Cranking No-Start Real Time Diagnosis -Ford Focus

Your favorite DIY home mechanic diagnosing a No Crank No Start on a 2002 Ford Focus.
Links relevant to this video:
No Crank Diagnosis using my "FASTTEC" method
• No Start Diagnosis FAS...
How to test Relays and manually energize relayed circuits:
• Relays- Understanding,...
Fuel Pressure Diagnostics:
• Fuel Pressure Regulato...

[@seanwodicka2036]

i have been diagnosing engines exactly the same way you do since i was 14 , on top off it i sent myself to college and added a machining degree . I am impressed ,good job!!

[@miguelbolado1280]

I love how straight to the point this guy is ! LOVE IT ! No BS, no silly sally dilly dally bs jokes or run around ! Love it !!! This is professionalism at its finest !

[@paulturner6498]

Migizzl Empires what does fuel at the rail mean?

[@prof.kalipi207]

Great stuffs

[@dragonmantuning3792]

@@paulturner6498 fuel inside of fuel rail

[@FordTechMakuloco]

You are very thorough you don't jerk around and you diagnosed it right the first time. It is literally a process of elimination fuel, spark or air which is it.

[@OscrSg]

this guys channel and yours are some of the best on youtube, been subbed to you both for over a year

[@pramponi]

You just proved that what my auto shop instructor said was true. "A no start should be the easiest problem to diagnose.", and the hardest, in his opinion ... driveability. Greatly enjoy your videos. The step by step logical path is extremely helpful.

[@SchrodingersBox]

+pramponi I agree with your instructor very much!!

[@1truthseeking8]

@@SchrodingersBox How about a no electricity problem? any tips? Started as an "intermittent" clicking sound (?possibly coming from a relay/solenoid under dash near fuse box?) and electrical power off/on...(only had it for a few weeks) NOW ... that has just become a "constant" no power at all, ever. (open the door: no dome... Turn lights or hazards, nothing... Turn key nothing ..no power at all... (Except a faint red glow on the little red led near the hazard flasher button, but when keyboard turned goes out) ...and no more clicking either... all grounds tested good, (put jumpercables to bridge anywhere there might have been a weak ground too just to see) new battery, all charged up & good voltage ...but nothing... (automatic transmission)

[@SchrodingersBox]

I would start at the fuse for the circuit and if there is no power at fuse simply trace backwards from there. If there is power at the fuse trace forwards. It’s actually way easier if there is consistently no power. Is much trickier when it’s intermittent.

[@Bob-bg4dp]

Had the same problem as this video...and with the same results. VERY well done and informative. Even though I had gone thru most of the checks I still learned quite a bit. thank you.

[@REDNECKHOOSIER1]

You got me good this time. My wife & I were watching together and as soon as you said 03 Focus no start I looked at my wife and I said fuel pump relay because about 4 years ago we had an 03 focus have the same problem and I diagnosed it back to a fuel pumthe car ran good for a little while but then wound up having a major electrical problem that caused me to have to have the engine completely rewired so I took it to a shop a couple days later it caught fire driving down the interstate that's when I decided to open my shop so things would get fixed properly

[@alixwhite4054]

My 07 Ford Focus is going in the shop tomorrow and I hope I have a superb procedure, all steps to check guy, like you are! Mine is intermittent starting.

[@SteveRobReviews]

Like the intro. My number 1 observation for fuel pump failures on identical vehicles is constantly running the vehicle with low fuel level. I only like factory fuel pumps or carter. The rest of the aftermarket pumps are hit and miss. 👍

[@SchrodingersBox]

Steve Rob That's exactly why I am waiting 5 days for the new pump--- it is in lieu of getting an airtex in 2 days, and then repeating this job next year lol

[@BigMac2222]

Schrodingers Box Sad, airtex used to make great pumps.

[@NoName-tz5ji]

Derrick Hodges I always had good experiences with airtex,but I haven’t bought one in a decade. I wonder how Bosch is nowadays.

[@SchrodingersBox]

You gotta love the armchair mechanics who subscribe to this channel for the express purpose of thumbs-downing the videos as soon as they are released, and yet they still watch the entire video and learn about stuff that they have never done or will do. Just sayin....

[@DJDevon3]

Schrodingers Box I know 1 person that would certainly do that for every one of your videos, not gonna name any names. :P

[@SchrodingersBox]

***** Hahahaha.... He's not a sub though!

[@DJDevon3]

Schrodingers Box He's on mine. I don't continually call him out though. ;)

[@DJDevon3]

***** It's no one subscribed to this channel that's all anyone needs to know.

[@GRowe1978]

Schrodingers Box Why would anyone thumbs down any of your videos? They're all informative, interesting and accurate. It must be someone who manufactures plugs, wires, and coils for a living and they're afraid you're going to cut in to their profits. LOL!!

