How to test a crank sensor with a voltmeter

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The tests shown in this video apply to camshaft, crankshaft and vehicle speed sensors on ALL Chrysler models, in all production years. The vehicle being tested is a 1997 Jeep with a 4.0L engine.
Chrysler has changed very little in regards to their hall effect sensors throughout the years. Older systems used an 8-9v reference circuit (power supply), where the newer systems use 5v. And with all of them, the signal circuit is a 5v pull-down design.
Engine Performance Diagnostics chapter 21 pages 20-29
Tests shown
how to check a crank sensor with a voltmeter
-what does an on/off digital signal look like on a voltmeter
how to check the 5v reference and ground to the sensor
how to perform a bypass test
how to verify signal circuit integrity
Tools used
digital multimeter
jumper wire
backprobing pins
incandescent test light
scan tool
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Playlist
(Chapter 21) Ignition inputs, cam and crank
• (Chapter 21) Ignition ...
For more information on this topic, I have written a “field manual” called Engine Performance Diagnostics which is available at www.scannerdanner.com as an eBook or paper book.
Want even more diagnostic training? Whether you are a DIY trying to fix your own car, someone looking to become an auto technician, or a current auto technician that wants to get more into diagnostics, subscribe to ScannerDanner Premium www.scannerdan... There is a 14 day free trial.
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.

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15 окт 2024

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Комментарии : 324

@geraldmartin3625 5 лет назад

My friend has been mentioning problems with his sebring all of which are consistent with your chrysler, dodge, mitsubisbi 2.5 knocking, pinging and stalling vid from a few weeks ago. He has had 3 mechanics look at it and give up because there are no DTCs. The hour long video changed my directional mindset, I was going to look for a no com and go from there. I dont have a scope, just a simple handheld scanner with live data capabilities. This vid is exactly what I needed to confirm circuit integrity with a dvom. You Sir are very much appreciated, thank you for your time and effort!

@joefernandez9522 Год назад

1111111¹q1

@404notfound..... 3 года назад

You & south main auto are the top channels for automotive diagnostic services. 👍🥇

@CycloneCyd 5 лет назад

This video is awesome, man. It's so hard to find a Technician who REALLY knows his (her) onions like this that I wouldn't trust most to service a walking stick. I've done a video showing the DIYer how to get a good indication if the CKp is kaput and was thinking about doing something a little more comprehensive with a voltmeter, but instead I might just share this, it;s so good.

@bravobullz7475 3 года назад

Came across scannerdanner because of a misfire problem I was having and between 2 “professional” shops and $800 later still had a misfire so I took matters into my own hands I was told that my coil packs were fine Well they were not New coils problem gone I can not thank the RU-vid community and scannerdanner enough for making the content they do Now I just want to learn it all So my family friends and I will never get robbed by another mechanic 👨🏻‍🔧

@yanfishtwig2356 4 месяца назад

Indeed brother

@Caradonia 8 лет назад

I just did a primary chain and balance shaft chain on a 2.2 GM Ecotec engine. When I first tried to start the car it wouldn't run too well. Got a P0340 code. I was thinking I made a mistake and missed a tooth on reassembly. Turns out I actually had a shorted cam sensor. I followed this exact process using my scope. 0.71v plugged in and 5v unplugged. No square wave during a crank. Powers and grounds were under good under load. I love this channel and the premium one. Great information as always.

@1drivingfast 6 лет назад

It's rare to find a mechanic that knows their sh#t. I'm working on my families now. Bravo sir.

@dudemnky101 2 года назад

shit how many families you got

@keithnoneya 2 года назад

Did this on my 2003 Dakota and got not ASD Relay activation. It had the 5vdc like you did, both the feed and the PCM return or signal line. All the wires ohm out and I tried the ground pulsing on the PCM feed line and the ASD still didn't activate. The ASD ines all check good to the PCM and the Fuse panel, fuse good tool. I also have a NO BUS on the Instrument panel, 920 and 921 codes pop as well. My only conclusion at this point is the PCM must be bad. I reconnected the CKP and ran an oscope on the CKP to PCM feed line, and no pulses came out of the connector, so I probably have a dual problem, PCM and CKP. Thanks for sharing, I enjoyed the instruction. Best Wishes & Blessings. Keith Noneya

@Seal00754 9 лет назад

I am a ex Royal Automobile Club Patrol (Auto Club) I'd just like to say that this video although to some very technical, would save you money in the long run. So many forums online talk a load of BS and at last I have seen someone without greed, show a way forward. The USA is a big place and dealerships can be only on the coast states. Well done. If you find a old Bosch Distributor with the hall effect, you can show the "window" clearly. But basically it's a gap within the "magnetic field that switches the transistor to ground". Nearly all circuits are ground switched as the 5 volts is used as a stable voltage opposed to the 12 volts. Which does vary with the starter engaged.

