This Old School Cadillac Has AC Issues (Part 1 Why You Need A Scope!)

Рет қаралды 8,786

Күн бұрын

This series is long overdue! Y’all know that we pull out the scope quite often in our videos, and for good reason. But it’s time to really show how efficient it can make you when diagnosing vehicles. That’s what are aim is with these videos. We will start with an unusual, but cool diag where we avoiding having to pull out some ancient scanners that we would have to brush the cobwebs off of.
This series will be quite extensive. So feedback will be important. Let us know what you are interested in seeing on scopes. This will help us tailor the content to what is going to help you guys. We are really excited about this one! We hope it helps! Enjoy!
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Пікірлер: 154

@elcheapo5302 20 күн бұрын

Hi Sherwood. As a home gamer learning to use his scope, I'd like to see it used on a primary/secondary ignition coil, relative compression, cam/crank correlation, and can bus lo/hi. Preferably including the scope settings and why they're used. Thanks!

@D2O2 18 күн бұрын

Check out Scanner Danner. No need to reinvent the wheel per se.

@TonyRule 19 күн бұрын

Oscilloscopes are absolutely invaluable. When I was an apprentice in the very late '80s and early '90s, I was the only one interested in the oscilloscope function of the new Krypton tunescope that was purchased by the dealership I started at. I took that manual home many nights and tried to absorb as much as I could and put it into practice. There wasn't a lot of opportunity to use it there, as it was a new car dealership, but after I moved jobs, it really became handy, and in my 3rd year I became the go-to guy for tricky (intermittent mostly) diagnosis', after I convinced my new boss that we needed an oscilloscope (I forget what that model was but it was spendy and they put a considerable rate surcharge on for its use).

@bennyrussell5551 20 күн бұрын

The old SUN SCOPE in the 60's - 70-s was great.

@johnweiland9389 20 күн бұрын

Cars where much simpler. Carburetor, mechanical ignition controls. Not anymore. I got buy with a tach/dwell, vacuum Guage, and a timing light. 90% of what I know is obsolete.

@TonyRule 19 күн бұрын

@@johnweiland9389 *_"90% of what I know is obsolete"_* Come the EMP, it'll be indispensable!

@WalkerSmallEnginePerformance 20 күн бұрын

The best tool to learn about and understand electricity and electronics because it allows you to “see” it. You should show the relationship between ckp, cmp, primary ignition, injector control, etc.

@sheerwillsurvival2064 20 күн бұрын

Use the scope to check cam and crank correlation. And to see if vehicle is off a tooth

@garysgarage3669 19 күн бұрын

I'm just a DIY'er. A while back I was working on a transmission issue. I was fairly sure it was the transmission module, but did't want to make $1,000 guess. $800 for the module/valve body and $200 to have it programed. I didn't have a scope, so I bought a 1 channel scope and this little thing was awesome and worked great. Fixing my families cars is expensive, because I pay for everything, parts and all.

@TonyRule 19 күн бұрын

You forgot to finish the story about the transmission module! Had you guessed right?

@garysgarage3669 18 күн бұрын

@@TonyRule It was a guess once I got my scope and saw that the transmission module was not communicating with the other modules. Yes it was the module.

@thisisausername1265 20 күн бұрын

The visual of the scope makes understanding voltage drop easier for people.

@weldingjunkie 20 күн бұрын

Scope videos are my favorite Sherwood great job. I’m very proficient reading diagrams and using scopes but always pick up tips here and there. Something about scopes always fascinated me.

@joshuamyers3185 19 күн бұрын

Good idea for a series. As you do these scope videos please explain what and why with each "lesson". For example if you scope a low pressure pump explain how you can count the commutators and measure rpm or ramp up of amperage. I do believe this is the most missed part of scope videos. Understanding why the vehicle is faulty bc of said part is great but understanding why you called the part for failure is most valuable. Good luck with videos and thank you for all the videos out to date.

@ws2664 20 күн бұрын

Scopes are a must, but most shops only have a 4 channel scope, Pico, Snap On ect. Try not to use more then 4.

@theroyaltyautoservice 19 күн бұрын

Totally understand that. That is part of why we are doing this. We hope it inspires shop owners to make the investment into a tool like this so that their techs can properly diagnose more difficult issues and set themselves apart from other shops. Yes it’s an investment, but it pays off in the long run. This isn’t something a tech should have to buy. It’s the responsibility of the shop. That’s our opinion at least.

