On the 2001 Toyota Echo, The P0440 is set when there is an emissions leak from the components, or when the vapor pressure sensor malfunctions.
P0441 and P0446 are set when there is an emissions leak from the components or a problem with the VSV for EVAP, VSV for Canister Closed Valve, or in the vapor pressure sensor itself.
So- best place to start here is by having the EVAP System “smoked”. This is where a machine forces smoke through the system and any leaks can be more easily found and repaired.
If the smoke test proves no leaks, test the VSV’s:
VSV for EVAP: 27 – 33 ohm
VSV for CCV: 25-30 ohm
If the VSV’s check ok, then the Vapor Pressure Sensor will need to be replaced.
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