Using Snow Chains; Tyre Pressure Monitoring System - Ford Fiesta Owner's Manual

If winter tyres are used, you must make
sure that you use the correct tyre
pressures. See Technical Specifications
(page 179).

USING SNOW CHAINS

WARNINGS
Do not exceed 30 mph (50 km/h).
Do not use snow chains on snow-free
roads.
Only fit snow chains to specified
tyres. See Technical
Specifications (page 179).
If your vehicle has wheel trims,
remove them before fitting snow
chains.
Only use snow chains of 10 millimetres or
smaller.
Only use snow chains on the front wheels.
Note: The anti-lock braking system will
continue to operate normally.
Vehicles with Stability Control
When stability control is on, your vehicle
may exhibit some unusual driving
characteristics. To reduce this, switch
traction control off. See Using Stability
Control (page 114).
TYRE PRESSURE
MONITORING SYSTEM
WARNINGS
The system does not relieve you of
your responsibility to regularly check
the tyre pressures.
Wheels and Tyres
Under-inflation reduces fuel efficiency, tyre
tread life and may also affect your ability
to drive your vehicle safely.
The deflation detection system will alert
you if there is a change of air pressure in
any tyre. It does this by using the anti-lock
braking sensors to detect the rolling
circumference of the wheels. When the
circumference changes, this indicates low
tyre pressure. A warning message is
displayed in the information display and
the message indicator will illuminate. See
Information Messages (page 66).
If a low pressure warning message is
displayed in the information display, check
the tyre pressures as soon as possible and
inflate them to the recommended
pressure. See Technical Specifications
(page 179).
If this happens frequently, have the cause
determined and rectified as soon as
possible.
Apart from a too low tyre pressure or a
damaged tyre, the following situations can
affect the rolling circumference:
•
•
•
•
174
WARNINGS
The system will only provide a low
tyre pressure warning. It will not
inflate the tyres.
Do not drive on significantly
under-inflated tyres. This may cause
the tyres to overheat and fail.
Do not bend or damage the valves
when you are inflating the tyres.
Have tyres installed by an authorised
dealer.
Vehicle load is uneven.
When using a trailer or travelling up and
down an incline.
Using snow chains.
Driving on soft surfaces such as snow
or mud.