TPS (Throttle Position Sensor) Diagnosis and Understanding Pt2
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- čas přidán 5. 09. 2024
- Part two of two. This section discusses and shows an actual example of how the PCM determines fault codes for the TPS.
Part 1 is here: • TPS (Throttle Position...
Lets hope this 8 year old video stays posted for many more years , first time viewing , so much knowledge , excellent .
I have watched many other channels and this one is the VERY BEST in explaining what the issues are and how to address them...This guy is the VERY BEST !!
Sports Videos Thanks!!!
Very detailed intelligent presentation. I feel like i am in an engineering automotive class watching this video.
Thank you for sharing your valuable knowledge to clueless people like me.
I have "turned wrenches" or parts changed for years...with varying results in terms of diagnosis..this 9 year old video (set) is the first time I've felt like I actually UNDERSTAND when and why and how Fuel injection works. Thank you so so much, very refreshing and less daunting
So glad to hear this!!!
I hung around from part one because being apart of the 2% made me feel like the wealthy corporate Elites. It payed off with more nuggets of knowledge. This positive response goes for both of your vids. Thank you
Just when you think this guy can't get any better... he does. I learnt so much from these two videos. No-one else on CZcams can explain things this way - it's a true gift. "When I do stupid stuff to my car, we all get smarter." Classic - this sums up the learning perfectly.
Hahaha love your comments man!!! Glad you found the channel.
I think what really completes this video is that you intentionally set a fault code using the TPS. Introducing false data is something that ScannerDanner does too and it's what really separates a lecture from a real world application. Learning theory only is pointless until you gain practical experience. You share both theory and practical experience with the viewer. It's more than just education it's experience as well. I think that's the core value to what makes your videos a cut above the rest. I honestly just figured that out and will probably try to include something like that in my videos as well. Please continue to do all of your future D&U videos using this same methodology. It's superb.
Thanks Devon, I was not sure that people would see what I was trying to do there and why. Dude- wait til you see my next video. it will be right up your alley, and it will be epic.
Lol
@@SchrodingersBox 9 years later and super excited to see what you do lol. Appreciate all your help and knowledge
No codes or any problems, I just enjoy soaking in the Knowledge of your videos. Always more to learn. Thanks much!
I am from Indonesia. A very valuable lesson for a very fast change from carburetor cars to EFI systems and to ECU systems that make conventional mechanical headaches. The way you really helped me to know the basic problems in tackling modern cars .. You are my teacher. Thank you
You make me wish I had stayed in school when I was in high school. Frontier Public Schools (16 at the time) had a program that sent some of us to Stillwater, OK and the course I chose was automotive. Don't know if I would've ended up being a mechanic but I do know now that it would've definitely been worth it. Appreciate helping me understand more of what's going on under my hood and with my problem!!!
This channel is unlike any other automotive channel I've been to. I've learned more from just a few videos than I would ever learn on my own. Thanks Matt.
My pleasure! Differentiation is my specialty!! Wait, was that redundant?
Used this 2 part series on TPS diagnosis on my '94 Suburban using a DVOM. Tests confirmed I had a bad TPS, as voltage would drop out to zero every time I would pass 4 volts. Installed new TPS, and stalling problem solved. Excellent videos, excellent channel. THANK YOU.
Thank you- We resolved this issue as a result of your excellent instruction!
In our case Throttle position was "noisy" as compared to Pedal Sensor. Hence the fault code. Based on your info- we determined that the problem was simply a dirty Throttle Body. The valve was struggling to muscle past the 30% mark which threw an error code- due to the fact that it was loaded up with carbon and other gunk. Removed, cleaned and re-installed the Throttle body and the car runs like a champ- no fault codes
Thank you for your commitment to instructing us- We love your binary frankness. It works for us analytical types !
Awesome - I actually had this EXACT situation myself earlier this week. Very erratic TPS signal on a drive-by-wire system caused by carbon obstruction. Cleaning the TB fixed the problem. Seemed at first for sure it would have been a whole TB replacement but ended up being (another) free repair!
great information for any entry level tech or even experienced technician as we sometimes over think things and forget about the basics like our reference sources with MAP , IAt and MAF Cant thank you enough for taking me back to school.
Much respect.
