Modern Tire Dealer

MAR 2019

Magazine for the professional tire industry

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T P M S M T D M a r c h 2 0 1 9 64 push the reset switch without adjusting tire inflation pressure of all four tires. Otherwise, the low tire pressure warning light may not come on even if the tire pressure is low, or it may come on when the tire inflation pressure is actually normal. If you push the reset switch while the vehicle is moving, initialization is not performed. NOTE: When a tire pressure sensor and/ or tire pressure monitor ECU is replaced, the sensor ID must be memorized (registered) by the tire pressure monitor ECU prior to system initialization. See "Tire pressure sensor registration." NOTE: When initializing the system, the current tire condition is stored as a standard. Perform the tire pressure adjustment aer the vehicle has sufficiently cooled down. If it hasn't sufficiently cooled, increase the air pressure in the tires approximately 3 psi to 4 psi (20-30 kPa). NOTE: e initialization mode can be terminated by making a short circuit between terminals No. 4 and 13 of the DLC3 connector (located under le side of instrument panel). During initialization, the tire pressure sensor measures the inflation pressure of the tires, and registers the signals that are transmitted into the tire pressure monitor ECU at a frequency of one per minute. e initialization process is completed when the signals from the four tires have been received. e initialization process is canceled if the ignition switch is turned to the OFF position prior to the completion of initialization. To restart initialization, the tire pressure warning reset switch must be pressed again. 1) Set the tire pressure of all wheels to the pressure specified on the tire and loading information label. 2) With the vehicle stopped and the parking brake applied, turn the ignition switch ON. NOTE: Initialization is normally com- pleted within five to six minutes. If initializa- tion has not been completed successfully, DTC C2177/77 is set aer the vehicle is driven for 20 minutes or more. 3) Press and hold the tire pressure warning reset switch until the tire pres- sure warning light blinks three times at one-second intervals (see Figure 1). 4) Turn the ignition switch OFF. 5) Connect the Techstream to the DLC3. Turn the ignition switch ON, and turn the Techstream ON. 6) Enter the following menus: Chassis / Tire Pressure Monitor / Data List. 7) Confirm that the expected tire pres- sure data of all tires is displayed on the Techstream screen. Initialization can be terminated by connecting terminals 13 (TC) and 4 (CG) of the DLC3 (see Figure 2). TIRE PRESSURE SENSOR REGISTRATION NOTE: When a tire pressure sensor and/or tire pressure monitor ECU is replaced, the sensor ID must be memorized (registered) by the tire pressure monitor ECU prior to system initialization. To perform this procedure, a Toyota Techstream must be used. It is not necessary to register the sensor ID(s) when only tire rotation is performed. NOTE: Before beginning the registration process on vehicles where tire pressure sensors have not been replaced, retrieve sensor transmitter ID(s) using Techstream or by reading the ID on the tire pressure sensor. If a sensor is being replaced with a new one, make a note of the eight-digit number (transmitter ID) before installa - tion, as it cannot be seen aer the sensor is installed (see Figure 3). Set the tire pressure of all the wheels to the pressure specified on the tire and loading information label. 2) With the ignition switch OFF, connect the Techstream to the DLC3. 3) Turn the ignition switch to ON . Figure 4: An exploded view of the tire pressure sensor. Figure 5: Disengaging the bead using a tire remover.

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