P0440 Toyota EVAP Canister Purge Regulator Valve

P0440 Toyota EVAP Canister Purge Regulator Valve

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 leaking
Tech description
The P0440 Toyota 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 Toyota code.
What about the obd code?
Malfunction is detected when EVAP control system has a leak, EVAP control system does not operate properly.
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.

Toyota Vehicle:Toyota Prius,Toyota Celica,Toyota Supra,Toyota Carina,Toyota Camry,Toyota MR2,Toyota Aygo,Toyota 4Runner,Toyota Avalon,Toyota Camry,Toyota Corolla,Toyota FJ Cruiser,Toyota Highlander,Toyota Land Cruiser,Toyota Matrix,Toyota Prius,Toyota RAV4,Toyota Sequoia,Toyota Sienna,Toyota Solara,Toyota Tacoma,Toyota Tundra,Toyota Yaris,

1 Reply to “P0440 Toyota EVAP Canister Purge Regulator Valve”

  1. Very informative. Just a little help with testing parameters on valve and solenoid would be an added bonus, to keep us away from the stealer.

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