P0440, P0441, P0446 '03 Corolla CE
in [Toyota Camry]
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From: wilsonfamily2004 on 21 Jul 2007 19:50 Can anyone offer an explaination to the diag codes I received that are causing the Check Eng light to come on in my car? I am ready to get dirty if I can get some guidance on what to replace and how. I just sold my other car and have another kid on the way...can't a brother catch a break? -phrogdriver
From: qslim on 21 Jul 2007 20:47 A brother can catch a break by knowing that these three codes don't have anything to do with how the car runs mechanically, and barring an state emissions test could stay on indefinitely without any driveability issues. Who cares about evaporative fuel emissions? But anyway, the evaporative emissions system is responsible for making sure that no fumes from the gas tank get into the atmosphere. It does this by taking said fumes, storing them in a charcoal canister, and at certain times while you are driving releasing them into the engine's intake to be burned, thus ensuring sparkling rivers and streams for future generations. Besides the obvious "check the gas cap" these three codes indicate a malfunction somewhere in the evap system, which is fairly complicated and can't effectively be diagnosed over the internet. Hell, half the "technicians" out there either reset the light and say it's fixed, or toss a vacuum switching valve or charcoal canister at it and hope it doesn't come back. So, if these are the only three codes you have, I wouldn't be terribly concerned. You should find someone competent with OBDII systems sometime, and if you put it off for any length of time, recheck the codes periodically to make sure that there aren't any others popping up. As far as getting into it yourself, the obvious causes for these three codes would be a loose gas cap or a disconnected vacuum hose near the air box. Give it a good look, post if you have any other questions.
From: Hachiroku ハチロク on 21 Jul 2007 22:20 On Sat, 21 Jul 2007 20:47:04 -0400, qslim wrote: > A brother can catch a break by knowing that these three codes don't have > anything to do with how the car runs mechanically, and barring an state > emissions test could stay on indefinitely without any driveability issues. > Who cares about evaporative fuel emissions? Um, Al Gore...?
From: Hachiroku ハチロク on 21 Jul 2007 22:23 On Sat, 21 Jul 2007 20:47:04 -0400, qslim wrote: > A brother can catch a break by knowing that these three codes don't have > anything to do with how the car runs mechanically, and barring an state > emissions test could stay on indefinitely without any driveability issues. > Who cares about evaporative fuel emissions? *I would reset the ECU...gee, come to think of it, I *DID* reset the ECU on my Tercel...frequently! It would run great for 2 startups, then throw the codes and drop about 5 MPG...until I reset the ECU again. The last thing I did before I sold it was to clean the ports on the vacuum-connected sensors, and clean/replace the vacuum lines. I ran it for two weeks without throwing a code, and then sold it so I could buy my Supra...goodbye, 45MPG, hello VR-O-O-O-O-OOOOOOOOOMMMMMM!
From: qslim on 21 Jul 2007 23:21
Actually yeah, that's the one thing I guess I left out. When it comes to evap codes sometimes its worth resetting the system and seeing if the code comes back. I remember a few instances where for the life of me I could not find anything wrong with the system, and the code never re-appeared after I reset it. Ghost in the machine.. |