Driving -> Under-inflation detection for Your Citroen C3 Aircross SUV First Generation (2017-2023)

Driving  
Restarting the engine (START mode)  
The engine automatically restarts as soon as  
the driver indicates the intention of moving off  
again, with the clutch pedal fully pressed.  
Driving with under-inflated tyres, particularly  
in adverse conditions (heavy load, high  
speed, long journey):  
Overspeed alert  
An audible overspeed alert is triggered  
when the vehicle exceeds predefined speed  
thresholds.  
– worsens road-holding.  
– lengthens braking distances.  
– causes premature wear of the tyres.  
– increases fuel consumption.  
Special cases  
When the vehicle speed is greater than 80  
km/h, the alert is emitted once in 2 minutes if  
the vehicle speed is maintained at 80 km/h.  
When the vehicle speed is greater than 120  
km/h, the alert is emitted every 2 seconds.  
The engine will restart automatically if the  
conditions for operation are met again and in  
the following cases:  
– Vehicle speed exceeds 5 km/h.  
– Some specific conditions (braking assistance,  
air conditioning setting, etc.).  
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.  
This system cannot be modified nor  
deactivated.  
In these cases, this indicator lamp flashes  
for a few seconds, then goes off.  
Under-inflation detection  
Malfunctions  
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.  
This system automatically checks the pressures  
of the tyres while driving.  
In the event of a malfunction, the button’s  
indicator lamp flashes briefly, then remains on.  
Have it checked by a CITROËN dealer or a  
qualified workshop.  
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.  
The vehicle stalls in STOP mode  
All of the instrument panel warning lamps  
come on if there is a fault.  
►ꢀ Switch off the ignition then start the engine  
again.  
Under-inflation alert  
It is signalled by the fixed illumination of  
this warning lamp.  
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.  
12 V battery  
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.  
The Stop & Start system requires  
a 12 V battery of specific technology and  
specification.  
All work must be carried out only by a  
CITROËN dealer or a qualified workshop.  
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Driving  
panel indicating that there is a temporary or  
permanent failure.  
Have it checked by a CITROËN dealer or a  
qualified workshop.  
►ꢀ Reduce speed immediately, avoid excessive  
steering movements and avoid sudden braking.  
►ꢀ Stop the vehicle as soon as it is safe to do  
so.  
The system does not advise if a pressure is  
incorrect at the time of reinitialisation.  
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The reinitialisation of the system is done with  
the ignition on and the vehicle stationary.  
When this warning lamp is displayed on  
the instrument panel, make a long press  
on the "OK" button located on the steering  
wheel to reinitialise the system.  
The loss of pressure detected does not  
always cause visible bulging of the  
tyre.  
Malfunction  
Do not rely on just a visual check.  
The flashing then fixed illumination of the  
under-inflation warning light accompanied by  
the fixed illumination of the service warning  
light indicate a fault in the system.  
In this case, under-inflation monitoring of the  
tyres is no longer assured.  
►ꢀ Check the pressure of the corresponding  
tyre or of the four tyres when cold.  
A message is displayed on the  
instrument panel indicating that the  
reset has been completed.  
►ꢀ 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.  
If the damaged wheel is replaced with  
one that is not recommended, a  
message is displayed on the instrument  
panel indicating that a spare wheel is  
detected.  
Once the wheel is changed to a  
recommended one, the system must be  
reset.  
Have the system checked by a CITROËN dealer  
or a qualified workshop.  
The alert is kept active until the  
system is reinitialised.  
Parking sensors  
Reinitialisation  
The system must be reinitialised after any  
adjustment to the pressure of one or more  
tyres, and after changing one or more wheels.  
After an intervention of the CITROËN  
dealer for temporary or permanent  
failure, the system must be reset.  
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.  
When there is an error in the signal  
representing deflation or spare tyre, a  
message is displayed on the instrument  
Using sensors located in the bumper, this  
system signals the proximity of obstacles  
(e.g. pedestrian, vehicle, tree, barrier) present in  
their field of detection.  
Check the pressures of the four tyres before  
performing the reinitialisation.  
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