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Replacing Damaged or Lost Sensor on TST TPMS TST-507-FT-6-C

Question:

What does the monitor display if it looses communication with a sensor while driving. Does it display the last reading or does it show blank?

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Expert Reply:

According to my contact at TST, there are two scenarios that would indicate a sensor failure on your TST TPMS # TST-507-FT-6-C.

If the battery is dead or sensor communication is interrupted temporarily, lines or dashes "---" are displayed for that sensor on the monitor. Since the battery life on the system can be anywhere from 12 to 18 months, this is unlikely. Also, the system automatically refreshes to display new information every 5 minutes, so the dashes would not be displayed for long once power is restored.

However, if the sensor becomes permanently separated, for example, if it gets blown off the wheel, then the monitor will freeze, displaying the last known reading. If that is the case, you can replace damaged or lost sensors with # TST-507-FT-S2, which includes two tire sensors.

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Question:

Hello, Carla. I appreciate your response but one part of your answer doesn't make sense to me. In the first scenario you said lost comms would be indicated by a dash. However in the second scenario the display should not be able to differentiate a missing sensor from lost comms? It would still only detect lost comms and show the same dash. How would it know the sensor is gone? Does that make sense?

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Expert Reply:

I understand what you're saying and why that would be confusing.

There is a difference between lost communication versus physical disconnection. One scenario is a slower, timed failure. The other is an immediate loss of signal. However, eventually, both scenarios will display dashes on the monitor. Anytime you see dashes, you should stop and inspect the sensor on that wheel, whether it be to replace the battery, or make sure it's still properly mounted. This is the only way to know for sure if the sensor is in fact gone.

When the display loses communication with a sensor (battery going dead, failed/intermediate reading sensor, valve core issue, etc.) there is a short time delay before dashes will be displayed on the monitor. The display keeps polling the sensor for data. No data is received but the sensor is still in range of the display.

If the sensor is operating correctly and is within the set range from the display and the sensor is violently blown off the valve stem or the wheel breaks away from the mounting studs and rolls away rapidly, the data on the screen will freeze. The sensor immediately goes out of transmission range, yet, before it disappeared, the sensor was within correctly set parameters. The display “thinks” the sensor is still within the normal operating parameters. Normally, after 15 minutes or so without a signal, the display will show the dashed lines.

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