Tire Pressure Monitoring Systems

May 9, 2016

 

TPMS refers to the system now on the newer cars that monitor your tire pressure automatically. How does this work? There are 2 types of TPMS Systems DIRECT VS. INDIRECT

Direct Systems

 attach a pressure sensor/transmitter to the vehicle's wheels. An in-vehicle receiver warns the driver if the pressure in any tire falls below a predetermined level. Direct systems are typically more accurate and reliable and most are able to indicate which tire is under-inflated.

Indirect Systems
use the vehicle's anti-lock braking system's wheel speed sensors to compare the rotational speed of one tire versus the others. If a tire is low on pressure, it will roll at a different number of revolutions per mile than the other three and alert the vehicle's on-board computer. Indirect systems (except for the TPMS on several 2009+ Audi models and 2010+ Volkswagen models) are unable to generate accurate readings in cases where all four tires are losing pressure at the same rate, such as the effects of time and temperature.

#TPMS #Tire pressure monitor #correct tire inflation

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