Chassis
Page 4.9
Error Message/Fail-Safe Mode
If a fault occurs during PDCC operation, the driver is alerted to this by
the message “Chassis system defective” on the on-board computer.
The entire system is switched to fail-safe mode to ensure safe driving.
The fail-safe valve in the front-axle valve block is de-energized, which
causes the pump hydraulic system to short circuit. The hydraulic oil
from the pump flows directly back into the reservoir. At the same time,
the connections for the swivel motor are closed so that the pressure in
the swivel motor is maintained. The anti-roll bar remains in this position
and continues to work in the conventional way.
The hydraulic system on the rear axle is completely depressurized so
that the vane controllers in the housing can turn freely and the anti-roll
bar halves are decoupled. This increases the vehicle’s lateral inclination
during cornering. The vehicle responds by understeering slightly, but
can be driven at an appropriate speed to the nearest authorized
Porsche dealer.
P - Hydraulic oil from the pump
R - Oil return to the reservoir
V - Fail-safe valve
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