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Wheel Bearing Tech

How to Isolate the Issue and Service Them

Unless you have just started in the automotive field in the last few weeks, you likely have faced this work order. A customer is concerned about exhaust noise. You get in the vehicle and start the road test. The exhaust is quiet, but the familiar hum or growl of a wheel bearing is oh so familiar.

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The Diagnostic Value of the DSO

Digital Storage Oscilloscopes and Their Benefits

During my five plus decades of being in the automotive service and repair industry I have learned that diagnosing an engine performance problem, drivability problem or electrical problem is not an exact science. I have always favored symptom-based diagnostics, where once we have identified the symptom we focus our testing on a specific area

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Understanding High Voltage Leak Codes

Know Where to Look

High voltage (HV) is isolated from the chassis for good reasons. When any high voltage part has a connection to the chassis, that could spell trouble, depending on how much current the connection can carry. The engineers have cleverly designed circuits and strategies that can determine a “lack of isolation” and report that to your scan tool and set a warning light. How does that detection system work?

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Developing Diagnostic Strategies

It’s Important to Establish a Plan of Attack

Performing diagnostics is something many of us do each day, without much thought, but most seasoned technicians have a detailed diagnostic approach that they employ. They have an action plan — a diagnostic checklist — that they follow from start to finish with remarkable success.

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Are You Ready for 800 Volts?

Education Is Key When Servicing EVs

This article will compare the low voltage system to the high voltage system and explain how a 12-volt brain can get confused. It is essential that you master the principles of electronic controls, reprogramming, oscilloscope usage, reading wiring diagrams and all aspects of electronic systems used in today’s modern vehicles in order to transition into high voltage systems.

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Mastering the Multimeter

Use All Functions to Your Advantage

All technicians are aware that the scan tool holds the No. 1 priority in our initial diagnostic strategies. In my personal experience, the No. 2 tool in diagnostics is the DVOM, known as the digital volt-ohm meter or multimeter. In the event of an electrical problem, the DVOM is the essential tool.

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Engine Oil Technology

There’s More to Consider Than Merely Viscosity Numbers

While the installation of the correct engine oil may not be an important item to a customer when they arrive at our shop for service, the type of oil that is installed in the engine is beyond important. As technicians it is our job to ensure that the correct engine oil is installed that will meet or exceed what the manufacturer expects.

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Brake Caliper Service

Proper Inspection, Repair, Replacement & Hardware

Check the bleeder valve. If you suspect a bad caliper, it may be an issue with sticky/seized piston(s), but don’t jump to that conclusion right off the bat.

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Cause of the Silverado Shudder

Some customers driving a 2015-2018 Chevy Silverado may comment on a surging condition that is felt when driving. During diagnosis, the technician may determine this as a torque converter shudder. This condition may be caused by additives in the transmission fluid that may have depleted during vehicle operation. Some of these additives assist with regulating a consistent slip rate of the clutches.

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Spark Plug Tech

Interpreting Spark Plug Condition

The spark plug has a straightforward job to do. It’s responsible for igniting the air/fuel mixture in the engine’s combustion chamber initiating the power stroke. But this task is far from simple. The spark plug’s operating environment is extreme with combustion temperatures reaching 1500 F and peak cylinder pressure reaching 1,000 psi or more.

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