Mercedes-Benz E 320 1994, Owner'S Manual

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Acceleration Slip Control (ASR)
The acceleration slip control will
engage at all vehicle speeds, if
one or both drive wheels begin to
lose traction and spin due to
excessive acceleration. While
engaged, the yellow function indi­
cator in the speedometer lights up.
With the acceleration slip control
engaged, the brake is applied to
the spinning drive wheel until it
regains sufficient traction. If both
drive wheels lose traction and
spin, the brake is applied to both
drive wheels and simultaneously,
engine torque is limited.
As traction on the road surface
increases, the allowable engine
torque also increases again and
the brake is no longer applied to
drive wheels.
Caution!
If the vehicle is towed with the
front axle raised (see Towing the
vehicle in Index), the key must not
be in steering lock position 2.
Otherwise, the acceleration slip
control will immediately be en­
gaged and will apply the rear
wheel brakes.
Notes:
With the key in steering lock posi­
tion 2, the yellow function indicator
lamp and the yellow ASR warning
lamp in the instrument cluster
come on. They must go out when
the engine is running.
If the ASR warning lamp comes
on with the engine running, a
malfunction has been detected.
Pressing the accelerator pedal will
require greater effort. Only partial
engine output is available.
Have the acceleration slip control
checked at your authorized
Mercedes-Benz dealer as soon as
possible.
Driving the vehicle with varied size
tires will cause the wheels to ro­
tate at different speeds, therefore
the acceleration slip control will
activate (yellow ASR function
indicator lamp in instrument clus­
ter comes on). For this reason, all
wheels, including the spare wheel,
must have the same tire size.
When testing the parking brake on
a brake test dynamometer, the key
must not be in steering lock posi­
tion 2. Otherwise, the acceleration
slip control will immediately be
engaged and will apply the rear
wheel brakes.
In winter operation, the maximum
effectiveness of the acceleration
slip control is only achieved with
Mercedes-Benz recommended
M + S radial-ply tires.
On vehicles equipped with accel­
eration slip control, the brake pad
wear warning lamp indicates brake
pad wear for the front as well as
the rear brakes.
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