Toyota Sienna Service Manual: Abnormal Temperature Inside ID1 Tire

DESCRIPTION

Each tire pressure warning valve and transmitter measures the internal temperature of its tire as well as tire pressure, and transmits the information to the tire pressure warning ECU along with the transmitter ID.

If the measured temperature is out of the specified range, the tire pressure warning ECU recognizes it as a malfunction, outputs DTCs, and illuminates the tire pressure warning light after blinking for 1 minute.

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:

• When replacing the tire pressure warning ECU, read the IDs stored in the ECU using the intelligent tester and note them down before removal.
• 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 CHECK TIRES

(a) Check the tire is not flat, and there is no indication of air pressure drop.

OK: Tire is normal.

HINT: If a tire is damaged, the tire pressure warning valve and transmitter may also have been damaged at the same time.

2 IDENTIFY TRANSMITTER CORRESPONDING TO DTC

(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.

(e) Display the "TIREPRESS" data for each wheel using the intelligent tester.

(f) Rapidly reduce the tire pressure for each wheel at least 40 kPa (0.41 kg/cm2, 5.8 psi) within 30 seconds.

(g) Check the DATA LIST.

TIRE PRESSURE:

HINT: *: It may take about 5 to 6 minutes until the values are displayed. If the values are not displayed after a few minutes, perform troubleshooting according to the inspection procedure for DTCs C2121/21 to C2124/24 (See page TW-42).

(h) When the "TIREPRESS" data (ID1 to ID4) has changed, repeat this procedure to identify the tire pressure warning valve and transmitter that corresponds to a DTC.

(i) When all of the "TIREPRESS" data (ID1 to ID4) have changed, identify the malfunctioning tire pressure warning valve and transmitter based on the recorded ID numbers and output DTC.

Result

NOTICE:

• It may take about 5 to 6 minutes to display the updated data.
• When no "TIREPRESS" data has changed, reset the tire pressure to the appropriate specified value and rotate the tire 90 to 270 degrees. Then forcibly transmit the transmitter ID and recheck it.
• Record the transmitter ID and position that is normal condition.

3 REPLACE TIRE PRESSURE WARNING VALVE AND TRANSMITTER

(a) Replace the identified tire pressure warning valve and transmitter with a new one (See page TW-84).

HINT:

• Before installing a new tire pressure warning valve and transmitter, read and write down its transmitter ID.
• The IDs for the tire pressure warning valve and transmitter which are not replaced should be checked using the tester and recorded.

4 CHECK REGISTRATION OF TRANSMITTER ID

(a) Register the transmitter ID for 4 tires (See page TW-20).

5 PERFORM INITIALIZATION

(a) Perform initialization (See page TW-23).

6 READ VALUE ON INTELLIGENT TESTER

(a) Make sure that the ignition switch is off.

(b) Connect the intelligent tester to the DLC3.

(c) Turn the ignition switch to the ON position.

(d) 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 a few minutes, perform troubleshooting according to the inspection procedure for DTCs C2121/21 to C2124/24 (See page TW-42).

Result

REPLACE TIRE PRESSURE WARNING ECU (See page TW-87)