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 automatic location, no sensor wake-up, no sensor monitoring, and no DTC monitoring.
      • This state indicates that platform-specific parameters must be written to the receiver and that the sensors are untrained.
   2. Normal State
      • To monitor tire inflation status and DTCs, the receiver must be in this state.
      • In this state, automatic sensor location/learning is enabled.
2. 2
   Overview

   • Learn the TPMS sensor for automatic inflation monitoring.
   • Uses sensor information, distance traveled, background noise levels, auto learn status, short/open circuit output status, vehicle battery charge level, and internal receiver status to determine whether there is a system or vehicle malfunction.

Operation

1. 1
   General Function

   • Auto-learn occurs only once per ignition cycle.
   • Upon successful completion, the IDs of the 4 wheel sensors are stored in memory for monitoring.
   • Until auto learn is completed, previously learned sensors are monitored for under-inflation / leak warnings.
2. 2
   General conditions for learning new sensors:

   • The receiver must determine that it is confident that the sensor is not temporarily: a. Using vehicle speed. b. Using the reduction of confidence in previously learned sensors.
   • The typical continuous driving time at a speed greater than 25 km/h to learn a new sensor 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 (20-30 km/h).
   • The reduction in confidence depends on the driving time of the vehicle at a speed greater than or equal to 12.4 mph (20-30 km/h).