TPMS Quick Tip: The Scoop On The Goop

TPMS Quick Tip: The Scoop On The Goop

TechShop airs out the facts surrounding tire sealers and TPMS components.

A good majority of our time is always taken educating our customers on the what, when and why of vehicle maintenance. If they heed it, the advice we give can save them a lot of time, money and frustration, and us too.

A frequent question is one about the use of tire sealers in a can, and the consequences of it can be far greater when TPMS systems are involved. Don’t get me wrong, these sealers can be effective in a pinch and I’ve never been opposed to stashing one in the trunk, especially on a long trip. But it’s important for your customers to know the facts surrounding their use and the TPMS system on their car.

You’ll hear different arguments about whether or not they are TPMS sensor safe, and most of the tire sealer manufacturers tell you that they are indeed safe. It is true that in recent years, new formulations have been made to make these products less corrosive and non-explosive, but there are still details that get overlooked.

Most of the labeling will state “Tire Sensor Safe,” and it’s highly unlikely that any immediate damage will occur to a sensor, but if you read past the large print, the manufacturers tell you that as soon as possible, the vehicle should be taken to a professional repair facility, the tire permanently patched or plugged, all of the residue from the sealer removed and cleaned out from the tire and the TPMS sensors should be thoroughly cleaned.

It’s important to point out that if these sealers are left in a tire for an extended period of time, they can cause corrosion and damage to the tire, wheel and TPMS sensor, and here are some additional tips to lend to your customers: 

  • These sealers are a mess, take a long time and burn up shop supplies to clean, neither of which is free. 
  • These are designed for emergencies and not intended as permanent repairs. In the case that it works effectively, what’s the first thing that we are all guilty of? “It’s holding air; I’ll go tomorrow.” All of a sudden, it’s a week, then a month. You get the idea. 
  • New formulations may be less corrosive, but who knows how old the can in the trunk is and it might work just fine but do damage much quicker. 
  • These may work for small punctures but won’t on major damage and once it’s out of the can, it’s a mess regardless of the result. 
  • Some auto manufacturers specifically warn against it, and its use could affect the warranty on any TPMS components.

Knowing the facts and using these sealers properly is the name of the game. Keeping a can of it on the counter is a good conversation starter and a way to educate your customer before they bring you a mess.

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Scan Tool Tech

While systems can and will differ, here’s a look at common ADAS features, their general configurations and calibration requirements.

scan tool tech

Advanced Driver Assistance Systems (ADAS) require the use of a scan tool for diagnostics, and the majority of the time, it’s required for post-repair calibration. ADAS, like any other system, requires a diagnostic routine, which begins with a base knowledge of the system. Knowing ADAS will help understand fault symptoms and scan tool data for the most efficient diagnosis.While systems can and will differ, here’s a look at common ADAS features, their general configurations and calibration requirements.Parking assist sensors, of which there can be more than one, are generally located in the front and rear bumpers. They are the inputs that affect active parking assist and parking collision warnings. Any time they are disturbed in any manner, a static calibration must be performed with a scan tool.Side object sensors, sometimes called collision avoidance sensors, are commonly located in the rear bumper. These sensors provide input for blind spot warnings, lane change alerts and rear cross traffic warnings. Static calibration with a scan tool is required when these are removed or replaced.Rear vision cameras will be located in the rear decklid, liftgate or tailgate, and act as either a backup camera alone, or part of a surround view system if the vehicle is so equipped. These cameras generally require a dynamic calibration, and no scan tool is required.A forward-looking camera is sometimes located behind the grille, and usually part of a surround view system. These too do not require a scan tool, but a dynamic calibration must be performed when they are removed or replaced.Different ADAS features may have dedicated control modules which can be located in various areas, often behind interior panels. As with most control modules, these require scan tool programming when replaced and, depending on the system, both static and dynamic calibrations may be required.The Haptic Seat Motor creates the vibration to provide a safety alert for blind spot, forward collision, lane departure, lane keep assist, parking collision and rear cross traffic warnings. These motors, sometimes called seat warning actuators, generally require no type of calibration.Cameras located in a sideview mirror are part of surround view systems. These require calibration when removed or replaced, but most of them dynamic, and no scan tool is required.The steering angle sensor located in the steering column is an input for lane keep assistance, and a static calibration is required with a scan tool any time it is removed or replaced, or any time a wheel alignment is performed.Last, but not least, is the front view, or forward-looking camera located in the windshield area. This camera is a vital part of adaptive cruise control, automatic emergency braking, automatic high beam headlights, forward collision and lane departure warnings, and lane keeping assistance. A scan tool and static and dynamic calibration are required after removal and replacement, but also after windshield removal or replacement, or any service that affects the ride height of the vehicle. TS

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