[@LCM2248]

I find your videos really interesting. I majored in auto mechanics some 20 years ago in high school. I chose to pursue other career interests, but long before that and to this day I still love working on vehicles, and your videos are a different slant on things, and after all these years I am embracing the "high tech" ways of diagnostics and figuring all this new age out. These videos help a lot. Keep up the good work and good luck.

[@MohammedIBRAHIM-iw1xl]

Thanks sir. I followed your progress and found out that the wiring inside the sending unit was open after I was convinced that the pump was bad. So the best thing is put all possibilities up front . Thanks again!

[@labradormcgraw]

Fantastic video. It covers all eventualities, right up to the diagnosis. Best channel on KZbin for learning about how it's really done.

[@sinegra30]

Thank you for the tutorial! That car has a Fuel Pump Module, is a returnless system so the Fuel pump module controls the fuel pump with a PWM signal, that relay you are energizing will not turn the fuel pump on it will only send 12v to the module

[@integritymotorcar2334]

Hello and nice work. For safety reasons, I feel that it is important to mention that caution should be used when applying power and ground to a circuit where there may be a likeliness of fuel vapor because of the arcing that takes place when electrical connections are made and broken. I noticed this when you used the Power Probe at the tank. It even appeared there may have been an evap. line or something that was disconnected in that shot. You also mentioned the tank was empty which would make this even more dangerous given the amount of vapor. In a situation like this where making electrical connections is a must, it may be safer to extend jumper wires a safe distance away from the presence of fuel and then making those connections there in order to gain your desired result. Please forgive me if this has been mentioned as I have not read most of the comments posted here, nor am I very familiar with YT usage in general. I am a subscriber to your channel, yet have not had the time to view many videos, but have enjoyed the few that I have seen. Your logic and perspective is a treat to see and I really appreciate how you provide the auto repair consumer with the same. It makes for better communication and understanding when they are in need for professional and courteous automotive maintenance and repair services.

[@james697218]

i think this guys video is just as important as all the mechanic video,s i watch. so please dont thumbs down mechanics, we are just as important to you as dr,s are to you, everyone sees a dr, and everyone sees a mechanic from time to time so be nice, if you dont think its right or you dont like this guys video you dont have to watch ,,

[@engelbertmaier2853]

As usual a very good explanation how to make quick diagnose of a no start. And for a German like me your english language pronunciation is proper and clearly understandable. I watch all your vids and have already learned a lot. Thank you very much.

[@SchrodingersBox]

Thank you very much! I do get a lot of compliments from foreigners on my english!

[@robertstevens1507]

just WANTED TO SAY THANKS FOR THIS VIDEO . i was able to get my girls car home last night after watching your video.

[@joseburgos5106]

Great video. Thanks for your time and effort sharing your knowledge. You got what it takes to be a good teacher on this matter. Super, this will help me get my 1999 Suburban up and running again. Stopped working while it was parked with no so much use. A couple of more test but more than likely it is the pump. Although I can hear the noise when it energizes. I changed the Cam and Crankshaft sensors alerady... We'll see. Thanks.

[@t2p]

Had this before on a focus. ....dodgy connector on the fuel pump...they even changed the pump but neglected the broken connector which would works loose in a couple days... Nice channel and diagnostic routine...subbed.

[@sirchristopher7684]

Dude, you are an absolute badass at diagnostics and you make it understandable as well.

[@SchrodingersBox]

thank you. My hope is exactly that- to make it so anyone can do it. And they can!!

[@ozzstars_cars]

Excellent thorough diagnosis from one perfectionist to another

[@SchrodingersBox]

Ozzstar Can't argue with that!

[@joelyboyblue]

Realtime diagnosis was awesome, hope you do these more often-

[@DonaldMeader]

Hey Matt, just thought I would drop a line and tell you you are doing some great no BS Videos. You are doing a great service for us folks. THANKS ALOT BROTHER! keep up the good work!

[@SchrodingersBox]

Thanks for the heads up man! I'll keep on truckin!!