@rikkimalloy9266 3 года назад

Brother you are Bad Mr. I just love your style. In my opinion you are a automotive technician. Mr. Brother Man: I hard core salute You.in my younger years I’d love to be on your team. You spoke clear, you explained clear and I know confidence and ability in an individual soul stay blessed and keep on pushing. And thank you

@battlehrfred 4 года назад

Finally, someone explaining how the 3 pin crank sensor "in detail" ty so much for explanation on the diagnosis ,including the 5 volt rule and solenoid checks!!100-100

@kman-mi7su 5 лет назад

So I'm working on a 2000 Dodge Ram 1500 5.2 engine. I'm a DIYer and I just did the sensor ground test like yours. In your test before cranking the engine and the DVOM hooked up, it read .009 millivolts, mine read .018, double that. I that normal for the truck? Wiring is my weak point, but thanks to you and a few others I've learned a thing or two and want to learn more. I acquired this truck free after the owner got fed up and let it go after it was stolen and recovered. I had to replace the ignition after it was punched by the thieves. It has a crank no start issue, It also had a "no bus" issue so I replaced the computer and solved that. Trying to get this beater running so I can use it as a cheap household projects truck. Keep up the great work you are doing by educating us.

@ScannerDanner 5 лет назад

.1 (100mv) or less is the standard for sensor and computer grounds. Your .018 = 18mv and is totally fine

@kman-mi7su 5 лет назад

@@ScannerDanner Thanks, I only got to that point, then it started raining. Working in my driveway so I'm at the mercy of the weather. Rain today and tomorrow but thanks. Like I said keep up the good work I'm getting an education from your videos and I'm sure others are too.

@felplayvina 12 лет назад

TPS and MAP sensor 5 v supply are okay but today my van won't start it, checked fuses and relay good, I jumped pin 30 to 87 the starter worked. thank you for your replay Paul I really appreciate. I will replace the pcm, and see if that it fix..

@nilorodel9278 8 лет назад

I followed your instructions and i found out my computer does not communicate,i open my computer and i check it and found you're right,the computer is the culprit,and then i search you tube about PCM why they fail,one reason (of so many i guess)is the capacitor,so i tried,i changed the three capacitor inside,now my jeep runs well,i hope it helps.

@ScannerDanner 12 лет назад

You can use a test light, most pull-up hall effects are 12v anyway. Even if it was 5v you can still use a test light with no harm.

@ScannerDanner 12 лет назад

What is the feed wire voltage? Do you have a steady 9 volts? If so check either the TPS or the MAP and let me know if one of the wires is reading 5v there.

@bobdelaplage690 3 года назад

Very informative brother! I check my no spark on my old volvo morrow, by doing exact these tests, its a 1992 and the sensor is on a hot spot on flywheel behind motor, may well be 30 years old and 250 ooomiles heatcycles...i do the diagnostics first, before trhrowing the other in, its rewarding to understand how they work / stop working, and the obvious tests to isolate the problem, great thx from Belgium Europe🇧🇪🍺

@ShiversRSS 12 лет назад

I love all of your videos and I am having a crank sensor problem with my dad's jeep. This helped me out a bunch! I would like to suggest you add some tags to this video so that it's more easily searched in RU-vid. Thanks again for the great video.

@ScannerDanner 11 лет назад

on the older ones they used an 8-9v power feed to the hall effects. either way I don't like 7v. double check that again and make sure your meter has a good ground and also give me the exact number. (example 7.99V is a lot better than 7.23) you should be closer to 9 v on your system in the feed circuit only. The signal is still a 5 v pull down design (sensor unplugged you should read 5)

@BlueStar712 3 года назад

Thank You for this info. Very good .

@ScannerDanner 12 лет назад

Before you do that make sure the signal wire to the CKP sensor is not shorted to ground.

@hustlerforgita7538 4 года назад

Great video for someone who doesn't have a scope thank for your labor and explanation

@ScannerDanner 12 лет назад

@ShiversRSS any particular tags you would recommend? i did put some in but could definitely use some suggestions

@nickoglock 10 лет назад

Another good video. I used this bypass test today on a 97 Jeep Wrangler 4.0 I ended up having a bad cam sensor which it was in the distributor The good part was the one I got from the part store was bad as well LOL It would've really thrown a normal parts changer around the bend I'm sure But since I had done the bypass test I knew that I had a bad sensor

@elboregojhb 2 года назад

Pick-up

@felplayvina 12 лет назад

just a question Paul as I see .378v without the key in, on the crk signal wire I thinking to replace the pcm. also did the by pass test and hear nothing, any advise thank you.

