traction control JAGUAR XJ 2004 X350 / 3.G Owners Manual

3 - 12 Before Driving
Seat belt fitting
!WARNING:
Do not adjust the seat belt while
driving.
Draw the tongue of the seat belt over the
shoulder, across the chest and push it
into the buckle unit slot. A positive ‘click’
indicates that it is safely locked.
Comfort clips or devices that create slack
in the seat belts are not recommended. Ensure that the webbing is midway
between the neck and the edge of the
shoulder. Correct tension is controlled by
automatic retraction of the reel.
A warning light on the instrument panel
is illuminated when the driver’s seat belt
is not fastened.
Note:
If the vehicle is parked on unlevel
ground, the seat belt mechanism may
lock. This is not a fault, gently ease the
belt from its attachment to unlock it.

On the Road 4 - 45
Limp-home mode
In the unlikely event of an electrical or
mechanical failure, transmission
operation will be impaired. The vehicle
gear selector ranges P, R, N, D can still be
used to enable the vehicle to be driven to
a safe area. In this event consult a Jaguar
Retailer immediately.
!WARNING:
The driver should be aware that the
vehicle’s performance will be
reduced and must take this into
account when driving.
Sport Mode
The switch marked ‘S ’ on the ‘J’-gate
surround enables the driver to select
either normal or sport (S) modes.
When sport mode is selected the
automatic transmission will operate
normally, but the ge arshift points are
extended to make full use of the engine’s
power reserves.
To select ‘Sport’, press the switch. A red
light within the switch is illuminated to
indicate that sport mode has been
selected.
To cancel ‘Sport’, 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 norm al and sport modes,
the transmission control computer 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.
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.
Note: Under the conditions described,
the relevant transmission mode will
override the normal or sport modes
selected by the driver.
When such conditions no longer exist,
the transmission will revert to the shift
pattern previously selected by the driver,
that is, normal or sport.

4-46 On the Road
Dynamic Stability
Control (DSC)
Unless it has been switched off, dynamic
stability control is operational whenever
the engine is running. If the system is
operating, the warning light in the
instrument cluster 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/ov ersteer). It applies
braking pressure to individual wheels if
excessive variation is detected.
This ensures that the vehicle follows the
driver’s intended direction of travel.
Traction control will intervene to reduce
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 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 light in the instrument
cluster will flash.
The dynamic stability control system can
be switched OFF by pressing the switch
on the centre console switchpack.
The warning light in the instrument
cluster will remain on and a message 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 the
message:
DSC NOT AVAILABLE
Warning light: Amber .
and the instrument cluster DSC warning
light will 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 Retailer as soon as possible.
!WARNING:
1. The fact that the vehicle is fitted with Dynamic Stability Control
must never allow th e driver to be
tempted into taking risks which
could affect his/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.
2. It is recommended that when using snow chains, DSC should be
switched OFF.

7-20 Maintenance
United States Department of
Transportation/Uniform Tyre Quality
Grades
The following information relates to the
tyre grading system developed by the
National Highway Traffic Safety
Administration which will grade tyres by
tread wear, traction and temperature
performance.
Tread wear
The tread wear grade is a comparative
rating based on the wear rate of the tyre
when tested under controlled conditions
on a specified government test course.
For example, a tyre graded 150 would
wear one and a half (1.5) times as well on
the government course as a tyre
graded 100.
The relative performance of tyres
depends upon the actual conditions of
their use, however, and may depart
significantly from the norm due to
variations in driving habits, service
practices and differences in road
characteristics and climate. Traction – A, B, C
The traction grades, from the highest to
the lowest are ‘
A’, ‘ B’ and ‘ C’, and they
represent the tyre’s ability to stop on wet
pavements as measured under controlled
conditions on specified government test
surfaces of asphalt and concrete. A tyre
marked ‘ C’ may have poor traction
performance.
!WARNING:
The traction grade assigned to this
tyre is based on braking (straight
ahead) traction tests and does not
include cornering (turning) traction. Temperature – A, B, C
The temperature grades ‘
A’ (the highest),
‘ B ’ and ‘C ’ representing the tyre’s
resistance to the generation of heat and
its ability to dissipate heat when tested
under controlled conditions on a
specified indoor laboratory test wheel.
Sustained high temperature can cause the
material of the tyre to degenerate and
reduce tyre life, and excessive
temperature can lead to sudden tyre
failure.
The grade ‘ C’ corresponds to a level of
performance which all passenger car
tyres must meet under the Federal Motor
Vehicle Safety Standard No. 109.
Grades ‘ B’ and ‘ A’ represent higher levels
of performance on the laboratory test
wheel than the minimum required by
law.
!WARNING:
The temperature grade for this tyre is
established for a tyre that is properly
inflated and not over loaded.
Excessive speed, under-inflation or
excessive loading, either separately
or in combination, can cause heat
build-up and possible tyre failure.