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Porsche Stability Manage-
ment (PSM)
PSM is an active control system for stabilizing the
vehicle in extreme driving situations. It is automati-
cally enabled when the engine starts. PSM makes
use of the automatic brake differential (ABD) and
the anti-slip regulation (ASR) as well as the func-
tions of the anti-lock braking system (ABS) and the
engine drag torque control (EDC).
Loss of control over the
WARNING
vehicle
PSM does not reduce the risk of accidents owing
to an inappropriate driving speed.
The increased safety provided should not induce
you to take greater risks with your safety. The lim-
its set by the laws of driving physics cannot be
overcome, even with PSM.
e Despite the advantages of PSM, the driver is
responsible for adapting his or her driving style
and maneuvers in line with road and weather
conditions, as well as the traffic situation.
The events below inform the driver of PSM control
operations:
– PSM warning light on the instrument cluster
flashes.
– Hydraulic noises are audible.
– Vehicle decelerations and modification of
steering wheel forces through targeted brake
intervention.
– Reduced engine power.
– Pulsing brake pedal and changes in brake ped-
al position when braking. To achieve full vehicle
deceleration, the foot pressure must be in-
creased after the brake pedal starts to pulse.
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
stable vehicle handling.
Engine drag torque control (EDC)
In conditions of excessive slip, the engine drag
torque 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
friction values. Additional steering forces also as-
sist 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.
Restricted PSM support
WARNING
In PSM Sport mode, the support provided by PSM
is restricted in critical driving situations outside the
P P o o r r s s c c h h e e S S t t a a b b i i l l i i t t y y M M a a n n a a g g e e m m e e n n t t ( ( P P S S M M ) )
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 (Fig. 145).
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. 145: PSM OFF button in the center console
Absent 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.
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