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原文传递 THE TRAINER #130: DIAGNOSING DTCS - DON'T FORGET THIS IMPORTANT STEP!

题名：	THE TRAINER #130: DIAGNOSING DTCS - DON'T FORGET THIS IMPORTANT STEP!
正文语种：	eng
作者：	PETE MEIER
摘要：	Ever find yourself trying to diagnose a Check Engine light complaint and you just don't seem to be getting any closer to the cause, even after hours of work? Maybe it's because you didn't include a very important step in your diagnostic process early on.You're doing everything right in the diagnosis. You've identified the DTCs causing the Check Engine light to come on, you've read up on what each means, what the criteria the ECM uses to set the codes and you've also read up on the system operation so you fully understand how it works and how to test it.But even after hours of trying, you don't seem to be getting any closer to the causes.If not, you may have missed a critical step - one you should take in every troubleshooting task you are assigned.What is that missing step? It's checking for any related Technical Service Bulletins, or TSBs, that the manufacturer may have issued. Sometimes, it's a new part that is used to resolve a common problem, but most times - in fact, up to 70 percent of the time when it comes to engine management - it's a matter of re- programming the controller. And if that's the case, you can diagnose all day and never find anything wrong!
出版年：	2022
期刊名称：	Motor age
卷：	141
期：	9
页码：	72-72