Mazda mx5 Owner's Manual page 255

NOTE
Because this system detects slight changes in tyre conditions, the timing of the warning
may be faster or slower in the following cases:
The size, manufacturer, or the type of tyres is different from the specifi cation.
The size, manufacturer, or the type of a tyre is different from the others, or the level of
tyre wear is excessively different between them.
A run-fl at tyre, studless tyre, snow tyre, or tyre chains are used.
An emergency tyre is used (The tyre pressure monitoring system warning light may
fl ash and then continue illuminating).
A tyre is repaired using the emergency fl at tyre repair kit.
The tyre pressure is excessively higher than the specifi ed pressure, or the tyre pressure
is suddenly lowered for some reason such as a tyre burst during driving.
The vehicle speed is lower than about 15 km/h (9.3 mph) (including when the vehicle
is stopped), or the drive period is shorter than 5 minutes.
The vehicle is driven on an extremely rough road or a slippery, icy road.
Hard steering and rapid acceleration/deceleration are repeated such as during
aggressive driving on a winding road.
Load on the vehicle is applied to a tyre such as by loading heavy luggage to one side of
the vehicle.
System initialization has not been implemented with the specifi ed tyre pressure.
Tyre Pressure Monitoring System
When Driving
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