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Excellent work Oz, I have been chasing a cam sensor fault on a 2001 twin turbo Subaru Legacy. I swapped out the sensor, checked and double-checked the wiring and so on. I was getting to the end of what I could check! scoped everything and hey-presto NOISE! That alternator seemed fine, was putting out a good charge and all but was causing interference. Changed the Alternator and the vehicle runs beautifully. Thank you so much for your great video.
Found this video as I am tackling a stubborn P0335 Code on a 2010 Honda Civic Hybrid (not my first choice in a car but as a ride share free lancer; it is my bread and butter) Replaced cam sensor (New OEM) and it’s back six months after the repair. Ocasional abnormal idle. Rpm activity will act up while driving and shifting gears. Lurches every now and again while driving. I appreciate this thorough and informative video. I am still scratching my head on what could be causing this code but it looks like I found myself a good channel to subscribe to in the process. Video notifications are turned on. Great video!
Good job Oz. Really appreciate your videos. From experience 120 mV AC to 250 mV AC seems to be the max allowed ripple depending on manufacturers. Usually outside this range you'll get sensor related codes just like this beauty you diagnosed. Even if no codes occur it's good to test AC ripple when newer batteries are testing bad. AC voltage is bad on batteries.
Billy Yoder thanks brother. Yea I’ve been waiting to get something like this. I’ve read about them but haven’t messed with one that would mess with the cam.
without his searching scope wouldn't solve it at all , scope is a good tool when a good reference is available which is not always the case , which proves that the scope is just a fancy tool but it's not necessary at all to have
amr hamed so how then would you pursue a flex ray network failure due to signal attenuation? It's not a fancy tool at all. It's quite basic . And if used properly is one of the greatest in any diagnosticians arsenal. Are there other ways ? In most cases yes , but certainly not all. A decent scope is under 100 dollars. A snap on ratchet used is the same price. Remember that we do not have the luxury of just repeatedly fitting parts to see if it's the failure. We only have a few hours and that customer must have their vehicle back. Where are you from if I may ask?
I had a similar issue with my 09 explorer 4.6,had a P0341 and it turned out it was the alternator problem,changed my alternator and the code disappeared buy itself .Thanks for your video bud
I have a 2004 F150 with the code p0340. Changed both of the sensors and check engine light lights up after a while. When the truck is in parking, it feels like a rough idle but once i put it in drive, theres no rough idle. What do u think?
Great Video Oz! I wouldn’t have guessed those small ripples on the cam signal would have such an effect, but when you changed your time scale you can see it clear as day. Thanks for sharing!
Thank you so much for the thorough research. This is related to the problem problem I am facing right now. I'll give it a try removing alternator cable or drive belt and see how my car will react to the changes.
Wow . thanks bro, from I install a new alternator I been getting that p0340 code, I change the cam sensor two times still no change , so it is the altinator, 1998 lincoln navigator. Thanks a lot back to AutoZone I go
Check engine came on and code P0340 cam position sensor. I replaced and check engine light still on. So I did another scan and code P0340 was coming up, suggesting that I check the plug of the sensor. It looked good. Watching your video alternator will be checked. Thanks for the info.
Had this problem with my mustang 12 years and no one had a clue what was wrong with it. I eventually found a clue on a crown vic forum and got the alternator rebuild. The guy thought I was crazy for thinking it would fix the cam sensor code
I'm having this problem right now on a ranger. I don't have the fancy tools and would not have found this. Thanks. I wonder, however, batteries are capacitors that are used to clean up noise on dc. Shouldn't the battery have cleaned up this problem? I wonder if there is more that is wrong here. Thanks.
When I first started down this path of learning about diagnostics, I was attempting to find a way a DIY'er could bypass using a scope and use common methods (cheap). But as I learn, I have also realized having a scope is required, or, you take it to a good shop.
I got a question. I just replaced my cam sensor (bank 1) on my Nissan Pathfinder 05 and the code is still coming up. What possibilities do you think it could be? Connector? Wiring? Defective part or maybe something else? Because my car starts fine and runs, just bugging that I can't find the root problem. Thanks for the video, gave me more insight!
Very good information I’m in the middle of an electrical problem but I never thought about the alternator causing all those issues with the campshaft thanks a lot very good video👍🏼
Man, bro i have a 09 Pontiac g6 , its throwing the cam position sensor . I changed the sensor , the car still acting up. The car runs fine but check engine light is on , what should I do ??? Please help!!!!!
Nice diag work bro' This one reminded me of a '94 Acura Vigor that would start misfiring around 2500 rpm. It was late in the evening, so I decided to bypass diag mode, & jump straight to iATN Fix Database mode, where I found one hit on this symptom, which turned out to be related to excessive diode ripple. So, I removed the connector from the regulator, & viola, symptom gone! New alternator fixed car. Thanks for another great diag vid.
Any oscilloscope should work here:a cheap chinese one aught to do just as well. The Snap-on one is just made with Automotive use in mind (and they're built like tanks). You may also be able to remove the alternator and take it to a shop to have it tested for this as well, which might be a cheaper option then taking in the whole car.
Had this problem with my 1984 Camaro. The choke light would flicker and the key buzzer would partially come on at certain speeds. It was the diode trio in the alternator had lost one diode function. Ac feedback caused the choke light to flicker. 7 dollar part.
I have a 2004 Nissan Frontier 4x4 3.3L V6. It all of the sudden would just not start. It threw the P0340 Code so naturally I had the County mechanic replace the distributor because that is where the Cam position sensor is; well, it still didn't fire after that. I saw another video that said this code could also be caused by the Crank position sensor, so i ordered one of those and it hasn't arrived yet. I also ordered a knock sensor because I also got that code a while back when I was having misfires and needed to replace spark plug 6. It is winter here in Northern MN and my truck is a long ways away from civilization parked in the snow. I really need some help with this one.
