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Electronic differential lock (EDL)
The electronic differential lock monitors the
rotational speed of the drive wheels.
General notes
The electronic differentia l lock (EDL) helps the
car to start moving, accelerate and climb a
gradient on surfaces providing poor or almost
no gr ip. W ithout EDL, this would be difficult,
if not impossible .
How the system work s
The EDL operates automatically .
It
monitors
the rotat ional speed of wheels w ith the help
of the ABS sensors
q
page 201. If a noticea-
ble slip is detected at the wheels (e.g. on slip-
pery ground on one side), the spinning wheels
are braked and power is transferred to the
other wheels. This is done up to a speed of
about 78 mph (125 km/h). Noises from the
brake system signal that wheel spin is being
contro ll ed .
Driving off
When driv ing off , always be sure to keep road
conditions in mind as you accelerate . If one
drive whee l spins because it is on a surface
with less grip, apply plenty of throttle until
the car starts to move.
Overheating of brakes
To prevent the disc brake of the braked wheel
from overheating if subjected to excessive
loads on this whee l, the EDL cuts out tempo -
rarily . The vehicle remains operational and be-
haves in the same way as a vehicle without
EDL.
As soon as the brake has cooled down, EDL
switches on again automatically .
A
WARNING
- When accelerating on slippery surfaces,
such as on ice or snow, always be careful
when depressing the accelerator pedal.
Even with the EDL working, the drive
wheels can spin and reduce your ability
to control your car. Risk of crash!
Int e llig e nt technolog
y
199
- The increased safety afforded by EDL
does not mean that you can take safety
risks. Always adapt your driving style to
the road condit ions and traffic situation .
(!)
Tips
If a fault occurs in the ABS, the EDL is also
not functioning. This is ind icated by the
ABS warning light
q
page 17.
'
Anti-Slip Regulation System (ASR)
The Anti-Slip Regulation System prevents the
driven wheels from spinning when the car is
accelerating.
General not es
The Anti -Slip Regulation System (ASR) is inte-
grated in the electronic stabilization program
(ESP). When the vehicle starts up and acceler-
ates, the wheels are prevented from spinning
by adjust ing the engine power to match the
amount of grip available from the road sur-
face .
How the system works
ASR performs automat ically, i.e. w ithout the
driver 's intervention. With the aid of the ABS
sensors
q
page 201, ASR monitors the speed
of the dr iven wheels. If the wheels start to
spin, engine torque is reduced automatically
unt il the t ires find enough grip to lock onto
the road surface. The system is active across
the enti re speed range.
The ASR works in conjunction with the ABS. If
a malfunction should occur in the ABS, the
ASR wi ll also be out of act ion.
A
WARNING
The increased safety affo rded by ASR does
not mean that you can take saf ety risks.
Always adapt your driving sty le to the road
conditions and traffic situation.
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