Asr System (Electronic Anti-Skid Device) - Maserati Quattroporte Automatic 2009 Owner's Manual

M139_UM_usa1.book Page 44 Monday, September 1, 2008 2:39 PM
ASR system (electronic
anti-skid device)
The ASR system is designed to help
prevent skidding of the driving wheels
during acceleration by means of the
engine control unit (spark advance
2
delay, engine throttle opening
reduction and fuel injection cut-out)
and of the rear brakes.
The ASR system enhances the vehicle
stability and helps improve active
safety while driving, especially under
the following conditions:
– internal wheel skidding on curves
because of the dynamic load
variations or excessive acceleration
– excessive power transmitted to the
wheels, also in relation to the road
conditions
– acceleration on slippery, snowy or icy
roadways
– loss of road grip on wet roads
(aquaplaning).
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ASR system (electronic anti-skid device)

The ASR system works together with
the electronic suspension control
system: under normal conditions
(SPORT mode off), stability in low and
medium grip conditions has priority,
while with SPORT mode active, the
system favors traction, thereby
optimizing vehicle's performance on
dry asphalt.
Activation
The ASR system is automatically
activated every time the engine is
started and can be deactivated by
pressing button A for about 2 seconds.
Press button A again to reactivate the
system.
The dark yellow warning light on
the instrument panel flashes during all
the activation phases.
Fault indicators
In the event of a fault, the system is
automatically disabled and cannot be
reactivated. This condition is signalled,
while driving, by the amber warning
light, that comes on the multi-
function display, accompanied by the
message "ASR failure go to dealer".
MSR function (engine braking
torque adjustment)
The MSR system is also designed to
control the engine braking torque
when the accelerator pedal is released
under low grip conditions (e.g., snow,
ice, etc.): in these conditions, in fact,
the engine's high braking torque may
cause instability of the vehicle.
The system, using the same sensors as
the ABS, detects the skidding arising
on one or both of the driving wheels
when the accelerator is released and
opens the motor driven throttle for the
engine supply system, thereby
reducing the braking torque and
restoring the driving wheels maximum
grip conditions.
WARNING: The maximum deceleration
that can be obtained with the engine
braking always depends on the tire
grip on the roadway. Snow or ice
obviously reduce grip levels.