@xevietthoviet9178 6 лет назад

I watch the video of the teacher, looking forward to the last day as a student I come from Vietnam

@mobmob5944 3 года назад

@Jamison Grotzinger i just hacked your ip adress server and the first reply to your comment and they are both from the same adress no im not gonna look thru your pics lol 🙄🤫

@felplayvina 12 лет назад

Hi Paul, a bad crank sensor only will do no signal right, but with the sensor plug in the 5V should be there or not? is the wire is good with the sensor unplug the 5V should bee there..

@ScannerDanner 11 лет назад

That is a good question David and I didn't notice that until I uploaded the video. I am not sure I can answer it. What I can say though is some inputs are not updated on scan data until there is an RPM signal. With me providing a false RPM input, this could be a factor. What I don't know is why the numbers would drop to zero.

@movingupautodiagnostics8645 8 лет назад

Hi Paul, since this is a 5v pull down hall effect sensor, it's easy to ground it with no danger by doing so but, is there a 5v pull up design? If so, I'm guessing that I can't use the test light from B+ since its 12v. Can I jump the 5v power feed to the signal wire to do this bypass testing??

@ScannerDanner 8 лет назад

No danger in grounding a 5v pull-down circuit, even with a jumper wire. I've never seen a 5v pull-up but if there was one, you could still use your test light and tap into the 5v ref circuit from another sensor.

@movingupautodiagnostics8645 8 лет назад

ScannerDanner got it, thanks.

@danpettis1675 6 лет назад

ScannerDanner hi Paul. I measured my 5v reference at 4.92v (No crank ,key on) is this close enough. I was told that the reference voltage is never perfect. And I should be fine.i basically wanted a second opinion thank you in advance

@ScannerDanner 13 лет назад

@ExoVCDS I try my best to keep everyone engaged, sometimes it's just not possible. It is disheartening sometimes. Thanks for your comment though, it made me laugh. :)

@israelzunigamascorro9300 7 лет назад

excellent information Mr Paul. I have learned a lot of tips with your videos. Thank you for sharing your knowledge with us. God bless your family and you too. greetings fron Tamaulipas Mexico. sorry for my Englis writing.

@ScannerDanner 7 лет назад

Your English is fine my friend. God bless you too

@danpettis1675 6 лет назад

ScannerDanner hi Paul my supply voltage tested 4.92.i haven't tested with key on to see if my voltage dropped. Does it have to be exactly 5v .or is this close enough? Thanks in advance

@ScannerDanner 6 лет назад

No problem at all at 4.92 v I've seen them as low as 4.7

@danpettis1675 6 лет назад

ScannerDanner thank you so much sir

@danpettis1675 6 лет назад

ScannerDanner is a cam sensor test the same?

@ScannerDanner 12 лет назад

I believe the PCM is behind the passenger kick panel right? If so take a look at the connectors and make sure they are not corroded. I had a 96 with a windshield leak right onto the computer and caused to crazy stuff. BTW we are in Pittsburgh PA if your close we would love to help.

@hddm3 12 лет назад

man wish you were closer. i would take your classes for sure.

@ScannerDanner 12 лет назад

Is that with the sensor unplugged?

@felplayvina 12 лет назад

yes it is unplugged, I thinking to cut the wire from the pcm just to see if the voltage disappear, because it connect to tcm also.

@frankfrancisfrancis4919 4 года назад

This video is very very clear and simple to understand

@rikkimalloy9266 3 года назад

Also is it possible for you to show and explain the wiring diagram for a 2006 Dodge charger 2.7

@athiam152 2 года назад

How about if a crankshaft sensor reads 8V on the CKP sensor and Car battery is at 11.9V ? What should I do? Car is 2006 Honda Accord Euro CL9

@pupuffpass 2 года назад

Awesome explanation love the video. I have a question about an issue I'm having. Testing both power and signal wires without the sensors plugged in should read 5 v right. Well when I do the bypass test the cam reacts like it should but the crank reacts to both signal and power wires tripping the relays on both wires but what's weird is that aren't they connected together with one power feed feeding both sensors. Or actually the speed sensor as well right? So if the wires were touching then wouldn't it have the same affect on the other sensor wire harness or does the signals relay back to the ECU separately

@ScannerDanner 2 года назад

So with your bypass test, you are jumping those circuits to ground? You shouldn't do that to the reference circuit.

@drm42 10 месяцев назад

Amazing video, super detailed. Thanks so much for sharing!

@fortunerecords8154 3 года назад

Thanks for this. I had similar issue but on probing the reference voltage with sensor pulled out, 5v appeared on both signal and supply. The ground was fine. What could be wrong?

@josephlbrociousjr3951 Год назад

The most important part I needed to see,,,,,,,, Kinda difficult to show you that.

@ScannerDanner Год назад

Anything I can help clarify?

