I own a 2002 Toyota Camry - 4 cylinder engine. My wife went to Auto Zone and the error codes they found were: P440, P441, P446. We are going to try another gas cap, try that. Does anyone have any solution(s) for me? Based from what I could find, previous owners were having trouble either putting gas into the car and/or problems starting the car. Our car starts great, runs normally, other then it's showing that it's a 7 years old vehicle. If anyone has any solutions, that would be outstanding!
I am not going to lie, I came across this in another forum a while back and I would love to retype it and interpret it here but it is too much. I looked at it and verified that the information here is information that could be found through my scan tools so here it is!
P0440
The fuel tank
pressure is atmospheric pressure after the vehicle is driven for 20 min (2 trip detection logic).
Possible Problems
Fuel tank cap incorrectly installed <= Most common
Fuel tank cap cracked or damaged (Toyota part only)
Bad vapor pressure sensor/circuit
Vacuum hose cracked, holed, blocked, damaged or disconnected
Hose or tube cracked, holed, damaged, or loose
Fuel tank/filler neck cracked, holed, or damaged
Charcoal canister cracked, holed, or damaged (collision)
In above description, check hoses between vapor pressur sensor and VSV for vapor pressure sensor and charcoal canister. Also, hose between charcoal canister and fuel tank.
P0441 and/or P0446
Possible Problems
Open or short in VSV circuit for vapor pressure sensor
VSV for vapor pressure sensor
Open or short in vapor pressure sensor circuit
Vapor pressure sensor
Open or short in VSV circuit for EVAP
VSV for EVAP
Vacuum hose cracks, hole, blocked, damaged or disconnectedÂ
Charcoal canister cracks, hole, or damaged
(P0446 is not normally associated with a loose or non-sealing gas cap. A loose or non-sealing gas cap triggers P0440)
1. Check the VSV connector for EVAP, VSV connector for vapor pressure sensor and vapor pressure sensor connector for looseness and disconnection
2. Check the vacuum hose between intake manifold and VSV for EVAP, VSV for EVAP and charcoal canister, charcoal canister and VSV for vapor pressure sensor, and VSV for vapor pressure sensor and vapor pressure sensor. Check these hoses for correct connection, looseness, cracks, holes, damage, and blockage.
3. Check voltage between terminals VC and E2 of ECM connector (4.5-5.5 V). (replace ECM if faulty)
4. Check voltages between terminals PTNK and E2 of ECM connector while applying vacuum to vapor pressure sensor (2.9-3.7 V).Â
If faulty, check for open and short in harness and connector between vapor pressure sensor and ECM. If ok at this point, replace vapor pressure sensor.
If voltage above is ok, Check VSV for EVAP. When ECM terminal EVP is grounded (ignition "ON"), Air should flow in pipe E (inboard on tube) on VSV and out F (outboard on tube) on VSV (Don't use high pressure air for this test). When EVP is not grounded, air does not flow in E and out F.
5. Check operation of VSV for EVAP. Remove VSV from engine. Check that there is continuity between the two terminals (30-34 ohms). If there is no continuity, replace VSV for EVAP.
Check that there is no continuity between either terminal and body. If there is continuity, replace VSV for EVAP.
Check that air does not flow from inner port (E) to outboard port (F).Â
Check that air flows from port E to F when you apply battery voltage across terminals. If no air flows, replace VSV for EVAP.
6. Check the vacuum hose between intake manifold and VSV for EVAP, and VSV for EVAP and charcoal canister. Check as above.
7. Check for open or short in harness and connector between EFI main-relay and VSV for EVAP and ECM. If faulty, repair or replace harness or connector. If ok, check and replace ECM.
8. Check VSV for vapor pressure sensor. When ECM terminal TPC is grounded (ignition "ON"), Air should flow in pipe E (inboard on tube) on VSV and out F (outboard on tube) on VSV. When TPC is not grounded, air flows out G (outside of connector).
If ok, check and replace charcoal canister.
If not functioning correctly, check function of VSV for vapor pressure sensor. Remove from engine.Â
Check that there is continuity between the terminals (33-39 ohms). Replace the VSV if there is no continuity.Â
Check that air flows from port E (inboard in tube) to port G (side of connector).
Check that air flows from port E to port F (outboard in tube) when battery voltage is applied across terminals. Replace VSV if function is incorrect.
9. If good, Check the vacuum hose between charcoal canister and VSV for vapor pressure sensor, and vapor pressure sensor and VSV for vapor pressure sensor - check as above.
11. Check for open and short in harness and connector between EFI main replay and VSV for vapor pressure sensor and ECM.
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All the codes you posted are definitely for the evaporative emission system. Try tightening the gas cap first and have the codes cleared with a scan tool. You can leave the codes the way they are and drive the vehicle, it may take a few hours of driving for the Evap system to run its tests and clear the code if the is no problem. Gas cap seals are known to leak. The evap system is in place to not allow gasoline vapors to escape . The sytem will pull your gas tank into a vacuum and burn the vapors in the engine. If the gas cap trick does not work, you may have a wiring or evap line problem. A repair shop will put smoke from a machine into the system and check for leaks.
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