+TheRebuilt1 Thanks man that's a really nice comment.
I love your teaching styles and appreciate everything you do on CZcams. Thank you for taking the time to teach those of us who live in CZcams Land how to diagnose any unit in our car that may potentially be faulty.
No more swaptron for me!
Hi, just to let you know that I’m really enjoying your videos, you are very straight and to the point and I can see that you don’t suffer fools gladly.
I think that your approach to teaching really makes people put their brains into gear and start learning about diagnostics in the correct way.
This is a fantastic channel for people who are serious about vehicle diagnostics.
Thank you for everything that I am about to learn, Chris, U.K. 👍
I can't believe all his videos are free for everyone! I love it.
Thanks man but my best videos arent free actually. www.schrodingersboxqm.com only $3.49 per month
@@SchrodingersBox That makes sense and reasonable. Massive amounts of info for the price of a coffee
Great explanation and demonstration!
I had one of the first EFI 5.0 mustangs when they were first introduced. At around 150k (I got 330k outta that car), it developed a miss that drove me nuts. Well..., off to, I think auto barn at the time in the early 90's to buy a scanner, which at that time with OBD1 only emitted audible tones that you had to reference with the provided book. Well, it pointed to the TPS, and the bell rang for me when I realized it was a mechanically controlled POT and my engine was behaving like the staticky volume control on my home stereo! I swapped it out and that solved the intermittent miss.
Your videos are really clicking and I'm getting a better understanding of the map sensor and how it works similarly with the principles of a CV carb. If I'm correct, the map supports the signal from the TPS and confirms fuel delivery and mixture based on manifold pressure.
Thanks for the effort you invest into your videos!
I'm not auto-mechanic but i have a lot problems with this type of issue with my car, and you guess, i not get any reasonable answer from anybody, so, i can certainly conclude you are give to me the best answer for problems with my car and thank you very much.
I don't give answers, I give information that is needed to get correct answers.
Same thing, but from an philosophical point of view. In any case, thank's. P.S. This cat is an Shrodinger cat, and i'm pretty shore You tend to an philosophical way of thinking. Because Quantum Mechanic have a not in common anything of classical mechanic. But hey, i'm just want to thank. Greeting
It's really nice that folks like you take the time to show us these things. Thank you so much!
The automotive scientist! Love learning n enjoy ur videos. My dream would b for u to do videos w my 01 mustang get. I have many issues, but it was my uncles car n he passed away from cancer n it's all I have left oh him except for memories. Everyone try's to convince me to get rid of her but I won't. She still has a lot of life left in her. Great engine, great tranny n solid coolant system. Bearings r wearing out, lower steering bushings, throttle issues, pulls is creaking, driver side window dnt open, a/c needs freon. Watching ur videos helped my do brakes, change tie rods, I put in a new water pump n belt. I appreciate what ur doin brother. Keep teaching my guru. -Big C
Thanks man!!
@@SchrodingersBox my i20 1.2 petrol tps signal wire has .30 volt and other wire is 5 volt. However, my idle rpm is very2 low 600 rpm as against the normal 850 rpm.
Will adjusting to .45 volt brings the rpm to 850??
Matt, I just recently had an issue with my 2001 Chevrolet S-10 4.3L throwing a P0122/P1122 codes. The idle had been erratic once in a blue moon, but no codes were ever set. Late last week though, it finally set these codes I mentioned above. I checked the 5V/ground reference/and signal wires, and they were fine (used both a DMM, and scan tool software). I finally got around to replacing the TPS on it today (pain in the ass on my truck by the way), and have been driving it for a while, and the codes haven't returned. I bench tested the old TPS with my DMM, and indeed there were dropouts in the wiper arm of the pot as I moved it back and forth from its springloaded position. It was the OE one for my truck, and it lasted over 160k, so I really can't complain about that. Great videos as always man!! Hope you keep it up!!!! :)
Dude, you are the man!!! I love how u explain a tps as a potentiometer and continue to explain what a potentiometer is. Big fan of the channel.
