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Evaporative System Codes P043E, P043F, P2401, P2402, P2419.

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by High Mileage, Feb 15, 2017.

  1. High Mileage

    High Mileage Active Member

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    So my 2010 Gen 3 just turned over 200,000 miles the other day. I went to my usual Costco that I have been stopping at twice a week for the last 14 years to fuel up. I have never had issues getting fuel into the tank, but today it kept stopping after accepting a gallon or so. I moved to another pump, but it acted the same way. I got the car fueled up, and made a mental note of the problem. Yesterday when starting the vehicle after sitting all day at work the check engine light stayed on. This is the first time I have had a check engine light in 200K miles. My scan gauge indicated codes P043E, P043F, P2401, P2402 and P2419. I wrote down all codes and cleared them. The next morning after sitting all night I checked codes again, no light yet, but all the same codes are pending again.
    Google searching today comes up with quite a few hits for this collection of codes, all pertaining to an issue with the evaporative emissions system. I was a career mechanic with GM for 16 years and had 5 years or so of the enhanced emission system fun before I left the trade. I am suspecting an issue with the charcoal canister and its associated devices including the vent valve, and vacuum pump. Based on past experience and reading I am aware that the vehicle runs an evaporative system test to check for leaks and system integrity after the vehicle has been off for approximately 5 hours. I am planning to purchase a used part on Ebay soon and then get the car on my rack to perform any diagnostics I can. In all my google searching most hits were for other Toyota models, but I thought I would check the forum here and see if anyone with a Gen 3 has encountered this issue yet. Any feedback would be appreciated.
     
  2. jdcollins5

    jdcollins5 Senior Member

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    The 2010 Prius DTC's for the above DTC's indicate a problem with the Evaporative Emission System, either a clog, high flow or a leak.

    The common trouble area for all of these DTC's are:
    - Canister Pump Module
    - Connector/Wire Harness (cannister pump module - ECM)
    - ECM

    I hope this will help.
     
  3. High Mileage

    High Mileage Active Member

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    If anyone is following this thread, or maybe it will help someone in the future. Since the original flagging of this code I have not seen the check engine light again and no pending codes have showed up. I have been through at least 5-6 drive cycles that should have resulted in time for this test to run after 5 hours of sitting. But I was still having issues putting fuel in the vehicle. So this weekend I got the car up on my rack and pulled the evap canister down. I performed tests from my manual to verify that:
    The vent valve operates properly when energized.
    The purge vacuum pump runs when energized.
    The path through the canister is clear and air passes to the proper areas when pressurized.
    What I did find it that there was quite a bit of water in the canister filter and the canister pump module. The water in the canister filter had saturated the cotton filter material and made it difficult to blow through the filter. I dried out the filter and blew all the water out of the filter and pump module and put everything back together. I will find out next week if that fixes the issue of difficulty adding fuel. I am not sure how the water got in where it does not belong, but here in California we have had a ton of rain and a lot of roads I drive have been partially flooded so I can only think that played a part in it.
     

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  4. wetback1

    wetback1 Junior Member

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    I realize this post is a year old but I’ve recently had the identical issue with my 2010 Prius. First the can’t fill tank issue and a day or two later code P2401, which I’ve cleared twice but keeps coming back. The car has 213000km on it.
    My question to High Mileage is was clearing the water from the filter material etc the solution to the problem? If so it’s a lot cheaper than replacing the charcoal canister. I live on Vancouver Island in British Columbia and it rains a ton here in the winter.
     
  5. High Mileage

    High Mileage Active Member

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    Wetback1, if you would like to send me an email to my account, [email protected] I will make contact with you and provide my phone number as I can tell you what I found. The problem occurred again late in 2016 with the first real amount of rain we had here in California. I would love to describe the repair here but it is pretty complex.
     
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  6. Grit

    Grit Senior Member

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    Complex fixes are always welcomed here, beneficial for everyone and be added to the knowledge base sections.
     
  7. High Mileage

    High Mileage Active Member

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    Grid, I will do my best, but its late tonight and I will need a few hours to get all the details into a response.
     
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  8. High Mileage

    High Mileage Active Member

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    So Wetback1 here is a semi brief description of the issue. The problem started in early 2017 according to my first post which was the first time California had any normal rainfall since I had purchased the car. The issue with the codes and inability to fuel the car were due to the water getting into the evaporative system. Once I removed the canister and removed all the water all the codes stayed cleared and I was able to fuel the car normally.
    The problem re-occurred in late 2017(I put 2016 in my last post, my mistake) after the rainy season started. I pulled the canister and again found water in the canister. I started tracing out the system for the vent as I assumed that had to be how the water was getting in. I found the canister is vented to an airbox behind the LR corner of the bumper, and then connects to a hose that routes to the top of the fuel filler neck. Wrapped around the top of the filler neck is a plastic housing that allows air in at the top of the filler neck, and also has a couple of small holes at the bottom of the same assembly to drain water.
    upload_2018-3-2_9-13-13.png
    Around and under the filler neck is a rock shield that I removed. It is #9 in the snip below.
    upload_2018-3-2_9-15-22.png
    When I removed the rock shield it was full of dirt and gravel. I drive a lot on dirt roads, and roads in the winter that are sanded or graveled for snow and ice. When I removed the rock shield it did not even occur to me that the amount of dirt and gravel was blocking the drain holes for the vent assembly. After I blew out the vent assembly and made sure the drain holes were clear I put the gravel shield back on. It was then I figured out that all that dirt and gravel was blocking the drain holes, and forcing the rain water into the vent line and eventually into the canister.
    So the short story is if you find water in the canister assembly you will need to dry it out.
    Once cleaned check the vent system for any broken or damaged lines.
    Then remove the rock shield and look for large amounts of debris that could be blocking the drain holes and forcing water into the evap vent system. Hope this helps you or anyone else.
    I have a good friend who has worked for Toyota for 15+ years and is awesome. He had never seen this issue before when I had contacted him. Possibly because he works in a large metropolitan area and most of those vehicles travel asphalt roads.
     
