Automotive Electrical Diagnosis // 5V Reference circuit

Too many people are scared of automotive electrical diagnosis. You don't have to be! A lot of these basics are simple checks that can be done with minimal tools. In this video we are diagnosing a faulty 5v reference sensor circuit. Strap in guys, it's going to be a somewhat technical video, but if you are looking to improve your electrical diagnostic skills then watch the whole video!

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[patbaptiste]

I'm not an auto electrical diagnostic technician but i am an electronic technician turned marine electrician - seeking to enter the automotive electrical field...at home. I simply want to mention that this instruction makes a whoooole lot of sense to me.

[patrickliverpool]

I am an auto electrician for years. I am amazed with this troubleshooting skills. Thanks you so much I will always be on board with you.

[chibuzoranuonye]

I never knew you could wear a tie and teach about automotive electrical so well. I am so impressed. Thank you for the simplicity.

[kmlh]

Fleet mechanic here. Excellent video. Just about every mechanic I know struggles with 5 volt supply and j1939 problems, including myself. Just applied the first step to a Cummins diesel I was working on today. I found the problem in 5 minutes. Same approach I use for j1939 issues, just never used it for 5 volt supply. Again, excellent video.

[genewilliams]

Solid, clear explanations on how to diagnose the problems in a 5-volt reference system. You have spent some of your time in the automotive industry being an instructor. :)

[leeperry]

I particularly like the step by step writing results down. Easy to get lost and frustrated if you don’t.

[joseburgos]

Finally, someone that took the time to share this in a simple way to understand. Really really, THANK YOU. Now, I can finish up my 99' Suburban with a Crank but won't Start issue since about 3 years... I will update more later. God bless you!

[wk]

This is the Best ever diagnostic video, I have ever seen. Awesome instructor! Thanks.

[sollykhan]

Thank you so much for uploading this simplified instructional video, absolutely AWESOME, it has helped enormously with a very difficult job we had in our shop, but after watching this video, we nailed it rather rapidly, no better sight than the rear number plate of that eyesore disappearing into the sunset with a happy customer 🙂please post more, it most certainly deserves at least a Billion thumbs up. Bless

[ryanegan]

Thank you for this video I’ve been trying to diagnose the same issue with my own nine Sierra and I’ve been so lost because I don’t understand the system. This really helped and I will go through all these steps tomorrow.

[sirseven]

Thanks for the video! I am dealing with a rainstorm damaged system. Replaced fuseblock, gem, pcm, alternator, starter, and starter relay. Pcm was the last purchase and was not necessary. I replaced the alternator due to high frequency signal disrupting the CPS. After replacing I still have other codes for high voltage/malfunction for a few circuits. Turns out they all share 5v ref. All wires have .0, .1 ohms resistance. All wires show 5.05 volts. Chasing this down has driven me partially insane still love this stuff though.

[AngelDiaz-fneb]

This video is straightforward, systematic, concise, and thorough.👌

[.fox]

Im really glad i found this video, im going to use it on my stock 1989 2.3 mustang. I accidentally put the sensor in backwards because someone at the shop broke the connector, im not mad its old it happens. Then i tapped the battery together on the positive and negative when I was tightening the battery back up. Now i have to no acceleration issues a while later. I serviced the whole car so yes thank you for

[jamcarsrepair]

This is the best explanation and study guid to understanding 5v references, thank you for keeping it SIMPLE. I will subscribe

[JUSTINMARTINEZ-eb]

Thank you for showing us how to be a better technician.

[uncleronny]

Thank you, very helpful. I was testing with my sensors plugged in!

[clutchsp]

Absolutely great lesson. I'm having probs and will use your instructions to hopefully solve the issue. Virgin all original 2001 Focus no crank no start shutoff while driving dashes for odometer display smell of burnt electrical inside car.

[thebridge]

Thank you! I will be coming back to this video everyday!

[sheerwillsurvival]

I finally understand it thank you for putting this out . I was struggling with trying to understand how a 12 volt system could have multiple 5volt references. I was like it would share the voltage. This helped a lot . Great teacher 👊🏻

[gillianmilka]

The best instructor there's. You qualify to be a professor