[@dham99]

Very helpful indeed! I often have people asking me, 'how do you know so much about cars?!'...i answer back "I dont." Logical deductions, educated guesses, process of elimination. Air, Fuel, Spark. The only things a typical car needs to run properly. Intermittent, all the time, when did you notice, etc are all basic questions that eliminate almost 90% of what the issues you'll test could be. I get Chiltons for my cars but for the most part just start tearing into things....videos like yours have been my education for years and I've even made plenty of my own 'how-to' threads on forums similar to this... to hell with the haters, they'll never amount to anything car related and if they dog do-it-yourselfers in videos like yours, they're not really the enthusiasts they claim to be! I stumbled across this video researching my 2016 Focus ST (performance stuff), but glad i did. Cheers and keep on doing what you do!

[@SchrodingersBox]

Thanks man. You nailed it- almost every video is the first time I have ever seen a particular car much less the problem with the car. Its the process, not the experience that allows accurate diagnosis.

[@sypher0101]

Great video! Couple of Questions if thats ok? 1. Did you only check for spark on 1x plug? 2. That spark plug tester light would show spark in the leads.. can the plug itself still be bad? 3. Can I use my 12v car battery, connect to the Fuel pump directly to see if it powers on? 4. I have a 2001 Isuzu Rodeo 3.2L V6. Where's the best place to find what replacement model/serial etc.. pump I need ? Thanks :)

[@milolll]

Great process! just curious, can you swap the fuel pump motor, use the old casing with the right slot pattern?

[@steveynixon178]

Yes

[@djjammindave]

ARE YOU A TEACHER OR INSTRUCTOR IN YOUR COMMUNITY COLLEGE? CERTAINLY YOU SHOULD BE A GOOD ONE. YOUR VERBIAGE AND EXPLANATIONS ARE RIGHT ON POINT. EXCELLENT VIDEO.

[@juniorreds9495]

Great job well done step by step process for someone who say that he not a auto mechanic by profession did a fan good job ,I having the same came car problem but after watching this I comfortable I can fix this problem You get a five star rating

[@SchrodingersBox]

Thank you!!!

[@james697218]

im a good mechanic i have a page on facebook and i get lots of bussiness as a mobile mechanic. i sprayed starter fluid in the throttle body and the car started just fine ran a few minutes and died im going to check the fuel pump by taking off the fuel filter underneath the car and then turn on the key if the gas dont come out of the fuel tank then its the fuel pump. but of course ill check all the fuses before replacing the pump. after i check the electrical if the pump dont work ill change it out and that should fix the car. 2003 ford focus also has a starter relay fuse in the box next to the battery and if you change it out it could also fix the problem. but im sure its the fuel pump because the car was being driven and it just died. it starts with starting fliud so that tells me its the fuel pump. blevins auto repair on face book alturas ca

[@SchrodingersBox]

+James Blevins If fuel comes out at the filter how do you its at the right pressure?

[@james697218]

+Schrodingers Box . i would use a fuel pressure gauge on the fuel bleeder on the fuel rail

[@roydmundongo5283]

Great job you are an amazing teacher

[@ToyManFlyer1100]

Tell me you a Car Genius without telling me you a Car Genius....👍👍

[@drummerdnoneya5604]

You have a lot of knowledge mate. I’m a qualified automotive technician and you have a lot more knowledge than most that I’ve worked for or with!. Keep up the great work mate🍻

[@SchrodingersBox]

Much appreciated!

[@seanwodicka2036]

Please get a power probe i dont know how i managed without it.

[@eclectarama]

"If you're anything like me - and my apologies if you are...". I nearly jettisoned my English tea over my English monitor... Great work Matt, I can lose a lot of time on this channel. Time well-lost in my view.

[@Tygo2021]

very informative the way you conduct your work ,not to much talk but a lot of information.

[@Dr.LessCharacter]

Ur not a Mechanic? Uhh ur better than most Technicians!

[@SchrodingersBox]

Well thank you! Been doing this as a hobby about 10yrs now

[@mrghiax]

Great fast clean diagnosis. Puzzled by the 17 thumbs down - I couldn't see anything wrong with your explanations and methods at all Matt. As the saying goes "you can't help some people"

[@SchrodingersBox]

+mrghiax Exactly. Many of the thumbs down are from "over the hill" professional mechanics that realized their vacuum gauge and dwell meter are useless in today's world and the fact a DIY can work on computer controlled vehicles frustrates them. I see it all the time. Others just thumbs down because the video is longer than 3 minutes. And others, believe it or not, are just trolls that actually subscribe to my channel and thumbs down the instant I make a new release despite the fact they watch and learn from the entire video!

