2004 PORSCHE CAYENNE differential

Overview Illustrations
13
Center console, front1. Porsche Communication Management (PCM)
See separate operating instructions.
2. Air conditioner
See Page 64.
3. Ashtray/cigarette lighter
See Page 226.
4. Cupholder
See Page 226.
5. Reduction (Low Range), differential locks
See Page 177.
6. Sport mode
See Page 179.
7. Porsche Active Suspension Management
(PASM) running-gear setup
See Page 193.
8. Height adjustment, air suspension
See Page 190.
9. Armrest, storage trays
See Page 224.
10.ParkAssistent warning indicator
See Page 239.
11.Vents
See Page 79.
12.Glove compartment
See Page 223.
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Multi-Purpose Display and Instruments
117
Instrument Panel USA ModelsAOil temperature gage
BTa c h o m e t e r
CClock
DClock setting button
ECooling system temperature gage
FMulti-purpose display
GFuel gage
HReset button for trip counter display
ISpeedometer
JMileage displays
KVoltmeter
Warning and indicator lights on the
tachometer
Indicator lights in central instrument
panelWarning and indicator lights on the
speedometer
Emission Control warning light
(Check Engine)
Airbag warning light
Safety belt warning light
PSM warning light
ABS warning light
Cruise control readiness
Turn signal indicator light, left
Turn signal indicator light, right
Trailer turn signal
Indicator light
Rear fog light indicator light
Tire pressure warning light
Differential locking indicator light
Brake warning light
Fog light indicator light
General warning
Observe warning message on the multi-
purpose display!
High beam indicator light
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Multi-Purpose Display and Instruments
119
Instrument Panel Canada ModelsAOil temperature gage
BTa c h o m e t e r
CClock
DClock setting button
ECooling system temperature gage
FMulti-purpose display
GFuel gage
HReset button for trip counter display
ISpeedometer
JMileage displays
KVoltmeter
Warning and indicator lights on the
tachometer
Indicator lights in central instrument
panelWarning and indicator lights on the
speedometer
Emission Control warning light
(Check Engine)
Airbag warning light
Safety belt warning light
PSM warning light
ABS warning light
Cruise control readiness
Turn signal indicator light, left
Turn signal indicator light, right
Trailer turn signal
Indicator light
Rear fog light indicator light
Tire pressure warning light
Differential locking indicator light
Brake warning light
Fog light indicator light
General warning
Observe warning message on the multi-
purpose display!
High beam indicator light
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Multi-Purpose Display and Instruments
131
Note on operation
fFor information on the operating principle of
the multi-purpose display:
Please see the chapter “OPERATING
PRINCIPLE” on Page 124.
Displaying status of level controlThe ground clearance of vehicles equipped with
level control is shown in the LEVEL menu.
Note on operation
The level control is adjusted by means of the
rocker switch behind the gearshift lever in the
center console.
For information on level control and height
adjustment:
Please see the chapter “AIR SUSPENSION WITH
LEVEL CONTROL AND HEIGHT ADJUSTMENT” on
Page 190.
Displaying status of locks/reduc-
tionThe selected driving programs for Low Range/
High Range as well as the engaged locks can be
displayed.
Note on operation
The driving programs are set by means of the
rocker switch behind the gearshift lever in the
center console.
fFor information on the programs for Off Road
and On Road driving and engaging locks/
reduction:
Please see the chapter “DRIVING PROGRAMS
FOR ON-ROAD AND OFF-ROAD DRIVING” on
Page 177.
1.MAIN MENU
>VEHICLE INFO
Select and confirm.
2.Select WARNINGS.
3.Confirm selection.
NO WARNING is displayed if the vehicle is in
perfect condition. Any warning messages
which are present are displayed.
4.Press repeatedly to display the warnings one
after the other.
5.Confirm selection.
VEHICLE INFO menu is displayed.
1.MAIN MENU
>VEHICLE INFO
Select and confirm.
2.Select LEVEL.
3.Confirm selection.
The current level settings are displayed.
4.Confirm selection.
VEHICLE INFO menu is displayed.
1.MAIN MENU
>VEHICLE INFO
Select and confirm.
2.Select LOCKS/REDUCT.
3.Confirm selection.
The current settings for
- Longitudinal lock on/off
- Reduction on/off
- Transverse axle differential lock on/off are
displayed.
4.Confirm selection.
VEHICLE INFO menu is displayed.
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Driving and Driving Safety
177
Driving Programs for On-Road and
Off-Road DrivingTwo different driving programs with special power-
transmission and running-gear control systems
(such as ABS, off-road ABS and PSM, etc.) are pro-
vided in your Porsche for realising the best possib-
le driving dynamics combined with maximum safe-
ty.
– Low Range off-road driving program
(with reduction)
– High Range on-road driving program
(without reduction)When the driving program is active, the power
transmission and running-gear control systems
are automatically adapted to the requirements for
off-road or on-road driving.
Selecting driving programThe particular driving program can be selected
using the rocker switch A.
The rocker switch A is located in the center con-
sole of the vehicle. It features a multi-step function
and can be operated in both directions.
Note on operation
The number of differential locks that can be enga-
ged in Low Range depends on the equipment of
your vehicle.
Prerequisites for manual settings
Vehicles with manual transmission
fStop the vehicle.
fApply the brake.
fPut the gearshift lever in neutral.
Caution!
Risk of engine damage (overrevving). In the
Low Range program, the gear-shifting points
are shifted towards lower engine-speed ran-
ges.
fShift early to prevent overrevving the engine.
Vehicles with Tiptronic S
fWhen selecting the off-road driving program:
Reduce speed to below 9.3 mph (15 km / h) or
stop vehicle.
fWhen selecting the on-road driving program:
Reduce speed to below 19 mph (30 km / h) or
stop vehicle.
fMove Tiptronic selector lever to position N.
