Wells EVAP Training with Sgt. Tech. P0440, P0441, P0442 etc.
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- Опубліковано 24 лип 2024
- www.wellsve.com/ This video demonstrates how a typical EVAP system functions. P0440, P0441, P0442, P0456, P0457, P0455, P0443, P0446, P0449, P0450, P0451, P0452, P0453, P0496 trouble codes with explanations and possible causes. Why Wells fuel tank pressure sensors are rated the best.
"The information presented in this program is based on a specific diagnostic case and might not directly apply to the vehicle you are repairing. We do not represent or warrant that the information presented is complete or error free. Please take all safety precautions. We disclaim any and all liability for losses, injuries or damages in connection with your repair." - Авто та транспорт
You choose to listen and then complain ? These videos are extremely helpful and very well presented and they are FREE. I say thanks a million times for these videos and the way they are done. God bless
Thank you Mark!
This has got to be the most thorough video on the EVAP system I have seen to date. I have been looking all over the internet for the last month trying to figure out why my codes keep coming back.
I now know much more than I ever knew before, thanks to this video.
I have copied down that list of 14 codes that I am sure will come in handy in the future.
I have replaced the vent solenoid on the canister, gas cap and just purchased the purge solenoid bolted to the air filter
Should get here next week.
2 Garages have yet to come up with what the root cause is. I even had them do a smoke test to check for leaks and they found none.
I am keeping my fingers crossed on the purge valve.
Codes are P0440, P0441, P0442, P0446.
2002 Toyota Sienna LE.
Barry
Thank you for the kind words. It sounds like you have a tough problem. Hang in there, there is always an answer. Below is the test procedure for the codes you have on your vehicle. The most probable causes are : cracked - loose hoses, canister, fuel cap, canister closed valve and vacuum switching valve ... in this order.
1. Verify the gas cap is a factory Toyota gas cap.
2. Locate the Canister Closed Valve (CCV), on or by the air filter housing, and verify the hose is connected and not loose.
3. Test the CCV, the Purge Solenoid (PS) and the Vacuum Switching Valve (VSV) on the charcoal canister, by manually grounding them and verify they operate and function properly. Some scan tools will activate the solenoids also, so it is a good thing to activate them through a scan tool so one knows the wire harness and the Engine Control Module (ECM) is OK. The CCV is normally open and it should close and hold vacuum when grounded. The VSV on the canister is normally closed, and when grounded, should open. The PS should open when grounded and apply vacuum to the charcoal canister for purge control and evaporative system testing.
4. Next, simulate an evaporative test and verify the system holds a vacuum and functions normally. To do that test, get to the ECM and backprobe the signal wire for the pressure sensor. It should read around 3.3 volts, no vacuum or pressure. Next, ground the CCV and the VSV on the canister. Start the vehicle, and if there is manifold vacuum to the PS, manually tap it to ground and draw a vacuum in the evaporative system and the fuel tank, then verify the pressure sensor voltage drops to around 2 volts. Then stop grounding the PS and see if the system leaks. If a smoke machine is used, the canister will leak, so clamp off the hose, that commonly has the Yellow stripe, to test the system.
5. Always ground the CCV and the VSV solenoid, on the canister, 20 to 30 times and verify they still operate when hot.
Stay in touch,
Mark Hicks
Wells Vehicle Electronics
Pipecorn i know you posted this 7yrs ago I but what was your final root cause? I’m chasing down this issue now myself on my 2011
wow thanks for the post. I have been doing this work for years and this is the best explanation of the way the system operates. Makes it a lot easier to troubleshoot when you know how it works and what it looks for to set the light.
You are welcome. If i can help you further, just let me know.
Mark Hicks
Wells Vehicle Electronics
Thanks so much for posting this. This is the best explanation about the EVAP system that I have ever heard. It cleared up a lot of things for me.