@MaicSalazarDiagnostics 10 лет назад

Paul, I have notice that in the last part of this video when you are doing the bypass, every time you touch the sensor signal wire with the test light to ground the IAT(V) and the COOLANT(V) goes to CERO! It is exactly at 14:50 on the video. Why is that?

@EdirtySicks 12 лет назад

Thanks for the offer! I am in SoCal though. BUT if you watch my last video, you can see me find the short after hours of being stranded on the side of the road last night. I needed light and couldnt see the angle at the harness i was testing, so my cell camera screen and light worked out perfectly. ;-) Thank you again for all the videos you post!

@dubblyewjay1133 2 года назад

Is it a coincidence or does the tach fail to indicate if the crankshaft position sensor fails? I have a 2001 Dodge Ram 1500 4x4.

@ScannerDanner 2 года назад

Tach movement is a guide only

@dunaweezel 3 месяца назад

What if the 5 and 0 volts alternate every couple times wave the wrench in front of the sensor? So when I'd pull the wrench away it would stay at 0 (well .3) volts. Tap it a couple more times it would stay at 5 when I pulled the wrench away. It keeps alternating "polarity" The cam sensor does the same thing. Is this normal? Great video thank you.

@ScannerDanner 3 месяца назад

Not at all. What problems are you having?

@Z_732 4 года назад

I'm a little lost on mine.. i did the remote wire test. Key on engine off. Positive to remote wire, negative to the battery -.. it showed 5 volts. I bumped the started a couple times to double check. Same result. What am I missing here? If you don't mind. (Yes the power side also showed 5 volts)

@stargazer9172 3 года назад

Love your channel. Mechanic from San Antonio , Texas

@Ukiyoez 5 лет назад

I have a 1999 suburban C1500 5.7L. Crank Position connector disconnected. Is ground supposed to disconnect when ignition is on? Ground is there when ignition is off.

@nickayivor8432 2 года назад

SUBSTANTIAL Sir ScannerDanner Thank you👍 Sir ScannerDanner From Nick Ayivor from London England UK 🇬🇧

@billnatan536 4 года назад

You are a brilliant teacher.

@ScannerDanner 4 года назад

Thank you Bill!

@summitsvift Год назад

I have 5 volts in negative cable on crank sensor in LS2, checked the ecu and its negative. Can it be bad sensor ? Car just stopped and doesn't start again. I check all loom and all sensors

@ScannerDanner Год назад

You have 5v on a sensor ground? Check that same wire at the computer connector next

@pigeonsil240sx 2 года назад

hey paul would it be more accurate if i put a rachet on crank pully and slow turn crank by hand since meter cant keep up with crank? then just look for the 0-5v change? (depending on if its a 5v signal that is)

@donalddeanemcsemasterasecp1615 7 лет назад

Danner It is Funny How Those CPS Always Go Bad On A Jeep I Just Fixed One The 2 dealers Said No CPS And 2 Shops i Found It 98 L6 In The Side Of The Bell Housing 1 Bolt I Tested It.Was Deader Then A doornail Lol Changed It Runs like A Champ !! Good To See Some Of Your videos Are Still Here !!! I Send All My Do It Them Selfers To You !! I Owe You And Your Son a Big Dinner !! Always Following You,Best

@2001BornAgain 3 года назад

How do you test brand new one before installing it? I wish you had one with a bad ckp and you tested the new one before putting it back in. My new ckp doesn't have any magnetism, but the old one does. So I am wondering if it is even any good. Any ideas?

@JRLSB 8 лет назад

Im confused im looking at a wire diagram for this and the red wire says 5v supply and the black /white says signal but u keep says the red wire is signal so is the wiring diagram wrong? when u diconect the plugg from the sensor then it reads 5v constantly so when u ground it with jumper ur acting like sensor and comolete the circuit.

@todds7614 4 года назад

im only getting 2.7 volts max and it does goto 0 when nicking the key . think it could be a bad ground somewhere or bad ecm output voltage ? all power to ecm and fuses same as battery volts 12.5

@ScannerDanner 4 года назад

what does the signal wire read with the sensor unplugged? It should be very near 5v

@r.weaver3769 2 года назад

I chased a fishbite miss forever on my 04 jeep. then one day started jumping and jerking especially on takeoff. as I was hooking scope to crank sensor, I moved heater hoses for better access, and found engine ground loose on engine stud. cleaned and tightened. jerking gone, as well as fishbite. Signal looked good. must get longer leads for testing while driving tho.

@ScannerDanner 13 лет назад

@DEFiANCE665 V8 Jeep is all I remember, same test on all Chrysler Hall Effects though, other than the signature of the waveform

@TylerrFTW 4 года назад

I did this test on my 2004 Jeep Grand Cherokee and the voltage randomly bounced around from 5.3-5.4V to below 3.9V on the power wire (red wire) does this mean the crank sensor is bad?

