Tire Pressure Monitor Receiver / Transponder: Description and Operation

Description




1. Mode
(1) Virgin State
A. The receiver as a sole part is shipped in this state. Replacement parts should therefore arrive in this state.
B. In this state, there is no Auto-Location, no sensor wake-up, no sensor monitoring and no DTC monitoring.
C. The state indicates that platform specific parameters must be written to the receiver and that sensors are un-learned.
(2) Normal State
A. In order for tire inflation state and DTC monitoring to occur, the receiver must be in this state.
B. In this state, automatic sensor learning is enabled.
2. Overview
A. Auto-Learns new sensors.
B. Receives RF data from sensor.
C. Uses sensor data to decide whether to turn on TREAD Lamp.
D. Uses sensor information, distance traveled, background noise levels, Auto-learn status, short circuit output status, vehicle battery level, internal receiver states to determine if there is a system or a vehicle fault.

Operation

1. General Function
A. Auto learn takes place only once per Ignition cycle.
B. On successful completion.
C. Until Auto-learn completes, previously learned sensors (together with their respective locations) are monitored for under inflation / leak warnings.
D. Spare tire inflation / DTC state is not displayed.
2. General Conditions to Learn New Sensors:
A. Auto learning only functions when speed is more than 20 kph (approx. 15 mph).
B. Receiver must determine that it is confident that sensor is not temporary:
1) Uses vehicle speed.
2) Uses confidence reduction of previously learned sensors.
C. Typical time at driving over 20 kph to learn a new sensor is up to 10 minutes.
3. General Conditions to Un-Learn a sensor that is removed:
A. It takes less than 10 minutes at 20 - 30kph.
B. Confidence reduction is dependant on vehicle speed and the number of sensors known to the receiver.