Magazine for the professional tire industry
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TPMS Figure 5: Installing tire pressure sensor. Figure 6: Mounting tire using rotating wheel machine. Installation 3. Using a thin-walled socket, install the sensor nut. While holding the sensor in position, tighten the sensor nut to 71 in.-lbs. CAUTION: Over-torqueing the sensor nut by as litle as 88 in.-lbs. 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 atention to the following to avoid damaging the tire pressure sensor: 1. Wipe 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 wheel mounting hole and nut is installed. See Figures 2 and 4. NOTE: Before reinstalling an existing tire pressure sensor, replace seal and metal washer at the base of the valve stem to ensure proper sealing. See Figure 1. 2. Insert the sensor through the wheel as shown in Figure 4 keeping pressure against the rear of the metal valve stem. Te poted side of the sensor is to be positioned toward the wheel. Do not atempt to mount the sensor otherwise, or damage may occur. Install the sensor nut (with pressed-in washer) by hand. See Figures 4 and 5. NOTE: Before tightening the sensor nut, push downward on the sensor housing in an atempt to make it fush with the interior contour of the wheel. • Rotating wheel tire changers — once the wheel is mounted to the changer, position the sensor valve stem approximately 180 degrees from the head of the changer in a clockwise direction before rotating the wheel (also in a clockwise direction) to mount the tire. Use this procedure on both the upper and lower tire beads. See Figure 6. • Rotating tool changers — position the wheel on the changer so that the sensor valve stem is approximately 180 degrees from the head of the changer in a clockwise direction from the mounting end of the tool. See Figure 7. 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 specifcation. 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. 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 appropriate manufacturer service information. ■ Figure 7: Mounting tire using rotating tool machine. 72 Information for this column comes from Mitchell 1's "Tire Pressure Monitoring Systems Guide" for domestic and import vehicles, updated through 2012. Headquartered in Poway, Calif., Mitchell 1 has provided quality repair information solutions to the automotive industry for more than 80 years. For more information, visit www.mitchell1.com. MTD March 2013