96 Jeep, No Start, No Com with PCM, No 5v reference (Quick Tips)

[@ScannerDanner]

I'm sorry I was not more clear about the direction I took and why in this video. I truly felt going into this job (fuel pump running continuously and a no com, that we had a shorted reference circuit (I've seen it many times). Then with me teaching a class of 20 students while live troubleshooting, I got tunnel vision. But these procedure shown are super important to know how to do as 99% of people are lost after checking fuses. What do you do when the fuses are good? "Must be a bad engine computer"...nope, it sure isn't :-) So I will say this again, yes, I should have started with fuses, but do yourself a favor and watch the shorted MAP sensor video and you will have a better understanding. No Start from a shorted MAP sensor (Honda, Acura) kzbin.info/www/bejne/sJKUZIikpcd7bac

[@sorefoot6329]

I’m a DIY guy with a decent arsenal of troubleshooting equipment. I work on all our cars (2 that are over 200k miles and a truck at 150k) plus help a lot of friends/family. Stumbled across your videos working on one of our vehicles and have watched a lot since then. Sometimes I find myself saying “Why doesn’t he just.....?” but then I remind myself that you’re teaching systems and processes and concepts rather than a specific procedure. I actually think some of your best videos are like this where you get to a fault taking a little round-about path because it shows more of the whole picture. Someone at home might have been inclined to chase why the fuel pump was running full time and they would have eventually gotten to powers/grounds at the computer, found the fuse, and then (hopefully) looked for the cause of the fuse burning out. It’s not direct, but it’s not necessarily wrong either.

[@htownandre7385]

I have a 96 buick roadmaster with a 5.7l v8. I recently lost all fuel pressure. I've replaced the fuel assembly, fuel pump, regulator and relay. I'm still not getting any pressure. I can hear the relay and pump cut on when I turn the key but still no pressure. Please help scanner danner. I've tried to find a mechanic but everyone keeps turning me away. Do you know of anyone in the Houston area that can help me???. Please help scanner danner.

[@ScannerDanner]

@@htownandre7385 you can hear the pump? When you replaced the pump, was it the entire assembly or you pieced just the electric motor into the fuel pump assembly?

[@htownandre7385]

@@ScannerDanner pump runs fine. I pulled the return line off the regulator and jumped the pump get plenty fuel shooting out the return valve of the regulator. This is the 2nd regulator I've tried this week. Still 0 pressure. What the hell is going on

[@htownandre7385]

@@ScannerDanner what's really crazy is that if I press the gas pedal on a crank I can get it to run at a very low idle but still no fuel pressure reading

[@warrenfromga9945]

I found this video several years ago and it saved my butt. I had exact problem on my 96 JGC. It died at gas station. Would not start after gas fill. Had it towed to my home. I had shorted 5VDC at Ox sensor. Video helped me find the problem. I have been a subscriber every since. Thanks for your efforts.

[@ScannerDanner]

Well, this was supposed to be released tomorrow at noon, not today lol. Hope you enjoyed it. Way more time than you think was spent on making this video

[@SmittySmithsonite]

We appreciate your efforts!

[@complot72]

One thing to keep in mind, unplugging a sensor assumes the short is in the sensor. This video showed us that a harness can be shorted as well. Unplugging the sensor would not have caught that. However, checking the fuses would have pointed a technician in the right direction eventually. Thank you for the awesome videos you provide us with Danner!

[@ozzstars_cars]

I remember the long version of this video years ago. I'm getting old.

[@ScannerDanner]

We both are my friend!

[@tnamen1307]

@@ScannerDanner my car i20 has a SDVC function. Is this signal coming from the vss speed sensor? How to locate the wire??

[@Bastard_Operator_From_Hell]

Instead of cutting a perfectly fine wire, why don’t you remove the pin bushing from the connector housing with the appropriate terminal removal tool and simply push the pin pushing back into the connector housing when done? It takes only a few seconds. That’s how I work. Other than that, you have a real gift of teaching. I learned a lot from you.

