Jeep 4.7 no start from faulty cam sensor (an SD Premium video)

แชร์
ฝัง
  • เผยแพร่เมื่อ 27 ม.ค. 2025

ความคิดเห็น • 86

  • @gregoryfairchild2460
    @gregoryfairchild2460 4 ปีที่แล้ว +2

    Block voltage and amperage, you bring up another teaching point.
    The effects of amperage on engine coolant.
    Acidification.
    Why you need to flush every couple years.
    Acidified coolant eats gakets and cheap sheet metal water pumps etc

  • @DJDevon3
    @DJDevon3 10 ปีที่แล้ว +10

    Just want to say that the more I learn about automotive repair the less interesting some of the other channels become because they are rehashing things I've already learned. Your channel on the other hand is a consistent supply of new knowledge.

    • @ScannerDanner
      @ScannerDanner  10 ปีที่แล้ว +3

      Wow that is a huge compliment. Thanks so much!

    • @tommyellis3956
      @tommyellis3956 4 ปีที่แล้ว

      This guy is wrong it's on left hand side top of transmission on a 6 cylinder 4.0 and dont unbolt motor mount no need it's do able

  • @stephenchristensen1393
    @stephenchristensen1393 7 ปีที่แล้ว +3

    This is quality. My auto repair experience is mostly mechanical and none of the electronic stuff that my 2001 Jeep GC has. It threw a P0320 this morning and I did a crank pos. sensor swap in the parking lot; now I am watching videos to see if I did the right thing. I stumbled onto your channel and like what I see, keep up the awesome work!

  • @nemanjadzombic6101
    @nemanjadzombic6101 6 ปีที่แล้ว +2

    Thank you for another perfect video!
    That visual explanation of how wigling the conector wake up a sensor is so cool. Also the fact that's sensor/component fault, not conector, is very valuable to anyone trying to repair their
    own or customer vehicle.
    Greetings from Serbia.

  • @JahanZeb1976
    @JahanZeb1976 10 ปีที่แล้ว +3

    Excellent lesson. This vehicle was very sensitive for Cam sensor signal. Great testing lesson for future testing. Regards,

  • @ozzstars_cars
    @ozzstars_cars 10 ปีที่แล้ว

    This was another fantastic video. Nothing beats a real world practical explanation

    • @ScannerDanner
      @ScannerDanner  10 ปีที่แล้ว +1

      Glad you liked it. Thanks!

  • @oldskoolfunk71
    @oldskoolfunk71 10 ปีที่แล้ว

    Great video Paul your content is off the hook and priceless. I actually blew a hole in the muffler before by mistiming a vehicle ( made it run to rich and blew a huge hole in the muffler, (very loud after lol) it really can happen peepz.

  • @rrmech11
    @rrmech11 10 ปีที่แล้ว

    Paul
    Great video as always
    I know that vehicle has a dis
    Ignition. But let ohter people know
    about the cam sensor in the distribitor
    And when changed you must do a
    Cam crank correlation adjustment by moving the distribitor to recommended 0 degrees. Love the
    premium channel and ebook.

  • @JF32304
    @JF32304 ปีที่แล้ว

    The crank sensor is right above the starter, rather easy to get to once you take 10 min and pull the starter. I should know, I've done it 3 times so far troubleshooting sensor issues haha. One thing I may have done to cause my issues is I pressure washed that exact area where the Cam sensor is, I mean I focused the nozzle right on the sensor lol. So, I am going to take that whole wire loom off here today and pull the wires out of the loom and make sure everything is dry as a bone as it was totally fine before I washed the unit. (I washed it because I had a leaking valve cover and it covered the side of the engine with oil and gunk. Wish me luck.

  • @hyperdukes7860
    @hyperdukes7860 ปีที่แล้ว

    Unfortunately the starter has to be moved in order to get to the crank sensor and half the time it'll break off into the block

  • @GRUPEROMORTAL
    @GRUPEROMORTAL 3 ปีที่แล้ว

    hello my friend today Saturday I was checking the crank sensor signal in the same jeep 4.7 engine , I had to jack it up go under neath remove the starter and key on check the wires , one gray had 5.1 volts , the middle one had ground and the other one had 5.1 volts with the sensor disconnected., put a new crank and still the jeep won't run, no fuel pressure, no injector pulse, no 12 volts to ignition coils, scanner light up because I have batt at pin 16 and ground at pins 4 and 5, but no com, , the tps also have 5 volts ref and 5 volts signal and ground sensor disconnected.. any idea why the jeep won't run? thank you.

