Mercedes-Benz C 230 1998 Owner's Manual page 98

A cceleration Slip R egulation
(ASR)
The acceleration slip regulation will
engage at all vehicle speeds, if one
or both drive w heels begin to lose
traction and spin in acceleration.
W hile engaged, the yellow warning
lamp in the speedom eter dial
flashes.
W ith the acceleration slip regula­
tion engaged, the brake is applied
to the spinning drive wheel until
slip is brought under control. If both
drive w heels spin, the brake is
applied to both drive w heels and
sim ultaneously, engine torque is
limited, to im prove the ve hicle 's
driving stability.
As traction on the road surface
increases, thus allowing a ccelera­
tion w ithout slip, the allow able
engine torque also increases again
and the brake is no longer applied
to drive wheels.
Im portant!
If the ASR w arning lam p flashes,
adapt your speed and driving to the
prevailing road conditions.
96
Caution!
If the vehicle is towed with the front
axle raised (see Towing the vehicle
in Index), the engine m ust be shut
off (key in steering lock position 0
or 1). O therwise, the acceleration
slip regulation will im m ediately be
engaged and will apply the rear
wheel brakes.
Notes:
The indicator lamp for the ASR is
com bined with that of the BAS
The yellow BAS/ASR m alfunction
indicator lam p in the instrum ent
cluster and the yellow ASR w arn­
ing lamp in the speedom eter dial
com e on with the electronic key in
steering lock position 2. They
should go out with the engine
running.
If the BAS/ASR m alfunction indi­
cator lamp com es on with the en­
gine running, a m alfunction has
been detected in either system.
Pressing the accelerator pedal will
require greater effort. Only partial
engine output will be available.
If the BAS m alfunctions, the brake
system functions in the usual
m anner, but w ithout BAS.
Have the BAS or ASR checked at
yo ur authorized M ercedes-Benz
dealer as soon as possible.
W ith the ABS m alfunctioning, the
ASR is also sw itched off.
Driving the vehicle with varied size
tires will cause the w heels to rotate
at different speeds, therefore the
acceleration slip regulation may
activate (yellow ASR warning lamp
in speedom eter dial com es on).
For this reason, all w heels, includ­
ing the spare wheel, m ust have the
sam e tire size.
W hen testing the parking brake on
a brake test dynam om eter, the en­
gine m ust be shut off. O therwise,
the acceleration slip regulation will
im m ediately be engaged and will
apply the rear wheel brakes.
In w inter operation, the m axim um
effectiveness of the acceleration
slip regulation is only achieved with
M ercedes-Benz recom m ended
M+S radial-ply tires and/or snow
chains.