[@arcdraw]

I just had a no start this week on my Mazda 3. My fiancé would turn the key and nothing would happen. The cabin light wouldn't dim so I had a feeling that the starter was not getting power. Quick check of the wire lead me to a bad starter. A few taps on the starter with a wrench got it going enough to get it home. Before I even thought about calling the part store I performed the voltage and resistance checks to be 100% that the starter was the issue. Used your technics (minus the power probe, which is on my list by the way) and confirmed the wiring was not the issue. Changed he starter and it's been running great. Thanks for taking the time to make these diagnosis videos! Oh and GO BILLIKENS!!!

[@SchrodingersBox]

arcdraw That's exactly how I would have done it!

[@arcdraw]

That's great to hear. I'm on my way to being in the 2%!

[@mikepratali5582]

arcdraw Nope that is "has joined" to the 2%. You have arrived with DVOM in hand and for some reason a brown cardboard box?

[@SchrodingersBox]

Agreed with Mike! people don't properly diagnose things by accident. They may guess right, but not diagnose right. You clearly "get it" arcdraw!!

[@arcdraw]

Thanks for the worm welcome, guys!

[@billyr9840]

Matt, the no crank, no starts are the best. Your viewers get to learn real direction so they won't make the incredible mistakes that neighbor did and waste a lot of that woman's hard earned cash! Great vid and congratulations on the 20,000 subs! Sweet!

[@SchrodingersBox]

Billy R Thanks Billy! I agree- no starts are the most fun- take a break from the scantool!!

[@rupert1124]

Hi, just watched your video.Fantastic.Your fault diagnosis covers all the possibilities. Better than any manual.Keep those movies comin. Thanks.

[@defconone1498]

I"m having a no crank/no start problem but there is a fast ticking sound (from the starter). My problem is highly likely to be the battery and I'm waiting for a boost (my car had the windows open last night and it rained so a short somewhere probably drained my battery). In the meantime, I watched this video and I am so impressed with your skills not only with the mechanics but your ability to explain in common language. I would heed your warning and never touch the relays but I am learning about the general functioning of the engine. Thank you so much for your videos and I will subscribe and I've learned so much already.

[@SchrodingersBox]

Private Netizen Your possibilities for that situation are bad relay, bad battery, bad starter/solenoid or voltage drop at the starter. I have videos on all of these so solving your problem is assured.

[@lukewarmwater3018]

Thank you...i have a 2002 ford focus....cranks wont start. Changed fuel filter, spark plugs....im gonna do the starting fluid test today....awesome video keep it up

[@gerryf8894]

I loved your full in-depth video

[@hooplernono7033]

Really ,thank you for your extra work! I hope your channel will rise up!

[@Sandbag1300]

One of the best parts of this video is at 0:58 when the car comes off the flatbed truck. That is priceless. The next time it comes out of your garage it is diagnosed and fixed if the owner has the funds. Has to make you feel great.

[@SchrodingersBox]

Sandbag1300 Yes it is satisfying. That tow truck driver is Joe- coolest dude ever. My driveway is VERY sloped, he perfectly lines up the cars so they just drop right into the garage so I don't have to figure out how to push them up the hill. Most every other driver will just drop it in the driveway at best. Takes him longer but he gets regular business from me.

[@707SonomaComa]

Fantastic video. Full of information in a short amount of time. I didn't have to fast forward through any of it. Now I gotta check an old car, 1989 Mercury Tracer with 401,000 miles on it, for a no spark. Just totally died while driving it. I need to see if you have a video on that. I purchased a new distributor & coil because they are a few days out once ordered. I need to diagnose before installing them.

[@dreamer2355]

Another great video! If i have a crank no start at work with no sounding fuel pump prime (vehicle dependent), my go to tools are usually a dead blow and a test light lol

[@SchrodingersBox]

dreamer2355 Nothing wrong this the dead blow test! But is it bad fuel pump or are you shaking up a loose ground to the frame? Still need to directly test the pump to be 100%

[@dreamer2355]

Absolutely! But if it starts, it makes it easier pulling it into the bay!

[@thamiralqurashi8604]

informative , direct , and clear diagnosis , Greeting from Saudi Arabia

[@bmw-e30]

Very thorough and clear explanation with high quality video

[@wysetech2000]

Another logical diagnosis to a problem. Awesome job, Matt.

[@SchrodingersBox]

wysetech2000 It's the only way to go, eh!

[@wysetech2000]

Schrodingers Box As a Canadian, I would say that's right eh! {:-)

[@SchrodingersBox]

wysetech2000 Or would you say it's "aboot right"

[@wysetech2000]

Well, maybe some of us.

[@oibal60]

Superb! Inertia fuel cut-off is another 'quick check' (for me). When I crank I check for a slight movement on the tacho - to 'quickly' verify the crank position sensor.

