PORSCHE CAYMAN 2010 1.G Repair Manual

Operation, Safety
59
ABS Brake System
(Antilock Brake System)The ABS system represents a major contribution
to the enhancement of active safety in your vehi-
cle. This system prevents the wheels from locking
in a panic stop on almost all road surfaces.
With the ABS system in your vehicle, the
following areas are enhanced:
Steering, vehicle remains steerable under all
braking forces when ABS is engaged.
Good directional control , no swerving caused
by locking of wheels under braking conditions.
Shorter stopping distance , stopping distances
are usually reduced because controlled braking is
maximized.
Prevention of wheel lock up , no brake- induced
sliding and thus no localized tire wear from emer-
gency braking.
The crucial advantage of the ABS system over a
conventional brake system is in the area of main-
taining directional control and maneuverability of
the car in emergency situations.
Warning!
The increased control that is provided should
not induce you to take greater risks with your
safety. The limits dictated by the laws of
physics cannot be overcome, even with ABS.
The risk of accidents due to inappropriate
speed cannot be reduced, even by the ABS.
The driver bears the responsibility for all
driving maneuvers.
f Adapt your driving style to the prevailing road
and weather conditions.
f Obey all traffic laws.
Other vehicles not equipped with the ABS
system may not be able to maintain control,
especially on wet or poor road surfaces and
thus may be more likely to impact you from
behind.
f To minimize that risk, use your ABS system to
increase your ability to maneuver to avoid dan-
gerous situations and not merely to try to stop in the shortest distance possible.
Operation of the ABS systemA wheel speed sensor is mounted to each of the
four wheels. If wheel lock -up of either of the front
wheels or the rear wheels is sensed during brak-
ing, the brake pressure is adjusted automatically
until the wheel no longer slips.
If braking forces approach the wheel lock-up point
for all wheels (panic brak ing) the ABS system will
intervene to provide a rapid rythmic braking. The
proper operation of ABS is perceived by the driver
as a pulsating brake pedal in conjunction with au-
dible noise and perhaps some vibration.
f If you experience these sensations while driv-
ing or a road surface with questionable trac-
tion, reduce vehicle speed appropriate for the
prevailing road conditions.
f If full braking should be necessary, press the
brake pedal all the wa y down throughout the
entire braking procedure, regardless of the pul-
sating pedal. Do not ease up on pressure ap-
plied to the pedal.
The functional readiness of all the main electrical
components of the ABS is checked by an
electronic monitoring system both before and
while you drive.

60
Operation, Safety
When the ignition is switched on the ABS warning
light will light up while the system is electronically
interrogated and goes o
ut when the engine is
started if the check is not yet complete.
If the ABS warning lamp fails to go out, this indi-
cates that ABS has been deactivated due to a
fault. If the warning lights in the instrument panel
and on-board computer light up while you are driv-
ing, this indicates that a fault has occurred. In both
cases, normal braking, as in vehicles without ABS,
is still retained.
The ABS system should, however, be examined at
an authorized Porsche dealer immediately to pre-
vent the occurrence of further faults.
f If the ABS system becomes inoperative, take
your vehicle to your authorized Porsche dealer
immediately.
Warning!
Risk of an accident, resulting in serious per-
sonal injury or death.
The control unit of the ABS brake system is
set for standard tire size. If non-standard
tires are installed, the control unit may mis-
interpret the speed of th e vehicle, because of
the variant data it rece ives from the sensors
on the axles.
f Use only tire makes and types tested by Porsche.
Clutch Pedal The clutch pedal must be depressed fully
before the starter will engage.
Warning!
Risk of an accident, resulting in serious per-
sonal injury or death.
f Always check the movement of the clutch ped-
al before driving and make sure that it is not
obstructed by a floor mat or any other object.
f Secure the floor mat to prevent it from sliding
into positions that could interfere with the safe
operation of your vehicle.
Your Porsche dealer will be glad to offer you
nonskid floor mats of the correct size.
To avoid damage to the clutch and transmis-
sion:
f Always depress the clutch pedal fully when
changing gears.
f Do not hold the car on a steep grade with the clutch pedal partially depressed.
Should the free travel of the clutch pedal suddenly
become larger, it could me an a malfunction of the
clutch.
f See your Porsche dealer for correction.
Warning light USA
Warning light Canada

