Tire Pressure Monitor - Sensor Registration
PRODUCT GENERAL INFORMATIONPG007-05
Title:
DIRECT TIRE PRESSURE WARNING
SYSTEM SENSOR REGISTRATION
Models:
'05 Sequoia & Tundra
May 23, 2005
Introduction
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.
^ 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 Numbers
Each tire pressure sensor has a unique ID number (refer to Figure 3 in this TSB). These ID numbers must match the numbers registered in the TPWS ECU. 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 ID numbers were not previously recorded or if using the Diagnostic Tester, 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 ID number imprinted on each sensor. Refer to step 1.
Locating the Sensor ID Numbers
Using the Diagnostic Tester, follow the screen prints below to access and confirm the currently registered tire pressure sensor ID numbers.
On screen "G" above, record the sensor ID numbers listed in the REGIT ID 1 - 5 so they can be manually re-recorded during the registration process. The sensor ID numbers listed in the Data List REGIT ID 1 - 5 are the actual sensor ID numbers registered in the TPWS ECU (these sensor ID numbers may or may not be the correct sensor ID numbers for the tires currently on the vehicle).
NOTE:
It is important that each of these sensor ID numbers be recorded on a separate document because once you enter the registration ID number, they will be erased. In addition, if you replace one or more sensors, the sensor ID number written on the new sensor needs to be recorded as well.
You will confirm the sensor ID numbers are for this vehicle during the registration process. If they are not correct, you will have to locate the correct sensor ID numbers on each tire and wheel assembly to complete the registration process. Refer to instruction on how to locate the sensor ID numbers.
If the REGIT IDs display all zeros or # signs, that means there are no current sensor ID numbers registered in the system. You must physically locate the sensor ID number on each sensor before beginning the registration process. Refer to page 4 for instruction on how to locate sensor ID numbers. Once you have the sensor ID numbers for all 5 tires, proceed to the Tire Pressure ID Registration Procedure".
Follow the procedure below to locate the tire pressure sensor ID number 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 below.
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 the Technical Information System (TIS): 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. 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 ID numbers, including the valve ID for the spare tire, and confirm that the ID numbers have been registered normally. When confirming that the ID numbers have been registered normally, tire pressure must decrease at least 5.8 psi (0.4kg.sq.cm, 40 kpa) within 30 seconds.
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).
NOTE:
If the sensor ID number does not read correctly within 5 minutes, you will need to locate the actual sensor ID number on the TPWS tire sensor (refer to "Locating the Sensor ID Numbers").
4. Set the threshold pressure. Refer to the "Initializing Threshold Detection Pressure" procedure below.
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 Set switch for 3 seconds or more with the ignition switch "ON." After depressing the Set switch for 3 seconds or more, the tire pressure warning lamp will blink 3 times (1 second ON, 1 second OFF).
Perform system initialization when the vehicle tires are cold (driven less than 1 mile [1.6 km] after parked for 3 hours or more) and the tire pressure is adjusted to the specified value.
WARM TIRE NOTE:
If the tires are warm at the time of initialization, lower the tire pressure to the recommended specification on the driver's door jamb. Initialize the system utilizing the Set switch. When the light stops blinking, add 2.9 to 4.4 psi (0.2 to 0.3 kg/sq.cm, 20 to 30 kPa) back to the tire. This will ensure that when the tires are cold, they will not drop below specification.
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.
If the ambient temperature is low 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 2.9 to 4.4 psi (0.2 to 0.3 kg/sq.cm, 20 to 30 kPa) of air pressure approximately 10 minutes after pressing the tire pressure warning system Set switch (with the ignition in the "ON" position).
B. Confirm that initialization is complete using the Diagnostic 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 TIS: 2005 model year Sequoia or Tundra manual: New Car Features: Chassis and Drivetrain: Tire Pressure Warning System.