Did it have a rough idle/misfire as well? I have the same code all of a sudden. What else will throw a P3040 code on a 2007 3.0 Ranger? Tyia Also, I replaced the synchronizer and Sensor but that didnt help. My mechanic says it could be a valve issue but it happed suddenly. Will a CKP sensor throw the p3040 code and not the ckp code? Bad PCM/
Added information... the Radio suppression capacitors are found on the front of the engine. Those capacitors aren't for the "radio." Capacitors filter out noise just like what you saw on your scope. In other words they filter out radio frequency noise (RF noise). You might have fixed it with the alternator but I believe the better fix was with the capacitor... it only costs $8. Soon the new alternator might cause the same problem and you'll be in the same problem. Excellent video but go further just like you said and don't throw parts at your car. In fact might be able to clean the connections on the capacitor and it'll be free.
@@florenbaron7111 There's a good chance it does but often they are called something else. Noise filter, DC filter, Noise Reducer, etc. Inside it's usually just a capacitor.
Thank you so much I have problems with my cam sensor didn't know what was going on until I watch this video and told my personal mechanic and everything worked out right thank you
Loved it , excellent presentation ! I’m having similar problem with my 94 3.1 liter Olds Ciera , gone through 13 cam position sensors , very frustrating, especially if that’s not the problem , same trouble code here
I done my timing chain on astra h, as soon as you suspected the alternator, a bell rang in my head and I dont remember plugging this little connector back in. :/
I have this code on a 2012 Chrysler 200 I just picked up cheap. Has new cam and crank sensors and a new connector in the back. Connector tests 5v on one side and minimal on the other. Before the charred connector was changed it was reversed minimal on the othet one and 5v on the one now reading low if that makes sense. Could it be the alternator?
cool man! good job. I got a p0340 code on a Pacifica that will now not start...even after I replaced CPS. BUT!, you have given me another place to consider.
I got a 2000 Cadillac Deville DHS it has several codes and im now wondering if it all related to my alternator....putting out to much voltage??? Great video... got the 0340 and couple other electrical issues, hmmmmmm
Is the p0010 code for 2015 Hyundai Sonata sport 2.4L GDI problem really is what the scanner says it is or the problem somewhere else? also where exactly is the cam position intake solenoid located because where everyone is showing it’s not there on my vehicle. Let me know please
I have an 03 neon that dies when driving. Have codes for cam and crank sensors. Replaced them both and took timing cover off to check it. The timing looked good but I put in a new belt since I had that off. There has been no change it still does the same thing. Is there a way I can test the food of the alternator without the scanner?
I’m running into this issue on my 05 mustang GT I’ve replaced both cps and now the alternator I had to buy a remanufactured alternator and my ripple is .19v is that expected?
Heloo Oz..this is pretty awesome. i am using a Lexus RX300 v6 engine and i had both my Camshaft sensors changed including the Crankshaft sensor. Both the Camshaft sensors responded positively except the Crankshaft sensors which failed to reset. The code keeps on coming back. i also have this Whinnying sound which all along i have been thinking it comes from the Power Steering Pump. Any advice?
If the alternator is noisy and it's not from a failing diode, wouldn't it be cheaper to install a filter capacitor on the B+ (alternator current output) wire instead of R&R'ing the alternator? Or just live with the noise unless it's bleeding into the speakers and sound system? If my engine was running a bad idle AND the scan code was showing a 0340, then I would be 90% sure that the cam position sensor was bad and not worry about a noisy alternator provided it was still good enough to keep the battery charged at 13-14vdc.
Hi there Oz I have that problem with my 2004 nissan pathfinder I changed twice my camshaft sensor bank 2 cause I don't have that equipment that you have, so you think maybe is my alternator?
You think this would apply to a 2006 5.7 hemi on a 300c Chrysler? I’m having this issue, car starts right away when cold but when warmed up it struggles to turn on
So this alternator is putting out more voltage? I'm having a lot of problems on my 2015 Colorado.. wish theres was a good mechanic like you in town.. 😵💫🚛
Great diagnostic and shows why electronic problems can be tricky. I hope those who don't wrench on their cars appreciate why the mechanics they pay can't always solve every issue on a 1st pass. It appears the alternator output noise coupled into the analog ground of the engine controller (needs more filters), and also that perhaps Ford chose a too-low threshold for the VR signal from the camshaft sensor. Perhaps purposeful so it would still work as the sensor magnet aged or if installation distance was off, but also makes it touchy to any noise in the signal or controller.
@@darishopkins2573 No need to bet since he proved the alternator was the noise source. He disabled the alternator so the engine then ran off battery alone and the camshaft sensor signal became very clean. He also researched the problem for this specific model and found where others cured the sensor code issue by swapping in a rebuilt alternator. The camshaft sensor error code then disappeared, proving that the noise was the problem (thus was very relevant).
Hello sir I have a 2013 Hyundai Elantra it has a code P0016 it’s reading a camshaft correlation Bank 1 sensor A So I replace it and it’s still doing the same it starts rough and stalls When it warms up it runs a lot better any idea what I have to look for or do
My 2006 Mustang GT has codes P0345 and P0349. Both of my cam position sensors are new as well as my crank position sensor (Ford OEM).I just replaced the lash adjusters, cam followers, cams and all timing components (everything new). I am 99.9% sure that the timing is correct as I took my time with it and had the crank locked in position with the tool and had the chains lined up on the dot on the crank and the other end on the phasers in their correct places. It says I basically have a VCT solenoid stuck open or my timing is off and that my cam position sensor is bad. The car will start up and idle, but if you try to give it gas at all it backfires through the exhaust. I do not have this expensive scanner. Please help me out if you can. Thanks, Frank.