@ScannerDanner 4 года назад

bump the key like I did to see if it will pull down to zero

@TylerrFTW 4 года назад

ScannerDanner I bumped it for about a minute or so (probably 20+ times) and never got a reading higher than 0.9V on the signal wire from the crank sensor. On the power wire (red wire) it’s 5.2V with the key in the on position but bounces between 5.4V and ~3.8V when cranking. Bad crank sensor or something else like bad PCM?

@ScannerDanner 4 года назад

@@TylerrFTW the power wire should be a steady voltage but if you are using the block for the ground on your multimeter instead of battery negative, that can explain the lower voltage on the feed wire (block voltage from the starter can be as high as 1v or more on initial crank) On the signal wire, with the sensor disconnected, it should go to near 5v, does it? If so, it does sound like the sensor is messed up. You should have a crank sensor code too

@TylerrFTW 4 года назад

ScannerDanner ScannerDanner I’m using the negative battery terminal as ground. The signal wire with the sensor disconnected is right at 5.2V. The power wire with the sensor disconnected is also right at 5.2V. The only thing that’s weird is that there’s no engine code for it. Is it possible the sensor is bad without triggering a code? Thank you so much for your help, you’ve been a lifesaver and have earned a new sub 👍🏼

@ScannerDanner 4 года назад

@@TylerrFTW it is strange to me that you are not setting a code, but if you are sure that the signal wire is 0 all the time, plugged in, regardless of reluctor position, and you are reading 5v unplugged on the signal, then this confirms the circuit is working as designed and it does sound like the sensor is shorted. Remove the sensor and plug it in and move a heavy piece of metal past the end of it and see if you can make a signal

@kasman72 4 года назад

if you have a 12v ref voltage and it drops to around 11.2 during crank with a no start condition should i look to the starter?

@greygoosemafia 8 лет назад

I have the 99 ram. tons of intake issues. I was thinking about welding the hughes plenum fix plate to the intake. would that be dangerous?

@frontlinemedia4270 11 месяцев назад

So what if you have two pins with 4.9v when the key is on? Does that mean one wire is hitting the feed line?

@ScannerDanner 11 месяцев назад

There is a 5v pull-down type signal and a 5v reference. Completely normal to see that. The signal gets pulled low by the sensor as the trigger wheel spins

@frontlinemedia4270 11 месяцев назад

@@ScannerDanner how do I know what is the signal and what is the reference if I don't have a wire diagram?

@frontlinemedia4270 11 месяцев назад

@@ScannerDanner or even the ground for that matter?

@ScannerDanner 10 месяцев назад

@@frontlinemedia4270signal voltage will be slightly less than reference voltage. For example: Ref = 5.12v Signal= 5.09v

@ScannerDanner 10 месяцев назад

@@frontlinemedia4270sensor grounds should be less than 100mv You should join my classes! These are all really great questions www.scannerdanner.com/join-scannerdanner-premium.html

@rickchapman3707 9 лет назад

Thanks Paul just bought your book really needed to brush up on this topic

@ScannerDanner 9 лет назад

Rick Chapman thank you Rick!

@meengreen52 Год назад

Im getting 33ohm resistance on the ground. What gives 🤔

@jamessnipervlog7383 4 года назад

Very good instructor

@samwiggins5349 7 лет назад

thanks so much, i watch all your videos and you are teaching an old dog new tricks i have speed sensor problems on my isuzu trooper transfer case (TOD), i got to get under the truck, but i ain't buying a part i don't need

@mohanedmohamedahmed9603 3 года назад

if we could manually turn the fly wheel like when we do for leak down test . can we catch this at full scale ??

@felplayvina 12 лет назад

Hi Paul 98 vanager 3.0 still no spark, I been reading your book really good. I just follow your instruction all power to pcm and 9 and 5 V supply and ground are okay, this what I found cran sensor signal with key off .378V key on 68.0 MV speed sensor key off 00.7 MV key on 07.4 MV I just can't find the speed sensor location, little help please.

@brentbrown9728 7 лет назад

Would a sensor going bad cause power to be cut to a fuel pump? trying to trouble shoot a Dodge Stratus that won't start.

@TheCurtis0207 3 года назад

Hey I know this video is one of your older videos but was hoping you could let me know what it would mean if I was getting 300 millivolts on the ground wire while cranking

@TheCurtis0207 3 года назад

Correction I have 400 while cranking it’s a 1998 jeep tj 4.0

@ScannerDanner 3 года назад

On the ground wire, during cranking? I wouldn't be concerned with that.

@ronvonbargen8411 3 года назад

Just curious does the crank sensor pickup have the same number of windows as there are cylinders?

@ScannerDanner 3 года назад

No sir, not anymore.

@ronvonbargen8411 3 года назад

@@ScannerDanner thanks for reply.

