What should I do if the tyre pressure warning light comes on? A tyre with less air pressure will have a smaller circumference and therefore spin at a faster rate than a wheel that has not lost air pressure.ĭata from the wheel speed sensors is communicated directly to the ABS control unit, which prompts a visible alert for the driver if any wheel speed abnormalities are detected. This model is equipped with an indirect system, which uses the existing wheel speed sensors within the anti-lock braking system to ‘measure’ tyre pressure by detecting differences in the rate of wheel rotation. The only exception within Toyota’s passenger car line-up is the Proace Verso MPV. Direct systems are installed in the majority of Toyota’s current passenger car line-up, and this method uses a battery-powered sensor integrated into the valve assembly (see images below) to physically measure air pressure from within the tyre cavity itself. There are two types of TPMS: direct and indirect. How does a Tyre Pressure Monitoring System work? Prevents accidents caused by a critical decrease in tyre pressure.Tyres represent the only contact your vehicle has with the ground, so maintaining the correct tyre pressure has many safety and efficiency benefits. It comes from the Tyre Pressure Monitoring System (TPMS), an active safety technology that has become a legal requirement for all newly launched and factory updated passenger cars sold in Europe since November 2014. The warning light is an alert message to the driver that there may be a loss of air pressure from one or more of the vehicle’s tyres.
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