I've heard that a lot of people have trouble with this type of change...
while I haven't had anything personal to do with something like this, I
can't see why problems are encountered. But let's make a paragraph just to
hedge my bets and give some insight into the system.... Yours will be the
valve stem sensors.
We are told that tire rotation has no effect on these sensors... but there
is some fallacy to that statement. When the vehicle is at rest, the sensors
report back to the module every few hours (sorry, I can't remember the exact
time frame). Once vehicle speed exceeds 20 mph, the sensors report every 60
seconds.... I can't find anything that tells me if this change is caused by
VSS readings or by centrifugal force....(in case a wheel diameter change is
in your plan). I can't see a big concern in either case.
What I see as being some of the biggest problems is with both tire shops and
dealer techs not having a full understanding of these systems. Having said
that, I'll try to list out all of the cautions I can find and remember.....
The first one that comes to mind is the valve cores.... don't even attempt
to remove them.... They will be destroyed in the attempt and the only sure
cure after that is a new stem/transponder. The cores are "special" to
eliminate corrosion since, along with the stem, they form the antenna of the
transponder. Changing to a conventional core an affect antenna "trim" which
could damage the transponder or otherwise affect the operation of the
transponder. The correct way to deflate a tire with these transponders is to
deflate the tire with a tire chuck (not the best way) or to remove the nut
and push the stem inside the tire ( a new o-ring will be required). In
either case, great care will be needed to avoid damaging the transponder
during bead breaking and tire demounting.
There are two different sensors available for this style system.... they are
NOT interchangeable...
These sensors report tire pressure to the module which decides if the
pressure is too low according to preset parameters. Setting all four tires
at the same pressure may not be enough.... these pressures will have to be
above the trigger point for low pressure warnings. Sorry, I just don't know
what these low limits are....
After replacement, it should not be necessary to retrain the transponders to
the module.
HTH
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