[@geekdiymechanic4539]

Good job. I was expecting spark. My Focus had an ignition control short to ground. The control line rubbed through insulation on egr tube and, of course, pulled down circuit and fried the coil. The coil had a big crack in its bottom. Thanks for posting.

[@cesardeluna4560]

Thanks for the teaching and your pacience for comunicate your knowledge brother 🙏👍

[@SchrodingersBox]

So nice of you!

[@rhkips]

I will never forget watching a video on KZbin of some guy ripping the back seat out of a Focus like that one and taking a sawzall to the floor pan, while saying "There's supposed to be an access hole here," thinking that the shape of the indentation was them forgetting to cut the hole... Another awesome diagnosis! Quick, efficient, and methodical; exactly what I like to see! Amazed that the parts store gave you the wrong pump, though. Wonder what the deal was with that...

[@SchrodingersBox]

Lol Sawzall to the floor pan?? Gotta see that one lol. Yeah the pump turns out that the wagon (this car) has a slightly different style than the other models. Parts store computer didn't have that info so ended up with wrong part. I'm actually not even 100% sure the one on the way is correct in fact!

[@rhkips]

Schrodingers Box Oh geeze, I hate that! Good luck man, and keep us posted! I must say, that has to be the most adorable, tiny little fuel tank I've ever seen come out of a car... LOL

[@edwardperez7665]

Great video very clear and con cise. Right to the point no B/S, my kind directions with a no nonsense tone. Outstanding. Thank you.

[@georgeheri895]

I get it the thumbs down is the person who had the car befor you and replaced everything but the kitchen sink. good vid.

[@SchrodingersBox]

George Heri Hahaha yeah it's especially easy to do swaptronics on someone else's dime.... I guess. I wouldn't know. If I make the wrong call on a part, I pay for it. That's why I wanted to be 100% sure on this pump so I don't eat $200

[@danielcorrea8885]

Perfect this is the most understanding video I see with all explanation from the beginning and finish thanks recommended

[@SchrodingersBox]

Great to hear!

[@holyman7820]

you right I follow your channel and you help me a lot. I do mechanic most are my cars or family and friends, you should have millions of subscribers you teach really good I just replace fuel pump of my dodge 2500 v10 thank you for all your teaching

[@labradormcgraw2409]

Simply brilliant. Absolutely... brilliant.

[@robmut1357]

Great video! I don't understand the mindset of the "98 percenters" who just shoot the messenger. I just fixed my sisters vehicle with a low temp code which turned out to be a stuck open thermostat. But what was the first thing I noticed? Right. A brand new temp sensor. I suppose that if a neighbor came to a "98 percenters" front door and said "hey man, your car is on fire", he would turn the garden hose on him. Keep up the good work.

[@SchrodingersBox]

Rob Mut I agree- I don't understand the mindset either. I mean I know not everyone has a strong knowledge of cars and systems, etc- but even then, you know when you are just guessing instead of either letting a pro do it or at least trying to do enough research to learn how to test if you guess is accurate. If I am unfamiliar with a system I learn about it first, it seems so obvious to me at least that there is no other way. I don't get it.

[@Znobyrd]

Great video, thanks. Trying to diagnose no start on '99 Mazda 626.

[@twest0011]

I love you man , straight and to the point and very well understood , we both think along the same level but you got me beat on some things , love your vids and i watch hous of them , god bless you and keep going

[@SchrodingersBox]

Tim Westminster ALL people with critical thinking skills think the "same". The difference really becomes knowledge, not thinking strategy. This channel is designed to give people such as yourself the knowledge to "plug into" your already existing critical thinking strategy so you can cover all the bases.

[@paulbryant8402]

Why these guys tumb are down.... This guy does a very good job 👍👍👍👊👊

[@SchrodingersBox]

Thanks. My guess is it's because they don't understand the process of diagnosis vs just parts changing. "A car repair video and he doesn't use a wrench? Thumbs down!!!"

[@brandonlewis5045]

You are awesome man! I really like your videos because you cover everything fluidly. Alot of guys leave things out. I'm subscribed as of now

[@virc4541]

Thanks for you great work in this car and your very good explanations in all the process..just simple and usefull!!!...greetings from Guatemala City!!!

[@rolandespinoza2]

Please do more video like this. I'm new to your channels best of luck man.

[@paulbuckley3349]

I like your channel the best, great logical direction and results.

[@peterdatechmen5506]

nice vid, enjoy the clarity. Wish all on call outs and garages followed this 101 procedure. I usually teach my apprentices and staff to give the tank a few wacks while ign on or someone cranking,often pump will actuate and verify quickly a fuel pump fault. (of cause ensuring brake on and out of gear or in park!)