@moebassidji8306 2 күн бұрын

just found your channel by pure luck,appreciate the knowledge and the effort to offer that to the public, subscribed.

@cheapers1952 15 күн бұрын

I THINK YOU DO A GREAT JOB EXPLAINING A LOT OF THIS STUFF AND JUST TO BE A SMARTASS THE CONCEPT OF USING A LAB SCOPE ON ELECTRIC CARS IS DEFINITELY GOING TO BE ESSENTIAL

@sheerwillsurvival2064 20 күн бұрын

That ATS is awesome

@TheMapleDaily 20 күн бұрын

Love that you spend the time to teach and show us how AND why its doing what its doing. This is an awesome Automotive Technical Seminar!

@ThunderbirdRocket 19 күн бұрын

Well said . Agreed ! Sherwood seems dedicated to the task of getting us viewers proficient with the scope and all aspects of auto repair .

@LuisRamirez-wr4of 20 күн бұрын

Im new on the use of osciloscope and this is gonna be really helpfull thanks great videos

@dogdooley4495 20 күн бұрын

I'd love to see a video on how to properly use a scope. Any recommendations on an affordable scope for home diagnostic use.

@chaddombrowski4014 20 күн бұрын

pico makes a 2 channel scope 2200 series. I think they are $100. Not for automotive but with a little configuring they will work wonders. I use it a lot.

@mandytuning 20 күн бұрын

@@chaddombrowski4014thats what i use and work great. But looking for the mt8 pro, its cheap and software is best out there.

@theroyaltyautoservice 19 күн бұрын

What is your definition of affordable?

@dogdooley4495 19 күн бұрын

@theroyaltyautoservice To me affordable is under $500 complete. Of course this is all subjective.

@1MiketheMechanic 19 күн бұрын

Mechanic Mindset just did a video on the limitations of scopes affecting the signal called "Don't Be Fooled! Crankshaft Sensor vs Oscilloscope". It's worth a look to understand what you are buying and if that cheap scope is really worth the money.

@lyndleshelby6291 17 күн бұрын

You might do a video on the various ways that you tap into the wires/connectors/etc.! Love the series on scopes idea!

@toms66gtstang 20 күн бұрын

Great idea to do this scope series. I bought a cheap hantek, to get my feet wet. I've only used it a few times, as I'm not actually a tech. I'm an internal service advisor at a large used car dealer. I do get involved with some deep diags, to help my guys. I really need to spend time learning how to properly set it up. One suggestion is using it to test signals & PWM signals from things like rear hatch motors. Thanks for all your work putting these videos out.

@andrewnevermind4902 20 күн бұрын

Great video for anyone working on cars. Looking forward to watching this. FJB. 🇮🇪

@dhood15277 20 күн бұрын

So important on older cars that I like so much.

@AaronMDO 20 күн бұрын

Awesome work. I never really thought of using the scope for AC diags.

@DeTyler 19 күн бұрын

id love to see some diagnostics on 3 phase fuel pumps. like how you hook up the scope

@TheWrench97 10 күн бұрын

Back in the day a meter is how we tested the pressure sensor while looking at the gauge set :)

@Mr2004MCSS 20 күн бұрын

Great series and I'm looking forward to learning more about how to use a scope in different scenarios.

@victorgonza4528 20 күн бұрын

Keep them coming man

@johnpastor8595 15 күн бұрын

Love to see primary and secondary ignition waveforms. Good and bad

@anthonysova7117 20 күн бұрын

Agreed Scope is very important in determining diagnosis Cheers Sherwood

@chriscorts3337 20 күн бұрын

Bring it on. Thank You.

@Joesciorilli 20 күн бұрын

Use my Ats scope everyday it is the best piece of equipment I have

@shaunblakemore7150 19 күн бұрын

Good job, how about relative compression?👍

@ThunderbirdRocket 19 күн бұрын

Great 👍🏼 topic / series . I’m excited / thankful !! 👊🏼 🔥 💻 📈 👑

@rayp.454 20 күн бұрын

I'm excited about learning more about scopes and their capabilities. Currently using a 2 channel Pico and still learning. I just work on my own and my family's cars. Non profit lol. But I enjoy working and learning about repairs. Great channels like yours and the other major you Tubers are Awesome. Can't wait to see more!

