"AS" <donot (AT) spame (DOT) com> wrote

The Nissan system uses transmitters in the tire.

The systems that work on variations in tire rotation aren't very
accurate. I had a 2001 Mustang with ABS and if you had a tire that was
significantly under inflated, it would cause the ABS system
malfunction indicator light to come on. I had a tire with a slow leak
and I could count on the ABS light alerting me when it got
significantly lower than normal. I know this was not a smart thing to
do (ride around with a tire that had a slow leak). I had ordered new
replacement tires and was just waiting for them to arrive. GM cars
that used the ABS systems to detect under inflation required a
significant learning period. They do work, but I am not sure they work
well enough to improve safety. I also think system that use ABS sensor
require four channel ABS (a sensor on every wheel) instead of the
three channel systems used on many rear wheel drive light trucks.

Ed