Bendix Commercial Vehicle Systems SmarTire Trailer-Link Op Manual - Manual (Page 46)

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7.2 SmarTire ® TPMS System Q&A
7.2.1 Q: 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.
7.2.2 Q: 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 Trailer-Link ™ ECU having been updated. To correct this, follow
the steps in Section C, 4.2.3 in combination with the SmarTire ® TPMS
Maintenance Hand tool to relearn sensors into their correct tire positions.
7.3 Diagnosing 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.
Figure 47
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,