@user-bn3gy5wl2r 19 күн бұрын

I’ve always been interested in the theory of using a scope and never had the chance or hands on opportunity to learn. Great video.

@ejengstrom 19 күн бұрын

I understand what you're saying about scopes being vital. I think it is most helpful to differentiate between VISUALIZING with a scope versus measuring with a multi-meter. A labscope/picoscope is a great way to visualize an issue and display events over time, but it only supercedes a meter reading, which supercedes a test light. I teach three methods and require a scope when behavior is intermittent or irrational. Yet an irrational reading is simply understanding the expected range under load and not under load. Shop owner here, diagnostic lead and service writer.

@ejengstrom 19 күн бұрын

It would really help teach novices if you talk less about the setup, but prep them in advance by taking an image of the ERD and circle the colors you are going for, then show them setting up the channels and lead types on the car. It's helpful to show the process. I appreciate the effort that goes into these.

@hudsonm748 20 күн бұрын

I love this video, did an awesome explaining everything. Super jealous of the 8 channel scope, wish I had the money for one haha

@siccknocks1 14 күн бұрын

EGR valve sprinter, sooted EGR valve, and a clean EGR valve.

@823Steve 20 күн бұрын

Looking forward to this series.

@juliancortes1259 19 күн бұрын

Can you come out with a part 2 on the a/c series. I have trouble understanding the gauge pressure readings and you do an absolutely great job explaining things in dept

@MarzNet256 20 күн бұрын

Cool. I just picked up a scope (pico 2204a) for DIY automotive...it is awesome. So far, I've done CAN, L and K line networks (using an obd2 breakout box and scan tool). I also did, battery voltage on startup, and put a lead on a US quarter on top of a coil to get a waveform (you guys should do a video on these) There is so much info in the waveforms when you learn how to read them.

@juanfgonzalez2039 20 күн бұрын

For someone that wants to get in scope Diagnostics was a good Affordable scope to start with

@theroyaltyautoservice 20 күн бұрын

We will do a video with some more affordable options for y’all!

@juanfgonzalez2039 20 күн бұрын

@@theroyaltyautoservice thanks love what you are doing Having the patience to teach your employees are lucky to learn from you happy 4th of July

@scotts4125 20 күн бұрын

I have a handheld 2 channel Owon HDS2102S. It's a great tool and very affordable. Videos all over YT on how to use it.

@k6ul 20 күн бұрын

You will get a lot of interest in affordable scope options. The full featured 4+ channel scopes are really out of reach for a small low volume operation. And, if you get into the lower cost ones you might touch on floating ground vs shared ground inputs. It can mess a lot of techs up, especially when trying to learn new fundamentals.

@sheerwillsurvival2064 20 күн бұрын

Most excellent 👊🏻

@randyduncan8863 20 күн бұрын

Yes these videos will be very helpful for all of us seriously it will

@luther6o 20 күн бұрын

well done

@rodvan-zeller6360 19 күн бұрын

A scope is a window into the circuit. Suggestion for a video, scope can bus and introduce different faults to see symptom, wave form and what codes set. Short to ground in both can high and low simultaneous and separate, short together, short to power, introduce voltage spikes. This project familiarizes and gives direction when diagnosing problem cars. Thank you for considering it

@BIGDAVE5352 20 күн бұрын

I worked on these Cadillacs back in ‘85 during my apprenticeship at Bob Chango GM in Key West,FL. right out of high school. He sold the whole GM line. I eventually became a master tech within the 8 years working at 3 GM dealerships. The coolest diagnostics feature with these C, E & K body Cadillacs was that you used the HVAC control panel to read codes and data for the ECM and BCM. And yes, I replaced a bunch of those cooling fan control modules under warranty and customer pay in those days. Great memories!

@mandytuning 20 күн бұрын

Remember that times, also the Mitchell books library was my training center.

@jeffselander8567 20 күн бұрын

Me too Miss c&k body cars a lot now days

@user-sw1oe6pg5k 20 күн бұрын

Yes, on a Fuel-Pump for a 2003 Chevrolet S-10 4.3L AND a 2.2L Motor’s… And WHY these Engine’s (sometimes) have a “Rough Idle” Thank yoy

@michaeldiaz6308 20 күн бұрын

Anything on how to use a scope would be awesome! Happy 4th of July, guys!

