Toyota Sienna Service Manual: Initialization not Completed

DTC C2177/77 Initialization not Completed

DESCRIPTION

Initialization is necessary after replacing any of the ECUs, tires with different tire pressure, or tire pressure warning valve and transmitter, after rotating the tires or when a new vehicle is delivered.

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:

When replacing the tire pressure warning ECU, read the IDs stored in the old ECU using the intelligent tester and write 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 FREQUENCY RECEIVING CONDITION

(a) Check if the vehicle is not located in areas such as described below: (1) Facilities or devices that use similar radio frequencies are located in the vicinity of the vehicle.

HINT: If the vehicle is located in areas described above, the tire pressure warning light may come on after blinking 1 minute only in a particular area.

(2) Devices using similar radio frequencies are used in the vehicle.

OK: Facilities, or devices that use similar radio frequencies are not located in the vicinity of the vehicle.

HINT: Radio frequency may be interrupted due to surroundings or devices installed by the user.

2 IDENTIFY TRANSMITTER CORRESPONDING TO DTC

(a) Set the tire pressure to the appropriate specified values.

Cold tire inflation pressure

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

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

(e) Select "TIREPRESS" by following the prompts displayed on the intelligent tester.

TIRE PRESSURE:

IDENTIFY TRANSMITTER CORRESPONDING TO DTC

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).

(f) Rapidly reduce the tire pressure for each wheel at least 40 kPa (0.4 kg/cm2, 5.8 psi) within 30 seconds.

(g) Check the DATA LIST.

NOTICE:

It takes about 5 to 6 minutes to display the updated tire pressure 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 rapidly release the tire pressure and recheck it.
Record the transmitter ID of which "TIREPRESS" data corresponds to each tire.

(h) After confirming that one of "TIREPRESS" data for one tire (ID1 to ID4) has changed, repeat this procedure one by one. Identify the transmitter that corresponds to a DTC.