The tire pressure warning valve and transmitters that are installed in the tire and wheel assemblies measure the tire pressures. The measured values
are transmitted to the tire pressure warning antenna and receiver on the body as radio waves and then sent to the tire pressure warning ECU. The
ECU compares the measured air pressure values with the air pressure threshold. When the measured air pressure value is less than this threshold, the
warning light in the combination meter comes on. The tire pressure warning ECU stores a DTC when the tire pressure warning valve and transmitter
stops transmitting signals. At this time, forcibly transmit the signals by releasing the tire pressure rapidly. The stored DTC is cleared when the signal
transmission is resumed.
HINT
It is necessary to perform the procedure to identify the tire pressure warning valve and transmitter that is malfunctioning because
it cannot be identified by the output DTC.
INSPECTION PROCEDURE
NOTICE:
It is necessary to perform initialization See: Instrument Panel, Gauges and Warning Indicators/Tire Monitoring System/Testing
and Inspection/Programming and Relearning/Initialization after registration See: Instrument Panel, Gauges and Warning
Indicators/Tire Monitoring System/Testing and Inspection/Programming and Relearning/Registration of the transmitter IDs into
the tire pressure warning ECU if the ECU and/or any of the valve and transmitters have been replaced.
PROCEDURE
1. PERFORM FORCED TRANSMISSION OF TRANSMITTER ID OF ALL WHEELS
(a) Set the tire pressure to the specified value See: Maintenance/Wheels and Tires/Testing and Inspection/Component Tests and General
Diagnostics.
(b) Turn the engine switch off.
(c) Connect Techstream to the DLC3.
(d) Turn the engine switch on (IG) and turn the tester on.
(e) Enter the following menus: Chassis / Tire Pressure Monitor / Data List.
(f) Check the values by referring to the table below.
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