Monday, 30 April 2018 16:02

ASA Partners With Bosch for 4th Webinar: 'You’ve Got the Power'

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Watson demonstrated the Ford model truck battery reset and showed how to check DTCS on a vehicle with a check engine light on. He stressed the importance of following the steps under scan test and showed how to use the links and diagrams on the scan tool to learn more about what needs to be done. Watson also showed webinar attendees how to test the heating circuit and how to determine if the heating element is bad, noting “Always test---don’t guess!”

Turning to tire pressure monitoring systems (TPMS), Watson explained that if a vehicle manufacturer recommends 35 pounds of pressure, the tire is considered significantly underinflated at 26 pounds, but may not look low until it hits 20 pounds. Reasons for the tire light to come on could be low tire pressure, a broken sensor or the wheel sensor not being recognized by the vehicle. Tools to be used for properly servicing TPMS include sensors/valves, service packs, scan/learn tools and accessories. 

Watson advised, “Never use a brass valve core with an aluminum TPMS sensor. Always use a nickel-plated valve core with aluminum TPMS sensors.

“What should you be replacing on a TPMS-equipped vehicle? What’s included in a service pack?  Service packs provide the sealing components for each applicable sensor (clamp-in or snap-in) and can be replaced just as valve stems are today. Always use new grommets, nuts, valve caps and valve cores when performing any tire service.”

It is important to replace all components within the service pack because rubber grommets replace old seals that may have taken permanent compression and may leak. The valve stem nut replaces the old nut, which may have been over-torqued and contain invisible hairline fractures. Nickel-plated valve cores prevent galvanic corrosion and ensure the integrity of the primary seal. Valve caps with seals prevent dirt and moisture from entering the sensor, and they also act as a secondary pressure seal. Old valve caps may have a seal that is compressed or missing. A washer replaces the old washer, which may also have hairline cracks from over-tightening.

Watson recommended seeking the following types of damage when inspecting a TPMS sensor: broken casing, broken antenna, tire sealant clogging holes, internal and external thread damage and galvanic corrosion. He explained that valve stem caps are important to take care of because they could impact the output, and he warned that the sensor may not relearn because it’s the wrong cap. He demonstrated how to start testing the sensors with a walk-around, pointing the tool at the valve stem on each tire. 

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