I have a 2003 Toyota Tacoma 4wd with a 4cyl 2.7 liter engine. I have been throwing the following codes for awhile.
P0446 (Evaporative Emission System Vent Control Circuit)
P0441 (Evaporative Emission System Incorrect Purge Flow)
P0442 (Evaporative Emission System Leak Detected)
the P0446 is then repeated a second time
I understand something is wrong with my EVAP system meaning the gasoline vapors are not being fed back into my system because of a leak or a bad purge/shut valve, etc. I have replaced the gas cap and inspected the lines visually for leaks.
I am hoping that with the specific codes, and the information that I only throw the codes when the temperature is above 50 degrees, that someone can point me towards the most likely problem or tell me how I can test the valves without paying for a smoke test. I read something about using a multimeter to trip the valves open and closed, how can I test if they are doing this correctly.
Thank you for any information!