Porsche Stability Management (Psm) - Porsche 911 2020 Owner's Manual

Porsche Stability
Management (PSM)
Porsche Stability Management (PSM) is an active
control system which helps to stabilize the vehicle in
extreme driving situations. It is automatically en-
abled when the engine starts. PSM makes use of the
automatic brake differential (ABD) and the anti-slip
regulation (ASR) as well as the functions of the anti-
lock braking system (ABS) and the engine drag tor-
que control (EDC).
Loss of control over the
WARNING
vehicle
The PSM cannot reduce the risk of accidents due to
inappropriate speed.
The increased safety that is provided should not in-
duce you to take greater risks with your safety. The
limits set by the laws of driving physics cannot be
overridden by PSM.
e Despite the advantages of PSM, drivers remain
responsible for adapting their driving style and
maneuvers to the road and weather conditions,
as well as the traffic situation.
The events below inform the driver of the PSM con-
trol operations:
– PSM warning light on the instrument cluster
flashes.
– Hydraulic noises are audible.
– Vehicle decelerations and modification of steer-
ing wheel forces through targeted brake
intervention.
– Engine power is reduced.
– Pulsing brake pedal and changes in brake pedal
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 lane-holding and stable
handling.
Engine drag torque control (EDC)
In the event of excessive slip, engine drag torque
control prevents all the driven wheels from locking
up during overrun. This also applies to downshifts on
slippery road surfaces.
Steering torque pulse
Steering torque pulse provides the driver with
steering assistance when braking on roads with
varying friction levels.
Additional steering forces also assist the driver dur-
ing countersteering.
PSM Activating Sport
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
ABS control range.
e Always leave PSM Sport switched off during
"normal" driving operation.
e Press button
briefly.

Porsche Stability Management (PSM)

The PSM OFF warning light on the instrument
cluster lights up. The button lights up red.
A message stating that PSM Sport is activated
appears on the instrument cluster.
Switching off PSM
Fig. 164: PSM OFF button on the switch panel
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 Press button
briefly (vehicles with Sport Chro-
no package: Press button for at least
two seconds).
PSM is switched off after a brief delay.
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