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Canada - Tire Monitor System - Sensor Registration Procedure






Bulletin
TSB2240

Issue Date
2005-05-18

Market
Canada

Title
DIRECT TIRE PRESSURE WARNING SYSTEM SENSOR REGISTRATION

Component
BODY ELECTRICAL

Models
'05 Sequoia & Tundra

A direct Tire Pressure Warning System (TPWS) is now standard equipment on all 2005 model year Sequoia and Tundra vehicles.

A tire pressure sensor (or tire pressure monitor) is attached to each wheel directly sensing the air pressure of each tire. The Tire Pressure Warning System detects the pressure of each tire, including the spare tire, and illuminates a tire pressure warning light (!) to inform the driver of low tire pressure. A Set switch has also been added to the Sequoia and Tundra to set the tires' threshold pressure (the lowest tire pressure allowed before the warning light comes on) so that different pressure requirements from front and rear tires can be accommodated.
This TSB will explain how to:
- Locate the TPWS sensor ID numbers.
- How to register TPWS sensor ID numbers using the Toyota Diagnostic Tester.
- Utilize the set switch to initialize the threshold detection pressure.

APPLICABLE VEHICLES:
- 2005 model year Sequoia and Tundra vehicles.






REQUIRED SSTs:






WARRANTY INFORMATION:

TIRE SENSOR ID NUMBER:
Each tire pressure sensor has a unique ID (refer to Figure 1 of this TSB). These ID numbers must match the numbers registered in the TPWS ECU. Normally these numbers are automatically registered in the ECU during PDS (refer to TSB2092, "Tire Pressure Sensor Transmitter Activation Procedure ). However, in the event that one of the following services are performed, the ID numbers must be manually re-recorded in the TPWS ECU to ensure proper operation.
- Performing a tire and wheel swap from one vehicle to another.
- Replacing the tire pressure monitor valve sub-assembly (tire pressure sensor).
- Replacing the tire pressure monitor ECU.
- Replacing the tire pressure receiver.

NOTE:
- To help in the ID number retrieval process, it is recommended that you record the ID numbers on a separate document (Repair Order, PDS Checksheet, etc.) so they can be easily accessed for future use.
- In the event that the IDs were not previously recorded or if using the scan tool, the current registered ID numbers show all zeroes or # signs in the Data List, it will be necessary to remove each tire from the wheel to physically locate and record the sensor IDs imprinted on each sensor. Refer to step 1.

LOCATING THE SENSOR ID NUMBERS:






Using the scan tool, follow the screen prints to access and confirm the currently registered tire pressure Sensor ID numbers.






On screen "G" above, record the codes listed in the REGIT ID 1 - 5 so they can be manually re-recorded during the Registration process. Once you have the codes for all 5 tires, proceed to the Tire Pressure ID Registration process.

NOTE:
It is important that each of these codes be recorded on a separate document because once you enter the registration code, they will be erased. In addition, if you replace one or more sensors, the code written on the new sensor needs to be recorded as well.

The codes listed in the Data List REGIT ID 1 - 5 are the actual codes registered in the TPWS ECU (these codes may or may not be the correct codes for the tires currently on the vehicle).

You will confirm the codes are for this vehicle during the registration process. If they are not correct, you will have to locate the correct codes on each tire and wheel assembly to complete the registration process. Refer to instruction on how to locate the sensor codes.

If the REGIT IDs display all zeros or # signs, that means there are no current codes registered in the system. You must physically locate the sensor IDs on each sensor before beginning the registration process. Refer to instruction on how to locate sensor codes.

Follow the procedure below to locate the tire pressure sensor IDs on each sensor.
1. Deflate tire and break the top bead.

CAUTION:
Extreme caution must be used to ensure that the tire removal arm does not contact the tire pressure sensor while attempting to break the bead on the rim.

2. Depress the tire enough to inspect the tire pressure sensor.

NOTE:
It may be necessary to remove the tire from the rim to inspect for this ID.






3. On the front of the sensor, there is a 7-digit ID as shown in the figure. Write this number down for future reference (it will be needed for input using the Diagnostic Tester).
4. Reseat the tire back to the wheel and set the tire pressure of all wheels to the specified value.
5. Remount the tire and wheel assembly to the vehicle.
6. Torque all wheels to the vehicle according to the following torque specification. For more information, refer to ETAS: 2005 model year Sequoia or Tundra Repair Manual: Suspension and Axle: Tire Pressure Monitor Valve: Replacement.

