Join Date: Jan 2010
Location: Fountain Valley California
The fuel cap still could be the source of the fault code (even thou it looks OK). I've never had a problem, so I'm not sure what a cap might look, and or feel like if it were going south on you. What's flunking is that the car (after starting), will tell the purge valve to open an the vent valve (at the canister) to close. That will allow engine vacuum to enter the tank. The ECM monitors the fuel tank pressure sensor voltage to verify that the system is/was able to reach a predetermined level of vacuum within a set amount of time. Since you do not show any codes that would say that any of the components failed to move, or monitor the vacuum level, you have to believe that all that action was OK. But a purge valve could move (from closed to open) as requested, but still have an internal problem an prevent any or a limited amount of vacuum to reach the tank. Or the same thing could have happened to the canister vent valve (moving from open to close) an allow that vacuum to be dumped overboard (instead of trapping it in the tank). If the purge line (from the engine, back to the tank was plugged in any way) you would be in trouble. Maybe you could eliminate a plugged line by removing the gas cap an the line going back towards the tank (from the purge valve), an make sure that low pressure air can easily get thru it. Or maybe you had a touch of bad luck an your fairly new purge valve decided to call it a day internally. Course I could be putting to much into this. If so, I apologize.