Wow. This makes more sense of other videos on evap system. I totally misunderstood the purpose of the vent valve before watching this video..Awesome job .
Thank you for following up with the results. It was my pleasure.
Take Care,
Mark Hicks
Mark,I put the charcoal can and vent valve on my sentra.Found it used on ebay.Did the trick.You saved me a ton of money.You're a genius.Thanks a million.
Didn't know a EVAP video could be somewhat entertaining to watch. Now going to fix my P0442 issue. Thanx!
Haha who knew? Thanks for watching Jeff!
Mike Becker, Senior Instructor
@Kasilindo
3. Functional test would be to supply power and ground to the valve, it should fully open and close when ground is removed. Would recommend testing multiple times in case it sticks intermittently and look for evidence of moisture that could cause it to hang up in cold weather.
4. Check the feed line to the purge valve, one should be able to draw freely through it and get the smell of fuel. Inspect the under side for damaged lines
You are very welcome. Knowing you enjoyed and learned from our production makes all the effort worth it!
Take Care,
Mark Hicks
Wells Vehicle Electronics
Thanks for doing the impossible: making an evap emissions systems video entertaining. An evap video with 559K views(6/23/2019)proves it.
The voice-over actor must have been happy to use his acting skills.
Hahaha thanks for watching Joe!
Mike Becker, Senior Technical Instructor
When conventional educational tech videos are shown to a class of tired technicians it's easy for them to fall asleep. Not so with the Sgt .Tech video,it will keep them awake.
Haha glad it'll keep them awake.
Mike Becker, Senior Technical Instructor
Thank you for the kind words. We are grateful you took the time to leave such a great comment.
Mark Hicks
Wells Vehicle Electronics
Trying to work thru an EVAP issue on my truck . Wish I would have found this video first as it explains everything you need to know . One problem was the video was so entertaining it had me chuckling a bit due to the DI character's lines . Well done !
Thanks for watching!
~Ryan Wilsing
Awesome info and explanation right there!! Thanks so much.
Hey Rosas, thanks for watching!
Mike Becker, Senior Technical Instructor
Thank you for the kind words. Your feelings about the video are exactly how we wanted it to come across.
The P0452 on your vehicle is many times caused by a broken Dark Green signal wire. Usually it breaks either by the master cylinder or under the drivers seat carpeting. Check the Dark Green wire for an open or short to ground from the sensor back to the Powertrain Control Module (PCM). Goes to Blue connector pin 39.
Hope this helps,
Mark Hicks
Wells Vehicle Electronics
Yeah, I was leaning towards this as it is a common fix on my car. Thanks for replying back. If I figure it out I will post back with what it was and how I pinpointed it. Thanks again.
3. On this system Toyota is using a leak detection module on the charcoal canister and the module includes a pressure sensor and a canister vent valve and a vacuum pump. The pressure sensor will monitor if the purge solenoid under the hood is working correctly and then monitor the system for a leak when the ECM grounds the canister vent valve and then the pump will pump vacuum into the system to check for leaks.
Wowww... That was really a cool video and the learning really sticks with you! We as techs need more like this. Funny but gives real world learning that a tech can appreciate!!!! I subscribed!!! 🛠️🛠️🛠️🛠️🛠️👍
Man i gotta tell you Mark, these are some of the best insructional and easy to understand automotive related videos. I'm gonna be taking the Engine Performance(A8) and HVAC (A7) ASEs in November, and these videos you have are helping me tremendously. . Really appreciate it!!
You are absolutely correct! I have a Tech 2 and Snap on verus and they will both function the purge and vent solenoids on GMs. The verus is capable of doing this on most vehicles. Excellent input, Thank you,
Mark Hicks
Wells Vehicle Electronics
wow i remember watching an old school video (probably made in the 40/50s lol) on how the brake system works. set-up is like a "mechanic military training video." its black and white but very informative. i understand it more than reading my automotive books. this video is also similar to it. this is a great video for us all. thank you sir! i also had a P0452 DTC on my 2003 pontiac sunfire and i dont have any idea about the evap system. now i have a better understanding how to fix that DTC .
