Inside Fuel Trim – How To Make Money With These Important Data PIDs

Overall drivability and vehicle performance is dependent on the engine receiving everything it needs in the right amount and at the right time. When that doesn’t happen, the Engine Control Module will try to compensate – and that typically shows up in the STFT and LTFT data PIDs you see on your scan tool. But does a correction ALWAYS indicate a “lean” or “rich” fuel condition? Or can the numbers be affected by something else?

Join Pete and G. at 7 p.m. EST on Feb. 29 as they explore what fuel trims are, what affects them and, most importantly, how to use them in your everyday diagnostics!



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.

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