  • @mrbadpliersstripbolt2696
    @mrbadpliersstripbolt2696 10 ปีที่แล้ว

    So, as a shortcut to checking this system with just the cam sensor code, would it not be prudent to just to do the pull down test and see if the injectors and ignition fires?

  • @Atacama777
    @Atacama777 10 ปีที่แล้ว

    Excellent as always, thanks.

  • @vincemoore6481
    @vincemoore6481 10 ปีที่แล้ว

    Dan: is the pcm shutting down because the senesor is shorting it out...I just had one of these with a crank sensor shorting the whole system with no scan data.

  • @jovango5425
    @jovango5425 7 ปีที่แล้ว +1

    how I can check cam and crank sensor with two terminal how i know if is faulthy give me and idea where the harness connected

    • @ScannerDanner
      @ScannerDanner  7 ปีที่แล้ว

      search variable reluctance sensor or VRS on my channel page. I have a hole bunch of 2 wire pickup type sensor testing videos. Thanks!

  • @02lowrider62
    @02lowrider62 10 ปีที่แล้ว

    Paul you need to get the extra long test leads for the verus ase wave sells them . I own a set and they work great. You can even do test drive with them !

    • @ScannerDanner
      @ScannerDanner  10 ปีที่แล้ว

      I definitely do! I'll be buying them for sure.

  • @litergy1
    @litergy1 5 ปีที่แล้ว

    Does the cam sensor actually control anything? I have a 2002 tj 4.0. The synchronizer was ticking so I replaced it. It runs fine, no codes. Should I bother taking it to get it synced

  • @LynxStarAuto
    @LynxStarAuto 10 ปีที่แล้ว

    Paul I think the loss of communication is a scan tool issue more than anything else. It's a known bug with the Snappy scanners...

  • @malisa696
    @malisa696 10 ปีที่แล้ว

    hello mister Paul. Can you tell what are those key chip for communication? Is that a standard for all OBD 2 system? Thank you in advance.

  • @wai2machine823
    @wai2machine823 10 ปีที่แล้ว

    Won't fire the injectors to start without a cam signal. Because it needs to know if its on intake or exaust stroke to start. If you spray it with starter fluid it will run without a cam signal. I assume the pcm figures out the cam position and doesn't need the signal anymore.

    • @ScannerDanner
      @ScannerDanner  10 ปีที่แล้ว

      That will not work with all systems. A waste spark ignition maybe, a cop system, not unless it resorts to pair firing the coils.

  • @chiefeaglebear2320
    @chiefeaglebear2320 9 ปีที่แล้ว

    ok hey hi scanner same engine different year its a swap into a dodge that had a 5.7 we got a no com first thing im thinking is check crk cam circuit integrity from this vid i see a no comm can be created from losing a cam crk signal MY QUESTION is being a bypass ign system would you want to also look at communication at ICM since during run its in charge of crank signal and ecm just monitors ???? i keep thinking bypass ign no signal somewhere but now im a little confused i thought you got a U code ONLY when a module that is critical is offline and communicating with module in charge which is ECM (meaning ecm is head module in charge) ??? thank you sir

  • @mototechno834
    @mototechno834 4 ปีที่แล้ว

    Hi Paul..with sensor plugged in, if we see zero volts at the sensor we say its a pull down design..suppose we are in a situation where the tooth of the gear is on the sensor or the tooth is close to the sensor this time and we see 5 volts, how will we know if its still a pull down design????

    • @ScannerDanner
      @ScannerDanner  4 ปีที่แล้ว

      Sensor unplugged is the key to circuit design. A pull-down will show high voltage, a pull-up will not. There are variables of course. Chapter 2 lectures on premium my friend. Are you a member? www.scannerdanner.com/join-scannerdanner-premium.html

  • @TheTrebor7577
    @TheTrebor7577 8 ปีที่แล้ว

    I'm having a similar issue with my 99 grand with the 4.7l. I had a short to ground in my cam sensor plug. Figured was my harness shorted to ground. Left my meter hooked up and started pulling plugs to pull harness. Short went away when I unplugged the MAF sensor. Replaced and ran no problem. Car sat for 4 months and same problem again. Fm

  • @gregoryfairchild2460
    @gregoryfairchild2460 4 ปีที่แล้ว

    Pin numbers are on the connector usually but hard to see

    • @gregoryfairchild2460
      @gregoryfairchild2460 4 ปีที่แล้ว

      Or it will have 1 and say 30 and you have to count pins

  • @graemetolton7699
    @graemetolton7699 8 ปีที่แล้ว

    The left side suspension didn't fall down because the sway bar was holding it up. When the ball joint was separated on the right, they would both fall.

