Porsche Cayenne Turbo Driver Manual page 189

Off-road PSM
(PSM in Low Range off-road programme)
When the Low Range off-road driving programme
is active, an off-road PSM specially matched to off-
road driving is activated to enhance traction.
In order to improve driveability on difficult terrain,
the response of the off-road PSM is less sensitive
in the low speed range when the vehicle is
operated in the Low Range off-road driving
programme.
If the brakes are highly stressed, the automatic
brake differential (ABD) switches itself off to
protect the brakes. It remains deactivated until the
brake system has cooled sufficiently again.
Engine drag torque control (MSR)
In conditions of excessive slip, the engine drag
torque control system prevents all driven wheels
locking up when the vehicle is overrunning. This is
also the case for downshifts on a slippery road.
Switching off PSM
f Press PSM OFF button A.
PSM is switched off after a short delay.
The light-emitting diode in the button is lit up.
When PSM is switched off, the multi-functional
PSM light on the instrument panel lights up
and a message appears on the multi-purpose
display of the instrument panel.
During braking, the vehicle is stabilised even
when PSM is switched off.
One-sided spinning of the wheels is prevented,
even with PSM switched off.
PSM should always be switched on during
"normal" driving.
However, it may be advantageous to switch off
PSM temporarily in exceptional situations:
– On a loose surface and in deep snow,
– When "rocking the vehicle free" and
– When using snow chains.
When the PSM is switched off the slip monitoring
function of the Tiptronic is also deactivated.
Driving and Driving Safety
189