Thank you for the kind words, they mean a lot to us!!
Mark Hicks
Wells Vehicle Electronics
This video was extremely helpful!! Thanks!
Thank you for the kind words, they mean a lot to us!
Mark Hicks
Wells Vehicle Electronics
Gracias! Excelente video explicativo muy claro para cualquier hispano parlante. ;Muy agradecido y like
Hello Dalukebark,
It is pretty common for the purge valve to stick open on your vehicle and cause a P0441 code to set. Remove the purge valve and first check to see if it is stuck open. If it is closed apply power and ground (9volt battery works well, polarity does not matter) to the valve and blow through it to see if it is opening all the way. You may need to do this several times. Either way it is probably your problem.
Keep in touch,
Mark
@carlosderek Thank you for the kind words. In fact we have another EVAP video coming out soon.
Mark Hicks
Wells Vehicle Electronics
A P0440 can be a tough diagnostics. If you seal the system and apply pressure or vacuum, depending upon the system, you can watch the voltage change on the pressure sensor. I am happy to hear you were able to correct your problem.
Markjhicks: thank you for your answer. as I mentionned, I changed the charcoal canister but this did not fix the problem for the code p0441. According to the video means that NO FLOW DURING PURGE CYCLE. So the problem is between the charcoal canister and the engine. I think there is only one part which is under the hood, is the VSV: Vaccum Switch Valve. You said you should check the VSV and Vent solenoid. I am gonna change the VSV then I will see if it will fix the problem.
Thanks again for your information.
We came to learn and share our experience in order to help each others.
Perfect! I love that!
Mark Hicks
Wells Vehicle Electronics
tanumi e hey! I know this is a 5 year old thread, and I haven’t been through all the comments yet but I am getting the same pO441 code on my 2001 B5 Audi. Did you figure out what the part was that was the curse of your p0441 code? I don’t open and just changing parts and crossing my fingers, luckily I am getting no adverse effects from this code other then the ‘check engine light’ with is annoying but not enuf too spend money I shouldn’t on EVAP parts!
Any reply would be appreciate! Especially after 5 years!!! 😀
God Bless
Thank you your kind words mean a lot to us!
Mark Hicks
Wells Vehicle Electronics
Thank you for the kind words, they mean a lot to us!
We wanted a fun way to approach what can be a dull presentation. Kind of like taking medicine with a little bit of sugar.
Take Care,
Mark Hicks
Wells Vehicle Electronics
@eallanboggs I like the way you think! The next question should be, in my opinion, how much damage to the atmosphere do the fumes really cause? Or is this just another exaggeration?
Mark Hicks
The purge solenoid is the gate to allow fumes stored in the canister to flow into the intake and then the combustion chamber. This typically happens when the engine is cruising and the vacuum is somewhere around 10 inches. If it was connected to the air intake it would pull much harder and the possibility of drawing raw fuel would be much greater.
Hope this helps,
Mark Hicks
Wells Vehicle Electronics
Very informative video. I don't mind your presentation style, it is much better than a computer generated voice like in some other videos out there.
Excellent presentation. A great reinforcement for those recent seminars. And why do ppl complain about Srge Tech?
Hey, its old animations and stuff. The info is good, the presentation is....old. Thanks for watching!
Mike Becker, Technical Services Instructor
Hey thanks alot! And your videos are the best, I solved my problem with my 2000 chevy express Po452. It was a loose wire
wow, cool and useful video:)
I have 2008 Toyota 4Runner V6 and few days ago I got P0441 (incorrect flow) and P0445 (large leak) per my OBD II reader.
With your expertise, what would be the first thing you'd check with combination of these above codes? I first plan to replace fuel tank cap with OEM. I already glanced at the visible hoses, what next?
