Intermittent stall, no start - P0320, P1391 cam, crank sensor testing (Jeep)

Join me and one of my students at RTC as we troubleshoot an intermittent no start problem on a Jeep Grand Cherokee. The procedures shown in this video apply to all Chrysler, Dodge and Jeep electrical systems. In particular, the cam and crank sensor tests that we show.

Symptoms
- intermittent no start, no spark or injector pulse
- check engine light on P0320, P1391 trouble codes
- hesitation and surging

Fix
- replace faulty crank sensor

Tests shown
- how to test for cam and crank signals on scan data
- what scan data Ignition Cycles can be used for
- how to test the cam and crank sensors with a scope
- how sample rate of a scope affects the signal
- why a sensor ground is better to use than battery ground in some circumstances
- how to recreate an intermittent problem
- sensor power and ground tests

Engine Performance Diagnostics chapter 21

Playlist
- (Chapter 21) Ignition inputs, cam and crank sensors

Related videos
- Picoscope Basics Part 1
- Picoscope Basics Part 2
- How to test a crank sensor (Chrysler Dodge Jeep)
- Jeep 4.7 no start from faulty cam sensor (an SD Premium video)
- Faulty cam sensor setting a crank sensor code - P1389, P0320, P0622

On ScannerDanner Premium I will bring you right into my classroom at Rosedale Technical College. You will find page for page lectures taken right from my book as well as exclusive classroom type case studies. What is so special about these classroom case studies? I pull live problem vehicles directly into my classroom and we troubleshoot them in real time, using and applying the theory and testing procedures we learn during the classroom lectures. There is no better on-line training of how to troubleshoot automotive electrical and electronics systems anywhere!

Disclaimer:
Due to factors beyond the control of ScannerDanner LLC, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. ScannerDanner LLC assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. ScannerDanner LLC recommends safe practices when working with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this video. Due to factors beyond the control of ScannerDanner LLC, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained in this video is the sole responsibility of the user and not ScannerDanner LLC.

[b.carroll]

I can't tell you enough how much I have learned from you. When I first met you, I thought I knew how to do pretty much everything I needed to know about auto repairs. I never even thought about engine performance issues and how to properly diag a check engine light. you took me under your wing and everyday after school I would go to all of the shops that couldn't figure out their issues. I did not do it for money. I did it to further my automotive knowledge. I did this all on my own time. You have taught me more after class than I learned from all the other teachers taught me at school. The passion that you have for this field is what made me want to keep learning and bettering myself. You were there at my graduation from RTI and at my Wedding. Words can not express how thankful I am for all that you have done for me. Thank you for everything you have done for me. Keep on making these videos and I'll keep on watching.

Brandon Carroll

[johnchristopherson]

Dude you're a freaking rock star, without a doubt you are the best instructor on you tube, oh hell for that matter probably one of the best instructors I've watched anywhere, and I have watched several in real life, and on you tube, and as a former Technician/Instructor for over 30 years I know a good one when I see one.
Thanks for sharing your knowledge.

[snsm]

THANK YOU for taking time to post videos like this as many of us drive these vehicles and
being able to have an understanding of this issue is important if you are on a budget like
many of us are !!

[roadkill]

Oh my! You guys had me rolling! Shane floating an air biscuit! Paul actually having a live being to talk to! Dean had Jerry, Costello had Abbott, now ScanneDanner has Shane the crop duster!! PRICELESS!! Great video, guys! And on top of it all, I still learned from the instructive parts of this vid! Thanks for a great show.

[zyadkhalid]

The last part of the video makes me to love you more than before when you said to the guy that don’t call you Mr. Danner
Thank you for the detailed explanation

[int]

Great team! Never knew Paul had a sense of humor until now. $! is on it's way.

[trainer]

Good to see you still bring your students along Paul, that's the best learning experience by far. Since I've been teaching we have hired one of my former students which is great and I share everything I can with him. Plus at my Full Time job we are bringing in another intern who is also a former student of mine. It has been pretty rewarding Paul watch my former students improve as they progress in their career. You were one of the contributing factors Paul why I became a instructor. My thought about it at the time was if you can take the time to help the next generation of Techs why can't I?

[mikechiodetti]

You guys are comedy relief! Or gas you caught the intermittent when it failed, PROVING the crank the sensor GROUND is bad! FANTASTIC!
OR, as I used to say at my previous work place when I caught the problem with the scope, meter, or GOTCHA ! ! ! THAT'S what makes a Great Video!

[todayintheshopbanksy]

'Crop dusted' is a new to me, classic.

[CRAZY_VIDS]

Student ID agreeing to everything but body language saying I'm totally lost...lol😂😂😂

[rockynix]

Using my magnifier glass helps see things a lot better when watching on my phone... Nice to see every little detail...

[martinguitarhd]

Excellent as always Paul.Crop dusting lol never heard that saying before.You are a very funny guy and it's good to see the humour with your students.I don't think taking along a student detracts from your teaching !! it's good to see a true master at work.you are the best.Any one reading this if you have not joined Pauls class on his premium channel you are missing out big time.

[jimbuford]

Good to see a young man that is serious about his training.

[ziyadalshaham]

Mr Paul danner you are a great master thank you, my wish in my life to be one of your students

[mobilemechman]

I myself didn't find Shane distracting at all. Great video as always. Thanks!

[nestrac]

Just keep bringing Shane or other students along... It alright

[xerxes]

Nice when you bring your students with you and it is cool they take the school serious, when I was in school many just went to school because they did not now what else to do. Nice video and many helpful tips.

[josephtucci]

Great vid      Keep Shane around makes for a great contrast Best of luck Paul

[sammoore]

You crop dusted me lol made me laugh.Paul i too like the vids with the students present, ,But then again i love all your vids.Best teacher by a mile !!Anyone on here not part of Paul's class, do your self a favour and join the premium channel !! you will not be dissapointed .

[janregheton]

This is the third night in a row when 2am catches me on this channel. As a DIY-er and a hobby-ist it doesn't make sense for me to subscribe to the premium. I don't think I could ever apply above 20% of that info on my personal car but I would gladly pay that 1$/month for the effort you put in this content. So the idea at the end of this video was not that bad.