Overspeed Alert; Under-Inflation Detection - CITROEN C3 Handbook

Overspeed alert

An audible overspeed alert is triggered
when the vehicle exceeds predefined speed
thresholds.
When the vehicle speed is greater than 80
km/h, the alert is emitted once.
When the vehicle speed is greater than 120
km/h, the alert is emitted every 2 seconds.
This system cannot be modified nor
deactivated.

Under-inflation detection

This system automatically checks the pressures
of the tyres while driving.
It compares the information given by the wheel
speed sensors with reference values, which
must be reinitialised every time the tyre
pressures are adjusted or a wheel changed.
The system triggers an alert as soon as it
detects a drop in the inflation pressure of one
or more tyres.
Under-inflation detection does not
replace the need for vigilance on the
part of the driver.
This system does not avoid the need to
regularly check the tyre pressures (including
the spare wheel) as well as before a long
journey.
Driving with under-inflated tyres, particularly
in adverse conditions (heavy load, high
speed, long journey):
– worsens road-holding.
– lengthens braking distances.
– causes premature wear of the tyres.
– increases fuel consumption.
The inflation pressures defined for the
vehicle can be found on the tyre
pressure label.
For more information on the Identification
markings, refer to the corresponding
section.
Checking tyre pressures
This check should be done when the
tyres are "cold" (vehicle stopped for 1 hour or
after a journey of less than 6 miles (10 km) at
moderate speeds).
Otherwise, add 0.3 bar to the pressures
shown on the label.
Under-inflation alert
It is signalled by the fixed illumination of
this warning lamp.
In addition, the following information is given in
the instrument panel:
When one tyre is deflated then the
corresponding tyre is blinking.
When more than one tyre is deflated then the
four tyres are blinking.
► Reduce speed immediately, avoid excessive
steering movements and avoid sudden braking.
► Stop the vehicle as soon as it is safe to do
so.
The loss of pressure detected does not
always cause visible bulging of the
tyre.
Do not rely on just a visual check.
► Check the pressure of the corresponding
tyre or of the four tyres when cold.
► If it is not possible to make this check
immediately, drive carefully at reduced speed.
► In the event of a puncture, replace the
punctured wheel by the spare wheel.
► Reinitialize the detection system after
adjusting the pressure.
The alert is kept active until the
system is reinitialised.
Reinitialisation
The system must be reinitialised after any
adjustment to the pressure of one or more
tyres, and after changing one or more wheels.
Before reinitialising the system, make
sure that the pressures of the four
tyres are correct for the conditions of use of
the vehicle and conform to the values
written on the tyre pressure label.
Check the pressures of the four tyres before
performing the reinitialisation.
Driving
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