Thanks in advance!
Thank You Sgt! You're a lifesaver!
Thank you for the kind words. If you have any questions be sure to let us know.
Mark Hicks
Wells Vehicle Electronics
Thank you for the kind words! Now Carry on ...
Sgt. Tech
Wells Vehicle Electronics
You are correct andimillard. When the emissions testing station does a plug - in test, they are looking for monitors that are set or not. When you clear the codes the ready-ness monitors are also reset.
Mark Hicks
Wells Vehicle Electronics
P0446 TOYOTA - EVAP System Vent Control Circuit. great video by the way
Awsome video!!!! very helpful thank you I appreciate it very much!!! Sir! Yes Sir!!!!
I wish they kept sgt. tech around , awesome..
@benjiego22 Thank you for the kind words. Glad you enjoyed the video.
Mark Hicks
Wells Vehicle Electronics
I really liked this video, exactly the kind of stuff I needed for my problems with Evap codes on my car. Ive got 4 codes on a 2002 Maxima and they have been there for a long time according to my father in law that gave me the car. They never had the valves replaced, which I am thinking the control vent valve AND the solenoid valves have failed. There may be other problems, but the repair manual for this 2002 Nissan Maxima seems to point all codes in that direction. P1448, P0455 (Yes I know) and P0021 for control vent valve. I just dont understand how their mechanic never tought of replacing or checking these valves, when I am not a mechanic, and from all the research I have been doing seems to be the issues. In your video you dont say what kind of problem this could cause, is there any way you could explain? At one point it says if the valves dont work, you could have Big Problems. Which are those? Got the codes from my OBD2 scanner and descriptions. My father in law did not know there was so many codes as he never really bothered checking, but that sucks since I am left with the vehicle, and to be honest I love it, and I want to fix it myself if I can.
Thanks for your answer on what problems this could cause to have the valves fail?
Melissa
This is a great video. Thanks a lot.
Could you help me about this code which is p0441. I changed the evap canister but without success, the code comes back. I never have had this code before I change the engine but just a couple days after the engine was changed. I have toyota corrola 01. Cy 1.8. I checked VSV with a 9v battery, it works and also I checked Vent solenoid is working.
VSV: is closed when I tried to blow the air
Vent solenoid: is open when I tried to blow the air.
The hoses are good no crackes.
do I have to check something else???
Please any help will be appreciated.
Thanks in advance
The solenoids should be energized for at least 3 minutes before being cycled, to see if they will hold the vacuum. Heat will cause the solenoids to fail intermittently. It is extremely common for the charcoal canister to cause this code on your vehicle.
Please let me know if you have any other questions and let everyone know the results.
Mark Hicks
Wells Vehicle Electronics
Got the P0499 Evap Canister Vent Valve Circuit high (pressure?) code on a 2009 PT Cruiser - does that mean the vent valve is stuck closed or what other problems might cause that code ?? Plugged canister maybe ???
Hey Ben, take a peak at our new EVAP system playlist videos. The Chrysler one in particular. It will explain more on that EVAP system on your PT Cruiser.
Mike Becker, Senior Technical Instructor
Can someone explain why my 98 civic throws code p1456 ONLY when the ambient temperature is below 70f? In hot summer the evap system works as intended. Replaced 2-way valve, bypass valve, and gas cap
I learned slot thanks this is the kind of videos nice presentation less talking more action
Thanks for watching!
Mike Becker, Senior Technical Instructor
Thanks for the video.
My 2015 Porsche Macan S (twin turbo, 15k miles) is showing a code p0456 (small leak). The gas cap was replace with the correct Porsche part. After 50 miles the Check Engine light reappeared with the same code diagnostic test. A smoke test was performed; no leaks apparent. Any suggestions?
Hey Jeff, sorry to hear you're having issues. I wonder if something is sticking intermittently? Maybe the purge solenoid is worth taking a look at?
