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

[@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!

[@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.

[@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

[@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!

[@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 🙏

[@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.

[@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??

[@robgreen7576]

Your enthusiasm and teaching methods are infectious great viewing.

[@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 :-)

[@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.

[@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. 👍❤🇺🇸

[@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

[@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!

[@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

[@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.

[@Watchyn_Yarwood]

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

[@josealers67]

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

[@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.

[@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 .

[@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.

[@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..

[@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.

[@maxwellclark7054]

Gotta love the jeep 4.0l !!

[@mohamedrahib7685]

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

[@ScannerDanner]

Thanks mohamed!

[@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 🇬🇧

[@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.

[@mohamedhassanmohamednafas8206]

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

[@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!

[@juelzgdo2660]

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

[@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.

[@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

[@willarddickerson921]

The 4 cyc jeep sounded wonderful. Thank you.

[@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!

[@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

[@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?

[@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

[@josemariomerced9219]

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

[@neverstoplearning382]

Quick tip series the best. Thanks a lot.

[@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👍

[@billrimmer5596]

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

[@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..

[@nickayivor8432]

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

[@roadtripPinas0630]

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

[@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

[@bulletbobweldon1442]

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

[@ScannerDanner]

Thank you so much!

[@ALZWE-LIBYAN-CAR-ELECTRICIAN]

Question: Some times when I check look like this. I found a blown fuse and there is no short in circuit. I think just a fuse life. Always occur when stop the engine the fuse blown. I don't know what's the reason exactly. What about your opinion?

[@NoWr2Run]

What fuse ? Car model ? year ? engine would help, MORE INFO PLEASE.

[@ScannerDanner]

no, fuses do not blow without a reason, there is always a cause. Now I have seen fuses fail but they do not "blow" out, like in this video

[@dre22001]

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

[@mikechiodetti4482]

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

[@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

[@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

[@prentissirby6674]

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

[@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.

[@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.

[@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 🇬🇧

[@MegaDysart]

Hey Paul, question: when you were checking the other leg of that 5v reference for a short, instead of cutting the wire could you have unplugged the connector since the 2 legs of the 5v ref circuit were on different connectors?

[@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

[@salvadorgutierrezr5914]

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

[@robertmedina6875]

Great Job Paul n Caleb!! Keepem coming!

[@zubairsherwani]

Hi dear, instead of cutting the 5v ref wire, could its pin be extracted from ecu connector? And measure the voltage.

[@NoWr2Run]

Yes

[@richardsalaverria9363]

I was thinking the same thing, although extracting the pin can also be a huge hassle sometimes.

[@nadeemahmed640]

I think first of all we have to check feed power in ECM connector because first he show it not communicate so no need to check 5V.Battery positive and negative in ECM is basic troubleshooting if any ECM not communicate.

[@ScannerDanner]

Yes, of course, but on this style ECM connector, the pins all want to fall out when you take the main plastic holding piece out of the connector.

[@ScannerDanner]

@Nadeem, please watch the shorted MAP sensor video that I referenced in here, then you can tell us all how to troubleshoot these circuits.

[@austinking162]

Great video. Question though, when you back probe on ohms where did you put the other probe?

[@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.

[@jamesbarratt593]

Paul I have a question where I’m seeking only guidance upon a direction to go in. So customer on Audi Q5 2.0 had oil level temp sensor say no engine oil stop. He freaked and put 6 litres of oil in. So likely it already had nearly 5 litres the amount it should have. Oil was up in air mass. Oil was bursting out seems where turbo joined into exhaust. First 02 reading stuck, rich not surprising either. So learnt on Audi Q5 when bonnet open it triggers electronics to check oil level and temp sensor. This is a variable resistor. Batt volt in. Ground. And a white purple signal out which on fluke multimeter in slow mo video shows it jumps between 200 and 800 milli volts stop on some figures in between. No scope here sorry but sensor is brand new. Checked ECM where signal wire goes and power and ground to sensor. Power and ground both good to sensor. ECM wire to sensor at at ECM is showing alternating figures suggesting wire to sensor good. Bonnet catch switch wiring on diagram goes to a power control module. So now I know on my AUTEL ms906 I can see oil height in live data. Yet behind steering wheel in dash it says key on stop oil low. Yet in middle of car dash the infotainment system it says cannot communicate with oil sensor. I’m thinking and guessing the BCM does the job of handling the low oil message. Any way you know to confirm that. So the question. What’s my direction now on fault finding this, without that is simply buying second hand replacement electronics from eBay in a set and changing the lot to get rid of this headache. I don’t want to do that. I don’t want to be a parts changer. Get my meaning

[@ScannerDanner]

Post this to my forum my friend www.scannerdanner.com I'd have to do research to answer this and I can't do that here. It is free to join, hope to see you there.