@@damianwayne5302 I found out that I had the aftermarket non OEM cam phasers on in the wrong orientation. Driver side "L" at 12 o'clock (on colored chain link) and passenger side "R" at 12 o'clock (on colored chain link). Once I found my issue and reset my timing chains and phasers I was good to go. The most common issues are a stuck VCT solenoid(s), bad alternator, bad timing/jumped timing.
So p0430 it’s a universal code across all obd2 scanners for all cars ? I have this same code p0430 but it says O2 sensor / catalytic converters problems on a gmc
That was great , my cam pos sensor is barely a year old. The body that the sensor rides on was changed about a year and a half ago. That damn p0340 pops up every month or so, truck runs good so I don’t think that it’s sensor. It’s gotta be the alt. Thank You for the Video.
Hey Oz I have a 2005 Subaru Legacy gt i have a cam sensor circuit code and i changed them both changed the oxy sensors had new coils an sparks done an a month later i got the cam code but it runs fine but when i go to slow down it either dies or has a rough idle. Not all the time does it do this though it is random. Most of the time when i crank up it has a moment or two the idle sounds rough an some times when i put it in drive or reverse it acts up but its random though so no consistent. Would that be the wiring harness to the sensors? being its a Subaru not the best wiring. Or would it be something else cause its not feeling a running like a bad cam sensor thank you for your time!!
@@OzMechanics As i understood from your video is that the alarm P0340 was actually generated due to high ripples generated from the alternator, so you disconnected it, my question was, did the Alarm P0340 was cleared after you disconnected the alternator?
@@waheebsayani4111 codes stay in the computer until they're removed (either leaving the battery unplugged for awhile, or using a code reader). Because of that, you can have a situation where you're not sure if a code is current or just a uncleared older issue.
Hey, so we have a 2v mustang that’s throwing the code, we took it to 2 shops and a Ford dealer and they couldn’t figure it out. We did like 3 alternators, 1 even failed on the highway on the way home. They changed the wiring also. The car even has new spark plugs from a shop. Is there any other reason it’s still throwing the code? Could it be a timing chain, the car never starts first try.
Thank you for the informational video. I got this code on my o3 civic lx 168000mi when I was going uphill on a dirt mountain road @ 35mph. The engine lost power and shutown and the p0340 came on. I cleared the code and was able to come home. Two weeks after it came back on but the engine didn't shut down. Three weeks later came back on again. I cleared it and hasn't come back since then. Checked the alternator and battery and they are good. What should I do? I also have a cat convert below threshold codes that comes and goes every now and then.
Hi OZ I have a 2006 dodge caravan and I have an issue with it I got an engine light on and it started to run rough tough to start and jerking at roughly 2500 rpm diagnosed both sensors and wires there perfectly fine can the alternator cause this ?
Greetings and thanks for the video. Is the camshaft position sensor located in this area as well (2006 Kia Optima)??? My car is running badly and cutting off after fueling and while driving. Could it be the camshaft?
@@OzMechanics Thanks for the info and response. I'll get a 2nd look and crazy thing is I already changed the CMP. Praying for an affordable solution 🙏🏾🤑
so i just recently replaced the spark plugs and coils on my dodge and after i put everything back and went ahead to turn on the car, the check engine light came on immediately and it threw multiple codes witch were the following... p0340,0365,p1dd2,u1424 any ideas as to why that might be??? i did disconnect the cam shaft position sensor at one point when i was replacing the spark plugs but i made sure to disconnect it very carefully and plugged it in right back afterwards, i would definitely appreciate any ideas you guys might have in regards to this situation
I also think that my transmission Governor solenoid sensor needs to be replaced as well because it won't shift into gear 3. Out here in Atlanta Georgia it seems like people at mechanic shops don't want to help me so I'm thinking of buying some tools and fixing the problem myself
2003 Honda Accord 4cyl. I got a check engine light P0341 that i need to clear. It sounds like a lawnmower when i start it and the RPM drops and dies out. I changed the spark plugs and coils with new ones and It cleared the 4 codes it had that were P0300, P0301, P0302, P0303, P0304 HELP?
Bro I got an 05 Sunfire. I've got ignition coil, module, crank shaft position sensor, and spark plugs replaced. I still got a check engine light on but it runs better. It was shaking really bad. It throws a cam shaft code but when I go to get the part its like it don't exist. I'm so confused and angry. What do I need to do .
I have 06 fusion 2.3l that is throwing a p0340 cam sensor code and had another cam sensor laying around so I swapped it and code still comes on. When driving it bogs down and won’t accelerate over 15 mph. Alternator don’t have a whine to it, could it still be an alternator??
Tyler Dixon would have to look at it with a scope. To see what the signal wire is doing on your crank sensor. Other than that it’s only a guessing game
Saved me time and money my xterra is doing the same thing. I’m seeing a spike in between the cam sensor trigger I’m going to test on alternator side just to verify the spike disappears. Appreciate your video. 👏🏽👏🏽
@@OzMechanics I have access to an oscilloscope so I could do the ripple test. I don't think they look at ripple....just do load testing to find the amperage/voltage in no load and under load. My Lexus threw the p0335, p0345, p0340 codes all at once and has weak starting after letting sit for a couple days now, so I'm guessing it's alternator/battery.
Thanks for the video, I got a problem where I have trouble to start hot engine on Citroen Jumper 2,2 hdi150 - I have changed many sensors and starter and no effect - I just might be that I got faulty alternator and that gives bad voltage specially when its driven hot. Alsoo I got the P0340 and P0016code. Cam and crank sensors have been replaced no effect so far Thanks for video - seems I need to try new alternator.
