Automotive repair: Test Like The Engine Control Module Does Training Video

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Duration: 8 minutes and 49 seconds

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John Q. Customer comes in complaining that the "Check Engine" light is on. Drivability may or may not be affected depending on why the light is illuminated. When facing this type of repair, consider whom you must really satisfy in order to make the repair successful.
 
The same module that turned the light on in the first place is also the same module that will test the quality of your repair. Even if your human customer can't tell if the repair was correct, you can bet the module can. And it will turn the MIL (Malfunction Indicator Lamp) right back on if it isn't happy. So it pays to understand how the ECM performs its system tests, and to use that information when performing diagnostic tests of your own.  And that's the topic for this month's edition of The Trainer! 
 
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