Modern Tire Dealer

NOV 2018

Magazine for the professional tire industry

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Page 101 of 111

T P M S M T D N o v e m b e r 2 0 1 8 98 5) Turn the Techstream ON. 6) Perform the transmitter ID registra- tion. Enter the following menus: Chas- sis / Tire Pressure Monitor / Utility / ID Registration. 7) Input the transmitter IDs (ID1 to ID5) using the Techstream and transmit them to the tire pressure warning ECU. NOTE: Registration can begin while in initialization mode. However, the initializa- tion will be cancelled when the registration is started. 8) e "ID Registration is complete" is displayed on the Techstream display. 9) Confirm tire pressure data from all wheels is displayed on the Techstream display. NOTE: It may take about two or three minutes until the values are displayed. If the values are not displayed aer a few minutes, perform troubleshooting according to the inspection procedure for DTCs C2121/21 to C2124/24. If the IDs have not been registered, DTC C2171/71 will be stored in the tire pressure warning ECU aer three minutes or more. • If correct pressure values are displayed, the IDs have been registered correctly. • If the tire pressure values are not displayed after a few minutes, the IDs may be incorrect or the system may have a malfunction. After all IDs are registered, DTC C2126/26 (Transmitter ID not Received in Main Mode) is stored in the tire pressure warning ECU and the tire pressure warning light blinks for 1 minute and then comes on. When the tire pressure warning ECU successfully receives radio waves from all the transmitters whose IDs are stored in the ECU, DTC C2126/26 is deleted and the tire pressure warning light goes off. 10) Enter the menu items in this order: Chassis / Tire Pressure Monitor / Data List. Confirm that the expected data of tire pressure of all tires are displayed on the screen. DEMOUNTING/MOUNTING PROCEDURES CAUTION: e tire should be demounted from the wheel using the tire changer manufacturer's instructions. Use the fol- lowing information to avoid damage during the demounting/mounting procedures. NOTE: The system will need to be initialized when tires are replaced with tires of different pressures, or tire pressure sensor and/or tire pressure monitor ECU are replaced. When a tire pressure sensor and/or tire pressure monitor ECU are replaced, the sensor ID must be memorized (registered) by the tire pressure monitor ECU prior to system initialization. See "Reset procedures." TIRE PRESSURE SENSOR CAUTION: The use of tire sealants is strictly prohibited for vehicles equipped with the TPMS. Tire sealants can clog tire pressure sensors. CAUTION: Be sure to reinstall tire valve caps, or dirt or moisture could get into the valve core and cause air leakage. Use only the original valve cap. If any other valve cap is used, it may corrode or melt, and become extremely difficult to remove. NOTE: e average life of the grommet of the tire pressure sensor is approximately five years, at which time it must be replaced. If the valve is leaking air, but it is less than five years old and the grommets are in good condition, retighten valve nut to 35 in.-lbs. (4 N.m). Whenever the tires must be replaced, replace grommets for tire pressure sensors as well. NOTE: If the tire pressure valve sub- assembly is going to be replaced, make a note of the seven-digit number (transmitter ID) before installation, as it cannot be seen aer the sensor is installed (see Figure 5). Whenever a new sensor is installed, it will need to be registered in the tire pressure monitor ECU. Removal 1) When replacing a wheel or tire, tire pressure sensors must be set up in one of the following ways: Remove the sensor from the old wheel and install it in the new wheel. Keep the same wheel with tire pressure sensor, and replace only the tire. Or use a new wheel and sensor (the new sensor must be registered aer installation). 2) Remove the wheel. Remove the cap and valve core, and release air from the tire (see Figure 6). NOTE: Keep the removed cap, valve core, nut and washer. 3) Aer ensuring that air is sufficiently released, remove the nut and washer that is used to hold the tire pressure sensor and drop the sensor inside the tire. NOTE: Be careful not to damage the tire pressure sensor due to interference between the sensor and the tire bead. 4) Aer dropping the tire pressure sensor into the tire, disengage the bead using the shoe of the tire remover (see Figure 7). 5) Remove the bead on the upper side following the usual procedure. 6) Take out the sensor from the tire, and remove the bead on the lower side following the usual procedure. NOTE: Check that no cracks or damage are visible on the grommet. If so, replace the grommet together with the washer and nut. Always replace the grommet and washer when replacing the warning valve and transmitter. 7) Remove the inner grommet from the tire pressure sensor, or retrieve from the wheel, if necessary. NOTE: e tire pressure sensor is pow- ered by a lithium battery. When the sensor Torque specifications Component Ft.-lbs. (N.m) Wheel nut 1 76 (103) In.-lbs. (N.m) Tire pressure sensor nut (1-piece sensor) 35 (4) Torx screw (2-piece sensor) 44 (5) Figure 7: Disengaging the bead using a tire remover. COURTESY OF TOYOTA MOTOR SALES U.S.A. INC. Figure 8: Installing the tire pressure monitoring sensor. COURTESY OF TOYOTA MOTOR SALES U.S.A. INC.

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