Here is the Readers Digest version of TPM on a newer Chrysler.
The sensors "should" be programmed into the wireless control module, wireless ignition node, or whatever it is called in your model truck. Having the ID code input into the module with the scan tool allows the module to identify the wheel position of each tire. But this is not always necessary as the module can identify the tire pressure being broadcast, but not the tire position. Low line monitors do not display the individual pressures on the dash, but they do display on the scan tool (assuming the position of each sensor was programmed). High line monitors that display the tire pressure of each tire have transducers in three of the wheel wells, and can identify the tire position even if rotated. Some vehicles have transmitters in the spare, and remember that dual rear wheels have six sensors. So there is capability in some modules to read five or six tires, but they have to be programmed.
The sensors go to sleep when not moving, but are also "woke" up at key on by the wireless module sending out a message. They also wake up when moving by the rotation of the tire. On a smart system the spare position is known by deduction because it is the one that wakes up at key on, but does not stay awake by rotating. So in theory you can have five sensors, but I have never tried to add one to a system that was not factory equipped with it. The reason you have to drive the at least ten minutes is to make sure the sensors are awake, and have sent messages to the wireless module a minimum number of times. Also the tire pressure thresholds must be set in the module to match the door sticker tire pressures. A wrong threshold setting can cause a TPM light to come on when a tire is not low.
Now here is the description from the FSM for 2008 DH.
The tire pressure monitoring system (TPMS) is designed to operate without loss of function for all OEM tire construction for this vehicle. Tire Pressure Monitoring Sensors, mounted to each road wheel as part of the valve stem, transmit an RF signal indicating their individual pressure to a receiver located in the Wireless Control Module (WCM), commonly referred to as the Sentry Key Remote Entry Module (SKREEM). These transmissions occur approximately once every minute at speeds over 15 mph (24 km/h). (Refer to 22 - TIRES/WHEELS/TIRE PRESSURE MONITORING/SENSOR - OPERATION). If the TPM system detects that the tire pressure in any road tire is going low, beyond the Low Pressure (lamp) ON threshold (see placard table below), the TPM system will continuously illuminate an indicator lamp. If a system fault is detected, the indicator lamp will flash on/off for 75 seconds and then remains on solid.
If the WCM detects a warning or fault condition at ignition key "on" it will wait ten seconds +/- 10 % before sending the first request to illuminate the yellow telltale. This will assure that the display module has concluded its bulb check period. The display module will request a chime once per ignition cycle for each "warning" or "fault" condition detected. A "warning" or "fault" condition will remain enabled until the problem causing the condition is corrected and removed/reset.
The WCM shall continuously monitor for the receipt of tire pressure RF message transmissions from the wheel sensors during both the ignition key "on" and key "off" cycles. The wheel sensor ID’s and the location of each sensor (e. g. Tire 1, Tire 2 etc. ) are stored in the WCM non-volatile memory during the initial Manufacturing Plant Process, or during a service procedure, as required.
The TPM System will continue to warn the driver of low tire pressure as long as the condition exists, and will not turn off the indicator lamp until the tire pressure is at or above the Low Pressure (lamp) OFF threshold (see placard table below). The system will automatically update and the TPM warning lamp will extinguish once the updated tire pressures have been received.
The tire pressure will vary with temperature by about 1 psi (6. 9 kPa) for every 12°F (6. 5°C). This means that when the outside temperature decreases, the tire pressure will decrease. Tire pressure should always be set based on cold inflation tire pressure (placard pressure). This is defined as the tire pressure after a vehicle has not been driven for more than 3 hours - and in outside ambient temperature. The tire pressure will also increase as the vehicle is driven - this is normal and there should be no adjustment for this increased pressure. For a system fault, the system will return to normal once the WCM receives a valid transmission from that sensor location.
For further information, refer to the Owners Manual or the Appropriate Diagnostic Information.
If equipped, some vehicles will have different recommended tire pressure values between the front and rear tires. The TPMS will distinguish between the front and the rear tire sensors by using transponders located in the front wheel wells on the vehicle.
These vehicles will also have a “Light Load” reset switch which will allow the driver to change between two different recommended “Placard Pressure”, “Low-pressure Threshold” and Hysteresis Pressure Values”. These values are stored in the WCM non-volatile memory during the initial Manufacturing Plant Process, or during a service procedure, as required. To determine the pressure thresholds for a vehicle, refer to the Tire Inflation Pressure (Placard) Label or Supplemental Tire Pressure Information Label, and then apply the placard pressure to the following table. The Low Pressure OFF Threshold is defined as the Low Pressure ON Threshold plus the Hysteresis Pressure Value
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