  • @wai2machine823
    @wai2machine823 10 ปีที่แล้ว

    Just had an intermittent no start were the pcm was ignoring the cam signal. I replaced the connection at the pcm first to be sure. FYI don't open those ecm plugs. Omg what a nightmare.

  • @chiefeaglebear2320
    @chiefeaglebear2320 9 ปีที่แล้ว

    further on that engine it had a no comm when first swapped my buddy who owns vehicle had a dream that it was something in new digital read out in headliner that was swapped into the truck from other truck that had 4.7 in it (i know weird huh but he is a christian pastor too) that was put in -ok i figure the problem in headliner was something to do with a security module or something not communicating and as far as i know when you get a no com on a security module it will prevent vehicle from starting right? ok well he went out and fixed that and truck started running they gave truck a brand new paint job and then it quit working - i did notice a ground strap from block to frame that is missing now before i had seen it dangling on one side now i dont see a strap at all from engine to frame any help is greatly appreciated im trying to master this drivability thing thanks Sam

  • @yaseenhashim8538
    @yaseenhashim8538 4 ปีที่แล้ว

    thanks ScannerDanner

  • @gregoryfairchild2460
    @gregoryfairchild2460 4 ปีที่แล้ว

    Very good video

  • @villamarinajc4836
    @villamarinajc4836 10 ปีที่แล้ว

    Good stuff! I agree with one of the other comments about the test lead extensions from AES. They are worth every penny. Just like those acupuncture probes it looks like you are using.
    Do you think your communication problem could have been due to low cranking voltage? I noticed the cranking speed was getting pretty slow when the comm dropped out. Maybe the pcm quit working right while cranking due to low voltage. I've seen that before.
    I'm sure you've seen some cars that seem to crank ok but won't start because the voltage is near or below 9.6. PCM goes on strike.

  • @jesseruiz2337
    @jesseruiz2337 8 ปีที่แล้ว

    I have a 1997 Nissan pathfinder it's a crank but no start. it has spark, fuel psi is good injectors are working. the starter fuse is showing 0 volts and the fuse is fine not blown what direction would u suggest I take? also when I crank the speedometer tac does not move at all, I was thinking it's the crnk sensr but there is spark. your suggestion would be greatly appreciated!

    • @chriscowan6050
      @chriscowan6050 8 ปีที่แล้ว

      jessie ruiz if you have no tachometer when you crank and youn have spark ....remember the tach gets its signal somewhere from the primary circuit ...which indicates a good place to start ... and that is straight from a year 2 auto textbookm.. if no tach its fault is either pick up coil /crank sensor /igniton module or igniter/coil primary winding ///.....this vehicle being a 97 might be obd1 though som adjust accordingly based on the system

  • @emmanuelcruz6845
    @emmanuelcruz6845 6 ปีที่แล้ว

    I have the same problem. No start just crank what I found out so far it's my ASD relay making on and off whit ignition on rapidly. And no Injection pulse and no spark also find broken ground cable from engine to frame and broken ground cable from transmission to frame so u think I still have a bad cam after fixing the grounds?? Also I jump my ASD relay and it does run the car I thought was bad relay but I put another one and with ignition on it does the same ASD relay rapidly clicks and no star ,well it did start once and I thought was relay but I turned off and cracked and go back to no start. Any suggestion Mr. Danner!! I am working on 2000 grand Cherokee 4×4 4.7 thanks god bless.

    • @ScannerDanner
      @ScannerDanner  6 ปีที่แล้ว

      Post this to my forum Emmanuel. It is free to join and we can help you there. This one requires some research which I can't offer here. Thanks! Hope to see you on the forum.
      www.scannerdanner.com/forum.html

  • @taylorbutler5496
    @taylorbutler5496 6 ปีที่แล้ว

    Paul, I’m really stumped here. I’ve got a 2002 4.7 grand Cherokee with no RPM signal. And no cmp signal. Back probed the cmp signal and it’s all good. Per your info I won’t get a cmp signal without rpm. I can’t seem to figure out the RPM signal? Any help would be awesome! Ckp signal looks good also.

