2015 Kia Soul + which has a P0441 Evap incorrect purge flow code diagnosed by a DIY.
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2015 Kia Soul + which has a P0441 Evap incorrect purge flow code diagnosed by a DIY.
Visit my website at www.schrodingersboxqm.com for more videos and training!
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I've seen enough EVAP videos for armchair confidence to grow, so it was more than a little humbling one day when it turned out to be more difficult than I expected. Modern cars have several check valves in the system that will change results depending on whether you apply positive or negative pressure during testing. What makes things worse is the way manufacturers may not explain the system well enough in service data for one to use logic to make a diagnosis. Instead they offer a cookbook sequence of tests they expect you to perform without fully understanding.
Apology accepted, I hope my boss will be as understanding when my terrets kicks in. GROUNDS, definitely a GROUND, gotta check the GROUNDS, ya, gotta watch Judge Wopner at 5:00.
The techs that have attended our training classes on evaporative system diagnostics would have done 90% of the testing from the front seat of the car with the scan tool. They would not have shot gunned any parts. One of the first things we break down is what exactly a DTC is. The answer to that question is it is the identification number of a test that a computer has run that has failed. The next thing we work on is finding out how did the computer run the test in question and then we study and practice how we can test the exact same way that the computer does. This system as you realized does not use the pump to pressurize the cannister and fuel tank, Kia has gone away from DMTL and now is using a system that is exactly like GM and Ford. There are a number of manufacturers that have followed that same strategy. That of course means we can test every one of these cars the same way. With the incorrect purge flow code the testing would be with the engine idling, monitor the purge valve duty cycle and the fuel tank pressure sensor. With the vent valve open and no purge command the tank and cannister should be at atmospheric pressure. When the purge valve is commanded on, even with the vent valve open a very slight vacuum should appear in the fuel tank. With the purge valve turned off and closing the vent valve with bidirectional controls the fuel tank should remain at atmospheric pressure or should slightly start to rise in pressure. The one thing that it should NOT do is go into a vacuum. If you see the vacuum building, this is the first thing you would need to do outside of the car, disconnect the purge valve electrical connector. Open the vent valve to bleed any vacuum off of the tank and cannister and then command the vent valve closed again. If it goes into a vacuum again, then the purge valve is bad.
I'd try blasting brake cleaner thru it while clicking it on and off.
Your approach was just fine Matt. I have a little different approach for various reasons on Evap systems. Start with the purge to see if its leaking. If its good or bad you then have a great place to smoke the rest of the system. If purge is bad, there is still the possibility of a leak in the rest of the system. Once final repair is done, a lot of the scan tools have an evap system test you can run the car through to confirm repair and prevent comebacks.
I have never worked on a KIA, so…
Great diagnosis most people would change gas cap like you said indeed great work
I didn't think the GROUND thing was so out of line. In fact I thought the GROUND thing was damn entertaining but then I don't live in the unGROUNDed corporate world. Keep doing what you do and keep your feet on the GROUND.
G R O U N D lmao !
LEAKING PURGE VALVE,