TPMS Receiver Description and Operation

Description

1. 1
   Mode

   1. Commonwealth of Virginia
      • In this state, the receiver is shipped as a separate part. Therefore, service parts must arrive in this state.
      • In this state, there is no sensor monitoring and no DTC monitoring.
      • This state indicates that the platform parameters must be written to the receiver and the sensors are not memorized.
   2. Normal State
      • For the tire inflation and DTC monitoring state, the receiver must be in this state.
      • In this state, automatic sensor learning is enabled.
   3. Test State
      • This state is used only at the factory to check RF transmission between the sensor and the receiver.
2. 2
   Overview

   • Receives RF data from the sensor.
   • Uses sensor data to determine whether the TREAD lamp should be turned on.
   • Learn the TPMS sensor for automatic under-inflation monitoring.
   • Uses sensor information, distance traveled, background noise levels, auto-learn status, short/open circuit output status, vehicle battery charge level, and receiver internal states to determine whether there are system or vehicle malfunctions.

Operation

1. 1
   General Function

   • Auto-learn occurs only once per ignition cycle.
   • When successfully completed, 4 wheel sensor IDs are stored in memory for monitoring.
   • Until auto-learn is completed, previously learned sensors are monitored for underinflation/leak warnings.
2. 2
   General conditions for learning new sensors:

   • The receiver must determine that it is confident the sensor is not temporary:

   a. Uses vehicle speed. b. Uses the confidence level of previously learned sensors.

   • The typical learning time for a new sensor during continuous driving at a speed greater than 25 km/h is up to 20 minutes.
3. 3
   General conditions for canceling remote sensor learning:

   • This takes less than 20 minutes at a speed of 15.5 mph (25 km/h).
   • Confidence reduction depends on the time the vehicle travels at a speed greater than or equal to 20 km/h.