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First of all I would like to start by saying hello my name is Liam and I'm new here this being my first post unfortunately. I own a small shop in queens NY with a small but grate customer base. I would like to say this site has been grate on giving me some insight into how other shops run and conduct day to day operations. I would like to say thank you for that and I hope to contribute in the future. now let me tell you about my issue with this car.

 

A good customer of mine has a 2001 Hyundai Electra. The vehicle is in grate condition always takes care of what needs to be done. Over the past 3 weeks the check engine light has come on a number of time throwing p0455. we have smoke tested it each time passing with flaying colors the ball is pined right to the bottom. checked the purge valve working grate. so we conducted a evap system test using the versus. now ether the test passes. or the test closes the vent valve and pulls a vacuum on the system then 25 sec into the test the ecu opens the vent valve before the test is done. vacuum drops and sets the p0455. its not the CVV but the ecu itself opening the ground circuit. I've never seen a ecu/pcm fail in this way.

my question to you is why? do think the ecu is faultily?

 

Thank you

liam

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P0455 is an evap large leak, I've really only seen this when a gas cap has failed or the large evap line on the tank. The small evap lines won't cause this fault.

 

Oh yeah, another possible cause is a tank that has a leak as it will not hold pressure.

Edited by phynny
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It's usually doing that because the ECM is seeing that it can't pull a vacuum. I've sen the canister come apart, plug the purge valve and it can't draw a vacuum so it throws that code.

 

Read your SI, that system uses vacuum, smoke won't help you. Test it correctly and read the code set criteria. Look at your scanner and see what's not within spec and go from three.

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  • 11 months later...

fixed it... chased my tail for awhile over thinking it. ended up being an extremely same leak in one of the evap lines. But I feel it's placement was key, right at the tank pressure sensor. Witch on this car is right over the rear sub-frame and has a small rubber line that goes into the top of the tank. Even once I found It I had to look very closely to see the smoke leaking out. The vehicle has been repaired for awhile now no light returned. Sorry for the slow reply completely forgot to post the out come

thanks for the replies

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fixed it... chased my tail for awhile over thinking it. ended up being an extremely same leak in one of the evap lines. But I feel it's placement was key, right at the tank pressure sensor. Witch on this car is right over the rear sub-frame and has a small rubber line that goes into the top of the tank. Even once I found It I had to look very closely to see the smoke leaking out. The vehicle has been repaired for awhile now no light returned. Sorry for the slow reply completely forgot to post the out come

thanks for the replies

You weren't slow with your reply.......it was only 11 months!!! But thanks for letting us know!!

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  • Have you checked out Joe's Latest Blog?

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      I recently spoke with a friend of mine who owns a large general repair shop in the Midwest. His father founded the business in 1975. He was telling me that although he’s busy, he’s also very frustrated. When I probed him more about his frustrations, he said that it’s hard to find qualified technicians. My friend employs four technicians and is looking to hire two more. I then asked him, “How long does a technician last working for you.” He looked puzzled and replied, “I never really thought about that, but I can tell that except for one tech, most technicians don’t last working for me longer than a few years.”
      Judging from personal experience as a shop owner and from what I know about the auto repair industry, I can tell you that other than a few exceptions, the turnover rate for technicians in our industry is too high. This makes me think, do we have a technician shortage or a retention problem? Have we done the best we can over the decades to provide great pay plans, benefits packages, great work environments, and the right culture to ensure that the techs we have stay with us?
      Finding and hiring qualified automotive technicians is not a new phenomenon. This problem has been around for as long as I can remember. While we do need to attract people to our industry and provide the necessary training and mentorship, we also need to focus on retention. Having a revolving door and needing to hire techs every few years or so costs your company money. Big money! And that revolving door may be a sign of an even bigger issue: poor leadership, and poor employee management skills.
      Here’s one more thing to consider, for the most part, technicians don’t leave one job to start a new career, they leave one shop as a technician to become a technician at another shop. The reasons why they leave can be debated, but there is one fact that we cannot deny, people don’t quit the company they work for, they usually leave because of the boss or manager they work for.
      Put yourselves in the shoes of your employees. Do you have a workplace that communicates, “We appreciate you and want you to stay!”
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