Mike Becker, Senior Technical Instructor
On our 2004 Saturn Vue, we keep getting codes P0442, P0455, then P0108.
Runs fine, fuel mileage good for city driving in Denver, no noticeable EECS line leaks, going to replace Fuel Cap and see what happens? Erased codes and they didn't return after 4 engine cycles, will see if check engine light goes off eventually.
Hey ES Warren, hope the gas cap fixed it! That would be a nice easy inexpensive fix.
Mike Becker, Senior Technical Instructor
Fantastic video. Thanks!
Thanks for watching!
@2006DURAMAX
Thank you kindly for your support. This will help much vs taking the car to a tech.
I have not changed airfilters lately but will check for any disconnections.
Thank you for the update and great comment, we truly appreciate it!
Mark Hicks
Wells Vehicle Electronics
Some vehicles will run the EVAP while at rest. What is the year, make, model and engine size?
Mark Hicks
Wells Vehicle Electronics
@Colombianking497 Normally not. What is the year, make, model and engine size of your vehicle with the P0442 code?
Mark Hicks
Wells vehicle Electronics
Excellent, our goal was to have fun and teach in terms most everyone can understand.
Take Care
Mark Hicks
Wells Vehicle Electronics
Hey @Gotech I have a Chevy 5.3 with a p0440 do you think it's a purge solenoid or a leak in one of the lines?
Hey Nike James, that's a tough question. A P0440 is a generic evap leak code. Could be many things. Best thing to do would be to perform a leak test and confirm the location of the leak.
Mike Becker, Senior Instructor
Without knowing what vehicle you have, my first thought is a vent solenoid sticking issue. This is common on Domestic vehicles. On Asian vehicles it is also common for the vacuum switching valve to stick.
Mark Hicks
Wells Vehicle Electronics
Thanks for the strategies you have shared here.
Thanks! Hopefully it covered everything you were looking for.
Mike Becker, Technical Services Instructor
At 1:09 I liked the choice of a WW2 Jeep to as an example of an older HC vapor emitting vehicle.
Great point! You are right if there is air by passing the MAF it will affect the fuel mixture and cause idle problems!
Thank you for your comment bujashaka it is right on!
Mark Hicks
Wells Vehicle Electronics
@sharkzf6 Thank you for the kind words. An EVAP monitor can happen only at specific times, this maybe the reason you are not getting any codes. Nonetheless, you need to have the canister, vent and purge solenoids checked. The solenoids are known to be intermittent. Stay with it, don't let it get out of warranty.
Mark
WOW THE WAS REALLY HELPFUL THANKS ALOT
I am always here to help! We were all new at this at one time.
Please don't confuse what i said, EVAP canister purge solenoid, EVAP purge solenoid and the EVAP purge control solenoid are all the same part. Manufactures will at times call things different names but they are the same part. An EVAPorative will also have a vent solenoid. Usually these are the two EVAP solenoids the vehicle will have. The purge solenoid is on top of the engine and the vent solenoid is back by the tank usually.
Very informative.Good video.
Yes I already replaced the purge solenoid and having the same problem unfortunately. I know this problem can get expensive if I bring it to the dealership when they start changing parts out. Would a smoke test help? I am familiar with all that you asked as well.
Alright, so your 09 Civic...I went with a 1.8L option. If it is something else please let me know. If you unplug the purge solenoid connector, turn on the key, and check for power on the black with yellow stripe wire. That should have power with the key on. This is a hot circuit any time the ignition is on. The computer is in control of the ground side. Then check the yellow with blue striped wire for ground. With just the key turned on, the computer should not be supplying a ground. You should NOT have a good ground on yellow/blue unless you command the purge on with a scan tool. You may have a short to ground somewhere in that yellow/blue wire. This would cause the purge to be on 100% of the time. Potentially causing your problem. Let me know how these tests turn out, talk soon!
