Mercedes-Benz 190 E 2.3 1991, Owner'S Manual

Page: 70 / 129

Driving the vehicle with different size
tires will cause the wheels to rotate at
different speeds, therefore the accel­
eration slip control will activate (yellow
ASR function indicator lamp in instru­
ment cluster comes on). For this rea­
son, all wheels, including the spare
wheel, must have the same tire size.
In winter operation, the maximum ef­
fectiveness of the acceleration slip
control is only achieved with M +S
radial-ply tires.
On vehicles equipped with accelera­
tion slip control, the brake pad wear
warning lamp indicates brake pad
wear for the front as well as the rear
brakes.
Caution!
If the vehicle is towed with the front
axle raised, the key must not be in
steering lock position 2. Otherwise,
the drive slip control will immediately
be engaged and will apply the rear
wheel brakes.
Automatic Locking Differential
(ASD)
The automatic locking differential en­
gages when there is a difference in
speed (slip) between the front and
rear wheels of over 2 km/h (1.2 mph)
and the vehicle speed is less than
25 km/h (15.5 mph). It will disengage
at speeds above 26 km/h (16.2 mph).
The yellow function indicator in the
speedometer comes on whenever
there is a difference in speed between
the front and rear wheels of over
2 km/h (1.2 mph), warning of slippery
road conditions.
Note:
The automatic locking differential will
not engage at speeds above 25 km/h
(15.5 mph). However, above this
speed, a limited-slip effect of up to
35% is always present.
In steering lock position 2, the yellow
function indicator lamp and the yellow
ASD indicator lamp in the instrument
cluster should come on and then must
go out with the engine running.
If the ASD indicator lamp comes on
with the engine running, a malfunction
has been detected. We recommend
that you visit an authorized
MERCEDES-BENZ dealer as soon as
possible to have the ASD checked.
Notes:
When testing the parking brake on a
brake test dynamometer, turn off the
engine to avoid engaging the auto­
matic locking differential.
In winter operation, the maximum
efficiency of the automatic locking dif­
ferential can oniy be attained through
the use of M +S radial-ply tires on all
four wheels.
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