@dcooper907 5 лет назад

need help 1993 dodge intrepid 3.3L engine cranks but won't start no spark failure to start test indicated bad camshaft sensor or wiring problem checked wiring connector to pcm all tested good installed new cps same problem tried testing procedure on new sensor power wire 8 volts cranking negative wire 1.25 cranking signal wire bump test highest voltage 5.0 lowest .063 is this telling me the new sensor is bad ? great video

@ScannerDanner 5 лет назад

No, the bump test showed you the signal voltage range is correct. It is a 0-5 volt on/off signal. I would verify that the timing belt has not jumped a few teeth next. Pull the top two covers off the cams and set the crank to TDC and check your marks. If I remember correctly, on this engine, you don't need to take much apart to take the top part of the two camshaft gear covers off.

@dcooper907 5 лет назад

Thanks for your help. my engine has a timing chain and one cam. just checked the crankshaft position sensor and it failed the bypass pull down test but i will check the timing thanks again

@ScannerDanner 5 лет назад

@@dcooper907 my fault, thought it was the overhead cam engine.

@dcooper907 5 лет назад

@@ScannerDanner that's ok i changed the crankshaft sensor engine started right up thanks for your help

@FahimMotoGP 6 лет назад

reading looks good on meter but my sensor still causes no start condition. I already replaced the sensor, can it be a faulty new sensor?

@waqasazmat81 3 года назад

Hi Paul, quick question. Since its a pull down design voltage appears as soon as sensor is unplugged. Question is if the signal wire was shorted to ground (external short) we would not see this 5v appearing with sensor unplugged. How do we then find out if it is a pull down or pull up design. I suppose we can check another hall effect sensor on the same vehicle or I guess depends on what the fault is stating regarding sensor signal.

@ScannerDanner 3 года назад

Great question! This information is not readily available, so if you didn't know, I teach to use a test light as your bypass tool, and then in your example you would connect it to battery positive and try to trigger the circuit, but the light would light up indicating a short to ground. On a pull-up design (which is what you would think with 0v unplugged), a test light to battery positive should NOT light the light. Hope that makes sense. If you're interested, this would be chapter 2 and chapter 21 material in my classes at www.scannerdanner.com Thank you!

@mototechno834 3 года назад

Hi Paul..today i tested crank sensor on a no start vehicle..the sensor had 3 wires..i checked the signal with picoscope and to my surprise, it produced sine wave with a sync notch...Paul, have u come across a three wire crank sensor that produces sine wave???? two wires had 2 volts each and third was ground...plzzzz suggest..Thank you..the car is hyundai verna 1.6 L CRDI

@ScannerDanner 3 года назад

Yes sir. It is a VRS with the third wire being a shield.

@mrexecutive1 12 лет назад

Is it possible to use the Hertz setting on the multimeter for cam/crank signal?

@randyanderson6110 5 лет назад

Would that test work with the Jeep 87-90 renix 4.0 as well. The renix sensors are 5 volts and hall effect.

@rudy6458 Год назад

Great video for a DIY

@garybacon7342 6 месяцев назад

looks like a 5.2 v8 like the one i have i have no spark or fuel pump working help thank you

@truthserum8326 3 года назад

Were do I find one of those nifty back testing pins used?

@ScannerDanner 3 года назад

walmart in the sewing/craft section or on my Amazon affiliate page

@nickhouck4309 5 лет назад

So you can kind of see the high and low of the frequency on multi meter. I know there is multi meters that read Hertz. There is also some multi meters that show digital square wave on scope function. I have had some intermittent timing fluctuations with cam crank codes that I could only detect with oscilloscope. If I'm trying to zoom into the slope would that be considered a digital analog signal? Or is it just a digital signal that is way slowed and zoomed in. I always assumed the digital signal is square. So what would my sloped signal be considered? Digital or analog? I'm just trying to figure out if a cheap scope will even do what I want. I dont think the time and zoom function would be the same as a good scope.

@ScannerDanner 5 лет назад

This would be the inexpensive scope you want. It is called a uScope and it is a single channel unit from my friends at AESwave www.aeswave.com/cart.php?m=affiliate_go&affiliateID=60df1b5cf6e5582af6ff81c728f42d0d&go=www.aeswave.com/uScope-Master-Kit-1-channel-automotive-scope-p9273.html

@eduardoenriquebarreto6269 9 месяцев назад

Hi Paul I subscribed to your channel and paid your membership I appreciate what your doing. I have an Ossy with a crankshaft sensors, I have to 2, one of them with the sensor out I apply 5V reference, ground and obtain 0.3v reference and when I approached an iron back and foward the signal goes from 0 to 0.3v And the other the same test but always have 3.9v no matter what Do you know of both sensor are bad? Thanks in advance