[@SchrodingersBox]

+Peter datechmen How do you confirm if the whacks indicate it was the pump vs wiring?

[@Sandbag1300]

The new video opening is great. I do not use my dewalt electric impact driver when I am around open gasoline vapors. Use it in a dark room and watch the sparks that tool puts out. Saw the tool in a few of your camera shots.

[@SchrodingersBox]

Sandbag1300 Yes the impact was only used for removing the support straps. Once I removed fuel lines, the tool and lights were moved far away.

[@DavidMartin-wq5pn]

Matt, I bought a new Focus the first year they came out and in the next two years had Ford replace the fuel pump five times. Kind of like the Takada air bag story. Love your chanel. Dave

[@montanafuller6266]

This helped a good bit for my 2001 my valve for my fuel rail is under the rail on the passenger side under that little bracket

[@Top5AutoRepairs]

this one is actually one of my favorite videos and fasttec video. you're good for a diy.

[@tiitsaul9036]

I do like the fast flowing format.

[@SchrodingersBox]

Tiit Saul Me too- I can see after 10 no starts it would be cumbersome to re-explain how to do the testing and what to look for each time.

[@marleythechameleonandherbi2724]

Easter to drop the tank than remove the child seat. LOL I'm with you man! Awesome videos!

[@alamzeb6342]

your work is shining bro.

[@donniechamberlain1074]

thanks man that helped me out alot i got my focus running thanks again

[@crishernandez7017]

you are the best and jimthecarguy and fordtechmakuloco your videos are the best tanks

[@danube466]

very logical to understand this guy

[@Try2-Imagine]

2004 focus with blown noise cap filter. Replaced it and car starts and runs fine

[@williehill6144]

Loved the diag. My grandson has a symbol problem. When you turn the key to crank the vehicle, it won't stop cranking, you have to physically turn the key off. ???

[@trainer2018]

Good job as always Matt. I have a suggestion though that will save you some time in the accuracy of the diagnostic. When you unplugged the relay for the Fuel pump you should have found a way to tap off of the contact and coil side of the relay with it still plugged in. I know you put power at 87 and the pump didn't work, but you didn't get a true Voltage drop for pin 30 and 85 and 86 on the coil side. So if you had a problem on the feed side or coil side of the relay circuits you wouldn't see it because you are checking the wires with the relay unplugged. So if it was a problem on either of these two circuits at the relay base, you just pulled the tank down for nothing and wasted your time. Hope you don't take this the wrong way, just observing and trying to help. Been wrenching 18 years and have been around the block a bit, including getting my butt kicked on different problems, and learning from my mistakes. However I try my best to share my knowledge so other people don't have to make the same mistakes I did, and hopefully it will save them some time and frustrstion. Like what you have done with the channel, looks great dude.

[@SchrodingersBox]

What Juergen said. the power probe has a green indicator light when it makes contact, so I know for a fact I sent 12V towards the pump from the relay box. The fact the pump didn't run means relay box is eliminated- the problem is downstream of that. The decision to drop the tank was because it was such an easy design. if I had to remove exhaust or whatnot, I would have gone to inertia switch and tested from there.

[@trainer2018]

I understand that the pump did not turn on when he put power to the contact output. And I am in agreement with his thought process, it's just in the past I have encountered multiple problems with circuits and you need to Volt drop check all circuits involved that make a component work, that was my point. Another thing you could do to the relay if possible is take off the relay cover and see if it clicks when you crank the Engine over then look at the contact side output Voltage and make sure this isn't much drop between the contacts with a Voltmeter and with the relay plugged in. Of course you might not see very much drop at all in this case on the relay contacts because the pump is open, so no current flow, no Voltage drop. Unless the relay had extremely bad or corroded contacts.

[@trainer2018]

Schrodingers Box I understand perfectly Matt, you were spot on there, it's just like I said in a previous post I have encountered multiple circuit problems before and you need to verify all circuits involved by doing a Voltage drop test with the relay plugged in. That way you know the contact supply wire is good and that the coil control power and ground is good. That way when you finish the job you know all circuits involved are good.

[@SchrodingersBox]

Had the pump started when I sent 12V to it, I would absolutely have been voltage drop testing those contacts. In actuality there wasn't even a need to verify the relay box at all if you think about it- I only did that because I was already there and wanted to promote my relay video lol.

[@christianobrien4465]

Absolutely excellent video presentation!!!

[@SchrodingersBox]

Glad you liked it!