@theroyaltyautoservice 19 күн бұрын

Same to you!

@leftyspinn 19 күн бұрын

I'd love an explanation of ignition waveforms. Primary and secondary and what it looks like when various problems cause a missfire. High resistance, carbon tracking, open windings, shorted coil, lean etcetera

@firstatv 20 күн бұрын

I work at a Honda dealer and we don't use scopes and in the training center doesn't teach us anything with scopes. Now on the other hand Toyota has a pico scope we can add the the TIS and we can do indepth stuff. I want to get the little one channel scope from aeswave the uscope and use that to head diag a misfire on Hondas. To see if it's a coil/spark plug or valve problem. Maybe compression. If you can do a video on that would be great! Happy 4th of July!

@mandytuning 20 күн бұрын

Get a pico 2204, amp clamps, and go to rotkee and buy for dirt cheap all test sensors . you can do everything.

@samvish6363 20 күн бұрын

Most scopes is 4 ch so this means you have to look at the signals twice wish I could afford a scope like yours thankyou for your videos

@rwrobs777 20 күн бұрын

Scopes for the WIN !!

@robertfrancisco1193 20 күн бұрын

some techs if they do have a scope, it would be a 4 channel . i would start off with simple diag. and work your way up to more advanced. explaining how to set up for the newer techs, just my 2cents! but this is your show have fun with it. keep up the good work i wish there were more shops like yours.

@ablackformula 20 күн бұрын

I cut the ends off of my chassis ears microphones and put them on the scope. Gives a visual when diagnosing wheel bearing noise and certainly eliminates diagnosing by ear. Any in-cylinder pressure transducer, and pulse sensor diag videos would be welcomed, too!

@johnny535is 20 күн бұрын

Sherwood , really enjoying the content and knowledge you guys are sharing . I bought a small a small oscilloscope and would like to see how to use it to troubleshoot anti skid systems properly . I had to do a shotgun repair due to time restraints at the time but thought this tool would have really helped me diagnose the problem.

@theroyaltyautoservice 19 күн бұрын

What scope did you get?

@tylerparsons9626 19 күн бұрын

I’ve scoped fuel pumps before and found worn brushes but I’ve always been curious how to properly calculate RPM.. throwing my uscope on a blower motor has turned into one of my favorite tests.. that’s a good one to show. In cylinder using a wps500 or something similar would be cool to see as well.

@RATCHETMAN1001 18 күн бұрын

ntc , negative temperature coefficient sensor. most all vehs use them .when temp goes up they work opposite of what u think. when hot more current flow dropping the voltage pressure. yes voltage is only pressure. use a scope on your 110 out let and you will see its not 110 peak pressure, the power of the scope is awesome and getting better with all the new add ons.

@ozziesheppard17 20 күн бұрын

Just wanted to say your content is great, other shops sometimes give off bad vibes or are a little too "sales oriented" but you are about doing a clean, nice job. Very good overall.

@theroyaltyautoservice 19 күн бұрын

Thanks for the kind words! Appreciate the support!

@survivingga 19 күн бұрын

I think Snap On really could have changed the amount of scope usage if they would've kept the Vantage line available and AFFORDABLE. I like the series because if the trade is going to improve it's image, this is the way forward.

@zarikparsanian3940 19 күн бұрын

Great video, I would like to know how to capture a direct fuel injector waveform on most modern cars, And distinguish between a good and bad pattern, Hope you come a cross one soon. Thanks again for your efforts to create great videos.

@billmonroe8826 20 күн бұрын

I think they will be great videos. The more a scope is used the better.

@Santiago_Ordonez_ 19 күн бұрын

Nice. 👌

@jtjones4727 19 күн бұрын

I hope I can afford a Pico scope or some type of good automotive scope before too much longer. I have an Owon 70Mhz 2 channel scope meter that I'm using now, you can get those for a bit under 200 bucks, and I love that thing. It has become one of my goto tools. It has a good enough resolution to check most automotive signals, it even works pretty well for Can-bus signals. Granted it doesn't have all the nice features that a Pico or an ATS unit would have, but it's a good place to start from. Grab yourself a couple of Hantek attenuators and a secondary ignition probe, and some extra test leads, and you can get a good start learning about scope use.