@ScannerDanner 9 месяцев назад

Need to know what the signal circuit design is. If it's a pull-down circuit, your not going to see a change in signal voltage the way you're bench testing that. With the key on, sensors unplugged, what is your signal wire voltage? Or, do the same test you're doing using the cars wiring instead

@eduardoenriquebarreto6269 9 месяцев назад

@@ScannerDanner ok 5V reference, 1 ground, return signal

@eduardoenriquebarreto6269 9 месяцев назад

@@ScannerDanner directly from ECM to the sensor

@ScannerDanner 9 месяцев назад

@@eduardoenriquebarreto6269 I asked what the voltage was on the signal wire with the sensor unplugged (key on). Follow my chapter 2 material on pull-up and pull-down signal circuits

@eduardoenriquebarreto6269 9 месяцев назад

⁠⁠@@ScannerDannerI will do it tomorrow morning and let you now I have a P115 code no speed engine signal detected on pin 17 of the engine harness and this pin correspond with the crankshaft sensor signal

@mavenraven1514 4 года назад

What does it mean when there is not 5 volts to ground

@ocesmekanics3831 4 года назад

What if I get 0.00 on ground? Do I look for a short?

@taz211lama 4 года назад

Not getting any reading 5v or battery volt from crankshaft wiring, getting the continuity

@payasito8132 4 года назад

I have a 2007 300 2.7 and a did this procedure to this car also to the cam sensor and i sill dont hv injector pulses no power from the computer to the injectr n wires are nut cut do you think my computer is bad ? 🤔

@ScannerDanner 4 года назад

Do you have spark?

@payasito8132 4 года назад

@@ScannerDanner yes before the car completely cut off i scanned it and it had 2 injector opened circuit and wen it broke down on the road i scanned it and had 6 code all injectore open circuit crank and cam sensor are good no broken wires from the fuse box to the injectors and from the injectors to the computer no it has a code u1414 looked for broken wires nathing all grounds are good i called a mecanic told him if he can test my ecm to see if its good so he came brought his snapon scanner said the ecm is good said every thing is working fine but cam and cran nat in reading dont remeber if he said nat in sync shold me his ready on the scope meter on bother just flat line as he was cranking it but like i said i check the wire going to the ecm signal from the crank and can are going in the ecm so he said no need to reflash it so month later still her with my broken car 🤔. Thank you scanner danner for taking the time to replying to me really like your videos 📹 very very helpful keep up the good job 👍.

@jamesbailey7785 6 лет назад

I realized I had rambled a book. Here is where I am in a kinda condensed cpl paragraphs. I have in my small arsenal a test light and a woods multi meter and a Haynes manual and a basic amount of smarts, for a old man. I was a Grinch this Xmas and took a gamble on a 1999 Dodge Durango 5.9l with no-start, no spark and a No Buss code. The couple I bought from said it had just quit on the previous owner at 179,000. They (couple) had a fuel pump installed and said it ran for about 600 miles and quit. He said he did some (testing) and concluded a bad crank sensor. Replaced and no start. He farted around and then replaced the Cam sensor with same results thus giving up and offered it for sale. He had however removed factory radio and installed some high tech thing and changed out lights for new high tech also. I have had good luck with most things I have tackled with the tremendous you tube help provides us back yard guys. Thus far following guidelines and I verified: I can hear the fuel pump relay kick when Plug/unplugging relay. Cheater way also switched with a neighboring one. I unscrewed cap and checked for fuel at fuel rail, which I do have however, no volt readings on fuel injectors. I also have no voltage reading at coil. Crk and Cam sensors - Unplugged test light to ground, I have 5v on power /reference wire and 5v between sensor grnd and power/ref wire. Key on- still unplugged I also have 5v on load/signal wire. Crk sensor plugged up back probed load/signal wire cranking it goes to 0v and stays - stop crank and it goes back to 5v. According to many that indicates a bad sensor which is possible as previous owner bought from Auto Zone (box and old sensor left in SUV). Have had and heard of many bad parts from them. But I’m not sure. Crk sensor unplugged Test light to ground I brush light prob across load/signal wire and for the first time I hear and feel the relay Labled ASD clicking. This one according to Haynes manual is the coil and fuel injector one. 2 things that questions me; It seems I have more than usual ark/sparking as I connect battery terminals. I ran into same thing while working on a neighbors riding mower and found the starter solenoid had lost a ground; Rusty connection. Next- is the No Buss affecting my test results? Watch many video’s to help guide me so much that my head is in spinning out of control forgetting and double checking overload. My testing has me thinking a ground issue but unsure which way next. I remember you with that AES tool that helped find the frayed wire kinda in wheel well. I know you said you had the scanner hooked up and when tried to duplicate had issues. I am at your mercy for a direction. Best; Tom

@ScannerDanner 6 лет назад

James, this one will be best handled on my forum. I can't do back and forth messages here as RU-vid's system sucks. They do not email me when there is a reply. My forum is free to join. www.scannerdanner.com/forum.html Thanks! Hope to see you there.

