Toyota Tundra Service Manual: Initialization

INITIALIZATION

NOTICE:

• Initialization can be confirmed through the tire pressure warning light.
• If the ignition switch is turned off during initialization, the tire pressure warning ECU and receiver memorizes that initialization was being performed. Therefore, it is not necessary to perform the initialization procedure again after turning the ignition switch to ON.
• The order in which the data is received is random.
• If the signals from all the tire pressure warning valve and transmitters are received, initialization is completed.
• Initialization is completed when the Data List "ID Tire Inflation Pressure" display shows the correct pressures.

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• Initialization is normally completed within a few minutes. However, it may take 10 minutes or more until the tire pressure of the tire inflation pressure display function is shown.
• It may take a few 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.

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  HINT:

  For this vehicle, data reception from the tire pressure warning valve and transmitter may worsen while displaying the Data List and it may takes longer than usual to receive data.

  If data reception worsens while displaying the Data List, rapidly decrease the tire pressure by 20 to 30 kPa (this increases the valve transmission frequency).

• If initialization has not been completed successfully, DTC C2177/77 is stored after a vehicle speed of 40 km/h (25 mph) or more continues for 20 minutes or more.
• During test mode (signal check mode), the system will not change to initialization mode even if the initialization procedure is performed.
• Tire Inflation Pressure Display Function:

  If initialization is performed, the existing tire positions will be cleared, but will be automatically identified when the vehicle is driven at 40 km/h (25 mph) or more for 10 to 30 minutes.

• Initialization will not complete and DTC C2177/77 may be stored in the tire pressure warning ECU and receiver if the Techstream is used to perform initialization with the ECU Data Item list displayed for 10 minutes or longer.
• Initialization can be terminated by connecting terminals 13 (TC) and 4 (CG) of the DLC3.

  *a	Front view of DLC3

BEFORE INITIALIZATION

(a) Set the tire pressure to the specified value.

NOTICE:

Refer to the link as the procedure for adjusting the tire pressures differs depending on the temperature of the tires.

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HINT:

The tire pressure warning system illuminates the tire pressure warning light to warn the driver when any of the following condition is met:

• Due to the operation of the tire pressure warning reset switch, the tire pressure drops to approximately 75% or less of the tire pressure set during system initialization.

INITIALIZATION PROCEDURE

(a) Turn the ignition switch to ON.

(b) Press and hold the tire pressure warning reset switch for 3 seconds or more so that the tire pressure warning light blinks 3 times.

(c) With the ignition switch ON, wait for approximately 5 minutes.

HINT:

For this vehicle, it may take longer than usual to receive data from the tire pressure warning valve and transmitter while the Data List is displayed. Therefore, before displaying the Data List, wait approximately 5 minutes to receive data from the tire pressure warning valve and transmitter.

(d) Turn the ignition switch off.

(e) Connect the Techstream to the DLC3.

(f) Turn the ignition switch to ON and the Techstream on.

(g) Enter the following menus: Chassis / Tire Pressure Monitor / Data List.

HINT:

• *: It may take a few minutes until the values are displayed.
• The wheel position cannot be determined from ID1 through ID4 on the Data List.

(h) Check that initialization has been completed.

(i) Confirm that the tire pressure data of all tires is displayed on the Techstream screen.