Jaguar S-Type. Manual - part 32

Transmission

136

To select Sport mode, press the switch. A
red light within the switch is illuminated to
indicate that Sport mode has been
selected.

To cancel Sport mode, press the switch
again.

Note: Both sides of the J-gate can be
used irrespective of the transmission
mode, e.g. with S selected the
transmission can be operated in full
automatic or by manual selection.

In addition to the switched transmission
modes (N and S), the transmission control
module will select shift patterns to suit
specific conditions.

Cruise control – When cruise control is
operating at set speed, the transmission
selects a shift pattern to suit cruise
control operation.

Dynamic Stability Control (DSC) – When
DSC is switched ON and the system is
activated, the transmission selects a shift
pattern to suit traction control conditions.

Gradients – When the vehicle is being
driven on roads with uphill gradients, the
transmission adapts the shift pattern to
make better use of engine power and aid
engine cooling.

Under the conditions described above,
the relevant transmission mode will
override the N or S modes selected by the
driver. When such conditions no longer
exist, e.g. Cruise Control switched OFF,
the transmission will revert to the shift
pattern previously selected by the driver,
i.e. N or S.

Final drive unit

Caution: Although the final drive unit is
a fill-for-life unit, if your vehicle is used
for a race event or test track day, then
following the event the final drive unit
lubricant should be changed. Contact
your Jaguar Dealer.

137

Braking System

Braking System

ANTI-LOCK BRAKING SYSTEM
(ABS)

This system helps to prevent the road
wheels from locking and skidding during
emergency braking, assisting the driver to
maintain full steering and directional
stability.

The factor controlling ultimate stopping
distance and cornering ability is tire and
road adhesion.

WARNING:

• It remains the driver’s responsibility

to drive safely according to
prevailing conditions.

• The fact that a vehicle is fitted with

ABS must never allow the driver to
be tempted into taking risks which
could affect his or her safety, or
that of other road users.

• The addition of ABS cannot

overcome the consequences of
trying to stop in too short a
distance, cornering at too high a
speed, or the risk of aquaplaning.

• The driver should always take road

conditions into account. A slippery
road surface always requires more
braking distance for a given speed,
even with ABS. A possible increase
in stopping distance compared to
locked wheels may occur during
ABS operation on slushy snow,
gravel, sand, or some heavily
corrugated or ridged warning
sections of road surfaces.

ABS optimises tire to road adhesion
under maximum braking conditions,
though it cannot provide increased
cornering ability.

There is no need for special braking
techniques, such as pumping the brakes,
to achieve optimum braking distances
and control on poor or slippery road
surfaces. Tires must be in good condition
to achieve maximum adhesion.

During normal braking the ABS will not be
activated. However, if the braking force
applied begins to exceed tire and road
adhesion, the ABS will automatically
activate preventing the road wheels from
locking.

In these circumstances, a pulsating effect
will be felt from the brake pedal indicating
that the system is functioning. The
pulsating effect is due to small
fluctuations in pressure, supplied to the
brakes by the system to maintain full tire
and road adhesion.

Under severe braking on some road
surfaces, tire noise may be apparent ,
even though the wheels will at no time
become locked.

ABS Monitoring

The ABS control module monitors the
ABS electrical system from ignition switch
ON to ignition switch OFF. Any
malfunction will be indicated by the
anti-lock warning indicator coming on.

Should a fault develop in the ABS system,
the brake system will still operate
conventionally and with the same
standard of performance as vehicles not
equipped with ABS.

Caution: Consult a Jaguar Dealer
immediately if the warning indicator
comes on while driving; a system
failure is indicated.

Braking System

138

Emergency Brake Assist (EBA)

The EBA system measures the rate at
which the brake pressure increases. If the
system detects an emergency braking
situation, EBA automatically initiates the
full braking effect. This can reduce
stopping distances in critical situations,
which can help an inexperienced driver to
stop in the same distance as an
experienced driver.

WARNING:

The EBA system is an additional safety
system; it is not intended to relieve the
driver of his or her responsibility for
exercising due care and attention when
driving.

Advice on ABS braking techniques

For optimum ABS performance, these
instructions on braking techniques during
ABS operation should be followed:
• Do not release brake pressure when

the pulsating effect is felt. Maintain a
constant pressure until the
manoeuvre is completed.

• To familiarise yourself with the feel of

the brake pedal during ABS braking,
practise an emergency stop
procedure, always making sure it is
safe to do so. With the seat belts fitted
to all occupants, drive the vehicle at
32 km/h (20 mph) and brake sharply.

• ABS enables the driver to steer

around obstacles during emergency
braking. However, the consequences
of turning sharply at high speed
cannot be overcome by the ABS.

• Do not attempt to pump the brakes to

avoid skidding, as this can interfere
with the ABS operation. The ABS will
not allow the wheels to skid under
normal road conditions.

• The ABS will tend to keep the vehicle

straight during braking. Braking
distances may increase under certain
road conditions. It is, therefore,
necessary to plan and make turning
manoeuvres as early as possible.

139

Stability Control

Stability Control

DYNAMIC STABILITY
CONTROL (DSC)

Dynamic Stability Control is operational
whenever the engine is running, unless it
has been switched off. If the system is
operating, the warning indicator in the
instrument pack will flash.

The DSC system controls the Anti-lock
Braking System (ABS), traction control
and yaw control of the vehicle.

Yaw control determines the vehicle’s
direction relative to the driver’s inputs
(sideslip and under/oversteer). It applies
braking pressure to individual wheels if
excessive variation is detected. This
makes sure that the vehicle follows the
driver’s intended direction of travel.

Traction control will intervene to prevent
wheel spin, by automatically reducing the
power output from the engine and
applying braking to individual wheels.

This improves acceleration, particularly
on surfaces with uneven friction; for
example, one wheel on ice and the other
on tarmac.

ABS helps to prevent the road wheels
from locking and skidding during
emergency braking. When the system is
operating, the warning indicator in the
instrument pack will flash.

The Dynamic Stability Control system can
be switched OFF by pressing the switch
on the center console. The warning
indicator in the instrument pack will
remain on and a message DSC OFF will
be shown to indicate that the system has
been switched OFF. If the switch is
pressed again the system will switch ON.

Note: If cruise control is engaged it will
automatically disengage if stability control
activates.

A system malfunction is indicated by an
amber warning indicator and the message
DSC NOT AVAILABLE displayed in the
message center.

The instrument pack warning indicator
will also be lit.

It is safe to drive the vehicle, but the
system may not activate under wheel spin
or slide conditions. Report the fault to a
Jaguar Dealer as soon as possible.

WARNING:

• The fact that the vehicle is fitted

with Dynamic Stability Control must
never allow the driver to be
tempted into taking risks which
could affect his or her safety, or
that of other road users. In all cases
it remains the driver’s responsibility
to drive safely according to the
prevailing conditions.

• It is recommended that when using

snow chains, DSC should be
switched OFF.

When DSC is switched ON and the
system is activated, the transmission
selects a shift pattern to suit traction
control conditions.

Content .. 30 31 32 33 ..