DESCRIPTION
The tire pressure warning valve and transmitters that are installed in the tire and wheel assemblies measure the air pressures of the tires. 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 page TW-23) after registration (See page TW-20) of the transmitter IDs into the tire pressure warning ECU after the ECU and/or valve and transmitter have been replaced.
1 PERFORM FORCED TRANSMISSION OF TRANSMITTER ID OF ALL WHEELS
(a) Set the tire pressure to the specified value.
Cold tire inflation pressure
(b) Make sure that the ignition switch is off.
(c) Connect the intelligent tester to the DLC3.
(d) Turn the ignition switch to the ON position and turn the tester on.
(e) Select "TIREPRESS" by following the prompts displayed on the intelligent tester.
TIRE PRESSURE:
HINT: *: It may take about 5 to 6 minutes until the values are displayed. If the values are not displayed after about 5 to 6 minutes, perform troubleshooting according to the inspection procedure for DTCs C2121/21 to C2124/24 (See page TW-42).
(f) Rapidly release the pressures from each wheel by approximately 40 kPa (0.4 kgf/cm2, 5.8 psi) within 30 seconds.
(1) Check that each tire pressure data displayed on the intelligent tester screen has changed.
OK: Each tire pressure data displayed on the intelligent tester screen will change to the value of the tire pressure.
NOTICE:
Then rapidly release the tire pressure and recheck it.
(2) After confirming that all of the tire pressure data displayed on the intelligent tester screen have changed, set the tire pressure to the appropriate specified values.
HINT: If the tire pressure data displayed on the intelligent tester screen has not changed after rechecking, go to other problem procedure (for malfunction in transmission or reception function (See page TW- 42)).
END
Diagnosis system
1. CHECK DLC3
The ECU uses the ISO 15765-4 for communication
protocol. The terminal arrangement of the DLC3
complies with SAE J1962 and matches the ISO
15765-4 format.
NOTICE:
*: Before measuring the resistance, leave the
vehicle as is for at least 1 minute and do not
opera ...
Adjustment
1. REMOVE REAR WHEEL
2. ADJUST PARKING BRAKE SHOE CLEARANCE (See
page PB-18)
3. INSTALL REAR WHEEL
Torque: 103 N*m (1,050 kgf*cm, 76 ft.*lbf)
4. INSPECT PARKING BRAKE PEDAL TRAVEL
(a) Slowly depress the parking brake pedal all the way,
and count the number of clicks.
Parking brake pedal trav ...
Compressor and magnetic clutch
COMPONENTS
...