Drivability Diagnostics: Turning Off the MIL

The Engine Control Module, or ECM, has one job – to protect the catalytic converter so it can do its job of reducing emissions. Problem is, there are numerous faults that can occur that will keep the ECM from doing that job. And when it detects such a fault in any of the systems it oversees, it will turn on the Malfunction Indicator Lamp, or MIL, also referred to as the “Check Engine” light.

While the OEs have come a long way in defining faults, it is still up to us, the professional automotive technician, to determine the actual cause and effect a proper repair. If we miss the mark, the original fault may return or a new one emerges with both scenarios resulting in another MIL illumination, and a disgruntled customer.

Join Pete and G. on May 21, 2022 at 6:00 p.m. Eastern for an informative webinar on how to effectively deal with issues related to the Check Engine light. Topics covered will include:

  • An overview of how the ECM monitors the systems and decides when a failure has occurred AND how to use that information to improve your own diagnostic efficiency.
  • Using resources you may not have considered or even knew existed in your diagnostic process.
  • Using all the tools you have at your disposal; scope, DVOM and scantool, to isolate and confirm the cause.
  • And more!
  • Thanks to Snap-on Fast-Track Intelligent Diagnostics, this webcast is offered at NO COST!

Register TODAY!



Founder/President of Technicians Service Training (TST), G. Jerry Truglia has extensive experience in the automotive field as a technician, service manager, shop owner and technical writer. He is a senior curriculum developer who provides training programs for automotive and truck inspection and repair programs. He has provided on-board diagnostic system, OBDII and automotive training all over the country. He is the owner, curriculum developer and instructor for Automotive Technician Training Services (ATTS) in Mahopac, N.Y.


Pete Meier has been in the automotive aftermarket for 50 years, starting as a service station attendant while in high school. He’s earned ASE Master Automotive certification, has wrenched on just about everything that runs on gasoline, taught in both private and public vocational schools, trained technicians at regional and national events, and served as the technical editor for Motor Age magazine and later as the EBM Director of Digital Content. During his tenure at Motor Age, he led the publication into the Internet age and was the first to bring an industry trade publication to social media and created the Motor Age YouTube channel, now with over 109,000 subscribers. He was also the first in the industry, in partnership with TST, to host “live” training webinars in a shop atmosphere, making online training as close to a “hands-on” experience as possible. Today, he is the Training Manager (Social Content) for Dorman Products and is excited about the opportunity to bring even more resources to our industry’s working men and women, to help them face the challenges of today’s (and tomorrow’s) technologies and to continue his personal quest to “advance the automotive service professional.

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Course Includes

  • 1 Lesson