140
Starting and driving
Lock-up
The transmission’s torque converter has a
so-called lock-up function. This means that
in gear, the torque converter is locked in,
which reduces engine speed and fuel con-
sumption.
Kick-down
When the accelerator is pressed down fully,
a down change is made to optimize
acceleration, e.g. for overtaking.
Following this, the next higher gear will be
selected at the optimum engine speed or, if
you ease off the accelerator, before
reaching this.
Driving with a heavy load on hilly
roads
The transmission fluid can overheat when
the gearbox is strained, for example, when
driving with a caravan on hilly roads. To
avoid the transmission fluid overheating,
always drive with the selector lever in the
D position. The adaptive gear change pat-
terns are then active.
High air temperatures or a faulty oil cooler
can also cause the transmission fluid to
overheat. Overheating reduces the service
life of the fluid.
Towing
Towing of cars with automatic transmission,
see page 167.
Descending hills
If the speed of the car increases while
descending a steep hill, despite the acceler-
ator being released, the control module will
change down. If you desire more powerful
engine braking, manually select a lower
gear, see page 143.
Limp-home
If the transmission malfunctions, the control
module will activate limp-home mode.
Driveability will be affected to varying
degrees.
the following message then appears on
the DIC:
WARNING
Remember to use the braking effect of the
engine (1st, 2nd or 3rd gear) when you
are descending long or steep hills to
spare the brakes.
Overheating can cause the brakes to
fade!
NOTICE
Do not tow a caravan or trailer if limp-
home mode is engaged.
Gearbox malfunction.
Limited performance.
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