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HELP With Trouble Code P0440

Hope someone can help me out here. My vehicles 'Engine' light came on yesterday and a friend of mine hooked up his Diagnostic Scanning Tool and checked for Trouble Codes. There was one Trouble Code and it is listed below:

ERROR Code P0440 "Evaporative Emmission Control System Incorrect Purge Flow"

Can someone pls explain what this means and wheter this code is the reason the 'Engine' light came on? What do I need to do in regards to this situation. The car in question is a 2002 Toyota Corrola

Thank you for any response Winston

Reply to
Winston
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In news:BYzOb.15597$ snipped-for-privacy@newsread2.news.pas.earthlink.net, Winston being of bellicose mind posted:

Is your gas cap screwed on TIGHT? Failure to build a very slight, measureable vacuum in the tank while driving can set off this code.

Reply to
Philip®

Yes this code will cause the check engine light to come on. In fact it's the number one cause of check engine lights coming on. Most common cause is a loose or non-factory gascap. Make sure the cap is OEM and tight, disconnect the battery for a minute or two to clear the code. If the light comes back on with the same code the evap system needs to be checked for integrity and all the control valves checked for normal operation. Best take it to a dealer for diagnosis, it's a complicated process.

Reply to
Steve S.

In news: snipped-for-privacy@posting.google.com, Steve S. being of bellicose mind posted:

Instead of disconnecting the battery, is there no longer a single fuse you could pull (like the BRAKE light fuse) to accomplish the same memory clearing?

Reply to
Philip®

Winston,

As Steve said it is a complicated process to check out the EVAP system but it can be done and at a substantial cost savings if you are so inclined. I have a 2000 Corolla and just had an EVAP system problem that set off codes

0440, 0441 and 0446. As several people have pointed out the gas cap is the first culprit. Please note that the 2000-2003 1.8L Corolla engines have been known to have the fuel pressure sensing switch on the EVAP charcoal canister go bad. This is what happened to me. If after trying the gas cap the light comes back on let me know and I will help you out with the troubleshooting and or replacement of the various sensors on the system. For piece of mind the switch that went bad for me was $60 via internet mail order and about 2 hours labor on my part as compared to a $300 dealer repair.

Good luck, Scott

Reply to
Scott

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