Volvo S 90 Owner's Manual page 467

6. Tap the calibration button.
OK
7. Tap
after the tire pressure in all four tires
has been checked and adjusted.
8. Drive the vehicle.
> The calibration process will be completed
while driving and will be interrupted if the
vehicle is parked and the engine is
switched off. Calibration continues auto-
matically when driving resumes.
When enough data has been collected to detect
a low tire pressure situation, the tires' color in the
center display will change to green. The system
will not give any text confirmation when calibra-
tion is finished although it will state if calibration
fails. When driving with heavy loads or at sus-
tained highway speeds, the tire pressure should
be adjusted to the recommended inflation pres-
sures.
After adjusting inflation pressure, repeat steps
1-8.
NOTE
Always remember to calibrate the Tire Pres-
sure Monitoring System when the wheels
have been changed or the tire inflation pres-
sure has been corrected according to the tire
pressure decal or tire inflation pressure table.
If correct reference values have not been set,
the system cannot issue low tire pressure
alerts correctly.
The vehicle must be parked with the engine
running to access the calibration button and
to start the calibration process.
WARNING
The exhaust gases contain carbon monoxide,
which is invisible and odorless but very poi-
sonous. For this reason, always perform the
calibration procedure outdoors or in a work-
shop with exhaust gas evacuation equipment.
Related information
•
Tire Pressure Monitoring System (TPMS)
(p. 461)
WHEELS AND TIRES
465