any
other position than "N".
The hill ascent assistant in the SMG 3 is now
an active system that makes use of the DSC to
control the vehicle via the wheel brakes on
uphill/downhill gradients (clutch load
reduction).
3 Further information on the hill ascent
assistant can be found in the Participant's
Manual "DSC MK60E5". 1
Launch control
The following procedure must be
implemented to activate the launch control
function:
• Vehicle stationary/engine running
• DSC in "OFF" position
• SMG in "S6" position
• Hold selector lever in "Minus" position
• Fully depress accelerator pedal and hold in
this position
• Release selector lever.
The engine speed is controlled at 4,000 rpm
in this function. After releasing the selector
lever, the clutch is applied with defined slip in
order to achieve the best acceleration values.
The SMG uses the front wheel speeds to
calculate and release the slip of the rear
wheels.
If the clutch monitoring logic detects clutch
overheating, the clutch is fully engaged (100
%) in order to protect the components.
Teaching in the axle difference
The teach-in function for the axle difference
must be initiated manually after a change in
the dynamic rolling circumference (tyre
change, snow chains, etc.) of one or several
wheels on the vehicle to ensure correct
operation of the transmission control system.
These differences are also adapted
automatically but with a considerable time
delay.
This function is initiated manually as follows:
• Vehicle speed between 30 and
150 km/h
• Transmission in position "N"
• Brakes not applied
• Pull both shift paddles on steering wheel for
2 seconds.