This guy is GREAT!!! Not only funny at times, but has a real talent at getting his information across. Though I'm not very "mechanically inclined," I have started to watch Matt's videos because "HE EXPLAINS & SHOWS HOW THINGS FUNCTION!!!" Many people have said that I get to 'Anal' about things and ask to many questions of how things work. Well, I feel much more confident about trying something new if I have information before hand. "Like Matt's videos and explanations." I will continue to watch his videos and have shared his name and videos with many of my friends who try to understand functions of vehicles before they just go and replace a part. Thank You Matt! I still don't know a whole lot yet, but I know much more than I did from just a few months ago when I first started watching your videos and I always "Dig" knowing how things work and operate before starting a task, if possible. You're the Sh_t Man!!!
Thanks for the comment!!
Wonderful information! No wonder codes can be wrong as you have just proven! I have a 95 Astro van that has turned evil! And I suspected the TPS because of it's job. My van stutters, stalls or won't start at all but starting fluid is always the miracle cure! Of course, my spark plugs suffered greatly. Even my mechanic who is ASAE certified is stumped. He said fuel pressure was good and my injector pulse was good and the MAF good. Because of the confused readings of the ECM, he suspects it. You have helped me understand a lot about sensors and how their changes in variance affect the brain! Thank you so much! I have a good amount of knowledge about cars and you've answered another point as to why so many sensors report almost the same condition? Now that I know how one sensor validates another, I have many things to ask my mechanic! I did know about the voltage resistance but you've give me so much more! Love your humor about these issues. Sometimes you've just got to laugh at things about life!
it takes great understanding and experience for such Mark, you really did a good detailed job here. Am overly impressed, thanks so much.
THANK YOU! I'M OLD GEAR HEAD WHO MISSED THE COMPUTER AGE IN SCHOOL, U OF CZcams IS MY NEW ALMA MATER! THE COMPUTER INFO IS IN A GOOD MANUAL, BUT NOT THE THEORY OF OPERATION.
I'M PROUD TO SAY I'VE SCREWED-UP A COUPLE OF GOOD CARS BY SHORTING OUT THE COMPUTER TRYING TO FIGURE OUT THE GODDAM TPS!
AND I DO OWN AN O-SCOPE, GOT IT FOR TEN BUCKS AT A YARD SALE...
Very Helpful Matt. I am working on a 92 Pontiac Trans Sport and after a full night in the ER last night from Carbon Monoxide poisoning of 20%, I am back in service.. That will teach me to not vent the exhaust out the door lol... Anyways, I have a hesitation in the engine at idle like a surge, and initially ruled out the TPS as the culprit, but after watching your videos, I have learned that other possibilities may be in tact here. I will be running tests that you had mentioned... Very Helpful and thanks again!
+stan miller Yes I'd start with a fuel trim analysis and see if you can identify lean or rich at the particular strategic learned cell at the point of hesitation. That should give a solid direction.
+Schrodingers Box
thanks, I'll watch your fuel trim video after I find it.
You are a perfect personality, Matt! Feels like I'm back in school with a class I enjoy complete with jokes to check if viewers are listening. I feel a slight drop in power b/w 3500-4000 rpm in my 1990 Miata if I go slow enough and let the revs build up. Rising through those rpms, I feel a small jerk and the car pulls forward (once the power comes "back"). These videos gave me confidence in a subject I'm only starting out in. I'll check back if I can figure it out (after cleaning the throttle body first, of course)!
I'm brand new to working on cars but I've been fixing electronics for over a decade.
I'm happy to learn how many things the two have in common, actually (part of me is inclined to sarcastically comment to myself "it's as if a car is just a big MACHINE" lol).
I found this series VERY informative to a person like me. I just bought a somewhat lemony Suzuki Verona from a title pawn place and have been doing everything I can to fix it up. I went to Advance earlier today and got a reading that I have a fault with the TPS and the O2 sensors (though it didn't tell me which O2 sensor), and was very happy to find out how to start probing my TPS in this regard.
Thank you for creating this channel, and especially this series of videos, and I'm looking forward to everything else I will learn here!
As old as this vid is, your teaching is relevant and appreciated. Thank you for posting.
Although I have already learned this stuff, a refresher once in a while is a good thing.
