The Trainer #61 - DTC Diagnostics Pt1: How The ECM Thinks
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- Опубліковано 11 лип 2024
- It’s a New Year and a new direction for “The Trainer”! I want to thank all of the men and women who’ve shared how much they appreciate and use the material I’ve posted here over the last several years. Many of you have asked for a more detailed series, though, saying that it would be of even more help to you. You asked - we listened!
This year, I’m going to focus on producing a series of videos specifically for the professional technician. And we’re going to start with a series on diagnosing driveability concerns. This journey will take us through an understanding of the basic elements and dive into specific testing techniques you can apply right away.
In this first series, we start with exploring exactly what role the Engine Control Module (ECM) plays and the different ways it is used to control overall engine operation. I’ll show you how a Diagnostic Trouble Code (DTC) is born and how to use that knowledge to perform diagnostic tests of your own.
I’ll also show you how to test the ECM (or Powertrain Control Module if the transmission controls are contained in the same unit) power and ground circuits - one of the very first things you have to do before you can condemn one as “failed”. Once you understand that, you can apply that same test method to verifying power and ground circuits on any module on the car.
Yes, I have a lot planned for you in this first series of videos of 2017. Just one more way we here at Motor Age strive to live up to our motto of “advancing the automotive service professional”!
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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. - Авто та транспорт
I can’t understand why these videos only get 15K views. Way more info than most of the crap on UA-cam! Please keep going!!
Me either! :-)
Help spread the word and point your friends our way!
@@MotorAgeMagazine I've heard one person say that if you don't have the Check engine light on but trouble codes show up, that it is the ECM. I haven't heard that information from anyone else. You ever heard of it?
@@peacepoet1947 No. But older OBD I vehicles were hard on ECMs and are more likely to have an issue than newer vehicles.
@@MotorAgeMagazine I'm looking into other videos about teaching a new ECM after installation. Lots of different opinions on turning the key on and off and then turning the key on for 11 minutes and repeat three times on the 94 GMC Sierra C3500 with a 7.4 engine. When I purchase this ECM, I don't want it to be a fuse for a problem that I have NOT found in the wiring. I appreciate your input. This is all new to me. I've had my 72 Chevy El Camino ever since February 15, 1975.
@@MotorAgeMagazine 1975 and have by myself installed two tear ends and three transmission. I've rebuilt the carburetor two times before I decided to get an Edelbrock, Street Preformer and electronic distributor. Love my 72 Chevy El Camino.
Good Afternoon Pete Meier motor age have a great day,and take care 👍
Great tutorial very helpful video thanks👍
From Nick Ayivor from London England UK 🇬🇧
Great video. Thank you. I would like to second a previous comment- I often notice fellow technicians forget to ensure there is a load on a circuit prior to checking for a voltage drop. Excellent point to drive home.
Excellent video dear sir. Very clear and precise explanation clearing all parameters involved. Regards,
Nice job Pete. Very informative and useful. Too often I see tech's check power and ground but not under load.
Thanks Pete, Great Job ..
Nice work your videos are always so solid and have much Integrity to them.
Thank you John!
Hey Pete, could you do a video on how to turn a Delorean into a time machine? 2020 really has been a disappointment
13:13 computer is the customer lol ! That a good one ultimate customer for sure thanks Pete appreciate your videos your the ultimate trainer.
Thanks Pete, for sharing such valuable information throughout this year that is about to end.From Puerto Rico I wish you and the whole family of "Motor Age Magazine" a happy new year 2017!!!!!!!!!!Many blessings to all! Thank you.
Great job
Nice job friend.
Thanks so much teacher. Regards
Helpful. Thanks.
Very useful program...
Great video.
Thanks! Glad you liked it.
I like those information they are very good
I was always taught by major engine manufacturers
ECM has 3 priorities
1 emissions
2 Fuel economy
3 performance
In that order
ECM s do many more things than just emissions
Factory trained tec
Cummins
Detroit Diesel
Catipiller
Mercedes Benz
Peterbilt
Mack
Freightliner
Paul Tavres If fuel economy is poor, what happens to emissions? If performance drops off, what happens to emissions? Just sayin’...😊
Very well done and informative. Kudos to a man who really knows his stuff AND knows how to communicate it.
Information is good
Thanks boss
Thanks for watching!
great job pete, thanks.
technically great job
from Sunil Ghorpade , Mumbai India
Sunil Ghorpade Thank you!
Your camera wasn’t showing half of your probing QUESTION: we never saw what to do if the reading revealed a bad ground whether power or signal. Was that what all those wires are, is grounds? Please explain… and THANK YOU❗️❗️
A computer does not think, it is programed with a series of loops that are designed to either go into the null and proceed to the next item on its list or if within parameters it will optimize with the command that it has mathematically come to the most optimal for where it equations has led it.I know we would all like to have them as a friend,but we must always remember that they are told what to do by a series of strokes on a keyboard,then looped into doing the same thing over and over. Good video though
Sir maybe it's better if you illustrate on a white board or paper. where the connection is what the voltmeter goes to and the measured voltage coz we can't see the reading in the meter
does it mean that ECU has power to energize the radiator fan relay even if the engine is off ?
Sorry for the late reply. On some models, yes - the ECM can turn the fans on even if the engine is off.
Love the video but had one question how would you go about doing the reading when the ecm is under the dash
Like your videos, but please cut back on the volume on the intro music.
It seems to be based on the binary system. ?
Hy do you hawe a pdf of obd2 0-10 moduls and ecm and other systems so i could read maybe more in depth?is there a video in fixing most comon obd2 codes?thanks
Around 27 minutes in I'm a bit confused because you said the voltage drop on the sensor return circuit should be lower than the voltage drop on the main power grounds ultimately I would expect them to be pretty much the same or the power ground voltage drop a tad bit lower ultimately everything has to get back to the battery so if they were the same I would think there's no voltage drop within the system of the computer from the sensor return going back through the main ground to the battery now in fact if the voltage drop was reading point .2 volts (.2)at the sensor return and the main power ground point zero six (.06) I would suspect a problem on the sensor return circuit Maybe I misunderstood you
Is a launch CRP 129e engine analyzer okay to start with?
Where is the coil module located in the pcm with the one piece cover
How do you check the ecm if it working properly
could you do a video on can bus testing
We'll get that on the list Phil! Thanks for the request...
I know just enough to be dangerous lol. I know your supposed to see 2.5 volts at idle one goes up a volt other down. disconnecting modules to eliminate a bad module pulling a system down. just want to see some good testing. good work man
I would love to see a video on can bus testing as well, Pete
#61 the trainer
Chris Canty The information is available at www.motorage.com. Just search "obd II". Does that help?
Chris Canty Or are you looking for the slides used?
Yes
Chris, you can request the slides by writing me at pete.meier@ubm.com. Please include the intended use of the material in your request.
I have a 2000dodge neon I just put a use computer in it how do I get it programmer
Dealer
Dealer
How do I find a good service information system as a DIY technician? I can’t afford ALLDATA for $200.00/month.
Both Mitchell 1 and Alldata offer DIY versions of their service. Just Google Alldata DIY
@@MotorAgeMagazine Thanks, seems like the manufacturers should supply the vehicle specific information for free.
could you send me that info in a pdf file
Chris Canty What exactly would you like me to send?