[@ahmedhamoda2995]

Thanks for being there for us, we really appreciate your help and support 🙏

[@wyattoneable]

"Heat and vibration". Something I learned from you a long time ago. It sticks in my head everytime I look for a wiring issue. :)

[@ScannerDanner]

It holds true time and time again, doesn't it? Thanks Wyatt!

[@DawonneJones]

facts chrstler and there electrical shit smh

[@kennysherrill6542]

Thank you for the tips, my 96 Grand Cherokee 5.2 died on me going down the street, no spark. When I started the car that day I could hear the fuel pump running which I never heard it run that loud before. I'll be running those test tomorrow. 👍❤🇺🇸

[@mannyclemente7159]

Mr. Danner, thank you for all the knowledge you share with us! You’re a great teacher, and I look forward to all the videos you have made and future uploads.

[@robgreen7576]

Your enthusiasm and teaching methods are infectious great viewing.

[@nickayivor8432]

What do you call PRODIGY ,SUBSTANTIAL, KNOWLEDGEABLE the answer is Sir ScannerDanner Thank you very much,take care and have a great day Sir ScannerDanner From Nick Ayivor from London England UK 🇬🇧

[@REPOOCNITSUJ]

This is a really cool idea. I like that you correct yourself too (saying you should've checked fuses first). Hope to see more videos done this way.

[@josmith5459]

Im having a similar problem with my 01 cherokee 4.0 thats been driving me crazy,fuel pump runs constantly even with ignition off,but i think you have gave me some really helpful information greatly appreciated.

[@ykmulwanda1638]

I got confused because I watched this video sometime back yet it was showing a day ago(today 02/05/2020). Im always thrilled how you handle issues. With your steps I'm pretty certain your class is so lucky. I wish I was one of your students. Danner, stay home, stay safe I need you for many years to come.

[@bradfaught1695]

Between you and eric. O I've learned alot about electrical diag. I learned the basics when I worked at a dealership, but you've taught me alot about how to diag without a diagram. My brothers side by side wouldn't start , when I jumped it the battery voltage is around 11 volts at idle. I Googled it and saw that the voltage regulators sometimes go bad but I didn't want to load the parts cannon without being sure....I tested the stator, 18v,17v,16v good, I tested the voltage regulator 16v good. I didn't have a battery tester but you better believe I ordered one after that. Thank you and hello from Indiana county.

[@sinegra30]

Thank you! You guys are amazing! I've been getting so much info from you Paul! You can't even imagine how much progress I have made in my technical career, access to proper automotive technical education in my country is non existent! Thank so much!!!! God bless you and Caleb an Kristin and your brother Danner and all your Family members! This short tutorials are amazing! Keep up the good work! You are my motivation to perhaps become a automotive technical teacher in my home country.

[@ScannerDanner]

Thanks so much!

[@vlstyles]

I think you have found your tag team partner in Caleb! His comments peppered throughout your updates make all the difference in the world!! You play the straight man while he provides the zingers!!

[@ScannerDanner]

no question! Thank you, I will tell Caleb too :-)

[@JG-kv4oi]

I wanted to hear THAT Jeep crank up 😂 Thank-you! I'm working on a new acquisition, 98 Jeep Cherokee XJ 4.0 Auto. No guages, no fuel pump, .400 milli amps instead of 5 volts at crank position sensor and cam position sensor unplugged. No blown fuse. Switched relays around. I'll figure it out 🤣🤣

[@ScannerDanner]

Check main powers coming into that ECM. If those are good, start unplugging every sensor that shares the 5v ref. VSS, MAP, TPS AC PSI SENSOR etc

[@dubblyewjay1133]

Loved the 5v ref voltage teaching. Helps me with my 2001 Ram 1500 4x4 sensors.

[@ScannerDanner]

Great to hear! Thank you

[@jdtractorman7445]

8:40, I have that same short circuit tester and it works like a champ. Back in the day I used it to find a short in the courtesy light circuit in my 1988 F-150. I was going to say I was surprised the harness was routed that way and then I saw the very end of the video, LOL.