I gotta quit reading all the comments conversations or I'll get stuck and have to understand all of it. So many questions.... I don't need to know, yet.
keep it up Matt
Finally problem solved when I set up a test rig for the TB the butterfly opened put the TB on the engine connected plug and again no buttery comment when I pressed the accelerator pedal buzzes out all the wiring from TB to PCM and one side of the coil open circuit ran temp wire TB opened when pressing the pedal cleared codes all gone hopefully never to return
Many thanks for your help your presentations are the best
Thanks
Tony
Great information Matt. Thank you for taking the time to explain in terms anyone could understand. Well most anyone. Very helpful.
+John Tyra Thanks for appreciating it!
Hey Mat!! You are one hell of an expert in modern cars!!! The Best!!!
Thank you for bringing technology and your style technical analysis back to automotive repair. Obviously, mechanics need to be electronic technicians. As an old school shade tree mechanic and an electronic tech for for thirty seven years, it is refreshing to review automotive troubleshooting that would be scary to some.
Pumkin Head Thanks bro. I agree 100%- it is essential that people who want to repair modern cars break out of the mindset where a wrench and socket set are the first tools that come to mind!
PAY CLOSE ATTENTION!
Brilliant work, brilliantly explained :-)
i just watched an hour of your egr vids to finally get back to part 2 of what i was originally interested in in the first place. Keep these vids coming man!!! Youre awesome!!!!
Bobby Fletcher ?? I don't get it?/ pass that shit over here.
virtual joint passed
I nevever had inhaled relations with the preverbal Joint
great information, I watch all vids you have and take notes and I now have a lot of knowledge on how to fix my own vehicles and diagnosing problems instead of dumping money in it when it's not necessary. kept it up brother good work!
The best teacher that i ever saw
Excellent video! My TPS (a cheap replacement from the past year) is reading weird voltages. Idle can be 0... or approx 0.5V.... and sometimes is quite abit higher and the engine idles above 2000rpm! Also, I understand that the connector sometimes goes bad and should be considered. I believe this faulty TPS is creating other trouble codes... randomly...
I just can’t get enough,the rest is just the beginning of all to come. I know that you know that they know,you’re the best. Thank you much and keep Them coming. 👏🚘👀🥰💯🇺🇸 22:36
Glad to hear. I always love seeing new binge-watchers haha!!!
man I love they way you explain how parts work and how they are related to each other
keep up the great teaching you do great job thank you
gonz garr Don't worry- we don't change things much on this channel anyway lol
Thanks for your reply sir.My tps checked out good so I cleaned my throttle body and that seems to have fixed my problem.Who says you can't teach an old dog (67). Thank you!You saved me about $35.
again thanks fellow being on how you present awareness and insight with us out loud
Another FANTASTIC, enlightening video. The hits just keep on comin'. THANK YOU.
Thank you for your informative videos and the understanding of sensors and systems. Thanks again
You explain things well.... And you crack me up with some comments/statements in your video....
Many thanks from the UK very helpful with considering the issues that I have with my 1998 Range Rover P38. No doubt more questions to answer!
Damn, I feel smart. And after watching these videos I am even smarter. Now I'm a junkie. I need more!
Thanks for the 2 videos on TPS. Just have to go back through your older ones to catch up. Subscribed now. Once again many thanks. Steve.
Wow. It all makes sense now. This video meant a lot to me. Thanks for making it. 😊
Glad it was helpful!
Thanks Matt! Working on a 95 Yukon 350 and you have really been a great help
Having an oscilloscope and knowing how to use it will make you an electrical diagnostic wizard.
so true!!! many people think you need to be an electrical wizard to use an oscilloscope. i found using an oscilloscope is what made my an electrical wizard though.
Great in depth drill down into this subject of TPS. took my 94 lexus LS400 to dealer. To no avail not fixed they seemed dumbfounded after just doing the factory adjustment settings of the TPS same issue code after $143.00 hr Lexus customer abuse program.
Thanks this helped me by giving me another direction to look. I have a vein style air meter though. I've unplugged the TPS on my daily to prevent surging in the meantime.
Yeah I hate vane styles. Most often the issue with those is a mechanical impedance.
greetings Matt, ol'fart here and i been watching your videos because i need to catch up on these new systems. I prefer noncomputered cars myself (i think i just invented a new reference you be the judge). Thank you I've learned quite a bit from you keep up the good work.