Operation, Safety
61
Sport ModeA sportier car set-up is obtained when Sport mode
is switched on. Interventions by the Porsche
control systems are intentionally shifted towards
greater agility and driving performance:
– PASM (Porsche Active Suspension Manage-ment) is automatically changed to Sport mode,
resulting in a stiffer suspension setup.
– When Sport mode is active, the PDK transmis- sion switches to a sporty gear-changing map
and shortens the gear shifting times. Gear
changes take place faster, but fuel consump-
tion is also increased.
PSM (Porsche Stability Management) control
gives a sportier road-feel to the vehicle. PSM
interventions take place later than in Normal
mode. The driver can maneuver the vehicle
with greater agility at its performance limits,
without having to dispense with the assistance
of PSM in emergency situations. This helps to
achieve optimal lap times, particularly on race
circuits with a dry road surface.
– The electronic accelerator pedal reacts sooner, and the engine is more responsive to
throttle inputs. When Sport mode is switched
on, this function is ac tivated only after the
driver has floored the accelerator pedal or
released it briefly.
– The rpm limiter characteristic is “harder”, i.e. the engine is immediately throttled when the
performance limits are reached (only in manual selection mode for vehicles with PDK transmis-
sion).
f Please observe the chap ters on PSM, PASM
and PDK.
Switching Sport mode on and offSwitching Sport mode on and off simultaneously
activates and deactivate s the Sport mode in
PA S M .
If PASM Sport mode was activated with the PASM
button, PASM remains active.
After the ignition is switched off, Sport mode is
automatically reset to Normal mode.
SPORT button
f Press SPORT button A in the center console.
When Sport mode is switched on, the light-
emitting diode in the SPORT button is lit.
A sporty gear-changing map is enabled and the
gear shifting times ar e shortened for the PDK
transmission.
A sporty driving style is recognized more quickly
and the gear-changing speeds are adapted to
driving performance.
Deceleration downshifts are commenced earlier.
Downshifts are made during slight decelerations,
even at higher engine speeds.
f Please see the chapter “SPORT MODE
(“SPORT” AND “SPORT PLUS” MODES)” on
Page 180. SPORT PLUS button
(only on vehicles with PDK transmission)
In “Sport Plus” mode, the PDK transmission
changes to a shift program designed for driving
on race circuits. 7th gear is not selected.
The gear-changing performance is enhanced
significantly again compared with “Sport” mode.
f
Please see the chapter “SPORT MODE
(“SPORT” AND “SPORT PLUS” MODES)” on
Page 180.
f Press SPORT PLUS button B in the center
console.
When Sport mode is switched on, the light-
emitting diode in the SP ORT PLUS button is lit.

62
Operation, Safety
When mode “Sport” is switched on, the logo
SPORT appears next to the digital speedometer.
When mode “Sport Plus” is switched on, the logo
SPORT PLUS appears next to the digital
speedometer.