[@gregdykes5918]

Paul, I am loving this quick tip series. Keep up the good work and thank you for all the valuable information.

[@ScannerDanner]

Glad to hear it!

[@georgenjuguna9869]

Am in Kenya and have learned alot from you,,i now have confidence in my work

[@maxwellclark7054]

Gotta love the jeep 4.0l !!

[@neutrodyne]

This is a good informative video. Thanks for sharing it. I am sure you spent a lot of time on it. One thing to also note is that without the proper service information a person would have an impossible time trying to find and fix this problem.

[@cheewurz]

Yep...you got it! I personally Hate Cutting Wires if I don't HAVE TOO! It just Introduces another Failure Point to the System... IMHO

[@willarddickerson921]

The 4 cyc jeep sounded wonderful. Thank you.

[@josemariomerced9219]

I have a 98 jeep xj 2.5 liter 4 cyl. Same problem , thank you its a great help

[@nigelclark7360]

Very good when l was inspecting vechicles yrs ago l would spend around 20 mins going round inspecting the harnesses Even when there wasant an electrical fault, many a time a would find wires rubbing through, by finding These and repairing them Saved a breakdown at road side and it could save a lot of electrical damage.

[@BigDogDiagnostics]

Paul, Love the added example of the shorted map sensor at the end! I like to physically see what the electricity is doing. Really puts the whole video in perspective. I have been watching your videos for a long time man. You have helped me through some super tough jobs, keep up the good work !

[@ScannerDanner]

Thank you Max

[@frankguerra3314]

I want too say thank you Mr scanner danner..I needed this video. I have a crank no spark no start.an I know I have a 5v problem..I. Wish I could get your book but I can't afford it but I love your videos..

[@8power0]

LOVE THIS VIDEO , I HOPE THERE WILL BE MORE LIKE THIS IN THE FUTURE . WOULD ALSO LIKE TO SEE SOME TESTING SPECS LIKE OHMS AND AMP'S THAT WOULD GENERALLY APPLY FOR ANY VEHICLE FOR IGNITION COIL , INJECTOR , RELAY , FUEL PUMP , SOLENOIDS AND FAN MOTORS . IF POSSIBLE WITH THE DIFFERENT TESTS SHOWING HOW TO TEST THEM . THANKS SO MUCH FOR YOUR TIME AND CONTINUED EFFORTS .

[@mohamedhassanmohamednafas8206]

Excellent sir thank you so much The way that you explain is so beautiful and again thank you so much sir

[@josealers67]

You guys make a great team. Caleb's window shut down. Nice. And of course the videos are great. Thanks again.

[@jasonmurdoch9936]

I know this is an older video and I know you're probably not going to see this but you made some good tips and some good points I have a 98 Grand Cherokee 4.0 and I'm having a no fire no start my gauges are going wonky I will be trying some of this stuff in the morning thank you wish me luck hopefully this fixes it

[@ScannerDanner]

Okay, I can help. Step 1, with the KOEO (key on engine off) test for a 5v reference on your TPS or MAP sensor. Tell me what you see

[@neverstoplearning382]

Quick tip series the best. Thanks a lot.

[@juelzgdo2660]

DEFINITELY GAVE ME ANOTHER IDEA ON HOW TO TACKLE MY CURRENT ISSUE 😅 ....KEEP UP THE GREAT WORK 🙏🏽

[@nickayivor8432]

What do you call INTELLECTUAL AND PRODIGY and SUBSTANTIAL and PROFICIENT and ACCOMPLISHED add two more ACCOMPLISHED and KNOWLEDGEABLE the answer is My teacher SIR SCANNERDANNER God bless you and all your family around you Sir ScannerDanner for sharing what you know with us great video loved it From the start to finish Take care and have a great day My teacher Sir ScannerDanner From Nick Ayivor from London England UK 🇬🇧

[@LyricsAndMelodyFacts]

I want to diagnose you sir Scanner why you had a windows shutdown for such long time lol!. I almost finish watching all your videos and let All the advertisements go on running. Thanks a lot for sharing your knowledge.