@hensennguyen Год назад

Ur great master. I will be study a lot :)

@dylandream2248 4 года назад

Will these tests apply to hall sensor on 92 Dodge B350? My friend replaced cap, rotor, SMEC and did have new hall sensor but took it out because it did no help and put old one back

@ScannerDanner 4 года назад

Absolutely! Same electrical design

@dylandream2248 4 года назад

ScannerDanner Thank you sir loved watching your videos! Very informative!!

@mohamedshinaishin2822 3 года назад

Mr. Paul can you please explain what's the relation between high amperage from the starter & rise of ground voltage?

@ScannerDanner 3 года назад

The engine block is the typical grounding point for the engine computer, as well as the starter motor itself. So when you're cranking, you a sending a mad amount of current flow into the block from the starter and the block itself will rise in voltage. It is this effect that will cause sensor and computer grounds to also show this rise in voltage. Make sense? The block is simply a conductor in the circuit.

@mohamedshinaishin2822 3 года назад

@@ScannerDanner got it thanks

@thealgerian4735 6 лет назад

great explanation. respect to what you re teaching here

@import0408 12 лет назад

Another good video. Wish I would've watched this yesterday had one in my bay today with a bad cam on a Chrysler could have used this to help.

@seanfancy9949 10 лет назад

Thank you for this video. one question are you saying that the Pcm Crankshaft position sensor line has an output of 5 volts from the Pcm?

@kennethdeneau7064 6 лет назад

this video provided the diagnostic procedure I needed. Saved much time & effort. Thanks.

@ScannerDanner 6 лет назад

Thanks for watching!

@danpettis1675 6 лет назад

ScannerDanner hi Paul followed your test to the letter. Everything looked great. Until I got to the sensor ground test .engine running kept flucuating between 14 and 26 millivolts. When I first started. (ASD removed) for a split second it spiked to 93 then would go down to 14... I didn't see anywhere near the readings you had on that chrysler.. bad ground maybe? Car does start and run .but keep getting the p0340 cam code. And has a stumble .And bucks and hesitation.. I've tried just about everything. It's a 06 jeep liberty thank you

@joshuagomez3600 2 года назад

Great video, thank you!

@ghazanfarsmith6608 8 лет назад

hi great video shouldnt that 5 volt turn to zero signal wire connected to ground.

@richgorsuch2667 4 года назад

Thank you very much for making this video!!!

@sivucit 12 лет назад

hi, this video is for pull down, ihowver n PULL UP sensor , can i use test light for signal to bypass the sensor to bring it to 12v but the problem is test light is 12v, how can i limit to 5 volt, ?. or even though test light is 12v, ECM will consider max as 5volt. please advise.

@gspotr69 6 лет назад

One quick question. Which side of the connector were you checking with the T-pin? The sensor side? or the harness side? I'm asking because I'm not sure about which side I should be checking during the bypass test. I'm guessing I should be plugged into the harness side. TIA

@ScannerDanner 6 лет назад

If it's plugged in, it doesn't really matter. Unplugged, doing a bypass test, you want to be on the harness side.

@gspotr69 6 лет назад

ScannerDanner Thanks... that makes sense.

@hansvarca3616 4 года назад

Is it ok to remove the crankshaft position sensor with socket connected and then use a wrench or anything metal thing and try to touch it on crankshaft position sensor ? And check the reading ? 😆

@ScannerDanner 4 года назад

Yes of course! I show that on a recent video I've done on a Jeep with a new cam sensor (maybe a year or so ago)

@hansvarca3616 4 года назад

@@ScannerDanner yeah mate i see that after i write a comment just scrolling and find that video before hahahah 😂 so smart

@willsloan223 7 лет назад

hopefully your still see this post. Ive got this exact Jeep. I have a nostart problem. i have power to everything and tested all sensors but im getting no pulse to the coil. i have coil power, crank sensor power, cam sensor power but no coil pulse. one thing is my input voltage is 8.9 volts. output is 5 volts on both cam sensor and crank sensor. Any ideas?

@ScannerDanner 7 лет назад

Chrysler used a 9v supply to the crank, cam and vehicle speed sensor on the older years For more help go here: It is becoming more and more difficult to answer questions here. I have 80,000 people asking me for help now. So I have created a forum to help you guys better. It is free to join and we can exchange pictures, wiring diagrams and waveforms if needed to help guide you through the process of troubleshooting your vehicle. Thank you so much! Hope to see you there. Paul Danner (ScannerDanner) www.scannerdanner.com/forum/post-your-repair-questions-here.html