Torque: 103 N-m (1050 kgf-cm, 76 ft-lbf)

7. Go to the Tire Pressure ID Registration Procedure.

TIRE PRESSURE ID REGISTRATION PROCEDURE:
1. Connect the Diagnostic Tester to DLC3.
2. Turn the ignition switch to the ON position.






Follow the screen flow.

3. View the Toyota Diagnostic Tester Data List and ensure that all tires are reading tire pressure and temperature correctly (this could take up to 5 minutes).

When the tire pressure monitor valve and tire pressure monitor ECU are replaced, be sure to follow the procedures in the repair manual to register the tire pressure monitor valve IDs, including the valve ID for the spare tire, and confirm that the IDs have been registered normally. When confirming that the IDs have been registered normally, tire pressure must decrease at least 40 kPa (0.4 kg/cm2, 5.8psi) within 30 seconds.

NOTE:
If the sensor code does not read correctly within 5 minutes, you will need to locate the actual code on the TPWS tire sensor (refer to Locating the Sensor ID Numbers).

4. Set the Threshold Pressure. Refer to the Setting the Threshold Detection Pressure procedure.

SET SWITCH PURPOSE AND FUNCTION:
A Set switch has been added to the Sequoia and Tundra to set threshold detection pressure of the tires. Due to the different tire pressure requirements from front to rear tires and required pressures of different wheel and tire combinations, it is necessary to perform this procedure under the following conditions.
- New vehicle delivery
- Tire rotation
- Tire replacement
- Tire pressure sensor replacement
- Tire pressure monitor ECU or receiver replacement

NOTE:
Refer to driver's door jam for specific tire pressure settings.

INITIALIZING THRESHOLD DETECTION PRESSURE:
1. Set the tire air pressure for all wheels, including the spare, to the specified value.
Refer to the driver's door jam for specific tire pressure settings.

2. Press and hold the tire pressure warning reset switch for 3 seconds or more with the ignition switch ON. After depressing the reset switch for 3 seconds or more, the tire pressure warning lamp will blink 3 times (1 second ON, 1 second OFF).
A. Vehicle condition for initialization
a) Perform initialization when the vehicle is in a cold state and tire pressure is adjusted to the specified value.

HINT:
A cold state means that the travel distance is less than 1.6 km (1mile) after being parked for 3 hours or more.

b) If tire pressure is not at specified value with the vehicle out of a cold state, adjust the pressure to specified value and initialize, then add 20 to 30 kPa (0.2 to 0.3 kg/cm2, 2.9 to 4.4psi).

HINT:
If the pressure is not at the specified value when initialization is performed, the warning level will also be affected.

B. If the ambient temperature is lower than when the tire pressure is adjusted (such as in winter), the tire pressure warning system will tend to warn the driver of a decrease in the tire pressure more frequently. In such a case, add 20 to 30 kPa (0.2 to 0.3 kg/cm2, 2.9 to 4.4 psi) of air pressure approximately 10 minutes after pressing the tire pressure warning reset switch (with the ignition switch in the ON position). Initialization process requires a maximum of approximately 10 minutes after pressing the reset switch.

3. Allow the system to recognize the threshold detection pressure.
A. Do not turn the ignition switch OFF during initialization (this process takes 20 minutes). Initialization will be complete when signals are received from all wheels including the spare. Initialization will be cancelled if the ignition switch is turned OFF during the process.
B. Confirm that initialization is complete using the hand-held tester.
C. Check that the pressure for each tire is displayed in INIT THRESHOLD 1 to 5.

NOTE:
For further details of the Tire Pressure Warning System and functions of the SET switch, refer to the new car features manual outlined in ETAS: 2005 model year Sequoia or Tundra Manual: New Car Features: Chassis and Drivetrain: Tire Pressure Warning System.

NOTE:
Issue of this Technical Service Bulletin is to ensure that proper repair information is available. IT DOES NOT CONSTITUTE AN AUTHORIZATION FOR REPAIR. Normal provisions of the formal warranty policy, as applicable, will apply.
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