Master Sensor Diagnostics with the Voltage Divider Circuit

[@foxy1960]

That is the best explained video that I have seen on the way a sensor circuit works and how the engine management system reads it. Thanks

[@MechanicMindset]

Hope it helps!! Thanks

[@coulioouagninnin1297]

Bravo à vous. Moi je suis francophone est ce que vous disposez des cours en français aussi ? Merci d'avance

[@topadrenalina679]

hello master thanks for the info I HAVE A QUESTION DO YOU HAVE A COURSE ABOUT GDI GASOLINE ENGINES

[@MechanicMindset]

Hi, yes we have a course included in the membership! www.mechanicmindset.com/diagnostic-coach

[@trevormansfield6495]

An excellent explanation

[@MechanicMindset]

Thanks 👍

[@alrifainidal]

Wow how awesome is that. Thanks for this info

[@MechanicMindset]

Thanks, hope it helps!

[@jamiet10]

So on a 3 pin Hall effect crank sensor 5v reference and ground. On the signal wire are you saying you’d expect to see 2.5volts plugged in with ignition on?

[@MechanicMindset]

No, it would likely be either 5V or 0V depending on where the crank stops. If the engine is running, you’ll probably get 2.5V average with a voltmeter (but that also depends on the type of sensor)

[@fredautos]

Thanks mans for impacting alot to me

[@MechanicMindset]

Great to hear we’re helping make diagnostics easier! Thanks

[@careyautorepairs]

❤❤❤❤❤❤ I highly recommend this training it’s absolutely amazing. One of the worlds best teachers our Darren.

[@MechanicMindset]

Glad you’re enjoying the learning! Thanks 👍

[@mariankhaytu3239]

Hello, how did you log in app I’m trying to log in and it’s not working.

[@bellybell542]

Wow, I finally understood what voltage divider is. Thanks Bro👌👌👌👍👍👍

[@MechanicMindset]

Awesome!!

[@mandezadamz4556]

Woooooow i never thought i would understand how ECU works inside

[@MechanicMindset]

Cool isn’t it!? Simpler than you thought? Of course, there is a little more to it than this for the rest of the systems, but here is the core fundamental 👍

[@mandezadamz4556]

@@MechanicMindset of course you made it simple although there must be a bit complex stuff going on... Pls i have a problem if you could help I had a P1401 on my honda accord 2005 ictdi 2.2 I tried to clean the egr valve which seemed to have been in a stuck closed position After cleaning the check engine light turned off fin but the engine becomes soo weak i could even go up hill more than 1st gear (extremely slow acceleration) Is it a bad egr valve stuck open ? That i should replace? I also made a test for injectors and find the return is higher so the engine can no longer start unless I try really long crank still the engine was so powerful than after egr valve cleaning So what do you think that made the car a turtle

[@jr7858]

Concise 💯

[@fixerofthings]

If you take this one step further. When the ground connection is lost, the voltage at the point of measurement is the full 5 volts since there is infinite resistance. Conversely if there is a short to ground then the resistance is close to zero and the voltage at the measurement point is zero. Those two measurements are how the ECU sets codes for a sensor circuit being open or shorted. Either max voltage or no voltage. If there is no power to a sensor circuit then the ECU could misinterpret the zero volts as a short to ground.

[@MechanicMindset]

That’s right 👍 This is where the course goes next covering pull up and pull down resistors. We also put various resistive faults in the circuit and check the effect 😁

[@sheerwillsurvival2064]

So on scanner danner he says if you unplug one of the 5volt reverence sensors that you can find one that’s bring down the system. Ok but if all the sensors are on the system connected how can they all be 5 volts. Confused 🫤

[@MechanicMindset]

That might help if the 5V supply is shorted. Usually there are 2 or 3 separate 5V circuits. We did a lesson where we analysed an ECU schematic. Quite interesting!

[@sheerwillsurvival2064]

@@MechanicMindset 🤔👍🏻