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Porsche Stability Management (PSM)
Porsche Stability Manage-
A
ment (PSM)
B
PSM is an active control system for stabilizing the
C
vehicle in extreme driving situations. It is automati-
D
cally enabled when the engine starts. PSM makes
use of the automatic brake differential (ABD) and the
E
anti-slip regulation (ASR) as well as the functions of
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the anti-lock braking system (ABS) and the engine
drag torque control (EDC).
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WARNING
H
I
The PSM cannot reduce the risk of accidents due to
inappropriate speed.
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The increased safety that is provided should not in-
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duce you to take greater risks with your safety. The
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limits set by the laws of driving physics cannot be
overridden by PSM.
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e Despite the advantages of PSM, drivers remain
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responsible for adapting their driving style and
maneuvers to the road and weather conditions,
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as well as the traffic situation.
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The events below inform the driver of PSM control
Q
operations:
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– PSM warning light on the instrument cluster
flashes.
S
– Hydraulic noises are audible.
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– Vehicle decelerations and modification of steer-
ing wheel forces through targeted brake
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intervention.
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– Reduced engine power.
– Pulsing brake pedal and changes in brake pedal
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position when braking. To achieve full vehicle
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deceleration, the foot pressure must be in-
creased after the brake pedal starts to pulse.
Y
Z
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Automatic brake differential (ABD)
If one wheel on a driven axle starts to spin, it is
braked so that the other wheel on the same axle can
be driven.
Anti-slip regulation (ASR)
Anti-slip regulation prevents wheels from spinning
through targeted adjustment of engine power,
thereby ensuring good road-holding ability and sta-
ble vehicle handling.
Loss of control over the
vehicle
Engine drag torque control (EDC)
In conditions of excessive slip, the engine drag tor-
que control system prevents all driven wheels from
locking up when the vehicle is overrunning. This is
also the case when shifting to a lower gear on a
slippery road.
Steering torque pulse
Steering torque pulse provides the driver steering
assistance when braking on roads with varying fric-
tion values. Additional steering forces also assist the
driver during countersteering.
Activating sport PSM
b b Vehicles with Sport Chrono package.
In sport PSM mode, the system operates in a par-
ticularly sporty mode.
In PSM Sport mode, the support provided by PSM is
restricted in critical driving situations outside the
Restricted PSM support
WARNING
ABS control range.
e Always leave PSM Sport switched off during
"normal" driving operation.
e Never activate PSM Sport when driving with a
spare wheel.
e Press button
briefly.
The light indicator on the button and the PSM
OFF warning light
in the instrument cluster
come on.
A message stating that PSM Sport is activated
appears on the instrument cluster.
Switching off PSM
Fig. 159: PSM OFF button in the center console
No PSM support
WARNING
When PSM is switched off, the support provided by
PSM is absent in critical driving situations outside
the ABS control range.
e Always leave PSM switched on during "normal"
driving operation.
e Never switch PSM off when driving with a spare
wheel.
e Press button
for at least two seconds.
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