BENDIX SmarTire Operator's Manual page 13

Now consider an example where the tire is low. Again, due to this natural
increase in pressure due to temperature as the tire warms up, the actual air
pressure of the tire may appear to be correct
85
because it is at 110 PSI which is the correct CIP, but 1
°F
in reality due to the increased temperature of the tire,
110
- 5
the pressure is actually 5 PSI low. The image to the
psi
psi
right shows what would be shown on the display.
The pressure deviation value would indicate the
amount of under inflation based on the temperature compensated value as
described above. In this case, the Deviation Value is shown as - 5, meaning
the tire is 5 psi low and should inflated to 115 PSI. If this value were +5, the
tire would be 5 PSI high for this temperature.
The Pressure Deviation value is a useful tool in maintaining tire
pressures as it takes the guess work out of inflating tires, simply add
the amount of air indicated until this value is 0 and your tires will be
properly inflated!
BW8002 Page 13