Modern Tire Dealer

MAY 2019

Magazine for the professional tire industry

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M T D M a y 2 0 1 9 60 T P M S Removal 1) Remove the tire and wheel assembly from the vehicle. 2) Demount the tire from the wheel following the tire changer manufacturer's instructions while paying special attention to the following to avoid damaging the pressure sensor: • When breaking the tire bead loose from the wheel rim, avoid using the bead breaker in the area of the sensor. at includes both front and rear beads of the tire (see Figure 4). • When preparing to demount the tire from the wheel, carefully insert the mount- ing/demounting tool at the valve stem +/- 10 degrees, and then proceed to demount the tire from the wheel. Use this process on both the upper and lower tire beads. 3) Using a thin-walled socket, remove the special nut retaining sensor from the wheel. While removing the nut, hold pres- sure against the rear of the metal valve stem to keep the valve stem from pushing rearward, which could damage the antenna strap (see Figure 2). 4) Remove the sensor (see Figure 5). Installation NOTE: Before reinstalling an existing tire pressure sensor, replace the seal and the metal washer at the base of the valve stem to ensure proper sealing (see Figure 1). 1) Wipe the area clean around the sensor/valve stem mounting hole in the wheel. Make sure the surface of the wheel is not damaged. CAUTION: To avoid damaging the sensor antenna strap, hold pressure against the rear of the metal valve stem while the sensor is inserted through the wheel mounting hole and the nut is installed (see Figures. 2 and 5). 2) Insert the sensor through the wheel as shown keeping pressure against the rear of the metal valve stem. e potted side of the sensor is to be positioned toward the wheel. Do not attempt to mount the sensor otherwise, or damage may occur. Install the sensor nut (with a pressed-in washer) by hand (see Figures 5 and 7). NOTE: Before tightening the sensor nut, push downward on the sensor housing in an attempt to make it flush with the interior contour of the wheel. 3) Using a thin-walled socket, install the sensor nut. While holding the sensor in position, tighten the sensor nut to 71 in.-lbs. (8 N.m). CAUTION: Over-torqueing the sensor nut by as little as 106 in.-lbs. (12 N.m) may result in sensor separation from the valve stem. Under this condition, the sensor may still function; however, the condition should be corrected immediately. 4) Mount the tire on the wheel following the tire changer manufacturer's instructions, paying special attention to the following to avoid damaging the tire pressure sensor: Rotating wheel tire changers Once the wheel is mounted to the changer, position the sensor valve stem approximately 210 degrees from the head of the changer in a clockwise direction before rotating the wheel (also in a clock- wise direction) to mount the tire. Use this procedure on both the upper and lower tire beads (see Figure 8). Rotating tool tire changers Position the wheel on the changer so that the sensor valve stem is approximately 210 degrees from the head of the changer in a clockwise direction from the mount- ing end of the tool (see Figure 9). Make sure the sensor is clear of the lower bead breaker area to avoid damaging the sensor when the breaker rises. Rotate the tool in a counterclockwise direction to mount the tire. Use this procedure on both the upper and lower tire beads. 5) Adjust air pressure to specification. Make sure the original style valve stem cap is securely installed to keep moisture out of the sensor. Install the wheel and tire assembly on the vehicle. 6) Drive the vehicle for a minimum of 10 minutes while maintaining a continuous speed above 15 mph (24 km/h). During this time, the system will learn the new sensor ID code and will clear any DTCs automatically. If a sensor cannot be trained, see the appropriate manufacturer service information. ■ Information for this column comes from the tire pressure monitoring systems data in ProDemand®, Mitchell 1's auto repair information software for domestic and import vehicles. Headquartered in Poway, Calif., Mitchell 1 has provided quality repair information solutions to the automotive industry since 1918. For more information, visit www.mitchell1.com. Torque specifications Component Ft.-lbs. (N.m) Wheel nut 100 (135) In.-lbs. (N.m) Tire pressure sensor nut 171 (8) Torx screw 12 (1.4) Over-torquing the sensor nut by as little as 106 in.-lbs. (12 N.m) may result in sensor separation from the valve stem. Under this condition, the sensor may still function; however, the condition should be corrected immediately. Figure 9: Mounting a tire using a rotating tool machine. Figure 8: Mounting a tire using a rotat- ing wheel machine.

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