Mike Becker, Technical Services Instructor
1. Check for any vacuum leaks, even at the brake booster. This system will have an irratic idle if there is a vacuum leak.
2. Using a scan tool, check to see what the desired idle and what the actual is, normally these values are close to each other.
3. Block off the Idle Air Control (IAC) passage to see if that stabilizes the RPM.
4. Use a lab scope or Digital Volt meter to monitor the TPS voltage. If the voltage is erratic, check the sensor ground, if OK, replace the TPS.
Keep in Touch, Mark
Hello Chris,
A P0442 is not very common for your vehicle, however there are a couple failures you might want to check first before you have the system smoke tested. Check the fuel cap, some of the retail stores can do that for like AutoZone.
Then access the Canister Vent (CANV) solenoid on the carbon canister. Turn the key on and ground the Gray/Yellow (GY/Y) wire and check to verify that the solenoid is mechanically closed, by attempting to blow through it.
Next response...
Usually the problem is associated with the purge solenoid.
Verify that the purge valve vacuum hoses are connected correctly (purge valve is near the ignition coils). If all looks good it is time to take a chance and replace the purge solenoid. To test it further you will need a scan tool and possibly a smoke machine.
Hope this helps,
Mark Hicks
Wells Vehicle Electronics
very helpful and well explained.
now I'm pretty sure my check engine light could be from the purge solenoid.
how do I test that solenoid.
I didn’t have a 1998 Corolla obd gives me codes p0441 p0446.
Hi Nabil, thank you for watching! A purge solenoid is pretty easy to test. One way is to remove it from the vehicle and try to blow through it. If you can, the solenoid has failed. As this should be closed/sealed without power to it. That's the easiest way. Also, you should verify power going to it. Ground is usually supplied by the computer.
Mike Becker, Technical Services Instructor
you guys are great love the presentation
Thanks Larry! Great to hear!
Mike Becker, Technical Services Instructor
Keith urban
Thank you so much that is awesome. I think I can figure out the issue now.
Thanks for watching Billy Jack Simpson!
Mike Becker, Senior Instructor
I would check with smoke wizard. You can find them on the AES wave site.
Mark Hicks
Wells Vehicle Electronics
Very nice and funny videos! Just wanted to say thanks, nice work! ^^
Thank you! Your words mean a lot to us!
Take Care,
Mark Hicks
Wells Vehicle Electronics
4:26 The intake then creates a vacuum in the system, pressure accumulates, and it's measured by the fuel tank pressure sensor. What, is it, vacuum or pressure? Is the engine running or stopped?
Hey D D, check out one of our newer EVAP videos. I think it may be clearer for you. Thanks.
Mike Becker, Senior Technical Instructor
@Kasilindo No, this code will not make the engine stop running. Check for spark and fuel first, let me know what you find and I will help you.
Testing code P0441 BMW
1. Access the purge valve, attached to the lower front part of the intake manifold, near the mass airflow sensor.
2. It has two wires going to it, the Red/White/Yellow wire has 12 volts key on, and the Brown wire is ground for the control circuit.
curious how many different evap systems are there basically how many pipes are feeding in or out of the charcoal canister is it only 2 or 3 pipe systems or is there more like 4,5,...etc because some evap charcoal canisters look different and not so interchangeable however if you have a 3 pipe canister can you uses it on a 2 pipe canister evap car by caping the other pipe ... and visa-versa some combo t fitting ... are the components are the same for all the different evap systems or are there more or less that I am not aware of in this video
sam111880 Most evap systems function the same, with the canister, vent, and purge. Sometimes they are placed in different locations, but the generally function similarly. The Chrysler system is altogether different, using a leak detection pump. The evap components are made to specific vehicles for specific emissions outputs. It is recommend to only use the specific parts for their specific vehicle.