Good video I have a 2004 Mountaineer,I live in Illinois where I just failed the emission test one of the codes was this one P0340 and the other was P1336 from what I could look up one was the cam sensor the other the crankshaft position sensor do you think a bad diode could effect them both because the truck is running just fine,any suggestions
@@thomasbackovich3045 man good luck I ended up replacing the camshaft and crankshaft sensors that didn't changed the plugs a couple of bad coils and battery and alternator after the mechanic and other mechanics were saying put a engine in it it wasn't worth it so I got rid of it.... I hate it too because I liked that truck!
@@kjam4236 I’m getting a ticking sound from what’s sounds like the intake manifold and I’m getting a wine. I’m replacing the alternator the two sensors and a thermal housing unit.
I have 2 friends in California. One lives in Huntington Beach and the other in Pomona. If you would like them to diagnose it I can send them a message. I’m just not sure what their diagnosis charge would be. But I trust them on making the right call.
Hey Oz. I've changed both the camshaft and crankshaft sensors and still have a rough idle. I also have an oxygen sensor going bad. What should I have done next?
I have a 2010 Chevy Equinox and we have replaced my intake sensor twice and after replacing it last week the check engine is on again. I wonder if the alternator could be the problem ?
YOURE AMAZING!!!!!!! Thank you thank you, thank you for the truth!!!!! YOU PROVED IT!!! WOW!!! I love you, bro! SIX professional opinions, NOTHING!!!! Wow, again!6
I just got the P0340 on my 99 Ford Explorer EB 5.0 but I don’t have a scope to determine if it’s my alternator but I do have suspicions that it could be the alternator how could I tell?
rawdeale get an alternator and change it, if it fixes it drive on, if it doesn’t take the alternator back and replace the cam sensor after checking the wiring.
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Awesome video explained a lot However I have a new alternator in it turned out it was an alternator fuse but I already replaced it now I see the wires plug that goes into the alternator is very loose and not making good contact could that cause crankshaft positioning sensor to trip
You might of just solved my issues. I have a 06 3v gt with a p0340 code and before the code popped I had a check charging system light pop and go away and my alternator whines at high RPM and car surges
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The power of oscilloscopes and people that know how to use them. Good job, Oz!
Just having fun with the scope. Thank you for watching
Excellent work Oz, I have been chasing a cam sensor fault on a 2001 twin turbo Subaru Legacy. I swapped out the sensor, checked and double-checked the wiring and so on. I was getting to the end of what I could check! scoped everything and hey-presto NOISE! That alternator seemed fine, was putting out a good charge and all but was causing interference. Changed the Alternator and the vehicle runs beautifully. Thank you so much for your great video.
Awesome!!! Glad this video helped out. Thanks for watching
A man that actually knows what he's doing!!! WOW!!! Very impressive!
Thank you very much. Feel free to check out my newer videos to see more exciting diags
Found this video as I am tackling a stubborn P0335 Code on a 2010 Honda Civic Hybrid (not my first choice in a car but as a ride share free lancer; it is my bread and butter) Replaced cam sensor (New OEM) and it’s back six months after the repair. Ocasional abnormal idle. Rpm activity will act up while driving and shifting gears. Lurches every now and again while driving. I appreciate this thorough and informative video. I am still scratching my head on what could be causing this code but it looks like I found myself a good channel to subscribe to in the process. Video notifications are turned on. Great video!
Paradoxx thanks for stopping by and checking out the video and for subscribing as well. Have some new videos coming out soon
Good job Oz. Really appreciate your videos. From experience 120 mV AC to 250 mV AC seems to be the max allowed ripple depending on manufacturers. Usually outside this range you'll get sensor related codes just like this beauty you diagnosed. Even if no codes occur it's good to test AC ripple when newer batteries are testing bad. AC voltage is bad on batteries.
Billy Yoder thanks brother. Yea I’ve been waiting to get something like this. I’ve read about them but haven’t messed with one that would mess with the cam.
Now how would anyone ever see this without a scope?! Beautiful video Oz ! Great diagnostic process all the way through
i was thinking the same question ...
without his searching scope wouldn't solve it at all , scope is a good tool when a good reference is available which is not always the case , which proves that the scope is just a fancy tool but it's not necessary at all to have
amr hamed so how then would you pursue a flex ray network failure due to signal attenuation? It's not a fancy tool at all. It's quite basic . And if used properly is one of the greatest in any diagnosticians arsenal. Are there other ways ? In most cases yes , but certainly not all. A decent scope is under 100 dollars. A snap on ratchet used is the same price. Remember that we do not have the luxury of just repeatedly fitting parts to see if it's the failure. We only have a few hours and that customer must have their vehicle back. Where are you from if I may ask?
amr hamed never mind . I see you like Scotty Killurwallet. And you also know now how to super clean an engine bay as well thanks to Chris.
BTW i have a pico scope but you already said what i am trying to say ( Are there other ways ? In most cases yes ) that's it
That was an awesome diagnosis, Azael! Great scope work too. Also thanks for the custom PHAD shot glass! :)
Pine Hollow Auto Diagnostics glad you like the shot glass
I had a similar issue with my 09 explorer 4.6,had a P0341 and it turned out it was the alternator problem,changed my alternator and the code disappeared buy itself .Thanks for your video bud
It's things like this that motivated me to buy a scope. Love the diagnostic strategy. Excellent work Oz 💪
I have a 2004 F150 with the code p0340. Changed both of the sensors and check engine light lights up after a while. When the truck is in parking, it feels like a rough idle but once i put it in drive, theres no rough idle. What do u think?
