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| Name | The Trainer #67 - When Fuel Trims Won't Trim |
| Video Uploader | Video From Motor Age |
| Upload Date | This Video Uploaded At 07-07-2017 18:05:16 |
| Video Discription | In the May edition of “The Trainer” we explored how the ECM maintains fuel control. We also talked a bit about the factors that can cause fuel control to get out of whack. This month, we focus on what to do when it does get out of whack. System Lean DTCs are among the top 10 Diagnostic Trouble Codes technicians face in the shop and can be a challenge to correct. System Rich codes, while not quite as common, can often be even more difficult to isolate. It’s not hard to understand why the Engine Control Module sets these codes. That, of itself, is pretty simple. If Total Fuel Trim numbers exceed a programmed threshold, plus or minus, the ECM will turn on the Check Engine light. It’s the reason the trim drops or skyrockets that we have to figure out. Most of us start by looking at the amount of air getting in and the amount of fuel being added, don’t we? After all, if it’s too “lean”, it must be too much air or too little fuel. The opposite is true for a “rich” condition, or so you would think. What if the code is set for only one bank? What then? The ECM has to know how much air (by weight) is coming in and then calculates the amount of fuel (by weight) to add. It doesn’t do this intuitively – it has to be told, either by inputs from a variety of sensors or by its internal programming. Sensors that are misreporting may make the ECM “think” that the mixture is rich or lean, when it really isn’t. Even the software may be incorrect, at least under certain operating conditions, and a reflash may be the fix. We’ll cover all of those variables and talk about efficient ways to check for, and isolate, the REAL cause of these DTCs. Be sure to watch! Are you a professional technician or shop owner? Then sign up NOW for NO COST training at NACE Automechanika! Full details at: http://www.motorage.com/register17. BE SURE TO USE CODE "PMYT2017"! Be sure and SUBSCRIBE to our channel so you'll be the first to know when new information is available! @@@ FOLLOW US ON @@@ Facebook: https://www.facebook.com/MotorAgeMagazine/ Twitter: https://twitter.com/Motor_Age Instagram: https://www.instagram.com/motor_age VISIT OUR WEBSITE! http://www.motorage.com TRAINING FOR PROFESSIONAL TECHNICIANS! Motor Age Training: http://www.passthease.com NACE Automechanika 2017: http://www.searchautoparts.com/automechanika-chicago Click this link to subscribe to the print or digital edition of Motor Age! http://bit.ly/MotorAge_freesub_YT @@@@@@@@@@@@@@@@@ Due to factors beyond the control of Motor Age, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. Motor Age magazine (UBM Americas - Automotive Group) assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. Motor Age recommends safe practices when working with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this video. Due to factors beyond the control of Motor Age, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained in this video is the sole responsibility of the user and not Motor Age magazine or its corporate parent, UBM Americas. |
| Category | Autos & Vehicles |
| Tags | #automechanika | chicago | motor age | the trainer | automotive repair video | car repair | auto how to | how to fix my car | auto tech | auto technician | auto service professional | engine performance | auto electrical how to | automotive drivability | obd 2 | obd II | onboard diagnostics | auto computer | voltage drop | ohm testing | voltage testing |
