Jaguar XJ (2008 year). Manual — part 63

253

Wheels and Tires

R

Tire pressures during long term vehicle
storage

To minimise the possibility and effects of
flat spots during storage, the tires may be
inflated to the maximum pressure
indicated on the tire wall.

Note: Before using the stored vehicle on
the road again, ensure that correct tire
pressures are restored.

TIRE PRESSURE MONITORING
SYSTEM (TPMS)

!

WARNING:

The Tire Pressure Monitoring System
(TPMS) is NOT a substitute for
manually checking tire pressures. Tire
pressures, including the spare wheel,
should be checked regularly, when
cold, using an accurate pressure
gauge and inflated to the correct
pressure. Failure to properly maintain
your pressures could increase the risk
of tire failure, with consequential loss
of vehicle control and personal injury.

!

WARNING:

The TPMS cannot register damage to a
tire. Regularly check the condition of
your tires.

Note:

1. Non-approved accessories may

interfere with the system. If this
occurs, TIRE PRESSURE SYSTEM
FAULT is displayed in the message
centre.

2. Certain tires may affect the

performance of the TPMS. Always
replace tires in accordance with
recommendations, see page 249.

JAG0653

Wheels and Tires

254

L

Wheels fitted with TPMS can be easily
visually identified by the external metal
lock nut and valve (1). All Jaguar
non-TPMS wheels have a rubber valve
fitted (2).

The TPMS monitors pressure in each tire
including the full size spare tire
(temporary-use spare wheels are not
fitted with sensors and are consequently
not monitored).

TPMS operation

The TPMS monitors pressure of the tires
via sensors located in each wheel and a
receiver located within the vehicle.
Communication between sensor and
receiver is via Radio Frequency (RF)
signals. The tire pressure warning
comprises a yellow telltale indicator within
the instrument pack and an associated
message within the message centre.

Each tire, including the spare (if provided),
should be checked monthly when cold
and inflated to the inflation pressure
recommended by the vehicle
manufacturer on the vehicle placard or
tire inflation pressure label. (If your vehicle
has tires of a different size than the size
indicated on the vehicle placard or tire
inflation pressure label, you should
determine the proper tire inflation
pressure for those tires.)

As an added safety feature, your vehicle
has been equipped with a tire pressure
monitoring system (TPMS) that
illuminates a low tire pressure telltale
when one or more of your tires is
significantly under-inflated.

Accordingly, when the low tire pressure
telltale illuminates, you should stop and
check your tires as soon as possible, and
inflate them to the proper pressure.
Driving on a significantly under-inflated
tire causes the tire to overheat and can
lead to tire failure. Under-inflation also
reduces fuel efficiency and tire tread life,
and may affect the vehicle’s handling and
stopping ability.

1

2

E86408

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Wheels and Tires

R

Note: Please note that the TPMS is not a
substitute for proper tire maintenance,
and it is the driver’s responsibility to
maintain correct tire pressure, even if
under-inflation has not reached the level
to trigger illumination of the TPMS low tire
pressure telltale.

The warning comprises the
TPMS telltale and the amber
priority warning indicator within

the instrument pack and an associated
message within the message centre, see
page 123.

Caution: When inflating tires, care
should be taken to avoid bending or
damaging the TPMS valves. Always
ensure correct alignment of the
inflation head to the valve stem.

Your vehicle has also been equipped with
a TPMS malfunction indicator to indicate
when the system is not operating
properly.

The TPMS malfunction indicator is
combined with the low tire pressure
telltale. When the system detects a
malfunction, the telltale will flash for
approximately one minute and then
remain continuously illuminated. This
sequence will continue upon subsequent
vehicle start-ups as long as the
malfunction exists. When the malfunction
indicator is illuminated, the system may
not be able to detect or signal low tire
pressure as intended.

TPMS malfunctions may occur for a
variety of reasons, including the
installation of replacement or alternate
tires or wheels on the vehicle that prevent
the TPMS from functioning properly.
Always check the TPMS malfunction
telltale after replacing one or more tires or
wheels on your vehicle to ensure that the
replacement or alternate tires and wheels
allow the TPMS to continue to function
properly.

A text message will accompany the
system malfunction and will display TIRE
PRESSURE SYSTEM FAULT.

Tire pressures

To correctly set the tire pressures, see
page 249.

Spare tire pressure: The full size spare
tire should be inflated to the highest
pressure for the specified tire size.

Full size spare wheel and tire change

Should it be necessary to change a wheel
and tire with the spare then the system
will automatically recognise the change in
wheel positions. The vehicle needs to be
stationary for 15 minutes during the wheel
and tire change before the system is
ready to detect the change in positions.
The vehicle must be driven for a minimum
of fifteen minutes after a tire change, and
then remain stationary for fifteen minutes
to activate full TPMS operation. After
driving above 25kph (18mph) any
deflation warning will clear typically within
5 minutes.

Wheels and Tires

256

L

If a wheel and tire needs changing

If the temporary-use spare wheel is fitted
the system will automatically recognise
the change in wheel positions. Then after
approximately ten minutes of driving
above 25 km/h (18 mph), a message TIRE
PRESSURE SENSOR FAULT will be
displayed accompanied by illumination of
the warning tell-tale and the amber
priority warning indicator.

The warning telltale will initially flash and
will subsequently revert to continuous
illumination. Extended use of the
temporary-use spare wheel will produce
an additional text message TIRE
PRESSURE SYSTEM FAULT.

This TPMS display sequence will be
activated at every ignition cycle until the
temporary-use spare wheel is replaced by
a fully operational full size wheel and tire
assembly.

Always replace the temporary-use wheel
before having TPMS faults investigated.
The fault may well be rectified with the
fitment of a fully operational full size
running tire in lieu of the temporary-use
spare wheel assembly.

Tire changing

Always have your tires serviced or
changed by a qualified engineer.

Care must be taken to avoid contact
between the bead of the tire and the
sensor during removal and refitting of the
tire, otherwise the sensor may become
damaged and or inoperable.

Caution: Valve stem seal, washer, nut,
valve core and cap should be replaced
at every tire change. Valve stem seal,
washer and nut must be replaced if
valve retention nut is loosened. Sensor
units and nuts must be refitted using
correct torque figures and associated
profile. Damage to the vehicle may
result if these precautions are not
taken.

Sensors can be removed from the wheel
by the unscrewing of the valve retention
nut.

Replacement sensor

Should the sensor require replacing, it
should be carried out by a Jaguar Dealer.

A replacement sensor must be fitted to a
running wheel in order to be recognised
by the TPMS. The vehicle needs to be
stationary for 15 minutes during the
sensor fitment before the system is ready
to detect the new sensor. The vehicle
must be driven for a minimum of fifteen
minutes after the sensor change, and then
remain stationary for fifteen minutes to
activate full TPMS operation.

If the TPMS warning for any wheel does
not clear, even after ensuring correct
inflation and driving for more than ten
minutes above 25 km/h (18 mph), you
should seek qualified assistance as soon
as possible.