Operation, Safety
63
Porsche Stability Management
(PSM)PSM is an active control system for stabilization of
the vehicle approaching the performance limits of
driving maneuvers.
Warning!
Risk of an accident, resulting in serious per-
sonal injury or death.
The increased control that is provided should
not induce you to take greater risks with your
safety. The limits dictated by the laws of
physics cannot be overcome, even with PSM.
The risk of accidents due to inappropriate
speed cannot be reduced, even by PSM.
The driver bears the responsibility for all
driving maneuvers.
f Adapt your driving style to the prevailing road
and weather conditions.
fObey all traffic laws.
Sensors at the wheels, brakes, steering system
and engine continuously measure:
–Speed
– Direction of travel (steering angle)
– Lateral acceleration
– Rate of turn about the vertical axis
– Longitudinal acceleration PSM uses these values to determine the direction
of travel indicated by the driver.
PSM intervenes and helps to correct the course if
the actual direction of motion deviates from the
chosen course (steering-wheel position):
It brakes individual wheels as needed. In addition,
the engine power may be manipulated in order to
stabilize the vehicle.
The events below inform the driver of PSM control
operations and warn him/her to adapt his/her
driving style to the road conditions:
– The multifunctional in
formation light on the
instrument panel flashes.
– Hydraulic noises can be heard.
– The vehicle decelerate s and steering-wheel
forces are altered as the PSM controls the
brakes.
– Reduced engine power.
– The brake pedal pulsates and its position is changed during braking.
In order to achieve full vehicle deceleration,
foot pressure must be increased after the
brake pedal has begun vibrating.
Examples of PSM control operations– If the front wheels of the vehicle drift on a
bend, the rear wheel on the inside of the bend
is braked and the engine power is reduced if
necessary.
– If the rear of the vehicle swings out on a bend, the front wheel on the outside of the bend is
braked.Additional braking functions– Pre-filling the brake system:The brake system is prepared for possible
subsequent emergency braking if the acceler-
ator pedal is released suddenly and quickly.
The brake system is prefilled and the brake
pads are already applied gently to the brake
discs.
– Brake booster: In the event of an emergency braking operation
where the pedal force is insufficient, a brake
booster provides the braking pressure neces-
sary for maximum deceleration at all 4 wheels.Advantages of PSM– Best possible traction and lane-holding ability in all driving situations – even on road surfaces
with varying friction.

64
Operation, Safety
– The system compensates for undesired lateral
vehicle reactions when the driver releases the
accelerator pedal or brakes when cornering.
This compensation functions up to the
maximum lateral acceleration.
– PSM actively stabilizes the vehicle as required during dynamic driving maneuvers (e.g. rapid
steering movements, during lane changes or
on alternating bends).
– Improved braking stability on bends and on different or varying road surfaces.
– It improves braking function and shortens stopping distance in the event of emergency
braking.
Readiness for operationPSM is switched on automatically every time you
start the engine.
PSM should always be switched on during
“normal” driving.
However, it may be advantageous to switch off
PSM temporarily in exceptional situations, for
example:
– On a loose surface or in deep snow,
– When “rocking” the vehicle free and
– When using snow chains.
Switching off PSMf Press PSM OFF button.
PSM is switched off after a short delay.
The light-emitting diode in the button is lit up.
When the PSM is switched off, the PSM multi-
functional light on the instrument panel is lit
and a message is shown on the on-board
computer.
An acoustic signal also sounds.
Note
When PSM is switched off, the additional braking
functions are deactivated. Automatic reactivation
in emergency situations is linked to the PSM
control. The following functions stabilize the vehicle in
emergency situations, even with PSM switched
off:
– When PSM is off, the vehicle is stabilized as
soon as one of the two front wheels enters the
ABS control range.
– When PSM is off and Sport mode is on, the vehicle is stabilized as soon as both front
wheels enter the ABS control range.
One-sided spinning of the wheels is prevented,
even with PSM switched off.
Switching PSM back onf Press PSM OFF button.
PSM is switched on after a short delay.
The light-emitting diode in the button and the
PSM multifunctional li ght on the instrument
panel go out.
The on-board computer shows a message.

Operation, Safety
65
Sport modeA sportier car set-up is obtained when Sport or
Sport Plus mode is switched on.
PSM interventions are later than in Normal mode;
the vehicle can be maneuverd with greater agility
at its performance limits, without dispensing with
the assistance of PSM in emergency situations.
This helps to achieve optimal lap times, particu-
larly on race circuits and a dry road surface.
– The multifunctional light on the instrument panel lights up for a lamp check when the
ignition is switched on.
– The light indicates a control operation by flashing, including when PSM is switched off
(brake control in the ev ent of one-sided wheel
spin).
– In conjunction with a message on the on-board computer, the light indicates that PSM is
switched off.
An acoustic signal also sounds.
– The light indicates a faul t in conjunction with a
message on the on-board computer.
PSM is out of order. f
Please have the fault remedied at an author-
ized Porsche dealer.
f Please see the chapter “PUTTING VEHICLE
INTO OPERATION” on Page 241.
Towingf Please see the chapter “TOWING” on
Page 259.Checks on test standsBrake tests
Brake tests must be performed only on plate-type
test stands or roller test stands.
The ignition must be switched off.
The following limit values must not be exceeded
on roller test stands:
– Testing speed 5 mph (8 km/h)
– Test duration 20 seconds
Handbrake tests
Handbrake tests on the roller test stand must be
performed only with the ignition switched off .
PSM multifunctional light

