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> Lab Scopes Accessories > Engine Variable Displacement by John Thornton


Engine Variable Displacement by John Thornton

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Variable Cylinder Management systems deactivate/activate specific cylinders under different loads to increase engine efficiency.

Combine high mileage vehicles, engines without proper maintenance and variable displacement systems and you will have driveability & DTC issues in your service bays.

Topics Covered:

• The popular GM DOD/AFM, Chrysler MDS & Honda VCM systems
• How to readily verify you have a Variable Cylinder Management problem without disassembly.
• Separating mechanical & hydraulic problems from control issues.
• Functional scan data testing.
• Solving rough activation/deactivation problems.
• Simple test to prove your misfire is a Variable Cylinder Management issue.
• Help with intermittent problems.
• Some Variable Cylinder Management repairs require extensive R&R and need to be diagnosed correctly the first time.

This class delivers a solution to a variety of Variable Cylinder Management problems and will help you diagnose these systems very well.

Instructor John Thornton

Video Length 4 hours approx

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

Streaming Delivery
- On the day of each live broadcast an email will be sent to you from ZOOM an hour before the event begins.
- One week after the live broadcast, the recordings from both nights will be combined into one video and posted into your account at ASI. Login credentials 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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