Mike Becker Technical Services Instructor
very informative video, I have a 2001 Chevy 8.1L RV with fault code 0446, tested vent solenoid and it opens and closes when power applied from outside source, but not when ignition switched on, always open. tested plug to solenoid and it showed 12v when ignition turned on but not enough current to light 12v test light. Does this mean I have a Bad PCM? and if so where is it located, Any other things I should be looking at first? Thanks for any light you can shine my way!
Sometimes a good visual inspection can find a leak, but, you are right the only way to be sure is to have it smoked. If the problem is a sticky purge or vent solenoid they can be detected by activating the solenoid.
Mark Hicks
Wells Vehicle Electronics
My truck nissan navara 2.5L double cab i have a big problem with the vehicle because the vehicle is high fuel consumption is also when I change the engine oil it becomes black in a few times
Please advise me actual problem
Hey Darkray, could be 1000 different things. Done a tune up lately?
Mike Becker, Senior Technical Instructor
Hi Mark, excellent video. Thanks for the lesson. I have a P0442 (small leak) code on my 2002 Nissan Maxima SE 3.5. I can smell gas sometimes when driving and even once the car has been turned off I can still smell it for about 5-10 minutes. It seems to permeate from the rear driver side of my car. I took a quick look under the rear of the car this weekend and I don't see a leak. Can you point me in the direction of what I might look for (usual suspects) when this code pops up for my car? Thanks in advance!
Here are the most common causes for the P0442 code on your vehicle. Check these first in order of probability, Fuel filler cap, fuel filler neck and vent solenoid.
Stay in touch,
Mark Hicks
Wells Vehicle Electronics
markjhicks Thanks Mark. I will let you know what I find this weekend.
Have the codes 99 f150. Would this cause truck to idle high in park and run rough when sitting like in a drive thru but runs pretty good other than them two times?
Hey Mike, in most cases EVAP related codes will not cause a driveablility issue. I have a feeling you have something else going on. What codes does your truck have in it?
Mike Becker, Senior Technical Services Instructor
Wells Vehicle Electronics
It has the p1451 and the p0443 codes .thanks
Thank you, great information..
I thank you and my 2003 Dodge Ram thank you
theseventhdwarph You and your Dodge are always welcome!
Mark Hicks
Wells Vehicle Electronics
This was a great video! Thank you. I have a 2002 Saturn SL1 with a P440 code, which you have explained as not enough vacuum…I have replaced the fuel cap, and switched out the oxygen sensor bank 1 sensor (due to another code) what else can I do to fix this issue?
@GabeJH82 The other line at the NVLD goes to the vent. Block the vent line.Using a hand vacuum pump, apply vacuum to the line while watching the voltage on the Violet/White wire. Voltage is supposed to change at approximately 1" Hg vacuum. Try testing this switch several times to see if the switch is sticking. Replace the NVLD if the switch is sticking. It is very common for the NVLD to fail on your vehicle.
I hope this helps you,
Mark Hicks
Wells Vehicle Electronics
Super video and explanation Sgt. Tech, thanks for the time you put into it and for sharing. I have a 2003 Dodge Ram (4.7L) with two codes, P440 and P441; not enough vacuum and no flow during purge cycle. What that might be for a Do it yourself person? I am gong to do a visual check in the case there is something loosen, then test the Purge Solenoid before buying anything. Any advice while I conduct these Pre Combat Checks with my Truck?
+Jose87694 The best thing to start with is a good visual inspection. As these trucks get older the rubber hoses like to break down and crack. If you have access to a full function scan tool, you could use the tool to command the purge solenoid on and off before replacing that. The hoses, purge and the NVLD are the most common repairs for those codes on this specific vehicle. Good luck! Let me know how it goes.
Mike Becker, Technical Services Instructor
Hi, I have a 01 Isuzu Rodeo v6 4x2 and the obdII is sending a PO440 code. What I need to check to solve the problem?
I love this Full metal jacket roo rah, Love it, he's just like my staff Sargent grandfather when he was alive.