[@Watchyn_Yarwood]

Super good. I like the new, shorter format. Your longer videos still have a very important place too! Don't stop!

[@mohamedrahib7685]

Thanks for this video . You're the best mechanic teacher in KZbin.i like watching your videos.

[@ScannerDanner]

Thanks mohamed!

[@isalmankhan1]

An awesome case study👍 Thanks SD & Thanks Caleb😉 Stay safe Guy's❤

[@aussiefirestorm]

Visual inspection for the win, thank you Paul for all the hard work and inspiration. I still refer to your E-book regularly.

[@ScannerDanner]

Awesome, thank you!

[@throttlebottle5906]

yep, I seen the harness wasn't behind the pump where it should have been in the older footage! it's little details like that which make or break repair work, causing future issues. the worst part is, they may have seen it and decided NOT to redo the job (to beat book time) or just sloppily put on a zip-tie which broke apart long ago. I always look over everything and often find possible future issues, but you cannot catch them all.

[@danman9017]

yes the 5 volt ref is were we could get burn on that one not checking it.thank great video

[@ScannerDanner]

That is correct and it is the one that most people miss and end of replacing a computer that never needed it.

[@prentissirby6674]

Thanks for your great videos . I really enjoy learn so much from you.

[@roadtripPinas0630]

Wow!!'what a find.! Thanks for this shortened video sir!

[@vincescalise4821]

That was an awesome video, I was able to predict what you guys were going to do next step by step, because I’ve been learning from your of other videos ,This stuff is actually starting to stick in my brain Thank you for being such a great teacher Paul ,It really means a lot to me

[@ScannerDanner]

That is awesome! Thanks so much for sharing

[@IamKurr]

I've got a 2006 cadillac sts no start with no comm. I unplugged pcm connectors and plugged them back up and ended up having communication... until I went to crank it over again. Believe I may have something of the same problem as this jeep, but... more testing to be done to diagnose. Thanks for the great videos

[@BERPSU1]

Sounds like a classic symptom of a poor ground.

[@ScannerDanner]

@ BERPSU1 certainly could be

[@IamKurr]

It does. She just recently had somebody come by and put an alternator in it for her because of slow starts then she went out a few days later and *click* nothing.

[@IamKurr]

@@BERPSU1 you were exactly right as the root cause. Bad ground connection on the back of the right head. It had 800mv with koeo. Cleaned all grounds and tightened the one in the back near firewall. Ended up with 5mv on block afterwards and no problems starting.

[@IamKurr]

@@ScannerDanner all voltage drop testing learned from you, man.

[@SmittySmithsonite]

I remember this one! Going back a ways there. I've lost track of how long I've been subbed to you! Think over 5 years now. Yikes ... that went by quick! Great stuff, Paul, and nice work editing, Caleb - this couldn't have been a quick and easy edit!

[@ScannerDanner]

It wasn't! Thanks Smitty, we are all getting old haha

[@SmittySmithsonite]

ScannerDanner - Ain’t it the truth, brother!

[@dre22001]

Great video love the value best video on electrical short 👌 so far

[@billrimmer5596]

I remember that video. I have watched almost all your vids. Great stuff!! Excellent edumacation.

[@nickayivor8432]

Good Morning ScannerDanner 🙏 🌄 have a great day and take care ScannerDanner Thanks 👍 Great tutorial thanks 👍 🙏 From Nick Ayivor from London England UK 🇬🇧

[@robertmedina6875]

Great Job Paul n Caleb!! Keepem coming!

[@richardhectorlanthier9999]

Wow love your clips, i deal with electronics on machines all the time and didn't know the 5v reference, i work underground in the North where electrical circuits go bad often.i have watched quite a bit of your clips and learned a lot thx and keep up the good work👍

[@indridcold8433]

Mine has the infamous, "No Bus," error. The scanner thinks the key is not even on. Thus, the ECM is bad or crusty wiring is causing the error. The ASD circuit is shorted to ground. Before the shut down, an error denoting the catalytic converter located in the front part of the exhaust manifold was functioning far below perimeters. Maybe I should check out that oxygen sensor harness. The voltage gauge was going crazy right before shut down. After shutdown, the battery was hissing. I suspect a big shirt circuit, probably right where you found your large wire damage.