    • @ScannerDanner
      @ScannerDanner  6 ปีที่แล้ว

      What codes do you have? What is the history with this? I assume it is a no start

    • @taylorbutler5496
      @taylorbutler5496 6 ปีที่แล้ว

      ScannerDanner
      I had a ckp code. Replaced the sensor. Now no codes present. I got it with a bad engine, swapped the engine and drove it for about two months, then this code came up and it started shifting really crazy and hardly ran. I then got a cmp code, checked it via the computer not with a scope, had one so I threw it on and it ran great for about an hour. I proved the sensor and had good sign wave then probed the computer and had a good sign wave but nothing while watching the scanner. Assumed it was a bad computer so I replaced it with a reman from flagship one. Still nothing from the computer. Still have good signal from the cmp. Upon watching this video I learned that the computer won’t show a cmp signal without an rpm signal, well I don’t show an rpm signal, so that explains the no cmp signal. But what feed the computer with rpm if it’s not the ckp or cmp? Also checked map and tps and both scope out good. Per the specs I have on the Zeus. Thank you for your help!!

    • @taylorbutler5496
      @taylorbutler5496 6 ปีที่แล้ว

      Forgot to mention I did check the power and grounds at the Ecm and both 12v and 5v are good and grounds are good.

    • @taylorbutler5496
      @taylorbutler5496 6 ปีที่แล้ว +1

      Figured it out, the auto shut down relay had corroded contacts and It
      would intermittently drop voltage. It was super hot! Changed it and everything is working like it should.

  • @kengrabowski3911
    @kengrabowski3911 7 ปีที่แล้ว

    Is that a Hall effect sensor or variable reluctance?

  • @michaelszweda
    @michaelszweda 10 ปีที่แล้ว

    Great video Paul how much is your premium channel thanks Mike in florida

  • @philh9238
    @philh9238 10 ปีที่แล้ว

    so if one did not have a scope to see the signals could i use a test light to check the power and ground on a hall effect sensor harness with it still plugged in and check the signal wire with an ohmeter from pcm to sensor for opens and replace sensor if there isnt an open? just tryin to come up with another method

    • @ScannerDannerPremium
      @ScannerDannerPremium 10 ปีที่แล้ว

      No but you can use a voltmeter. I have a video on that. It's another jeep. I show the scope method then the voltmeter. A test light would not be good tool on a 5v circuit.

    • @philh9238
      @philh9238 10 ปีที่แล้ว

      makes sense. can you make a video sometime on finding short circuits an easy way. whats with everyone in the power probe 3?? thats all i hear about here in ohio

    • @ScannerDanner
      @ScannerDanner  10 ปีที่แล้ว

      I have one. Let me find it. It was on a buick Skylark I think.

    • @ScannerDanner
      @ScannerDanner  10 ปีที่แล้ว

      It is three parts. Here is part 2
      How to locate an intermittent short to ground (Mazda Miata case study part 2)

    • @philh9238
      @philh9238 10 ปีที่แล้ว

      is there anything you cant figure out on a car?! your a good tech? or teacher at your school! keep up the good work

  • @mahdijoumazadeh996
    @mahdijoumazadeh996 9 ปีที่แล้ว

    i have question .i got 99.2 in few car at long term ,why ? somthing is wrong

    • @ScannerDanner
      @ScannerDanner  9 ปีที่แล้ว

      +Mahdi Joumazadeh that's a downstream fuel trim number on a system that doesn't use downstream fuel trim. In other words, ignore it, there is no problem there

  • @TonyoTorres
    @TonyoTorres 7 ปีที่แล้ว

    don't you missing something?
    the position of the cam where is positioned at the time of the test

  • @rayestrella3771
    @rayestrella3771 5 ปีที่แล้ว

    very educational

  • @8power0
    @8power0 10 ปีที่แล้ว

    Using a sensor simulator on this jeep would have made for one very interesting video and would you speculate to say that this jeep might have ran , hopefully in the near future we all may see that , very good video and thank you vary much.

    • @ScannerDanner
      @ScannerDanner  10 ปีที่แล้ว

      It wouldn't have due to timing issues. No way to simulate the signals with the correct frequency and duty cycle. (Not an even signal)

    • @8power0
      @8power0 10 ปีที่แล้ว

      ScannerDanner Thanks for your speedy reply it goes to show you are very focused , just a thought is there such an automotive sensor simulator that does frequency and duty cycle that you know of and thanks again .

  • @ric2play
    @ric2play 10 ปีที่แล้ว

    Hey...I lost access to the ebook........help

    • @ScannerDanner
      @ScannerDanner  10 ปีที่แล้ว

      Just sent you an email ric, to get you back up and running.
      Let me know you received it. Thanks!

    • @ric2play
      @ric2play 10 ปีที่แล้ว

      Got it.......thnx

  • @ivansperanza
    @ivansperanza 10 ปีที่แล้ว +1

    4.7 engines were notorious for having shorted crank sensors that caused a no communication problem and no start complains.

