Emergency operation (limp-home mode), Controls in detail – Mercedes-Benz M-Class 2009 Owners Manual User Manual
Page 139
Automatic transmission
137
the engine could be damaged which is not
covered by the Mercedes-Benz Limited
Warranty.
X
Briefly pull right gearshift control
2
The automatic transmission shifts into the
next higher gear.
Upshift indicator
1
Current gear
2
Upshift indicator
In manual program mode
M, upshift indicator
2
in the multifunction display advises you to
upshift before the engine reaches the
overspeed range. Thus you can drive at the
maximum engine speed for each gear without
overrevving the engine.
X
Shift the automatic transmission from
current gear
1
into the next higher gear.
The fuel supply will otherwise be
interrupted to prevent the engine from
overrevving.
Downshifting
On slippery road surfaces, never downshift
in order to obtain braking action. This could
result in drive wheel slip and reduced
vehicle control. Your vehicle’s ABS will not
prevent this type of loss of control.
X
Briefly pull left gearshift control
1
The automatic transmission shifts into the
next lower gear.
i
For maximum acceleration, pull and hold
the left gearshift control. Depending on the
engine speed the automatic transmission
selects the optimal gear for maximum
acceleration.
i
When you brake or stop, the automatic
transmission shifts down into a gear from
which you can easily accelerate or take off.
Kickdown
Using the kickdown when driving in manual
program mode
M is not possible.
Deactivating manual shift program
X
Press the program mode selector switch
repeatedly until C or S appears in the
multifunction display.
or
X
Restart the engine.
The automatic transmission will go to
automatic program mode (
C or S).
Manual program mode
M is not stored.
If vehicle acceleration becomes less
responsive or sluggish or the automatic
transmission no longer shifts, the automatic
transmission is most likely operating in limp-
home (emergency operation) mode. In this
mode only second gear and reverse gear
R
can be selected.
Controls in detail
Z