Dido on the scope fixing to get me one.
Great Video Oz! I wouldn’t have guessed those small ripples on the cam signal would have such an effect, but when you changed your time scale you can see it clear as day. Thanks for sharing!
Thank you so much for the thorough research. This is related to the problem problem I am facing right now. I'll give it a try removing alternator cable or drive belt and see how my car will react to the changes.
Wow . thanks bro, from I install a new alternator I been getting that p0340 code, I change the cam sensor two times still no change , so it is the altinator, 1998 lincoln navigator. Thanks a lot back to AutoZone I go
It might be something else that code is pretty vague. The proper way is to hook an oscilloscope to it
Check engine came on and code P0340 cam position sensor. I replaced and check engine light still on. So I did another scan and code P0340 was coming up, suggesting that I check the plug of the sensor. It looked good. Watching your video alternator will be checked. Thanks for the info.
Did it work?
Did it work for you
Had this problem with my mustang 12 years and no one had a clue what was wrong with it. I eventually found a clue on a crown vic forum and got the alternator rebuild. The guy thought I was crazy for thinking it would fix the cam sensor code
Great video dude! This probably saved me from just running and buying the sensor that the codes are related to if they aren’t actually the problem
I'm having this problem right now on a ranger. I don't have the fancy tools and would not have found this. Thanks. I wonder, however, batteries are capacitors that are used to clean up noise on dc. Shouldn't the battery have cleaned up this problem? I wonder if there is more that is wrong here. Thanks.
When I first started down this path of learning about diagnostics, I was attempting to find a way a DIY'er could bypass using a scope and use common methods (cheap). But as I learn, I have also realized having a scope is required, or, you take it to a good shop.
That is true. Scope just makes everything easier and clarifies the actual problem. Once I got my hands on one I was hooked
I got a question. I just replaced my cam sensor (bank 1) on my Nissan Pathfinder 05 and the code is still coming up. What possibilities do you think it could be? Connector? Wiring? Defective part or maybe something else? Because my car starts fine and runs, just bugging that I can't find the root problem. Thanks for the video, gave me more insight!
Can it prevent the car from starting at all with this fault in the altenator, where you have P0340 present?
Very good information I’m in the middle of an electrical problem but I never thought about the alternator causing all those issues with the campshaft thanks a lot very good video👍🏼
Man, bro i have a 09 Pontiac g6 , its throwing the cam position sensor . I changed the sensor , the car still acting up. The car runs fine but check engine light is on , what should I do ??? Please help!!!!!
Did u get it fixed?
Nice diag work bro'
This one reminded me of a '94 Acura Vigor that would start misfiring around 2500 rpm. It was late in the evening, so I decided to bypass diag mode, & jump straight to iATN Fix Database mode, where I found one hit on this symptom, which turned out to be related to excessive diode ripple. So, I removed the connector from the regulator, & viola, symptom gone! New alternator fixed car.
Thanks for another great diag vid.
Good job on the video, not all of us have an expensive snap-on scope, how do we diagnose a P0340 code without an expensive scope?
Any oscilloscope should work here:a cheap chinese one aught to do just as well. The Snap-on one is just made with Automotive use in mind (and they're built like tanks).
You may also be able to remove the alternator and take it to a shop to have it tested for this as well, which might be a cheaper option then taking in the whole car.
Had this problem with my 1984 Camaro. The choke light would flicker and the key buzzer would partially come on at certain speeds. It was the diode trio in the alternator had lost one diode function. Ac feedback caused the choke light to flicker. 7 dollar part.
Great catch on that signal. True diagnostics at work!
Joe's Auto Electric thank you very much. Have a new video coming out soon that was a fun job
You would be vey hard pressed to find that without a scope. Fantastic work Azael
Yea that would have been a wild guess there. Hey thanks for stopping by
I have a 2004 Nissan Frontier 4x4 3.3L V6. It all of the sudden would just not start. It threw the P0340 Code so naturally I had the County mechanic replace the distributor because that is where the Cam position sensor is; well, it still didn't fire after that. I saw another video that said this code could also be caused by the Crank position sensor, so i ordered one of those and it hasn't arrived yet. I also ordered a knock sensor because I also got that code a while back when I was having misfires and needed to replace spark plug 6. It is winter here in Northern MN and my truck is a long ways away from civilization parked in the snow. I really need some help with this one.
Is there a way to diagnose this without an expensive scan tool? I've just got a fluke meter and a cheap Innova scan tool that doesn't graph.
Did it have a rough idle/misfire as well? I have the same code all of a sudden. What else will throw a P3040 code on a 2007 3.0 Ranger? Tyia Also, I replaced the synchronizer and Sensor but that didnt help. My mechanic says it could be a valve issue but it happed suddenly. Will a CKP sensor throw the p3040 code and not the ckp code? Bad PCM/
You would have to verify it has good power and ground and that the sensor is actually producing a signal but with that you would need a scope
Added information... the Radio suppression capacitors are found on the front of the engine. Those capacitors aren't for the "radio." Capacitors filter out noise just like what you saw on your scope. In other words they filter out radio frequency noise (RF noise). You might have fixed it with the alternator but I believe the better fix was with the capacitor... it only costs $8. Soon the new alternator might cause the same problem and you'll be in the same problem. Excellent video but go further just like you said and don't throw parts at your car. In fact might be able to clean the connections on the capacitor and it'll be free.
Does my 2014 Ford mustang v6 3.7 have capacitors?
@@florenbaron7111 There's a good chance it does but often they are called something else. Noise filter, DC filter, Noise Reducer, etc. Inside it's usually just a capacitor.