[@baxrok2.]

Yup, that's around the time I started watching, and being inspired by, you! Thanks!

[@ScannerDanner]

9 years ago my friend! Thank you so much

[@freddy2064]

🤣🤣🤣 we know it ran. Scanner Danner is so thorough no stones unturned! I like the shorter videos and no starts are my favorite.

[@freddy2064]

@@freddyvelazco4759 Freddy si usted escribe "fuel injection en espanol" le sale varios programas esplicando ese sistema. Suerte.

[@ScannerDanner]

Glad you enjoyed it

[@m.b.smoshitoa8325]

me too , i like them

[@nadeemahmed640]

Why you cut original second 5V reference?There is other option to troubleshoot....why not check ECM B+ feed supply first?If there is communication issue then we should check Ign and B+ ,B- feed supply.in my view try to save original harness because we have many other options to troubleshooting.

[@ScannerDanner]

please read my other replies and lose your tunnel vision, this is an absolute must learn procedure, sure, I should have checked fuses first, but as I said in my other replies, what do you do when the fuses are good?

[@FixItPhillip]

Great diag and summary brotha! -FixItPhillip

[@billg4630]

I have watched several of your vids...this is one your best...this will work on anything awesome

[@ScannerDanner]

Thank you! Just replied to your other question too. We need to make sure your distributor is actually turning too

[@billg4630]

@@ScannerDanner I forgot to throw that information in there I pulled the distributor cap and I grab the rotor make sure it didn't have too much slack and make sure it wasn't broken and then I crank it with a distributor cap open and it did turn just fine so that was okay and this this Motors only got seventy thousand miles on it runs perfectly until just shut off like flipping a switch while idling at gas pump during a trip

[@billg4630]

I have ohm my new crank sensor just in case..its good..im looking for burnt or pinched wires...this is a head scratcher..

[@jellyjiggler5311]

if this where a tv show i would binge watch it

[@tunbosunadeyemo1383]

Nice video,I would love to learn a lot from you personally in the future instead of watching your videos everytime. I don't really like comments but this is a very good video

[@ScannerDanner]

Thank you my friend! Please comment more

[@mikechiodetti4482]

You found it, you fixed it, Jeep back on the road!

[@ricardorenteria21]

I have a 2021 Chevy Malibu RS that has lost communication between the ecm and tcm and since I think your one of the best and well knowledgeable mechanics in the industry wanted to see if you can tell me the direction I should go

[@ScannerDanner]

Thank you for your kind words. It means a lot! Unfortunately network issues are difficult as it is, and over the internet, in text form, near impossible. What is your background? Are you a tech? That will dictate our direction.

[@bulletbobweldon1442]

Love your videos! Finally bought your book. Damn what a good investment!

[@ScannerDanner]

Thank you so much!

[@johnjohannemann1220]

Excellent information as always. Good job!

[@zyadkhalid6139]

Good job Mr. Danner I love your job

[@salvadorgutierrezr5914]

Good teaching Scanner Danner, and thanks for the video👍👍👍👍👍👍👍👍👍👍👍👍👍👍

[@brianburch8062]

This was HUGELY helpful! Thanks!

[@ryaninshanally6369]

Great job my brother,love the shorter video.

[@ScannerDanner]

More to come!

[@lesbender236]

I am not pro by any means,but what I do when looking for shorts,is to substitute a light bulb in place of the fuse,so when you find the short the bulb lights so as to not waste fuses and when you move a harness you may see the light flash as the short comes and goes.The bulb needs to draw at least as much amperage as the fuses' rating. I simply soldered wires to a blown fuse and connected a headlamp to it,so just plug into fuse socket.

[@ScannerDanner]

You can do that but not on circuits that have low resistance outputs. Your test light can easily find a path to ground through the fuel pump and O2 heater circuits and would light just as brightly as if you were connected straight to ground. So, you can use that method but you must know about this variable or you will absolutely chase your tail on some cars.