[@jamesbarratt593]

@@ScannerDanner I just did. www.scannerdanner.com/forum/newtopic.html

[@chrisdeering3965]

My 2004 jeep grand cherokee 4.0 has had me chasing my tail for months. Every possible code has been shown. Starting with the (No 5v reference) Replaced maf sensor and new wiring pig tail. All other sensors except the crankshaft sensor have been replaced. It's not fun to do. I'm sure you're aware of the difficulty for that, especially without a 2nd set of skinny arms and hands, right?. So, I've also recently replaced the ECM. It seemed logical and I was unsuccessful. The code (No 5v reference Maf sensor) came back and I think it actually laughed at me. :) :(... So then I just watched your entire educational video and I'm about to venture out to my Cheap Jeep project and look at that O2 Sensor wiring and see if someone didn't route it through the water pump as you pointed out. It makes Sooo much sense if that's the case. Boy oh boy I hope that's the problem and you saved me from that crankshaft sensor replacement. So I will give you the answer when I find it. Great video and diagnosis that no other video offered. I wouldn't have considered a second 5v wire or something like wiring improperly reinstalled against the exhaust pipe. Thanks again To be continued. Lol

[@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

[@FixItPhillip]

Great diag and summary brotha! -FixItPhillip

[@NDLAP66]

Thank you for all the vids! I am starting to get it more now.... So on the schematics, Is the Green Computer Data lines system- the 5 volt reference wires? the ones from can high and low?

[@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.

[@ryaninshanally6369]

Great job my brother,love the shorter video.

[@ScannerDanner]

More to come!

[@jellyjiggler5311]

if this where a tv show i would binge watch it

[@yoreparomicarrogratisfacilyrap]

Hi paul,I am paul what thinking about autoscope 4 engine analyzer

[@abdalqadr1]

Amazing videos thanks again from Iraq❤❤❤❤❤

[@gatordave6629]

Scannerdanner have you ever heard of the jeep 4.0 engine idling weird where the idle bounces like 50 rpm and the tachometer is bouncing up and down a slight bit?

[@johnjohannemann1220]

Excellent information as always. Good job!

[@arkanstarmarketing9620]

I bought a ‘98 Jeep Grand Cherokee (as is) it was running a little rough. I didn’t think much of it. After replacing the plugs and wires it didn’t help. Then after driving it about 10 minutes it died. It restarted and backfired and died again. It started right back up, and i drove it for about 45 minutes with no problems. It set for a couple of days, it would start run for a couple of minutes then die. It would have to set for a few minutes then it would start and repeat the thing. I borrowed a code reader and the only code was bad ignition coil. That made sense so I replaced it. Now no codes show up, so I checked the 3 sensors and left them unplugged and ent to the next one all read 5.1 volts. The electric door lock doesn’t work on drivers door, but once in a while it makes a noise. One electric window doesn’t work. Could this cause it to run and die? Another thing I have no idea how long it has been setting, it has only 94,527 mile and has a salvage title. Could old gas cause this problem? Sometimes it will run for 30 minutes to an hour with no problems. So while it was running smooth idling about 600 to 700 rpms I started wiggling wires and when I got to the first cluster of wires on the computer, t6he plug toward the motor it died. I thought I found the problem, so I made a wedge and slipped it in to hold it tight. I drove it about 5 miles and it died. It died 3 more times before I go it home. So now I’m totally lost. I bought this for my grandson, now he said he didn’t want it even if I get it fixed. So I’m going to sell it, and try to recoup my money. I can’t sell it like this, I need to fix whatever the problem is. Can you help, got any suggestions? Thanks in advance for your thoughts.

[@waynegram8907]

Scannerdanner, what is the name of that short finder tool you used in the video its a silver grey meter with a RED light. I haven't seen you use that tool so I don't know the name of it or how its used. I think you connected it across the ABS relay terminals and was moving wiring harness to see if the RED Light would turn on?

[@ScannerDanner]

I have it listed on my Amazon affiliate account www.amazon.com/shop/scannerdanner

[@waynegram8907]

Nice thanks ya it shows a lot of your tools you have used in your videos I have seen before. I don't think I have seen you use that short finder meter in other videos. Before cutting the +5 volt wire, you could have just unplugged the Harness connector to the PCM Computer and measured directly to the +5vdc pin and ground to know if the PCM computer is output +5vdc with the harness connector removed?

[@mattparker7985]

Great video! I think you might have just helped me solve my problem! What make and model were you testing on?

[@mechanicmatt871]

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

[@ScannerDanner]

Awesome, thank you!

[@zyadkhalid6139]

Good job Mr. Danner I love your job

[@mostlymoparih5682]

Good stuff as usual Professor. Happy Motoring.

[@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 😉.

[@fredsanchez311]

Hi I am a fan and watch your videos. I Do have a situation and hoping I get some direction. I have a question on 2004 suzuki that cranks but not start , and no comm issue and but have proper ground and power on pins 4,6 , and 16 on the DLC . Also ECU is not grounding the control wire on the fuel pum relay control wire, therefore no power on fuel pump. However, I noticed igintion fuse that power fuel pump also powers the ecu and the spark plugs, that wire if I cut it from the fuse now the cut wire stilled attached to ecu shows ground. with a light test This supposed to be power but shows ground when disconned from the fuse does this mean there is a short in the ECU? Also the ECU is not grounding the control wire for fuel pump relay as I said. Would you say the ECU is shorted? Thanks

[@brianburch8062]

This was HUGELY helpful! Thanks!

