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DRIVER SUPPORT
174
Stability system – introduction
The Electronic Stability Control (ESC) system
consists of a number of functions designed to
help reduce wheel spin, counteract skidding and
to generally help improve directional stability.
A pulsating sound will be audible when
the system is actively operating and is
normal. Acceleration will also be
slightly slower than normal.
WARNING
•
The stability system (ESC) is intended to
help improve driving safety but cannot
deal with all situations, or traffic, road and
weather conditions. Speed and driving
style should always be adapted to the
current driving situation.
•
ESC supplements, but can never replace,
the driver's judgment and responsibility
when operating the vehicle. The driver is
always responsible for operating the vehi-
cle in a safe manner in accordance with
applicable traffic regulations.
ESC consists of the following functions:
•
Traction control
•
Spin control
•
Active Yaw Control
•
Engine Drag Control
•
Corner Traction Control
Traction Control (TC)
This function is designed to help reduce wheel
spin at low speeds by transferring power from a
drive wheel that begins to lose traction to the
wheel on the opposite side of the vehicle (on the
same axle).
Spin Control (SC)
The SC function is designed to help prevent the
drive wheels from spinning while the vehicle is
accelerating.
Active Yaw Control (AYC)
This function helps maintain directional stability,
for example when cornering, by braking one or
more of the wheels if the vehicle shows a ten-
dency to skid or slide laterally.
Corner Traction Control (CTC)
CTC compensates for understeering and helps
provide additional stability when accelerating
through a curve by preventing the inside wheel
from spinning. This is particularly useful when
accelerating on a curving highway on-ramp.
CTC is most effective if the stability system's
Sport mode is selected. See the section about
Sport mode.
Engine Drag Control (EDC)
EDC helps keep the engine running if the wheels
show a tendency to lock, e.g., when shifting down
in the Geartronic manual shifting mode or while
using the engine's braking function on a slippery
surface. If the engine were to stop, power steer-
ing would not function, making the vehicle more
difficult to steer.
Trailer Stability Assist (TSA)
The TSA helps stabilize a vehicle that is towing a
trailer when the vehicle and trailer have begun to
sway. See Trailer Stability Assist (TSA) (p. 294)
for more information.
This system is automatically deactivated if the
driver selects Sport mode.
Related information
•
Stability system – operation (p. 175)
•
Stability system – symbols and messages
(p. 176)
•
Trailer Stability Assist (TSA) (p. 294)
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