Auto Service Professional

FEB 2018

Magazine for the auto service professional

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38 | ASP February 2018 Technical identify vehicle model year, not the build date. – Make sure that the shop has an assortment of service kits in-house for easy access. – Protect the wheel when pulling the valve stem through. More rubber stem sensors are used on aluminum wheels. – Follow the specific vehicle relearn procedure: • Some vehicles must be driven immediately after relearn for a length of time at or above a specific speed. • Some vehicles must sit for a predetermined time after relearn before driven for a length of time at or above a specific speed. • Some vehicles require sensors to be trig- gered a second time after relearn. • Be sure to keep your TPMS tool fully charged and updated with the latest software. • When triggering sensors, it is possible that you might have to rotate the tire so the vehicle can receive the RF (re: interfer- ence from body panels, modules, brake components and steering/suspension components). • If one sensor battery is dead, the others are likely close (if all were installed at the same time). • Always change service kits to prevent ghost leaks and comebacks. • Some GM vehicles must be put into Service Mode in order to access the relearn mode. • Newer Fords have Auto-Relearn capability. • Newer Fords have a tire rotation relearn and a sensor replacement relearn. e tire rota- tion relearn will not learn a new sensor ID. – Sensor battery life typically lasts seven to 10 years. ese batteries are not replaceable as they are fully enclosed in the sensor body. Attempting to replace the battery can com- promise the integrity of the sensor assembly, ultimately leading to system failure. – Aluminum stem cor- rosion must be addressed. Regularly checking the condition of the valve stem and replacing the service kit hardware during every tire service are ways to reduce the risk of corrosion issues. It is also important to use only hardware that is approved for use with TPMS sensors. For example, older non-TPMS valve cores that are made of brass cannot be used with TPMS valve stems. Nickel plated valve cores must be used in order to prevent corrosion. Tips from Dill Valves e information here on aluminum stem corrosion is provided by Tyson Boyer of Dill Valves/Dill Air Control Products. Aluminum is a lightweight TPMS sensor manufacturers offer individual tools as well as com- plete tool kits that are dedicated specifically for TPMS service. Photo courtesy 31inc.

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