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> Lab Scopes Accessories > Variable Valve Lift Diagnostics, by John Thornton


Variable Valve Lift Diagnostics, by John Thornton

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This class covers two types of Variable Valve Lift systems: Hydraulic and electrical actuators. VVL sometimes works in conjunction with VCT but it is an entirely separate system that requires its own game plan to diagnose.

Topics Covered
• Operation of VVL
• Modes of Operation
• Useful and necessary specifications
• Strong emphasis on testing; diagnosing via scan data & scopes
• Find VVL issues before disassembly
• How to separate VVL issues from other engine mechanical problems
• What to do when manufacturers offer little to no scan data
• Case studies will include a Chrysler 3.6 L Pentastar 2nd generation & an Audi 4-Cylinder with “Audi Valvelift System”

Technicians will understand how the system works and have a diagnostic process ready to go for these popular engines that will be in your shop. You can apply similar techniques to other manufacturers. The main goal of this class is to show how to define the problem before disassembly.

Instructor John Thornton

Class Length 2.5 hours approx

PDF Class Manual included, to be downloaded after logging in to watch the video.

Streaming Delivery
Watch it live on the dates listed above; you will receive invite emails from Zoom.

On Demand Delivery
About a week after the livestream, watch the recording whenever you want at the ASI site! Login credentials for the ASI site will be emailed to you from AESwave.

About John Thornton
John discusses how to ground your scope during a seminarFor the past 20 years, John has provided the automotive aftermarket with hands-on and classroom training on a wide variety of topics, including: engine and transmission driveability, module programming, bus communication issues, and electrical diagnosis, lab scopes and scan tools. In the process he has become the foremost trainer in the nation for professional technicians, school instructors, and technical trainers.

The information and techniques John presents have been gleaned over 30 years in the Chicago area as a diagnostic technician, working in the bay and now as mobile tech. He is a mechanical engineer and has an extensive electronics background.

"If you go to just one class, ya'gotta go to John's class, no matter what the topic is."  Bob in IL.

"John is the trainer that other trainers are measured by." Harvey in BC.


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