Hey Jim, thanks for watching! Full Metal Jacket is a great movie.
Mike Becker, Senior Technical Instructor
@@GoTechTraining Your video gives a much better understanding of what the evap is and does, however, a p0443 is not just the solenoid, its the connector to it.
we found a defective evap canister boost sensor aka fuel tank pressure sensor when defective on Nisaan 2010 up causes codes p0443, p0456 and a o-ring dried out, causeing loose gas cap. Before replaceing evap purge sensor, teplace this first.
@markjhicks If the canister closed valve does not close and hold vacuum, then it will need to be replaced.
4. Check all the EVAP lines and hoses for leaks and check for a cracked or leaking canister. Also verify the fuel cap is tight and not missing and the seal is good.
I hope this helps, if you have any further questions let me know!
Mark Hicks
Wells Vehicle Electronics
@DonMecanico Best comment all week! It was a lot of fun to make too. Thanks for the kinds words!
Take care,
Mark Hicks
Wells Vehicle Electronics
Great video Mark! What happens when this sophisticated system fails to through a code when there is a leak? My 2007 Corvette smells of gasoline every time the tank level goes above 1/2 and yet no codes are thrown and after two visits my GM service manager says they can't find a leak even though he admits he can smell the gas! Thanks for any insight.
-JP
So what are your suggestions with p0445 large leak ?
Mark,I have a 2000 sentra with a 1441 code.It had a 455 and that was the gas cap.I pulled vacuum line off purge valve and I didn't fel anything at idle but did suck my finger when I revved it.Don't see any bad lines under hood or underneath.I took the black cover off in back and theres a bunch of hoses and three solenoids.I still smell gas when I get out of the car but it's not at the cap.Any input would be appreciated before going to the stealership.
@markjhicks To test the purge solenoid, verify there is battery voltage at the Black/Yellow wire and when the Yellow/Blue wire is ground the purge solenoids should open and vacuum should be applied to the charcoal canister.
3. Next verify the canister closed valve closes tight and seals off the canister. The canister closed valve is located on the canister and when the White/Red wire is grounded the valve should close and the canister should hold vacuum.
dippinsix4,
it is common on your vehicle for either evaporative emission vent or purge solenoid to fail. The puge solenoid is located near the throttle body and the vent is near the fuel tank. It sounds like the failure is extremely intermittent, so it might be tough to pin it down. You can energize both solenoids with a 9 volt battery, jumping to the two pins on the solenoids. You might have to do this a number of times to find the one that is not clicking. I hope this helps ...
@4man321 This usually means the vent solenoid is sticking. Because it is not sticking all the time, it makes it very hard to find the leak. If you want to throw a dart at it, I would suggest trying the vent solenoid. If you want to test it. Try smoking it and energizing the solenoid with jumper leads and either a 9 or 12 volt battery. Do repetitive taps on the connector to try to get it to stick.
Mark Hicks
Wells Vehicle Electronics
I got a 1997 Dodge Ram 1500 5.9 so I got a engine light for o2 sensor lower so I swap it ok so I change it it came back again for same o2 sensor but now I also got a code for purge valve
I got the purge valve I noticed that charcoal came out the purge valve hose so I decided to check canister the canister is no good can that make my o2 sensor go of also pls help ?
Great videos. Came across them looking for info on my 98 Hyundai Elantra that is throwing code P0442...evap system small leak detected. Has turned into quite a frustrating problem to solve and inspection time is approaching quickly. Is NOT a bad gas cap, my first "part thrown at it" try. Shops want quite a bit of $ to smoke test my car. Any suggestions?
hi mark thanks for this video i have a real idea how this work. thaks a milion.
Anyone can tell me what I need to do. ..I do have an explorer 02 and has a noise in the bottom where the pan of transmission is located the noise is like an vacuum and give gas and doesn't shifts ...the needle jus goes up but not runs over 20m/h