[@tonyb8137]

Paul, I just wanted to say that I enjoy your videos a lot. I have a quick question I wanted to run by you to see your thoughts. You talk about unplugging sensors one by one to find the faulted sensor. We know that sometimes these sensors can be a pain to find and disconnect. What would your thoughts be to take a 120v to 5v dc transformer like you use to charge your computers at home, unplug the ECM, TCM, whatever you are working on and use the wires out of the transformer to hook up to the 5V reference and sensor ground on the harness side. After you do this it will energize all 5V circuits. Then take your amp clamp on your meter and go to each 5v reference leg on the sensor and see what leg maxes out to whatever the mA rating is on the transformer is? Wouldn’t this show what sensor is shorting out without having to disconnect each sensor or without having to really open up each circuit? This will obviously put a load on the transformer and you wouldn’t be able to keep it plugged in very long. By using a small enough transformer though you wouldn’t risk overloading the conductors. Just curious on your thoughts.

[@ScannerDanner]

It would work but you still have to work at each leg of the sensor circuits. Not sure it would save much time. Especially with today's cars that all run separate reference wires back to the computer for each sensor. They are shared internally, but not externally like in the car in this video. Then some are using up to 4 different regulators now. 😉

[@caliman823]

Great video. Learned a lot and easy to understand.

[@georgebonney90]

Great fundamental lessons,thank u mr danner👍

[@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.

[@sammalaa3258]

thank you master danner I enjoy all your videos

[@ScannerDanner]

Glad you like them!

[@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.

[@nancylewis7142]

Thank you for this good video, Paul. I'm working on my 1989 Camry blown fuse problem, 2 months now and I can't find the wire.

[@sbignitionautomobilesb4661]

HI Nancy Lewis i think if you had the wiring diagramme you should be able to find it. good luck and have a nice day. By

[@ScannerDanner]

Intermittent problems are super difficult. Find out what all runs off of that circuit and then do a good visual inspection, especially on the areas of the harness where there is heat and vibration.

[@nancylewis7142]

@@ScannerDanner most likely inside the cab,? or engine compartment.? The DOME fuse covers, Antena motor, Radio, Clock, ECU, door warning light, all interior light, taillights. Thanks Paul.

[@ScannerDanner]

@@nancylewis7142 2 months ago is the last time it blew? And it's a daily driver? That won't be easy to reproduce. But yes, I'd look under the hood first. Visual inspections of everything near heat and look closely at where all the harnesses are rubbing. Also watch my Hummer case study with the shorted reference circuit for an idea. I had a main harness rubbing on a bolt! (I don't have the link offhand, it's one of my newer videos)

[@nancylewis7142]

@@ScannerDanner blew 2 months ago, I parked the vehicle and I start looking for the problem. No it's not the vehicle I'm driving, but my grandparents gave it to me, and I'm gonna use as a second car. For emergency only.

[@orangecrush50]

Where do you get your wiring diagrams from? I've Bern looking for a wiring diagram for my 2011 Dodge Ram 1500 4.7l. All I can find are diagrams for hemis. I've never had to work on electrical on cars, but this issue hs been driving me crazy

[@ScannerDanner]

This is the DIY version of the diagrams and service info I use. Same info, just access to one car. eautorepair.adtrk.biz/?a=10817&c=24&p=r&s1=

[@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

[@joseorellana7952]

Very good my friend..Saludos desde El Salvador

[@stevejakobsen2765]

Hmmm. Next time im running into a short on a 5v ref im gonna put a low amp clamp on it and see if i can call it that way. A short pulling the voltage down meens more current flows than what is suported by the circuit...

[@ScannerDanner]

That would be correct BUT, the computer systems are smart and will actually disable to 5v regulator (isolates it from the circuit) as soon as a short is sensed, so this method would prove to be frustrating on some models.

[@stevejakobsen2765]

@@ScannerDanner Ah. That is true. To fight that one would have to have the scope running to catch it when you turn the key on. You know, before it cuts out to protect itself

[@hill_customs6807]

I've got a 97 Cherokee crank but no start, dash doesn't work, no power to the OBD2 I probed power going into the ECM , 12 volts good.. tested the grounds zero ohms on the grounds for the ECM but the 5 volt out of the ECM do not have power is that a bad ecm? Or do I need further diagnostic?

[@ScannerDanner]

there is more than one 12v supply on the ecm, you will have at least one wire that is hot all the time and then another that is ignition power. Also the ohm test for the grounds is NOT a good test. Here is why kzbin.info/www/bejne/g5TWf4KAq8ljl9E Also, the fact that your dash doesn't work either is telling you, that you have another issue You will need some good wiring diagrams eautorepair.adtrk.biz/?a=10817&c=24&p=r&s1=

[@NoWr2Run]

Love the series sir, I was wondering if you personally have a vid. on how to use a volt meter correctly ? Thanks.

[@ScannerDanner]

Yes I have, watch this one first kzbin.info/www/bejne/rWGzoX-Ko7B-kMk