Auto Service Professional

FEB 2018

Magazine for the auto service professional

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Page 46 of 61

45 | ASP February 2018 Circle 116 on Reader Service Card Technical shows up at 5 p.m. on a Saturday, and the last thing you want is to have to wait for your local parts store to deliver a sensor, assuming that they are even able to do so. With universal/programmable sensors, you can stock one to two sensors and be covered, with no huge inventory investment. Don't forget to replace the TPMS service kit. OEMs recommend replacing the TPMS sensor components (rubber valve for a snap-in style sensor) and core, cap, grommet, etc., if it is a clamp-in style sensor during every tire service (including installation of new tires, new wheels, tire repair, etc.). ese special sealing elements are designed for a single use and should be replaced peri- odically to ensure a proper seal between the sensor and wheel. Several distributors offer service kit assortments covering many vehicle applications. ere are even TPMS valve assortments that cover the ever-growing number of replace- ment rubber TPMS valves. Note that a valve-mounted sensor (snap-in or clamp-in) can be used to replace a banded sensor. NOTE: Ford has two relearns available, one for tire rotation which uses the hazard switch to initiate the relearn (listed in the owner's manual), and another relearn when a new sensor has been introduced on a vehicle and uses a sequence of steps to put the vehicle into relearn mode by cycling the ignition switch (not listed in the owner's manual). Another tip: When one or more of the tires are significantly underinflated, the TPMS indicator will be solid at start-up. If a mal- function occurs (typically a sensor issue), the MIL will blink for 60 to 90 seconds and then go solid. e first step in properly diagnosing a TPMS issue is to note what the TPMS light/ MIL tells you at start-up. Upgrading tires and changing placard value Apparently, the process is quite simple. For direct-TPMS, using the appropriate scan tool that allows this reprogramming function, select the mode that enables tire pressure value resetting (the steps will vary depending on the make and model of tool), change the factory OEM values to the new desired values, again following the prompts on the specific tool in use. Once the system has been reprogrammed to alert based on a new inflation pressure value, fill out a supplemental tire cold inflation pres- sure placard and attach it near the factory tire placard. Include the new tire size, load rating and new cold inflation pressure. Winter wheels/tires It's common for many customers to switch to dedicated winter tires for their region's cold/snow weather period. Obviously, we have several options. e original or "summer" tires may be demounted and the winter tires of the same size may be mounted to the same wheels. Since a tire service is being performed, it's best to take the opportunity to install new TPMS sensors and service replace- ment parts to ensure proper sealing and

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