P.S diggin the ride!
+mario zermeno Yeah everyone prefers non computerized because they are so much easier. But once you challenge to yourself to step up to modern technology, you will also actually be better with older cars too because they seem even more simple. It is a very good idea to catch up on these new systems as you are doing. We are 100% certain to continue in this path, and the ability to change points on a distributer will be completely obsolete and those who stay in the past will be passed.
Don't pass my Model "A" that my parents used on their wedding.
Great show!
Hey Doctor! I call you Dr. Because I believe you are one for cars. And I am the 2%
Here is my problem. 2003 make Suzuki Grand Vitara 3 dr. 2.0L 4cylinder engine with automatic transmission.
Fuel consumption is like a 6.0 liter 8 cylinders- performance is like a air cooled 1967 VW Beetle.
NO Check Engine lights (However I had the P0135 and P0141if I am not wrong for the heating circuit failure for both O2 sensors which have been replaced a couple of days ago and which are the actual reasons to put me in the 2% as you call it)
I figured out that my car falls in OL Drive while I am driving normally.
All measurements on the scanner somehow make sense to me (after what I have learned from your channel).
For instance at idle STFT1 around 0,8...1,6% and LTFT1 is low accordingly. It's like heaven until I move the car.
1-When I push the throttle (not floor it, only push it a little hard) I see that it changes into OL Drive, thus (correct me if I am wrong) the fuel system says "balls to your sensors, I will do as I wish". That ends up in a gagging engine with No Go situation.
I am suspicious about the TPS, because it shows 13,3% even at idle (is that normal?) and I can never reach 100% even when I floor the pedal. I believe or at least think that there should be a way to "teach" the ECU which ohm corresponds to zero and which ohm corresponds to 100% on the TPS potentiometer. (Because my TPS is fixed only by 2 screws and there isn't a way to "adjust its position to zero" prior to fixation.
2-I have also noticed that (apart from the example above) it goes into OL mode again when I leave the car into a "free roll" down a hill. No throttle but only gravity pulling the car down the hill.
Please tell me, under which conditions does the engine go into OL?
Certainly Cold engine is one and I think a throttle position over a certain limit should be another one since I believe the engine thinks "the guy wants to accelerate quickly"
where/what else should I check??
Sorry for my poor English and thanks in advance for your support.
Murat
Hi Matt,
So glad I took the time to watch, thanks for keeping it simple and clear with examples.
I may not fully understand the communication of men about their peters, but I'm glad you don't have two or I'd be tempted to trust someone else to likely approach this wrong. And once again I'd have to figure it out, fix it and what ever else they messed up anyway.
I love to learn, tho don't really want to focus here now, I know I'm the better for it.
I don't like techno like I used to as it is being used against us in all the worst ways. But need to stay on top to counter techno intel ya know.
Thanks again
mak
Thank YOU!! You have spent a lot of your precious time enlightening people like myself & I appreciate it sincerely!!! You should be or maybe are.... a teacher.
Hello. Great videos. I have to admit, I was tempted to be a part of the 98 %. I thought you were quite cocky and arrogant. But, now being one of the 2 %. I get it. Thanks.
Thanks!! Yes it’s not until you “get it” that it all comes together. trust me- the cocky arrogant ones are the 98%’s. you have to be incredibly arrogant to spend hundreds or even thousands of dollars guessing at a problem and believing you are more skilled than someone like me.
This is great help. I have a rough idle condition and my acceleration is not smooth but I have no engine light or codes. I have a direction now, thank you.
+wyattoneable You have a definite direction indeed. You will find that the TPS is not your problem which will be helpful in your differential process of elimination.
Very good instructor, one suggestion, get some jumper wires, say from an old connector so you won't have such a hard time checking for power with your probes,remove wires from connector and install on pins,I'me not criticizing just a suggestion. Again thx for great tutorial!
Excellent. I actually had a TPS code and turned out to be a sticky MAP sensor. Wish i did watch this earlier it would save me alot of head scratching :P Thanks
Thank you so much Sir, it broadens our knowledge enough from your clever presentation
I love your lessons, I don't have a Rice Burner but I do have a Sauerkraut Burner. It's a 2002 VW Beetle 1.9 TDI diesel. My problems started when I went to move it and it wouldn't come out of park but after pushing down real hard on the shifter it came out and went through every gear but wouldn't crank, nothing happened when I turned the key. Code was for Natural safty switch, I changed it, now it will start and drive but still indicates it's in every gear and it's in that Damn limp mode the new codes are......