Thanks for that tip !!!
Thank you so much I have problems with my cam sensor didn't know what was going on until I watch this video and told my personal mechanic and everything worked out right thank you
Loved it , excellent presentation !
I’m having similar problem with my 94 3.1 liter Olds Ciera , gone through 13 cam position sensors , very frustrating, especially if that’s not the problem , same trouble code here
13 sensors? , your halfway there man, don't loose hope, don't give up on that one, you are never going to forget that one,
@@sargetester99 bahahahahhahaha
I replaced like 3. They last for like 6 months to a year. Always wonder why same code comes back.
Could a bad alternator with a po340 code cause no start for any reason?
Wow! Excelente diagnóstico! Muy buena observación mi hermano, sin el scope le hubieran metido hasta agua bendita para tratar de arreglarlo.
Moving Up Auto Diagnostics 😂 😂
Nice video, what did you actually disconnect on the alternator to clean up the signal?
The connector
That was fantastic Oz!!! 😎💪👍 Way to prove it out. And the great thing is once completed you can verify the repair with confidence! Great lesson
Thanks
Thanks for watching
I done my timing chain on astra h, as soon as you suspected the alternator, a bell rang in my head and I dont remember plugging this little connector back in. :/
Great video my friend you rock. Sure helped me on my 97 GMC Sonoma same problem alternator
Sweeeeeet and glad this video helped out
What have you disconnected at the alternator side precisely? I wasn't able to see clearly on the video. Thanks.
I have this code on a 2012 Chrysler 200 I just picked up cheap. Has new cam and crank sensors and a new connector in the back. Connector tests 5v on one side and minimal on the other. Before the charred connector was changed it was reversed minimal on the othet one and 5v on the one now reading low if that makes sense. Could it be the alternator?
cool man! good job. I got a p0340 code on a Pacifica that will now not start...even after I replaced CPS. BUT!, you have given me another place to consider.
Did you fixed it ?
Well?
I got a 2000 Cadillac Deville DHS it has several codes and im now wondering if it all related to my alternator....putting out to much voltage??? Great video... got the 0340 and couple other electrical issues, hmmmmmm
Is the p0010 code for 2015 Hyundai Sonata sport 2.4L GDI problem really is what the scanner says it is or the problem somewhere else? also where exactly is the cam position intake solenoid located because where everyone is showing it’s not there on my vehicle. Let me know please
I have an 03 neon that dies when driving. Have codes for cam and crank sensors. Replaced them both and took timing cover off to check it. The timing looked good but I put in a new belt since I had that off. There has been no change it still does the same thing. Is there a way I can test the food of the alternator without the scanner?
I’m running into this issue on my 05 mustang GT
I’ve replaced both cps and now the alternator
I had to buy a remanufactured alternator and my ripple is .19v is that expected?
Heloo Oz..this is pretty awesome. i am using a Lexus RX300 v6 engine and i had both my Camshaft sensors changed including the Crankshaft sensor. Both the Camshaft sensors responded positively except the Crankshaft sensors which failed to reset. The code keeps on coming back. i also have this Whinnying sound which all along i have been thinking it comes from the Power Steering Pump. Any advice?
If the alternator is noisy and it's not from a failing diode, wouldn't it be cheaper to install a filter capacitor on the B+ (alternator current output) wire instead of R&R'ing the alternator? Or just live with the noise unless it's bleeding into the speakers and sound system?
If my engine was running a bad idle AND the scan code was showing a 0340, then I would be 90% sure that the cam position sensor was bad and not worry about a noisy alternator provided it was still good enough to keep the battery charged at 13-14vdc.
If this was my vehicle that would be an option but this is a customers
Excelente diagnostico gracias x compartir sus conocimientos sobre la mecanica automotriz.
Gracias por mirar mi video :)
Hi there Oz I have that problem with my 2004 nissan pathfinder I changed twice my camshaft sensor bank 2 cause I don't have that equipment that you have, so you think maybe is my alternator?
You think this would apply to a 2006 5.7 hemi on a 300c Chrysler? I’m having this issue, car starts right away when cold but when warmed up it struggles to turn on
How are you able to see the cam signal ? I’m using the zeus and have to use 20v scale with 500ms time base
Could you please make a video of replace camshaft position sensor of Ford transit 250? Thank you.
So this alternator is putting out more voltage? I'm having a lot of problems on my 2015 Colorado.. wish theres was a good mechanic like you in town.. 😵💫🚛
Does the camshaft position sensor brand matters, such as Dorman brand?
Great diagnostic and shows why electronic problems can be tricky. I hope those who don't wrench on their cars appreciate why the mechanics they pay can't always solve every issue on a 1st pass. It appears the alternator output noise coupled into the analog ground of the engine controller (needs more filters), and also that perhaps Ford chose a too-low threshold for the VR signal from the camshaft sensor. Perhaps purposeful so it would still work as the sensor magnet aged or if installation distance was off, but also makes it touchy to any noise in the signal or controller.
I'm betting any noise is irrelevant.
@@darishopkins2573 No need to bet since he proved the alternator was the noise source. He disabled the alternator so the engine then ran off battery alone and the camshaft sensor signal became very clean. He also researched the problem for this specific model and found where others cured the sensor code issue by swapping in a rebuilt alternator. The camshaft sensor error code then disappeared, proving that the noise was the problem (thus was very relevant).
