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P0440 TOYOTA – Evaporative Emission Control System Malfunction
Possible causes
Missing or loose fuel cap
Incorrect fuel filler cap used
Fuel filler cap remains open or fails to close
Foreign matter caught in fuel filler cap
EVAP canister or fuel tank leaks
EVAP system hose leaking
Fuel tank leakingTech notes
The P0440 code means that the control module has detected a leak in the Evaporative Emission (EVAP). Loose fuel tank filler cap is the most common cause that triggers the P0440 code.There is a factory service bulletin for the following Toyota models:
2003–2004 Toyota Corolla
2003–2005 Toyota Matrix
Toyota Factory Service Bulletin OBDII Code P0440 Corolla and MatrixIf P0440 is combine with P0446 and P0441 use this bulletin:
2000-2003 Toyota Solara
2000-2003 Toyota Avalon
2000-2003 Toyota Camry
2001-2003 Toyota Sienna
Toyota Factory Service Bulletin OBDII Code P0440 Solara, Avalon, Camry, Sienna
What does this mean?
When is the code detected?
Malfunction is detected when EVAP control system has a leak, EVAP control system does not operate properly.
Possible symptoms
Engine Light ON (or Service Engine Soon Warning Light)
Possible a noticeable fuel odor caused by the release of fuel vapors
P0440 Toyota Description
The Engine Control Module (ECM) tests the Evaporative Emission (EVAP) system for the following conditions:– Large and small leaks
– Excess vacuum
– Purge flow during non-commanded conditions
– Fuel Level and Fuel Pressure sensor faults
– EVAP Purge and Vent Valve faults
The ECM monitors the Fuel Tank Pressure sensor in order to determine the level of vacuum/pressure in the EVAP system. The ECM commands both the EVAP Purge Solenoid and the EVAP Vent Valve ON when the conditions are met in order to apply an engine vacuum to the EVAP system. The ECM commands the EVAP Purge Solenoid OFF once the system has reached a predetermined level of vacuum. This test verifies if a vacuum can be achieved in the EVAP system. Failure to develop a vacuum may be caused by a large leak or a restriction.
Hope this helps more then likely it’s your charcoal canister or your purge solenoid or your vsv valve
Here is a few diagrams should be under car near gas tank hope this helps let me know if I can assist you with anything else good luck
Thank you for your info.
Would you please upload a large image? The one you uploaded is too small. I have a general idea which is which. But I would like to see it clearly.
I am planning to plug the smoke after the green cap(service something). Will the canister solenoid closed or open if the car key is not inserted to create a closed environment?
The environment will be closed with key on and open with key off let me try to find a better photo for you
The video is a link to show were its located
All the diagrams I have are blurry for some reason 2000 to 2003 year models for camry were the same for evap systemYou can run smoke from virtually any of the hoses attached to the evap system each hose will show you different locations if the system is correctly sealed and you see nothing them there isnt a leak next step would to check each valve the the egr and the vsv and the vsv stands for vacuum switching valve still searching for better schematics
One more great video to show what the major problem could be with the p0440 code please let me know if you still need schematics
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