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> Lab Scopes Accessories > Fuel Trim Diagnostics by John Thornton


Fuel Trim Diagnostics by John Thornton

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Almost every driveability diagnostic requires the use of fuel trims which makes interpreting fuel trim values a critical skill for technicians. This class is all about giving you a sense of direction to solve fuel trim codes and issues.

The answers to these three questions will help you get started with Modern-day fuel diagnosics:
1. Under what operating conditions is the engine rich or lean?
2. Which cylinders in the engine are lean or rich?
3. Can you trust your fuel trim numbers?

Topics Covered
• Quickly identify under what conditions an engine is rich or lean.
• Determine if your fuel trim issue is single cylinder, one bank, or the entire engine.
• How to prove the PCM is doing the right thing and that the fuel trims are accurate
• Create a diagnostic direction with scan data clues.
• Using the load PID
• Diagnosing injector function with scan data
• Scan data clues to a bad MAF
• Recognizing the cause of fuel trim imbalances
• The importance of the rear oxygen sensor
• See how your scan tool can tell you what diagnostic tests need to be performed.

The instructor will demonstrate via case studies how to interpret and use fuel trims to diagnose a variety of rich & lean concerns.

BMW, Chrysler, Ford, GM, Nissan and Toyota case studies will be presented.

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 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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