@RATCHETMAN1001 18 күн бұрын

yes any scope is better than no scope

@c.adamscott2312 19 күн бұрын

New tech here. I'd like to see every single application my new scope can be used for. To confirm good part, confirm bad part, diagnose anything else

@alexlongpre4527 19 күн бұрын

Awesome idea for this video series. What I'd like to see: 1- How you properly use the scope to determine cat. converter efficiency 2- How can you determine if a direct injection injector is bad or not. 3- Smart coils... 3, 4 and 5 wire coils. How do you diag. Them? How to get a good primary waveform.

@theroyaltyautoservice 19 күн бұрын

Great ideas! We have a Jeep video coming up in the next couple weeks where you will see the primary waveform on the scope, so that one will be covered soon! 👍

@joshjacob149 18 күн бұрын

A series of simple scope diags building up to crazy scope diags so us learning can have a starting point

@timothycanfora8491 20 күн бұрын

#1 let's gooooo. But seriously great helpful content

@matthewzoelle9149 20 күн бұрын

A lot of shops use tryignostics. Let’s try this part, oh… didn’t fix the problem, well let’s try this next part. I love the scope videos, by the way, looking forward to this series.

@GSRDUDE80 19 күн бұрын

This is unfortunately a common reality in our industry, then I get a call. Hi, I heard it through the grapevine you specialize in vehicle diagnostics and the car comes to me with modules piled in the back seat along with half the interior panels and the engine cover/s. Many times introducing even further issues into the vehicle than the customer initially had. I’m a gluten for punishment.

@antonydunn3742 19 күн бұрын

Hi, I'm new to scoping here in England, using a pico. I have an Audi Q5 2.0 Tdi, the engine check light comes on intermittently and sometimes the glow plug light flashes also. The dtc's show exhaust temp sensor and O2 sensor signal fault. If you could possibly include a test to best find intermittent faults like these it would be very much appreciated. Keep up the great work.

@DEmechanic2000 20 күн бұрын

I’d love to see a scope series like the how to get started and scope basics too high level diag such as timing issues and such

@DependableAutoTruck 20 күн бұрын

great video another segment could be to learn how to properly set up the scopes to read data correctly. thats the biggest problem i have is understanding the settings where the signal looks correct

@theroyaltyautoservice 19 күн бұрын

Great suggestion and we are going to definitely make that happen!

@johnlenoir1023 20 күн бұрын

I like these short videos I am also trying to learn how to use a scope and still do not know all the right settings and everything else as far as filters and probes and this and that

@benb4688 20 күн бұрын

I am an ats scope user now but learned on snap on. What I don't like about my 8 channel ats scope is that some of these crank patterns and can network patterns don't show up with the detail I am used to seeing on a snap on. I can still use the patterns but I'm curious what your opinion is on using the ats on can patterns and some of these high tooth count ckp sensors.

@crasher88 20 күн бұрын

I'd love to see from you, both as an influencer in the automotive repair community and a platform to learn for not just the professional but the DIYer as well, is a database(google drive or what ever you want to use) to supply known goods wave forms for make, model, engine, and component. Yes there are locations where people can get known good wave forms both free and paid but the more data bases available the better. Maybe even add a section of the bad component with an explanation of what is bad witht he wave form

@samvish6363 20 күн бұрын

Single secondary ignition I have a zues and have problems with secondary ignition

@RATCHETMAN1001 19 күн бұрын

if it is truly a sensor it appears to be a negative temperature coefficient sensor , so u could use a surface probe and get a temp reading on the line at the sensor also. that would really let u no if sensor is bad

@scrappy7571 19 күн бұрын

Would like to see you diagnose back up cameras and park assist systems using a scope. Recently had a back up camera not working, tech replaced several parts. It got dumped on me when the tech quit. Aftermarket LED headlights were putting interference on the camera circuit. My little pocket scope picked up the noise right away.

@anthonyhitchings1051 19 күн бұрын

For those intermittent problems, the key feature would be the scop'es ability to take a snapshot of the screen

@RATCHETMAN1001 18 күн бұрын

for intermittent you need a lot of time on the screen for those

@martinarrieta248 20 күн бұрын

Grasias

@provolone1876 20 күн бұрын

I would like to see you guys use the snap on Zeus more I think it would help beginners who can’t afford the expensive ones.

