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TO SEE DAILY VIDEOS OF TECHNICAL SITUATIONS AND LEARN MORE ABOUT ME, VISIT MY FACEBOOK PAGE @jorgeordonezautomotriz, OR CLICK THE LINK BELOW. ???? / jorgeordonezautomotriz Obtaining a scanner to communicate with the vehicle's computer is only the first step to make a proper diagnosis, after that the most important thing is knowing how to interpret the data to avoid changing unnecessary parts or wasting time on tests that are not related to the problem. Fuel trims or long-term adjustments are one of the most powerful tools for analyzing multiple electronic, electrical and mechanical systems of the engine.