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Tire Pressure Monitoring System - TPMS

Discussion in 'Stock 2011 - 2019 Ford Explorer Discussion' started by Justyman87, September 29, 2012.

^^Searches ExplorerForum.com^^



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  1. gatzdon

    gatzdon Active Member

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    I cannot speak about all vehicles with absolute certainty, but on my '12 Explorer and most vehicles in general, the TPMS sensors do not start transmitting until the vehicle is travelling fast enough (about 20mph). This is to preserve battery life. The sensor has a switch that requires a minimum centrifugal force to close the switch and turn on the sensor.

    That said, I can see all sensors and sensor values on my '12 Ex using Forscan Lite. There are only four sensor inputs for the four wheels. Forscan Lite would be a quick and easy way to see which sensor is reporting a fault or low pressure. The sensor location in the TPMS is dependent on the four sensors being trained in the correct order at your last tire rotation.

    Faults that don't stay with a single sensor are indicative of RF interference.
     
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  3. peterk9

    peterk9 Staff Member Moderator Elite Explorer

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    When I was active in the Toyota forum there were several instances where a TPMS fault was indicated and was traced back to the spare.

    Peter
     
  4. gatzdon

    gatzdon Active Member

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    If the spare tire is on our Explorers, you will get a TPMS fault because it won't see one of the sensors (the tire that's not on the vehicle).

    But you did get me to search and I see that there are more expensive bi-directional TPMS systems that would allow for the ability to monitor the spare tire (the vehicle sends a signal to wake up the sensor to get a reading).

    I couldn't find any specific vehicles that have this. As far as I know, our sensors are one way and don't start broadcasting the pressure until you are going more than 20mph.

    In the TPMS module, using Forscan Lite, I only see sensors for the four corners of the vehicle.
     
  5. peterk9

    peterk9 Staff Member Moderator Elite Explorer

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    Our spares do not have sensors and are designed for short trips only. From what I've read here, the spare usually is inflated with a higher PSI. Of course that doesn't guaranty it won't lose air, or worse yet, go flat when it's needed.;)

    Peter
     
  6. expoman55

    expoman55 Elite Explorer

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    Do I remember somewhere in the threads( I tried search ) that on the 2015 although it is not displayed the low tire or tire pressures/data are maintained in the computer and Forscan logs
     
  7. thefranchise713

    thefranchise713 Well-Known Member

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    ^ Yes, in FORScan you will need to query the BCM, there are PIDs that correspond to each sensor.
     

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