@RATCHETMAN1001 18 күн бұрын

i can assume at 9.05 the ntc sensor is hot so current flows more hence voltage pressure drop and thats when the fan was commanded on. then as fan ran cooling the refrigerant causing the sensor to cool causing it to slowly increase resistance so very low current flow causing voltage to go hi again and the freon wouldn't be cooled instantaneous causing the slow rise in voltage and that is what we are seeing. which i would expect during the yellow showing fan command on cooling. to me the sensor is working. wished pressure gauges were being shown at this time. please put more in the next videos .i no you want to show the scope in action ,but we need all information along with the graph so people can put 2 and 2 together. like in this case where sensor is and what to expect from it on the graph and pressures shown. not trying to stir things up by no means, just trying to help so others can relate to whats happening and what they expect to see on the graph i have been using scopes 25 years and in the beginning you have to understand what ur testing and understand what u should see. its very easy to misinterpret what you see.

@KlassikKarvideo 20 күн бұрын

Carbon buildup on a GDI engine (intake valve), is there a way to use the scope to verify it. Running in cylinder pressure or something else! Thanks for a great video and for starting up Scope training. Lars Sweden

@GSRDUDE80 19 күн бұрын

It is absolutely impossible to diagnose some vehicle faults without a Scope , you would only be able to get so far into many diagnosis’s before guessing and throwing parts at things. They eliminate that guess work, allowing you to be so much more efficient as a motor vehicle tech, giving you the proof you need to ensure you’re making the correct call the first time.

@1MiketheMechanic 19 күн бұрын

I threw up in my mouth a little when I saw that engine bay at the beginning. I am so thankful for modern vehicles.

@petertennant2612 19 күн бұрын

Show us the very,very basics of scope use in voltage drop tests.

@derekbrock8455 19 күн бұрын

For me it’s just about knowing how and what to connect it to…I feel like once I can understand how and where to connect it, I can read the information…

@stevestadnik9206 20 күн бұрын

Chrysler steering angle sensor. Is it voltage or digital?

@RATCHETMAN1001 19 күн бұрын

i wished you would have put the pressure gauges in this pic with the sensor change. would have been more clear of whats going on. not knocking u but its that correlation would have been clear for everyone watching.

@cheapers1952 15 күн бұрын

If it is the 4100 there's also camshaft and distributor gear problems along with intake manifold gasket failure making many a technician perceive it to be faulty head gaskets😂😂😂

@fivefortyeye540i 20 күн бұрын

Thank you 🙏🙏🙏🙏🙏🙏.

@calimesacox 20 күн бұрын

I would do anything for an E Scan

@RATCHETMAN1001 19 күн бұрын

i think what im missing is where is that sensor is located. i can only assume its connected to the hi side ac line, just curious. if so is it reading pressure or temp

@juanfgonzalez2039 20 күн бұрын

🔥🔥🔥🔥👍

@user-ou6xy7by6o 3 күн бұрын

You don’t even need a scanner for that car. You just hold off and warmer on the climate control. after it goes through its sequence you can hit low or high. Low means no high means yes. And you could look at data stream for the body, computer, module and the ECM.

@user-vd4iw6zh7j 19 күн бұрын

Do you face the same issue with multimeters, where the meter shows voltage but the test light won't ?

@petertennant2612 20 күн бұрын

Show us how to use a scope to find out wattage of a test bulb set up..

@sidewayssedan4024 18 күн бұрын

maybe diagnosing gm vvt solenoids

@thatrealba 20 күн бұрын

I want to see it all. I'm not a technician in a shop, I'm an enthusiast and need to get a little more breadth and depth.

@RATCHETMAN1001 18 күн бұрын

super mario has good stuff too

@mikemassegrafixshopmike 20 күн бұрын

We used flight recorders at ford

@johnweiland9389 20 күн бұрын

I lost interest in cars around 1976. The hardest thing for me is schematics. It's gotten much worse. If you gave me a premium autel, I wouldn't know how to use it.

@nicholassanza296 20 күн бұрын

How about injectors, misfires, crank sensor, throttle body.how about showing a new technician how to properly set up a scope on a certain sensor or something and where the leads go and how to actually read it on the graph.

@theroyaltyautoservice 19 күн бұрын

Yes agreed on all of that!