P0228 Throttle/ Pedal sensor position sensor C- circuit high input.
P0705 Transmission range sensor A-circuit low input
I'm not a mechanic so I'm asking for any advice.
Thanks Harold
What data do you have?
Thanks for that nice explanation of how things are going in the car...
I think that I am getting smarter about this stuff, Definitely less intimidated. good tutorial, as usual.
I wonder what a wrong O2 sensor, and the wrong size tires would do.
Thanks for the lesson on sensors. Definitely learned something.
This explains why I had a TPS that went bad, the car kept giving a code for bad MAF sensor. I was perplexed because the MAF data looked perfect on the scan tool.
EXACTLY!! I call these “references codes”. The PCM can’t correct determine the particular sensor responsible so it references the wrong one. Happens all the time. Cam and Crank sensor codes also are very often referenced codes.
please, please, PLEASE continue to make videos!!! super informative!! equivalent to GOLD even!! and i completely agree with some of the commenters on here: please invest in a scope!
Lol, can't ignore a comment like this one Killer. Consider it done- both as far as making more videos and for the scope
I am glad I stuck around, thanks for laying it down for us!
I am definitely learning, and I have to admit that a lot of your videos go right over my head. This one though, really helped me understand because I did have that question about why we need three different sensors all telling us about oxygen and how that influences the stoichiometry. Back under the hood tomorrow to get Bessie to stop stumbling. The problem that I have is that the TPS has two switches. The top one is to tell whether the throttle is open or closed. I have to wonder if I have an issue with the throttle stop screw being changed from factory settings because the TPS passes its tests when it is off the vehicle. When I mount the TPS and key it to the throttle, it will not pass its tests. This also has had me suspecting the accelerator cable is not in its proper setting. My issue is I have vandals we're constantly trying to keep me from being able to work.
It’s possible. I usually set the idle screw to 3% TPS position at idle
@@SchrodingersBox thanks
the best video on this subject...
I have an oscilloscope I bought it to better understand electronics and to be honest I also wanted to learn all about using a scope. It was a good idea, my electronics knowledge improved along with being able to observe and verify it all. You can buy a reasonable one for about $400.. (Rigol, Siglent, for example)
Great to hear! Yes it’s easily one of the best investments you can make to reach higher levels of diagnostic ability.
I enjoyed the info, and is very helpful.
Hi Matt
What great videos these are, thanks for posting.
I've always had to fix my own car in the past but now with these computer ones I need lessons like yours.
I'm 61 now but as they say, never stop learning. I went to college for three years learning Electonics so I can understand the comparator circuit principle.
Where do you come from as when you pronounce potentionmeter you say it different than us in England. Like po-ten-she-ometer, interesting.
I've got a Nissan Almera 1500cc year1 999 I've had it 10 months now and it's always had hesitation 62mph in 5th gear and in other gears also does the same.
I opened the electric window once and the car didn't start for three days, it did crank over though, then ok.
I went to come home the other evening and it wouldn't start, like it didn't have any fuel, it started for a little bit and then died. I put some petrol in and after a
few cranks it started. It got me home but I then went to go out later and just cranking. Next day it started. But I had to walk home as the battery went flat
trying to start it. I charged it and then it started. So you see I really need to learn this stuff. PS. I've got an anologue needle meter which is another option than the digital meter, what do you think. Thanks again and any info would be great. PS I found the problem, it was an intermittant fault on the fuel relay. Singem.
thank you for sharing your knowledge.
Very interesting explanations...really learn a lot. I'm in the 2% who loves learning about the technical features. This episode (1&2)) helps me understand the interrelations between 3 critic components regarding air and fuel. Thanks for taking the time. Note: To minimize or maybe prevent shorting the PCM would it not be safer to separately back-stab the the three wires feeding the TPS rather than touching the terminal ends? (Of course one must still be aware of supplying positive or negative hook-ups.) Again your presentations are powerful.
