eVCT Operation and Diagnostics by John Thornton – On-Demand Video Course
Electronic Variable Cam Timing (eVCT) Diagnostics for Toyota, Nissan, and Hyundai
Originally broadcast in October 2024, this 4-hour class is now available on-demand with unlimited access through the ASI website. Login credentials will be emailed to you by AESwave after purchase. PDF class manual included.
This advanced course by John Thornton focuses on diagnosing modern Electronic Variable Cam Timing (eVCT) systems, found on Asian imports starting around 2015. The class breaks down the operation, components, and diagnostic approach of these systems using scan data, lab scopes, and current probes.
Whether you're seeing related DTCs or dealing with cam phasing issues that don’t set codes, this class gives you practical ways to confirm whether the system is working as intended—or what’s not.
System Overview: How eVCT differs from older VVT/VTEC setups. New components: 3-phase cam motors, added cam sensors, VCT modules
Scan Tool Strategies: Interpreting scan data and DTCs, Understanding new PIDs for cam position and phasing
Hands-On Testing: Using scopes and amp probes to confirm cam phasing. Identifying electrical faults and confirming actual cam movement
Real-World Case Studies: Diagnostic examples from Toyota, Hyundai, and Nissan vehicles. Verifying repairs with learned techniques
Extras: Relearn and reset procedures. How to interpret results and avoid misdiagnosis
Class Info
- Length: ~4 hours
- Format: On-demand video access
- PDF Manual: Included with login
- Instructor: John Thornton
- Originally Aired: October 22 & 24, 2024
- Platform: ASI Online (credentials emailed after purchase)
About John Thornton
For 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.
