The Trainer #20: Test Like The Engine Control Module Does

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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 the August 2012 edition of The Trainer! Click this link to subscribe to Motor Age! bit.ly/MA_YT_fr...

[@MotorAgeMagazine]

Glad to hear it. We'll be doing a live discussion of OBD II modes and monitors on July 24 (2012).

[@nickayivor8432]

Thanks 👍 Pete Meier motor age Take care and have a great 👍 From Nick Ayivor from London England UK 🇬🇧

[@chemicalrick4000]

Thx for all the great vids. I a new subscriber and use your channel for my late model Volks.

[@MotorAgeMagazine]

So do we! And we've made the offer, but we think Scannerdanner is way too busy to add writing features for us to his list of things "to do"!

[@Mr99RICH99]

that can be a little misleading because o2 circuit problems can have the inexperienced person chasing down a wiring problem when in my case they have always been a shorted circuit inside the o2 sensor itself

[@jtech23]

have you checked out Scannerdanner's channel. He does lots of videos testing systems just like you said, testing like the ECM does. I think he would make a great addition to your team.

[@geraldmartin3625]

Motor Age I am newly employed at an auto wrecking yard. I am having problems locating the Body Control Module. Do you have a video on this subject you could refer me too, or could you make one?

[@geraldmartin3625]

@Pop's Garage Thanks for the tip!