Hello sir I have a 2013 Hyundai Elantra it has a code P0016 it’s reading a camshaft correlation Bank 1 sensor A
So I replace it and it’s still doing the same it starts rough and stalls
When it warms up it runs a lot better any idea what I have to look for or do
My 2006 Mustang GT has codes P0345 and P0349. Both of my cam position sensors are new as well as my crank position sensor (Ford OEM).I just replaced the lash adjusters, cam followers, cams and all timing components (everything new). I am 99.9% sure that the timing is correct as I took my time with it and had the crank locked in position with the tool and had the chains lined up on the dot on the crank and the other end on the phasers in their correct places. It says I basically have a VCT solenoid stuck open or my timing is off and that my cam position sensor is bad. The car will start up and idle, but if you try to give it gas at all it backfires through the exhaust. I do not have this expensive scanner. Please help me out if you can. Thanks, Frank.
Any answer on this I need it too
@@damianwayne5302 I found out that I had the aftermarket non OEM cam phasers on in the wrong orientation. Driver side "L" at 12 o'clock (on colored chain link) and passenger side "R" at 12 o'clock (on colored chain link). Once I found my issue and reset my timing chains and phasers I was good to go. The most common issues are a stuck VCT solenoid(s), bad alternator, bad timing/jumped timing.
So p0430 it’s a universal code across all obd2 scanners for all cars ? I have this same code p0430 but it says O2 sensor / catalytic converters problems on a gmc
P0340 is a cam code
@@OzMechanics hi thanks, really!? Every where I have looked said P0430 was a catalytic system low efficiency issue, are you sure?
Will this also cause a high pitch whine like a super charger on my radio
That was great , my cam pos sensor is barely a year old. The body that the sensor rides on was changed about a year and a half ago. That damn p0340 pops up every month or so, truck runs good so I don’t think that it’s sensor. It’s gotta be the alt. Thank You for the Video.
so was it the alt ?
awesome troubleshooting, good mechanic!
bud prepper he’s technician cus he diagnosed it and confirmed what the actual problem was ;) a mechanic just replaces parts hoping it’ll fix it
Hey Oz I have a 2005 Subaru Legacy gt i have a cam sensor circuit code and i changed them both changed the oxy sensors had new coils an sparks done an a month later i got the cam code but it runs fine but when i go to slow down it either dies or has a rough idle. Not all the time does it do this though it is random. Most of the time when i crank up it has a moment or two the idle sounds rough an some times when i put it in drive or reverse it acts up but its random though so no consistent. Would that be the wiring harness to the sensors? being its a Subaru not the best wiring. Or would it be something else cause its not feeling a running like a bad cam sensor thank you for your time!!
Good diagnostic video, thanks alot. But I got a question, after disconnecting the alternator, what happened to the alarm P0340.
Waheeb Sayani Is which alarm are you talking about ?
@@OzMechanics As i understood from your video is that the alarm P0340 was actually generated due to high ripples generated from the alternator, so you disconnected it, my question was, did the Alarm P0340 was cleared after you disconnected the alternator?
Waheeb Sayani if you mean the check engine light. It has to be cleared
@@waheebsayani4111 codes stay in the computer until they're removed (either leaving the battery unplugged for awhile, or using a code reader).
Because of that, you can have a situation where you're not sure if a code is current or just a uncleared older issue.
another great video with great info on the scope thank you
Hey, so we have a 2v mustang that’s throwing the code, we took it to 2 shops and a Ford dealer and they couldn’t figure it out. We did like 3 alternators, 1 even failed on the highway on the way home. They changed the wiring also. The car even has new spark plugs from a shop. Is there any other reason it’s still throwing the code? Could it be a timing chain, the car never starts first try.
Thank you for the informational video. I got this code on my o3 civic lx 168000mi when I was going uphill on a dirt mountain road @ 35mph. The engine lost power and shutown and the p0340 came on. I cleared the code and was able to come home. Two weeks after it came back on but the engine didn't shut down. Three weeks later came back on again. I cleared it and hasn't come back since then. Checked the alternator and battery and they are good. What should I do? I also have a cat convert below threshold codes that comes and goes every now and then.
Hi OZ I have a 2006 dodge caravan and I have an issue with it I got an engine light on and it started to run rough tough to start and jerking at roughly 2500 rpm diagnosed both sensors and wires there perfectly fine can the alternator cause this ?
Any chance you're in FL?
Texas
What should the ripple be?
Greetings and thanks for the video. Is the camshaft position sensor located in this area as well (2006 Kia Optima)??? My car is running badly and cutting off after fueling and while driving. Could it be the camshaft?
I would recommend taking it to a reputable shop so they can perform a proper diagnosis. I would hate to see parts thrown into the vehicle
@@OzMechanics Thanks for the info and response. I'll get a 2nd look and crazy thing is I already changed the CMP. Praying for an affordable solution 🙏🏾🤑
so i just recently replaced the spark plugs and coils on my dodge and after i put everything back and went ahead to turn on the car, the check engine light came on immediately and it threw multiple codes witch were the following... p0340,0365,p1dd2,u1424 any ideas as to why that might be??? i did disconnect the cam shaft position sensor at one point when i was replacing the spark plugs but i made sure to disconnect it very carefully and plugged it in right back afterwards, i would definitely appreciate any ideas you guys might have in regards to this situation
I liked your video tons more since minute 6 👍🏼
You do nice work.. Other sites have accused the alternator..You explanied and proved it Thanks.
Thank you very much. It’s nice to know you appreciate my video
Could this be the same issue on my 5.4 e-350 econoline??
Very well done. I wish your shop was closer
I also think that my transmission Governor solenoid sensor needs to be replaced as well because it won't shift into gear 3. Out here in Atlanta Georgia it seems like people at mechanic shops don't want to help me so I'm thinking of buying some tools and fixing the problem myself
2003 Honda Accord 4cyl.
I got a check engine light P0341 that i need to clear.
It sounds like a lawnmower when i start it and the RPM drops and dies out.