[@christianobrien4465]

@@SchrodingersBox same problem I’m having with my daughters 2002 focus de sedan automatic. Car just stopped dash went black. Our mechanic changed the ignition coil wires and plugs called us and said.. “runs like a new one”! So we went paid $500 plus $127 towing and about a mile from his shop my wife turned a corner into our neighborhood and same problem car shut down. Another $127 for more towing. Then a call from mechanic stating he ordered a new PCM. A few days later he called again daid he installed it. Car started but after 5 min running he said “the new coil shorted out because of new computer so… he bought another computer and another new coil. Now it runs great but he said when he went to test drive it the transmission won’t shift past 2nd gear so he said he’ll keep “hunting down” the problem. So as of today Monday 01/30/2023 the car is sitting at his shop still… the focus NEVER had any problems. I live in Georgia so ZERO RUST shiny perfect paint perfect interior engine and trans are excellent the car is beautiful.. literally like new. 118,400 miles (my wife barely drive the damn thing. Just sad and down is all

[@SchrodingersBox]

Sorry to hear, sounds like a terrible ordeal.

[@skip741x3]

Im 64 and have been wrenching since I was 16...I also approach no starts the same way...The are 3 factors involved always...Fuel, spark and compression... if all 3 are there ,you Will get a start or at least it will Attempt to run.. if any of those 3 fundamentals are absent, its a no go.

[@TubeScrewed]

I have a 2000 Ford F150 that I've run out of ideas, trying to fix a no start situation. The symptoms are classic of a fuel pressure problem. Once I spray starter fluid in the throttle, it cranks and will crank fine until it sits again for 12 or more hours, and not always will the problem occur, but the cold seems to increase the likeliehood. I have used a scan tool and a multimeter, among other tools to rule out the MAF, the IAT, the TPMS. I've ruled out the PCV. I've replaced the Fuel Pump. The Fuel pressue regulator, fuel filter, checked pressure. looked for vaccuum leaks. I recently took all the fuel injectors out, and thought I found the problem, when one of them wouldn't hold air pressure from an air pump. I replaced all the injectors. Same problem. I'm about ready to rig a can of starter fluid with a servo that squeezes the trigger, to a toggle switch in the cabin, and put it in the inlet hose. Can any one suggest something other than everything I've looked at?

[@SchrodingersBox]

What was your data that indicated yoiu needed a fuel pump? I would totally start there.

[@TubeScrewed]

I was getting low fuel pressure, when I measured at the shrader valve (about 30 psi), which is low according to the spec. (28 - 45 psi), and after ruling out the fuel pressure regulator, and fuel filter, or any visible kinks, or blockages in the fuel line, and lots of testimonys on the internet, I concluded it needed a fuel pump. After replacing the pump, the pressure level with the gauge didn't improve at all. When I finally put the fuel injectors in, the pressure actually improved about 5 psi. When this happens, and I monitor the live data, the Short Term fuel trims, on both banks are around 85-95%, and the MAF, IAT, O2, all report, what I would expect, but it's like the Short term fuel trims are maxxing out, trying to provide enough fuel. I'll go back, and see what I may have missed.

[@5e34nut]

Amazing diagnostics keep them coming

[@SchrodingersBox]

More to come!

[@njaneardude]

I don't own a car (don't need one) and pretty sure that I don't even own a screwdriver (okay, I don't) but for some bizzarro-world reason just totally fascinated with your car problem diagnosis. Just amazing. So, ever worked on 90's Jags?

[@SchrodingersBox]

Just saw this comment. That's cool you watch even though you have no car lol. Based on your screen name I'd say you probably just have appreciation for my scientific approach which is really the point of these videos anyway. Sorry I missed your great comment until now!

[@njaneardude]

+Schrodingers Box - I've owned 32 cars in my life, so far, none now! I told my friend with tools about your channel :-) Stay warm!

[@davidessien5465]

Thank you great engineer

[@bobleenko512]

SO WELL said on the flat rate pay issue vs. "diag guessing" when the percentages are in your favor. Any full time certified tech faces that decision every single day. Once in a blue moon u eat one but you must use expediting guessing to bring home a good paycheck consistently. Thx. Great video too man.

[@Eftpos4u]

I love your knowledgeable strategy. As one of the leaders in Rule Based Artificial Intelligence, my job was in identifying "Experts" in various fields, to pick their brains. You would be perfect for that task. Now I have a Ford Falcon 2000 with a no start (cold). I had it towed to the Auto-Electrician, who had inspected it, tested a fuse and manually got the engine to turn, so he could run a full Computer check on his $70,000 machine. So far $70 for the tow and $99 for the test (tomorrow). Are Australian Fords different - why MUST every problem be Computer caused? Can we fix the basics - getting the power to the starter, from the ignition switch, without using a computer to diagnose the car's computer.

