Late Model Fuel Trim Diagnostics& Case Studies by John Thornton

Fuel trim issues are a constant in driveability diagnostics. And because fuel trim and misfire codes so often show up together, the hard part is knowing what you're actually chasing.

This class works through a series of fuel trim and fuel control case studies, using scan data, freeze frames, bidirectional controls, and scope testing to pin down where an engine is running lean or rich. Every concept is tied to a real car, and these examples are what you’re already seeing in the shop — it’s all about a clear sense of direction to confidently solve fuel trim issues.

Discussion topics:
• Fuel Trim Fundamentals
• 2017 Chevy City Express 2.0L P0101
• 2012 Honda Civic 1.8L P0171
• 2010 Lexus RX350 3.5L P0158
• 2019 Toyota RAV4 Hybrid 2.5L P0171
• 2016 Nissan Altima 2.5L P0300 & P0301
• 2017 Dodge Ram 2500 6.4L P0171 & P0174
• 2011 Ford F150 3.5L P0171 & P0174
• 2014 Dodge Challenger 3.6L P2097
• 2018 Ford Taurus SHO 3.5L Multiple Misfire DTCs / Fuel Trim Imbalance Bank-to-Bank

Instructor John Thornton

Class Length approx 1 hour

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

Watch the Live Stream
Before the class, Zoom will send you three email reminders: one week, one day, and one hour before the live stream.

Watch On Demand
A few days after the live broadcast unlimited access to the video recording will be available at the Automotive Seminars website in the "My Video Library" section of your account. Login credentials will be emailed to you. If you already have an ASI account use your existing login.

Watch with Your Team
Included with registration, shop access for all your technicians so they can watch the live stream or recording at work or home.