[@lesbender236]

@@ScannerDanner I agree,but if you have say a 5 amp fuse and the test light .in this case a headlight bulb that draws more than 5 amps,it will not light until there is low enough resistance to draw whatever it requires. I was not speaking of a regular test light,in which case you are correct. Thanks for responding

[@ArimaDiaz]

Bro, I had this problem 2 years ago love ❤️it , I kept my Jeep after I sort of found this issue through the long way of doing things 😭🤣

[@mostlymoparih5682]

Good stuff as usual Professor. Happy Motoring.

[@georgebonney90]

Great fundamental lessons,thank u mr danner👍

[@redlegs3835]

I also changed out the sending unit in the fuel tank. Put in new fuel injectors delphi sending unit.. Turn vehichle on turn it off check fuel pressure no fuel pressure at shcrade valve.

[@patrickoneill9650]

Awesome diag u da man :) Ive got 2003 4.0 no juice to the Fuel pump think its the computer im told this is common

[@caliman823]

Great video. Learned a lot and easy to understand.

[@zach914v8]

Dang it Danner, 4:51 seconds, maximum bro. Lol

[@abdalqadr1]

Amazing videos thanks again from Iraq❤❤❤❤❤

[@sammalaa3258]

thank you master danner I enjoy all your videos

[@ScannerDanner]

Glad you like them!

[@alaautotonics4403]

great series well done God bless you bro

[@Pablo_Automotive]

Thanks Paul another Great job and explanation

[@mechanicmatt871]

Nice find, and great explanation. Your videos and book have definitely been a huge help to me.

[@ScannerDanner]

Awesome, thank you!

[@jugubantan7740]

Nuttin beat a little visual inspection sometimes!

[@The4thshodow]

nice summary! subbed

[@auddy3964]

I wish I could afford to get you to come down to nc, we got a 02 duango at our shop that is having a similar issue. But in the meantime I'm gonna use your videos and tips to see if we can get it going. Love the great work

[@ScannerDanner]

If you need additional help, join my forum www.scannerdanner.com It is free to join and we can definitely help you

[@gregoryfairchild2460]

Good video. Show the finished fix and start..lol how did you reroute the 02 harness. I can't tell you how many times I rerouted factory harnesses out of harm's way.

[@lawsautomotive108]

Good video Paul, have you heard of John Anello ???? I met him super nice guy. Had a good idea of a heartbeat of a vehicle if you know what I mean 😉.

[@nickayivor8432]

SUBSTANTIAL Sir ScannerDanner Tutorial Great thank you 👍 Sir ScannerDanner From Nick Ayivor from London England UK 🇬🇧

[@samuelhursti3850]

You are ACE for teaching

[@amadohernandez8182]

Thanks for everything.

[@asmautollc]

Wasn’t around for the original airing, but great vid 👍

[@v4vauxhall498]

9 years.... baby face Danner LOL......Nice one bro.

[@33798]

Your videos always ❣️ lovable

[@jamesmason5800]

glad I got to watch your video learned alot I will be watching all your videos you said some thing about a book you have

[@ScannerDanner]

Awesome, thank you! And yes, it is available on my website at www.scannerdanner.com I also have an entire training program available called ScannerDanner Premium. Check out the introduction and navigation video I have on my SD Premium tab of my website for more info on that.

[@Mjones740]

Not the same jeep , but the video is a good one for wire diagnostic.

[@bbmd2200]

I was trying to be creative by unplugging the connector with the 5v reference and test the pin to ground looking for the 5v ref. My thinking was if the regulator was cooked from a short, you would not have the 5v ref. This may not be an accurate test. I was just experimenting.

[@anthonydreher227]

Tony D love the teaching want to learn more

[@joseloslopez985]

Beautiful beautiful video tanks for your nice and helpful video

[@Royal-kohen-reeb]

All that work for just ending up just looking for torn wires lol good job

[@ScannerDanner]

Nothing was wasted as the procedures I went through were super important to know how to do. Thanks!