I changed the spark plugs and coils with new ones and
It cleared the 4 codes it had that were P0300, P0301, P0302, P0303, P0304
HELP?
Bro I got an 05 Sunfire. I've got ignition coil, module, crank shaft position sensor, and spark plugs replaced. I still got a check engine light on but it runs better. It was shaking really bad. It throws a cam shaft code but when I go to get the part its like it don't exist. I'm so confused and angry. What do I need to do .
I have 06 fusion 2.3l that is throwing a p0340 cam sensor code and had another cam sensor laying around so I swapped it and code still comes on. When driving it bogs down and won’t accelerate over 15 mph. Alternator don’t have a whine to it, could it still be an alternator??
Tyler Dixon would have to look at it with a scope. To see what the signal wire is doing on your crank sensor. Other than that it’s only a guessing game
Saved me time and money my xterra is doing the same thing. I’m seeing a spike in between the cam sensor trigger I’m going to test on alternator side just to verify the spike disappears. Appreciate your video. 👏🏽👏🏽
I have an xterra throwing the camshaft sensor circuit failure code right now.. What did yours end up needing done?
Would the typical alternator test that an auto parts store does for the battery/alternator catch this issue?
John Just they offer ripple test
@@OzMechanics I have access to an oscilloscope so I could do the ripple test. I don't think they look at ripple....just do load testing to find the amperage/voltage in no load and under load. My Lexus threw the p0335, p0345, p0340 codes all at once and has weak starting after letting sit for a couple days now, so I'm guessing it's alternator/battery.
Yea at Autozone tester they offer ripple test. But using the scope is going to be your best test
Thanks for the video, I got a problem where I have trouble to start hot engine on Citroen Jumper 2,2 hdi150 - I have changed many sensors and starter and no effect - I just might be that I got faulty alternator and that gives bad voltage specially when its driven hot. Alsoo I got the P0340 and P0016code. Cam and crank sensors have been replaced no effect so far Thanks for video - seems I need to try new alternator.
Good video I have a 2004 Mountaineer,I live in Illinois where I just failed the emission test one of the codes was this one P0340 and the other was P1336 from what I could look up one was the cam sensor the other the crankshaft position sensor do you think a bad diode could effect them both because the truck is running just fine,any suggestions
This is the problem I have. Idk what to do
@@thomasbackovich3045 man good luck I ended up replacing the camshaft and crankshaft sensors that didn't changed the plugs a couple of bad coils and battery and alternator after the mechanic and other mechanics were saying put a engine in it it wasn't worth it so I got rid of it.... I hate it too because I liked that truck!
@@kjam4236 I’m getting a ticking sound from what’s sounds like the intake manifold and I’m getting a wine. I’m replacing the alternator the two sensors and a thermal housing unit.
My check engine lights on, and I NEED to smog. Has a new cam shaft sensor, but still no bruno. Thoughts? Thank u
If you’re in the LA area I can recommend you to a shop that can diagnose it right
@@OzMechanics I'm in Camarillo. Like 45 min north of LA
I have 2 friends in California. One lives in Huntington Beach and the other in Pomona. If you would like them to diagnose it I can send them a message. I’m just not sure what their diagnosis charge would be. But I trust them on making the right call.
Hey Oz. I've changed both the camshaft and crankshaft sensors and still have a rough idle. I also have an oxygen sensor going bad. What should I have done next?
Might be you bad air mass sensor
I have a 2010 Chevy Equinox and we have replaced my intake sensor twice and after replacing it last week the check engine is on again. I wonder if the alternator could be the problem ?
Try a cam/crank correlation relearn or clean the vct solenoid
Do you have a video for detecting misfire with no codes using oscilloscope?
It has codes. But I used the oscilloscope to find the problem
ua-cam.com/video/bAscM284I4U/v-deo.html
@@OzMechanics thank you 👍👍👍
alternator noise feeding through the entire power lines. Nice. The should put filters on cam sensor. nice video
YOURE AMAZING!!!!!!! Thank you thank you, thank you for the truth!!!!! YOU PROVED IT!!! WOW!!! I love you, bro! SIX professional opinions, NOTHING!!!! Wow, again!6
I just got the P0340 on my 99 Ford Explorer EB 5.0 but I don’t have a scope to determine if it’s my alternator but I do have suspicions that it could be the alternator how could I tell?
rawdeale get an alternator and change it, if it fixes it drive on, if it doesn’t take the alternator back and replace the cam sensor after checking the wiring.
Thanks bro life saver.. I got the same problem whit this code tomorrow I’m check the alternator signal and camshaft signal too new subcriptor
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Hi I'm getting p0340-2 low circuit on my camshaft sensor do you reckon that could be the alternator
I would hook up a scope to the cam sensor to see the activity on the signal wire
@@OzMechanics that's what I was thinking hopefully it'll be able to shed some light on the issue thanks for the reply
What is the year, make, model, engine size? Of the vehicle in this video?
sargetester99 2003 Ford Mustang gt 4.6
Awesome video explained a lot However I have a new alternator in it turned out it was an alternator fuse but I already replaced it now I see the wires plug that goes into the alternator is very loose and not making good contact could that cause crankshaft positioning sensor to trip
KNOWLEDGEABLE Oz Mechanics
Great tutorial thank you very much helpful video
Oz Mechanics
Good Morning 🙏 🌄
From Nick Ayivor from London England UK 🇬🇧
I just changed the sensor in my 98 ranger but it's still misfiring and I may not have had tdc
Have you looked at what cylinder was misfiring ?
You might of just solved my issues. I have a 06 3v gt with a p0340 code and before the code popped I had a check charging system light pop and go away and my alternator whines at high RPM and car surges