7.2SmarTire® TPMS System Q&A
7.2.1Q: A trailer tire continues to show a deviation value/alert although it was aired up properly.
A:Set the Cold Inflation Pressure value (CIP) for each trailer axle to make sure it matches that of the intended inflation value for the tire in question. To do so, please refer to Section C, 4.2.2 as well as the inflation tables in
Section A under Section 1.4. If the CIP value is matched to the recommended inflation pressure for the vehicle and the prevailing ambient temperature but the deviation value continues to show up, the tire is exhibiting a slow leak. Take appropriate steps to have the tire inspected for any damage or leaks.
7.2.2Q: Pressure readings at a tire location do not change on the gauge when air is added, or removed, to correct tire pressure, and a new transmission has been received.
A:Wheel assemblies may have been relocated/rotated on the trailer without the SmarTire
7.3Diagnosing A Defective, Missing, Or Misplaced Sensor
In the event that a tire sensor does not report to the display after having gone through the steps above, the following sensor checks should also be performed:
a.Try to initiate the sensor opposite of the valve stem. There are times when the tire installer accidentally places the sensor 180 degrees opposite of the valve by misreading the instructions (sensors are required to be placed 180
degrees opposite of each other for dual wheel assemblies). Check for new data on the gauge for the affected wheel position.
b.If step a. was unsuccessful, try to initiate the sensor at the bottom of the wheel, no matter where the valve stem is located. If this attempt updated the display screen, rotate the wheel 180 degrees forward and initiate the sensor again at the BOTTOM of the wheel. If the second initiation also provided new data (cycle power between tries to empty the screen, not necessary when using SmarTire Maintenance Hand tool), it is evidence of a broken cradle and/or strap. The sensor is simply falling to the lowest point in the wheel after each rotation. Remove the tire and replace the cradle and strap. Depending on the damage done to the sensor itself,
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