Lexus SC 430 2006 Owner's Manual page 234

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Inspection and adjustment procedure
Remove the tire valve cap.
Press the tip of the tire pressure gauge to the tire valve.
Read the pressure using the graduations on the gauge.
If the tire inflation pressure is not within recommended levels,
inflate the tire.
If you add too much air, press the center of the valve to lower.
After completing tire inflation pressure measurement and adjust-
ment, apply soapy water to the valve and check for leakage.
Reinstall the tire valve cap.
4-3. Do-it-yourself maintenance
Tire valve
1
Tire pressure gauge
2
4
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