Toyota 2015 Prius Owner's Manual page 478

4-3. Do-it-yourself maintenance
Inspection and adjustment procedure
■
Remove the tire valve cap.
STEP 1
Press the tip of the tire pressure gauge onto the tire valve.
STEP 2
Read the pressure using the gauge gradations.
STEP 3
If the tire inflation pressure is not at the recommended
STEP 4
level, adjust the pressure.
If you add too much air, press the center of the valve to
deflate.
After completing the tire inflation pressure measurement
STEP 5
and adjustment, apply soapy water to the valve and check
for leakage.
Put the tire valve cap back on.
STEP 6
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PRIUS_OM_OM47A17U_DVD_(U)
Tire valve
Tire pressure gauge
ITO43P117