66
Operation, Safety
PASM makes two running-gea
r setups available to
the driver: “Normal” and “Sport”.
The selection is made vi a a button on the center
console.
In Normal mode the runnin g gear is in a comfort-
able setup.
Sport mode offers very sporty shock absorber
tuning.
The variable suspension system selects the appro-
priate damping level for each wheel according to
the situation and driving conditions.
Example:
If the vehicle is driven in a very sporty manner in
Normal mode, PASM automatically adapts the
shock-absorber behavior to the driving situation
accordingly.
Switching on PASM Sport modef Press PASM button in the center console.
When PASM Sport mode is switched on, the
light-emitting diode in the button is lit up and a
message is shown on the on-board computer.Switching off PASM Sport modefPress PASM button in the center console.
The light-emitting diode in the button goes out
and the on-board computer displays a
message.
After the ignition is switched off, PASM is
automatically reset to Normal mode.
Porsche Active Suspension
Management (PASM)

Operation, Safety
67
Rear Spoiler The rear spoiler improves driving stability, espe-
cially at higher speeds.
Warning!
Risk of accident, resulting in serious perso-
nal injury or death.
If the spoiler cannot be extended, driving sta-
bility will be adversel y affected by increased
rear axle lift, which could lead to loss of con-
trol.
f Adapt your driving style and speed to the
changed driving conditions.
f Have the fault remedied at an authorized
Porsche dealer.
Risk of injury during manual retraction or
extension of the spoiler with the vehicle
stationary.
f Make sure that no persons or objects are
within the range of movement of the rear
spoiler.
Risk of damage from pushing the vehicle by
the rear spoiler.
f Do not push the vehicle at the rear spoiler.
Automatic control
(automatic mode)The rear spoiler extends at approx. 75 mph
(120 km/h) and retracts again at approx. 50 mph
(80 km/h).
If the automatic control fails, the warning light
lights up.
The warning light in the on-board computer lights
up when the rear spoiler does not extend over
75 mph (120 km/h) or its end position is not
reached.
Manual control
(manual mode)When the ignition is on, the rear spoiler can be
extended and retracted manually using the button
in the center console.
Note
When the rear spoiler is extended manually, the au-
tomatic control does not operate and the rear
spoiler must be manually retracted.
Warning light

68
Operation, Safety
Extending
f
Press button briefly.
The spoiler extends to its final position.
The light-emitting diode in the button lights up.
The rear spoiler remains extended even after
switching off ignition.
Retracting
f at speeds between 0 and 20 mph
(0 and 30 km/h):
Press and hold button until the rear spoiler has
reached its final position.
The light-emitting diode in the button goes out.
The rear spoiler changes to automatic mode. f
at speeds between 20 and 60 mph
(30 and 100 km/h):
Press button briefly.
The rear spoiler retracts, the light-emitting
diode in the b utton goes out.
The rear spoiler changes to automatic mode.
f at speeds over 60 mph (100 km/h):
Press button briefly.
The rear spoiler remains extended, the light-
emitting diode in the button goes out.
The rear spoiler changes to automatic mode.
Manually retracting an extended rear spoiler
after switching on the ignition again
1. Press button briefly. The light-emitting diode in the button lights up.
The rear spoiler is now in manual mode.
2. Press and hold button until the rear spoiler has reached its final position.
The light-emitting diode in the button goes out.
The rear spoiler changes to automatic mode.
Fixed rear spoiler
Caution!
Risk of damage to rear spoiler.
f Please consult the operator before using auto-
matic car washes.
fDo not push the vehicle by the spoiler.