Yes these methods are essential and we do have to prioritize with any checking that is possible as we change all... and that's all of the parts.. that we can access.. it's good to have somehow a procedural precautionary list of priority things to change ..with anything but a new vehicle..... frugality and complacency can and must not apply..... Lives have been lost on the freeway as people stall out unpredictably.. persistent part changing... even transcends imechanics precision and possibly presumptuous or complacent accuracy
Well to each his own but I am not changing parts that are proven to be functional.
If a tuneup makes you feel better- maybe it's worth it. But it won't make the car feel better if there's nothing wrong. I see no point wasting money for no logical reason or through lack of compehension on how to properly evaluate.
Matt you definitely need a second penus. The dmm will and does work but a scope is wow - you will think you've been living under a rock. I bought the Pico 2 years ago because the dmm was not fast enough. I had a chev g van with a transmission late second gear shift with no cel. I did the sweep check with the dmm and it was ok , at this point I took out the Pico and surprisingly with a rapid sweep of the throttle indeed I could see the dropout. Is the scope required no. Drive by wire testing for a tps is quite different . I have found out the hard way you need as much technology as possible to find a fault asap. I was amassed at first with the Pico how my dmm and autoenginuty scan data were either too slow or took an average reading. Fantastic series looking forward to more. Thanks.
You know, one of the reasons I brought up the oscilloscope was to probe on how many subs have one. Turns out it's quite a few. I will consider it more now than I did before!
I also got a pico 4 channel like scanner danner . cheap scopes can not zoom in on problems like injector pintel humps closing differnt times ..... but i do think a scope is a must have pico have a new one come out now also in case this is important to someone. a cheap scope is affordable for anyone who fixes cars maybe not a pico but there is plenty other pc based scopes and cheap handheld like the valeman 150
Intrade motor - could not agree more, seems a lot of us following SD do have a Pico scope. Seine waves , square waves ,pressure transducers ect. I found the learning curve with Pico quite easy compared to a manual scope with no pre set test features. SD has convinced me the benefits to the snap on solus pro - puts my autoenginuty to shame , maybe Santa will come thru LOL. 😄
Steve Rob A lot of people have mentioned the Snap On Vantage in the comments- think that would suffice?
Not if you want the Best you need a pico 4000 or buy the new one come out, or the ats GMTO these are the top 2 for automotive
GM uses the picoscope as must have for 2014 vehicle diagnostic and branded a pico with GM logo as there oem test equipment .
With pico you have the advantage that danner uses it and lots of other professionals who supply youtube information like autoinform or tstseminars. The pico software is free to use in demo mode for anyone to mess with.only waveform libary is only functional once you connect the actuarl unit. the software stays the same in demo and with scope attached on pico.
www.picoauto.com/software-picoscope-automotive.html
Just started this video.. hopefully I can start listening also.. I can of course go back to part 1 and will period. to watch 10 times to get warmed up
Very well explained. Thank you.
Great video! I have learned so much watching your videos. Keep up the good work.
+Jose Cabreja Will do!
LOL...19:27...20:53......humorous...quick-witted....charismatic....powerfully smart....articulate....this man is a 2019 Corvette Stingray incarnate...or a descendant of Master Yoda!
Wow thanks!!
I think you may have forgotten about the IAC valve opening up. This is why your RPM increased. It wasn't just more fuel. It was more air and fuel unless I missed something.
BTW you're doing an awesome job my friend. I'm feeling threatened :)
ScannerDanner Premium Hahaha no I am threatened, you are probably right HOWEVER- it still makes the point that the PCM knew to credit the error to the TPS and not the IAC, MAP or anything else.
Agree bro but I have seen discrepancies. Like a glitching TPS cause a false MAF code on a Kia or Hyundai (can't remember). Or a dirty throttle body on an electronic throttle control system set a false MAF code when the problem was too high of a throttle angle. Poor software coding or engineering is what I would say the issues are there. So I would agree with you again Matt with this video but...sigh I work on 40 different car lines and there is no standard. :)
Sorry the dirty throttle body was a false MAP code. I actually have a video on that one. It was on a trailblazer. I think the code was a 1405
ScannerDanner Premium Really??? OK that changes everything. I will look into that. I haven't seen that video of yours.