[@SchrodingersBox]

As shown in the video you need to process FASTTEC to determine the no start etiology. I do not see that you even started this step yet. Once you do I can help.

[@mikejmardis]

Good looking out on the flat rate comment. One test you could’ve done that’s real quick is to put a fuse loop on the fuel pump fuse and see if you have amp draw consistent with a pump B- if you have a scope, really see what is happening at the pump Awesome job confirming though. I wish there was time to be that thorough all the time. I would be called the pump w/ an amp test on a scope and then confirm the fix

[@SchrodingersBox]

Yes at the time of the video I didn’t yet have a scope but now, that is exactly how I do the testing.

[@marymarlowe5788]

Im your biggest fan. Brilliant!

[@SchrodingersBox]

Much appreciated!

[@deepsquat600]

Well Matt years ago I diagnosed my 78 Celica with bad fuel pump ..put in new one ..but then though Hey let me bench test the old one.. it shot fuel 12 feet ..so it was my wiring I ran a wire to a switch ..bing anti theft switch/ fuel kill ..so yes the wires do go bad :)

[@SchrodingersBox]

deepsquat600 Yes my very first video I did had burned up wiring to the pump itself inside the tank- so technically a wiring problem but since it was inside the tank it's best to replace the pump anyway. MOST pumps I replaced had this condition in fact- it wasn't technically the pump itself, but actually voltage drop from inside the tank itself

[@keithdavis3411]

Car would not start without stepping on gas, it's fuel injected. Thought throttle position sensor was BAD but it wasn't. Checked and ohm meter air temperature switch, coolantswitch, and they were ok. Fuel pressure regulator was ok per vacuum check. Fuel pressure with just key on was zero but stepping on gas with crank worked. At idle has 35 psi normal but pressure did not go to 43 psi when shut off. I will check for 12v at fuel pump before installing. Thank you for a pro diagnosis

[@CHIBA280CRV]

Excellent , waiting on the new fuel pump video Lol ...

[@louifinou3442]

Thanks for the video . It is a sound algorithm but for me I can't tell if there's a good compression or not because I am a biginner

[@pauldelamere9405]

My ford transit is cranking with no start, I’ve now watched a few of your interesting videos and hopefully I can fix my starting problem, have you ever thought about moving to Scotland 🏴󠁧󠁢󠁳󠁣󠁴󠁿👍👍

[@SchrodingersBox]

No I haven’t lol but You can do it!

[@johnwrench4speed]

Interesting video. I wish when you are filming and using your Power Probe we could see the indicator lights. When you were using the Power Probe in the PDC (power distribution center) at the terminals for the fuel pump relay, I did not see a green light prior to your application of power to the fuel pump. This indicates to me (i.e., no green light) that their is an open in the fuel pump. Same thing with testing on the bench; when hooking up the Power Probe to the old fuel pump, with ground lead attached to the fuel pump, and prior to applying power, there should be a green indicator light. Finally, when diagnosing a fuel pump many times (from a limited tool standpoint) a test I and many technicians/mechanics employ is banging on the gas tank with a rubber mallet (to free up a frozen fuel pump).

[@SchrodingersBox]

johnwrench4speed Yeah I agree- I noticed in editing that my finger was blocking the green light indicator on the probe, I didn't really notice the camera angle at the time because I was so focused on making sure I was sending voltage to the right place- I'll watch that next time. I actually did try the "percussive technology" technique but didn't film it because it isn't really a test consistent with the theme of the channel since it does not necessitate the pump is bad- it could also just be shaking the wiring or ground so still necessary to test the pump directly to be 100%.

[@williamcollejo4418]

You are a good auto tech. Thanks for the video

[@SchrodingersBox]

I appreciate that! I am not a tech though- just a hobbyist. I love fixing cars is all my background is.

[@messer7bc]

Easy, simple one. I've been here, anyway. ;) BTW. Very nice call for voltage drop as one of possibility. I smiled at this moment ;)

[@DJDevon3]

Excellent video! That is how it's done. Bravo. I can't think of 1 thing that you didn't properly cover along the way in your diagnosis other than explaining why you MUST test for fuel pressure and not just flow. RealFixesRealFast has a great video on that called "Don't Let Fuel Volume Fool You". Turns out that was exactly what was wrong with my pump too (split in the rubber hose). I'll never forget that lesson now.