  9. Rdbrulz

    Rdbrulz Junior Member

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    I'm wondering if you can post information on how you pulled the canister and cleaned it? I'm dealing with an identical issue on a 2013 Prius C. I can clear the codes but they come back after a week and it all started after a gas station attendant left my cap off during a drive home in the rain. The car drives fine otherwise and I'm comfortable with, and have the tools to do the work myself. Is it relatively simple to remove it once getting under the car?
     
  10. James Elvidge

    James Elvidge New Member

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    I will try this as I'm having the identical situation and live on a dirt/gravel road. Thanks so much for taking the time to explain!
     
  11. James Elvidge

    James Elvidge New Member

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    I will try this as I'm having the identical situation and live on a dirt/gravel road. Thanks so much for taking the time to explain!
     
  12. Matt koele

    Matt koele New Member

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    2010 gen 3 Prius. This exact situation happened to me including the gravel blocking the vent holes After getting the vent clean and working to get all the water out of the lines, vapor canister,and evap ports, error came back. Not sure if I wasn’t able to dry out the evap canister enough or I damaged something when blowing things out. Thanks to high mileage for the great description and info. Might have to try to install a used evap canister next. Other ideas? Good sign is that I’m able to fill gas without it constantly clicking off.
     
  13. High Mileage

    High Mileage Active Member

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    Matt, if you did not take the canister apart then there may still be water inhibiting flow. There is a fabric filter of some kind in the canister that was saturated with water in my case. It may dry out over time if given the chance. You can PM me if you want. I had purchased a canister as a spare and have no need for it now that I sold the 2010.
     
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  14. tacopyro

    tacopyro Member

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    just wondering, do you think it would be possible to pull a vacuum on the canister to dry it out instead of cutting it up? assuming one has access to a vacuum pump?
     
  15. High Mileage

    High Mileage Active Member

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    Hi Tacopyro, this may be an option if you have the equipment. I was able to get my canister dry without cutting it up. I was able to use compressed air to blow out the filter and then give it overnight to dry out. But your idea about a vacuum chamber is very interesting.
     
  16. sliman

    sliman New Member

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    I own a 2015 Prius V. I realize this post is a year old, but I have the same codes namely, P2402, P2419, P043E, and P043F. I like to fix them. So, I looked for a repair manual, but I could not find it. does anyone know how we get a manual for this car or at least how I can remove/install/clean the vapor canister. I looked everywhere but I could not find it. Thank you!
     
  17. High Mileage

    High Mileage Active Member

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    Sliman, the canister is under the car, just in front of the fuel tank. You need the vehicle on a rack or safely supported with jack stands. There are not any detailed instructions for disassembling the canister since Toyota doesn't really expect it to be serviced. But if you have a reasonable mechanical aptitude I think you can figure out how to remove the canister and carefully remove the parts needed to access the fabric filter and dry out the canister. Also look at the other snips that are part of the post to look at the rock shield that is causing the issue. Please write back if you have other questions. Sorry I do not have a manual to share.
     
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  18. sliman

    sliman New Member

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    Thank you for your post.
    I supported the car with jack stands. I noticed that there is a big crack on the evap canister filter (Toyota 77746-47010)

    IMG_20220101_203211.jpg
    I attached the pics showing the crack. so, I am trying to remove the filter, but I have difficulties removing the hoses (shown on the pics).
    IMG_20220101_203235.jpg according to YouTube videos the hose has two tabs that should flex out of the way when you squeeze them. that did not work for me. Please, do you have any tips that will help me remove the hose
    Thank you.
     

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  19. High Mileage

    High Mileage Active Member

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    Hi sliman, the pictures you sent of Toyota 77746-47010 are of the "Vapor Canister". I would say that it should not be cracked, so getting that fixed is important. But there is no filter in there as I recall, it is just a plastic box of air. Once you get this handled you need to be looking at the evaporative canister which should be in front of the fuel tank and looks like the snip I sent. Much bigger and heavier, more hoses and wires attached. As far as removing the hoses you should be able to use a small screwdriver to help get the clips to push back out of the way while you are pushing the tabs to release it from the canister.
     

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  20. sliman

    sliman New Member

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    Thank you for your post and for the picture. I was able to take out the vapor canister and I ordered a new one. it will be here early next week. I will proceed as you recommended. Thank you again.
     
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