Danger!
Risk of accident, resulting in serious perso-
nal injury or death due to uncontrolled vehic-
le movement. The Tiptronic selector lever is
blocked during the shifting procedure. Shif-
ting when driving uphill can cause the vehicle
to stand still or even roll backwards, if the
shifting procedure has not yet been comple-
ted. When driving downhill, the vehicle can
accelerate unintentionally while shifting.
fIncreased brake readiness is required.
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178
Driving and Driving Safety Selecting off-road driving program
fPush rocker switch forward .
The vehicle becomes one step more suitable
for off-road driving.
Selecting on-road driving program
fPull rocker switch to the rear .
The vehicle becomes one step more suitable
for on-road driving.
Once the driving program has been selected, the
rocker switch springs back to home position.
A-High Range on-road driving program
(without reduction)
B-Low Range off-road driving program
(with reduction)
C-Center differential lock in Low Range is fully engaged
D-Rear differential lock in Low Range is fully engagedDisplay of the selected driving program
The selected driving program is displayed by light-
emitting diodes next to the rocker switch (illustra-
tion).
The corresponding indicator lights on the instru-
ment panel and light-emitting diodes beside the ro-
cker switch flash several times during the shif-
ting process.Tip on driving center differential lock
When the center differential lock C is fully enga-
ged, there is no longer any speed difference bet-
ween the front and rear axles. If, for example, both
wheels at the front axle lose traction on an icy
road or soft surface, the rigidly linked drive wheels
will permit the car to continue moving neverthe-
less.
Tip on driving rear-differential lock
When the rear differential lock D is fully engaged,
there is no longer any speed difference between
the two rear wheels. If, for example, one drive
wheel at the rear axle loses traction on an icy road
or soft surface, the rigidly linked drive wheels will
permit the car to continue moving nevertheless.
Note on operation
The rear differential lock can be engaged only
while the engine is running.
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Driving and Driving Safety
181
Power-Transmission and Running-Gear Control SystemsA complex interconnection of all control systems acting in power transmission and in the running gear has been realized in your Porsche.
All control systems have been linked with the aim of combining the best possible driving performance with maximum safety.
The following systems are involved:
System/designation Scope
PTM
Porsche Traction Management– Full-time all-wheel drive
– Electronically controlled center differential lock
– Automatic brake differential (ABD)
– Traction control system (TCS)
– Reduction gear/Low Range
PTM Plus
Porsche Traction ManagementIn addition to the PTM features, PTM Plus also includes:
– Electronically controlled rear differential lock
PSM
Porsche Stability Management– Stability management system
– Anti-lock brake system (ABS)
– Brake system prefilling
– Brake booster
– Traction control system (TCS)
– Automatic brake differential (ABD)
– Engine drag torque control (MSR)
Air suspension
with level control and height adjustment– Fully load bearing air spring struts with integral shock absorbers
– Air supply system with pressure accumulator
PAS M
Porsche Active Suspension Management– Shock absorber system with adaptive, continuous shock absorber control
PDCC
Porsche Dynamic Chassis Control– Active chassis control system to stabilize roll tendency of vehicle body when driving
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182
Driving and Driving Safety
Warning!
In spite of the advantages of PTM or four-wheel dri-
ve, it is still the driver’s responsibility to adapt her/
his driving style and maneuvers in line with road
and weather conditions, as well as the traffic situ-
ation.
The increased safety that is provided should not
induce you to take greater risks with your safety.
The limits set by the physics of driving cannot be
overcome, even with PTM or four-wheel drive.
Risks of accident due to inappropriate speed
cannot be reduced by PTM.Porsche Traction Management (PTM)Porsche Traction Management is a full-time all-
wheel control system designed to influence the
longitudinal and lateral dynamics. It is closely
linked with the Porsche Stability Management
(PSM) system:
PTM ensures the best possible power distribution
to the four driven wheels at the front and rear
axles. The system realizes this optimal traction by
intervening in the lock control function of the trans-
fer case and rear differential. PTM is active at all
times and, unlike the PSM, cannot be switched off.Advantages of PTM
– Obvious improvement in traction, driving
stability and steering ability of the car.
– Vehicle is more manageable when driven at its
performance limits.
– Improved straight-ahead tracking and stability.
– The aforementioned features allow for a
sportier setup of the running gear.
– The TCS and ABD provide even better traction
for all wheels.
Full-time all-wheel drive
With the four-wheel drive, the drive power is
variably distributed to the front and rear wheels.
Power distribution and wheel speed compensation
between the front and rear axles is realized with a
transfer box.
Distribution of the drive power depends on the
wheel speed difference between the two axles.
The transfer box always controls power distribu-
tion in such a way that optimal propulsion is achie-
ved, even on an unfavorable road surface.
Full-time four-wheel drive ensures optimal handling
and greater stability.Automatic brake differential (ABD)
The ABD system controls the front and rear axles
separately. If one wheel of an axle starts to spin,
it is braked so that the other wheel on the same
axle can be driven.
The ABD recognizes different driving states, and it
features control strategies adapted to these
states. In situations in which little propulsive power
is required, such as when the car moves off on a
level gravel surface, traction control already
becomes active at low engine speeds. If great
propulsive power is required, e.g. when moving off
on an uphill slope or for rapid acceleration, the
ABD is adapted accordingly.
A special off-road program is used in Low Range
mode.
Traction control system (TCS)
The traction control system prevents the wheels
from spinning by adjusting the engine power,
thereby ensuring good lane-holding ability and a
stable driving behavior.10_Cayenne_21_KW17.book Seite 182 Donnerstag, 9. April 2009 3:33 15