Live Q&A: Making Sense of European Fuel Trim

Featured Course – August 2020

Course available OnDemand for the month of August. Live Q&A with AVI instructor Jim Wilson on August 28th at 3:00PM ET. Submit any of your questions through the Contact Teacher button and Mr. Wilson will address them during the live Q&A session.

This course, “Making Sense of European Fuel Trim,” will assist the technician with knowledge of domestic fuel trim diagnostics to expand his capabilities into applying those skills to European manufactured vehicles. The course will discuss new terms such as additive and multiplicative fuel trim and understand the different ways European cars display data as opposed to their domestic counterparts.

AVI instructor Jim Wilson will explain basic European fuel trim systems, diagnostic procedures, and give specific OEM examples of reading, logically diagnosing, and correcting short and long-term fuel trim issues.

Objectives

After this session, the student will be able to:

1. State why checking the oxygen sensor first is important
2. Differentiate between multiplicative and additive fuel trim
3. Understand when to determine fuel trim from the OBD2 side or the OEM side
4. Explain multiple long term fuel trim readings and when they need to be examined
5. Describe how fuel trim differs from each OEM
6. Understand the different types of enhanced scan tools and how they differ
7. List the importance of accurate data from the catalytic converter
8. State the different terminology used in European fuel trim as compared to domestic terms
9. Differentiate between closed-loop and open-loop fuel systems
10. Explain “logical” fuel trim diagnostics
11. Understand the importance of vehicle load on fuel trim diagnostics
12. Be able to interpret scan tool data and the applicable DTCs
13. Explain the importance of OEM Technical Service Bulletins