Magazine for the auto service professional
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50 | February 2016 The rubber snap-in valve is attached to the sensor module by a hex nut (or Torx screw). When two-piece, clamp-in sensors are removed from a wheel, the sensor should be ftted with a new rubber grommet, alumi- num retaining nut, special nickel-plated valve core and valve cap. It is important that all components be torqued to appro- priate values to prevent air leaks and valve damage. Attempting to reuse the original rubber grommet, valve core and retaining nut may result in an air leak. There are three types of sensor relearns: stationary, OBD and auto learn. Stationary relearn sensors need an activa- tion tool with the car in "relearn" mode. New IDs can be programmed without driving the vehicle. OBD relearn requires an activation tool in conjunction with an OBD scan tool to pro- gram new sensor IDs into the vehicle. New IDs can be programmed without driving the vehicle. With the auto learn sensor, the vehicle can learn a single new ID and in some cases multiple new IDs without the use of a tool. The vehicle must be driven a prescribed time in order to turn off the light. Charting the way You do not need to memorize the various relearn protocols. Each carmaker provides the necessary information. But there is a more convenient way: the TIA TPMS Relearn Chart. The TPMS chart is divided into domestic and import vehicle sections and includes relearn requirements, relearn summaries, OEM sensor part number, and replace- ment sensor and seal kit part numbers for Schrader International, Dill Air Controls Products, Myers Tire Supply, 31 Inc. Xtra- Seal, Continental VDO and NAPA. It also includes the sensor numbers for Orange Electronics and Standard Motor Products. The chart lists the torque specs for the sensor nut, Torx bolt, worm gear and vehi- cle wheel fasteners. The 2015 TPMS Relearn Chart includes troubleshooting tips to help technicians when the relearn is not working, revised relearn summaries so that they are more easily understood, pictures and part num- bers for common multi-app, programmable sensors on the market and a valve reference page with pictures and part numbers of the various type of TPMS valves. "The TPMS Relearn Chart is a durable, easy-to-use source of information that is specifcally designed to be handled and used by technicians on the shop foor. With the annual updates, technicians are always prepared to service whatever vehicle drives into their shop," said TIA Director of Automotive Training Development Sean MacKinnon. The bottom line Granted, you won't get rich (or even keep the lights on) by installing replace- ment kits that cost you about $5 and retail out at $10. Ditto for replacing complete sensors. But it may prevent a come-back that may take rather than make money. It also ensures customer satisfaction and that translates into repeat business. Complete diagnostics and sensor replace- ments produce some parts and labor income. Most important, customers learn from an informed service pro and willingly opt for TPMS sensor replacement. The customer profts from excellent service. You boost your bottom line a bit with professional TPMS service. ● The Chassis This pie chart shows a breakout of the three types of replacement TPMS sensors. Photo courtesy of Bartec USA LLC