  • @geraldozayas383
    @geraldozayas383 9 ปีที่แล้ว

    Hey Paul , 03 dodge ram 4.7 no start . p0335 crank sensor circuit fault. Customer installed new crank sensor and re manufactured pcm. Scoped the cam and crank at the computer and both signals look the exact same. Looks like a cam sensor signal on both the grey/black and tan/yellow wire at computer. Doesn't make any sense to me. Can both signal wired be touching each other somewhere In the harness? or a bad pcm? if you can give me any info I would appreciate it. thanks!

  • @wai2machine823
    @wai2machine823 10 ปีที่แล้ว

    Just scope the cam shaft sensor to test it.

    • @ScannerDanner
      @ScannerDanner  10 ปีที่แล้ว +1

      Isn't that what I did? Sorry for the explanation of circuit design and adding the variables. You didn't find it useful?

  • @khaniftikhar9225
    @khaniftikhar9225 4 ปีที่แล้ว

    Good

  • @fivefortyeye540i
    @fivefortyeye540i 10 ปีที่แล้ว

    @scannerdanner Paul! Man over at Schrodingers box channel.He has very interesting case study on his personal car.. Long story short his ltft is not responding with his scan tool.. 5pt series called, test your lean condition.. Man he's bright guy DIY.. But this case study has turned into spaghetti..

    • @YouTube.TOM.A
      @YouTube.TOM.A 10 ปีที่แล้ว

      Can I say this? There is a lot of good content on the internet and on this channel. I have found myself educated by many other presenter's case studies. I find it hard to put into words, what makes this channel and Paul Danner the best presentation on the web !. I have seen others explain the very same thing but a combination of Paul's teaching skills and delivery has me always returning to his content.

    • @ScannerDannerPremium
      @ScannerDannerPremium 10 ปีที่แล้ว

      Thanks Tom!

  • @srvjediknightsrv750
    @srvjediknightsrv750 10 ปีที่แล้ว +2

    that crank sensor is behind the pass tire well lol a real p.i.t.a

  • @1kleineMax1
    @1kleineMax1 10 ปีที่แล้ว

    -.- I cant subscribe to your premium channel even if i would like to, cause im from germany and youtube doesnt support the pay channels here. So thats why i hate this videos that leave with just one part of ... something

    • @ScannerDanner
      @ScannerDanner  10 ปีที่แล้ว

      1kleineMax1 I understand, and it should be available in your country soon. At least you told me why you don't like it, unlike most people who just thumbs down the video and say nothing. The rest of the series is me teaching through Section 2 of my book "switch inputs". So it does help to have this information, but it is not necessary to make this a good and useful video. Perspective is everything. I am providing you with a start to finish case study with great information for FREE! Yet you complain.

    • @1kleineMax1
      @1kleineMax1 10 ปีที่แล้ว

      ScannerDanner
      Yeah of course this for free and you make more then just only interessting videos, thats why i subscribed. But i just wanted to point out that it a little bummer when I see only the end of something where might be more.
      Also my comment sounded maybe more severer that it should be, it was just my feeling of missing ssomething, and i dont gave any thumbdown.

  • @wai2machine823
    @wai2machine823 10 ปีที่แล้ว

    Chrysler ecm's. Huuugh

  • @jesseruiz2337
    @jesseruiz2337 8 ปีที่แล้ว

    I have a 1997 Nissan pathfinder it's a crank but no start. it has spark, fuel psi is good injectors are working. the starter fuse is showing 0 volts and the fuse is fine not blown what direction would u suggest I take? also when I crank the speedometer tac does not move at all, I was thinking it's the crnk sensr but there is spark. your suggestion would be greatly appreciated!

  • @mototechno834
    @mototechno834 4 ปีที่แล้ว

    Hi Paul...i want to know that the mitchell wiring diagrams that you use, does this software include wiring diagrams for Indian cars???? Plzzzz advise me on this...thank you

    • @ScannerDanner
      @ScannerDanner  4 ปีที่แล้ว

      I dont think so my friend. Post this to my forum. www.scannerdanner.com
      It is free to join and I have an international community. I'm sure we can advise you on where to get service info.

    • @mototechno834
      @mototechno834 4 ปีที่แล้ว

      @@ScannerDanner Hi Paul..m willing to purchase your ebook..i am at the payment page..after making payment in how much time will i be able to access the book????

    • @ScannerDanner
      @ScannerDanner  4 ปีที่แล้ว

      @@mototechno834 indefinitely my friend, I keep every single eBook purchasers information and recover license codes all the time for buyers all the way back to 2012 when I first started producing it. If you have additional questions email me at support@scannerdanner.com
      I miss these messages here sometimes.
      Thank you!