Tire Pressure Sensor: Description and Operation
TPMS SENSORDESCRIPTION
1. MODE
1) Normal Fixed Base State
^ All sensors should be in this state.
^ Sensor transmissions occur every 30 minutes 20 seconds (nominal) and pressure is measured every 20 seconds.
^ The sensor should be read before sending a LF signal to change the sensor into this state.
2) Storage Auto State:
^ This state is a Low current consumption state.
^ Sensors are in this state when they first arrive at the dealership (either on the vehicle or as replacement spares).
^ In this state, the sensor does not measure pressure / temperature / battery level.
^ The sensor will not transmit in this state unless requested to do so by the initiate command.
3) Alert State:
^ The sensor automatically enters this state if the measured temperature exceeds 230° F(110° C) and over temperature shutdown is likely.
^ In this state, pressure is measured every 4 seconds and RF data transmitted every 4 seconds.
^ The state lasts for 1 minute if it is pressure triggered.
^ After state is also entered when a 3 psi change in pressure from the last RF transmission occurs.
NOTE: Sensor mode is used to configure sensor between high line and low line system. TPM sensor of JM should be set to low line.