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All wheel
drive
(quattro)
Applies to: vehicles wit h all wheel drive
In oil wheel drive, oil four wheels ore powered.
General info rmation
In all wheel drive, t he driving power is divided be-
tween all four wheels . This happens automatical-
ly depending on your driving behavior as well as
the current road conditions. Also see
¢ page 92.
The a ll wheel d rive concept is designed for high
engine powe r. Your vehicle is exceptionally pow-
erful and has excellent driving characteristics
both under norma l driving conditions and on
snow and ice. Always read and fo llow safety pre-
cautions ¢ .&..
Winter t ires
By using all wheel drive, your vehicle has good
forward
motion with standard tires in w inter con-
ditions. However, we recommend using winter or
all season tires on
all four
whee ls in the winter,
because this will improve the
broking
effect.
Snow chains
If there are snow chain laws, snow chains must
a lso be used on vehicles with all wheel drive
¢ page 186, Snow chains.
Replacing t ires
For vehicles w ith all wheel dr ive, only wheels w ith
the same ro lling circumference shou ld be used .
Avoid using t ires with different tread depths
¢
page 178, New tires or wheels .
A
WARNING
- Also, in vehicles with all wheel drive, adapt
your dr iving style to the current road and
traff ic conditions. Do not let the increased
safety provided tempt you into tak ing risks,
because th is increases the ris k of an acci-
dent.
- The braking ability of your veh icle is limited
to the tract ion of the wheels . In this way, it
is not diffe rent from a t wo whee l dr ive vehi-
cle. Do not be tempted to accelerate t o a
high speed when the road is slippe ry, be-
cause this increases t he risk of an accident .
Intellig
e nt Technology
- Note that on wet streets, the front wheels
can "hydrop lane" if dr iving at speeds that
are too high . Unlike front wheel drive
veh icles, the engine does not rev higher sud-
denly when the vehicle begins hydroplan ing .
For this reason, adapt your speed to the
road conditions to red uce the risk of an acci-
dent.
Energy
management
The starting ability is optimized
The energy management system manages the
electrical energy distribution and optimizes the
availability of electrical energy for starting the
engine.
When a vehicle with a conventiona l energy sys-
tem is not driven for a long time , the vehicle bat-
tery is drained by equipment (for example, the
immobilizer). In certa in circumstances,
there
could may not be enough energy to start the en -
gine.
Your vehicle is equipped with an intel li gent ener-
gy management
system for distributing electrici-
ty . This sign ificantly improves the start ing ability
and increases the vehicle battery life .
The energy management
system Is made up of
battery diagnosis, idling current manag ement,
and
dynamic energy manag ement .
Battery diagnosis
The battery diagnosis determines the vehicle bat-
tery charge level. The sensors determine the bat-
tery voltage, the battery current, and the battery
temperature.
The current charge level and the
performance of the vehicle battery a re deter-
mined based on this.
Idling current management
The idling current management
decreases the
energy used while parked. With the engine
switched off, it manages the energy dis t ribution
to the d ifferent e lectr ica l components.
Data from
the battery d iagnosis is taken into account for
t his.
97
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