Why are you watching this video instead of my groundbreaking O2 sensor experiment???
I was bro, then I watched some more :)
Nice job on the tomato sensor!
Here is the link to the false MAP code video I did
m.czcams.com/video/4C075DS2Ud4/video.html
Lol yeah I kinda didn’t think that was my problem but he’s supposed to be a mechanic so I figured I’d listen. I still can’t seem to figure out my problem tho. I always have to put fuel in the throttle to start it. Fuel pressure is at 40psi until I start it with gas in the throttle. The fuel pump and filter were replaced a year ago. So I’m trying to see if it’s something more simple before dropping my tank again. It’s a 1997 Chevy blazer 2dr 4x4. 4.3 V6 vortec. And I lose power when accelerating and stalls sometimes at stops. I’ve cleaned the throttle body the egr, replaced pressure sensor, found I didn’t have a thermostat that is now in, I’ve checked the vacuum hoses. Cleaned the pcv valve, the iac, Put in catalytic cleaner and fuel injector cleaner. My dad was convinced it was the ignition control module which he replaced but I didn’t think that was it and it wasn’t. I think my next step is fuel pressure regulator and distributor cap. My oil gauges is really high when I first start it but after driving awhile it goes down really low. And it’s impossible for me to go uphill. And it stalls more often when the engine warms up. Although I’ve watched a lot of your videos and have learned a lot I can’t seem to pinpoint it cuz the symptoms I’m having seems like it could be anything. Even something as simple as a bad ground.
I have a fluke 87 v for meter. multiple flukes actually... Innova 3130 for a scanner> It works.... but I don't have a scope. Would be cool to some videos of that though. Great videos Matt
Hi Matt, I have 2004 Volvo V40 with engine light on and pending P0102 code which referred to MAF . I swapped the working MAF. from my friend car, but I got the same code . Finally I cleaned my Throttle Body, Idle Control Valve and I got no check engine and no fault or pending code at all. Cars controlled by computer are means to rip us off bcz. in North America if your car showed pending/fault code, it will never pass the Emission test although your car is running well.
It is not meant to rip you off- it is exactly the opposite- it is meant to HELP YOU FROM GETTING RIPPED OFF. Had you diagnosed the car properly you would have known the problem without changing the MAF because the MAF could not possibly have been the issue.
Wow! Great stuff!
And your eccentricity! lol
Just great.
I have been working on a 2.2 ecotec in a 95 cavalier and the thing is dying during high torque loads, seems like during automatic gear shift changes. Idling low too. I can pop it into neutral and start it if I give it a lot of gas, usually, even while coasting.
I will drive it to o'rileys and use their computer to see if it throwing codes, but I might use my ohmmeter to have a look at a few of the components, now that I have an idea.
Thanks!
Awesome work Matt, keep it up. Like how you also test it with a DVOM when possible. The PCM is saying, Whatcha talkin bout Willis?, That was funny!
Yes I agree the DVOM is not only useful for people who don't own a scantool, but I found that it also adds to the learning of the function as well since people "see" it better with a DVOM.
Thanks! Best spent time today.
I love my old analog Techtronix 2225 scope. You can get used analog scopes so cheap now. Still trying to save up for a Rigol DS1054Z, few more months!
Just waiting for next.Its totally cool.Thank you.
Very interesting. I suppose, that to your second point regarding 'why all these sensors', i.e. that the responsiveness of the engine is improved, that the inclusion of an APPS in a drive by wire system [like on my 2006 Camry] would enhance that responsiveness even more. The PCM wouldn't have to wait as long to know the throttle plate was being moved by a physical linkage...it would know immediately from the APPS. Thinking further, it would actually be the computer moving the throttle so it would know, almost ahead of time really, what was going to happen and could set the fuel flow accordingly and then get feedback from the other sensors and correct as needed.
Nice. This is the Khan Academy for cars. Great stuff! Thanks!
Wow, very detailed video. Thank you very much for your time and knowledge. 🙏
I love to look and learn from your videos.It´s nice to go to the mecanic Already nowing whats the problem so he dont just put new items in but make the rigth dianostic - Sorry my English- I am danish :) Thank´s Mat
Gotta give it up for his attitude :)
And thanks for that lesson .