I purchased a CanOBD2 code reader to see what the codes are so I can look into repairing the problem myself. The gas mileage may be off a bit but the car otherwise starts, runs, and drives normally at all speeds and under all conditions. The gas cap used to have pressure but now it doesn't, and I always make sure the cap is sealed properly (three ''clicks''). My friend used to drive it and he had a tendency to overfill the tank so it may have triggered the codes. The gas cap is the stock Toyota unit and I've never had it pressure tested. I don't want to replace it unless it's defective.
Since only 441 and 446 codes are present I'm thinking there's a bad valve/switch in the evap canister but wanted to check here first. How much of a job is it to repair this problem? I don't have a service manual so perhaps someone could post a diagram or direct me to a site where I could purchase a manual on the cheap since my budget is really tight right now.
Thanks sincerely for your help. :)
MOST OF THE TIME ITS NOT THE CANISTER BUT RATHER WHAT THEY CALL A "VSV" OR VAACUUM SWITCHING VALVE LOCATED ON THE CANISTER. EITHER WAY, ITS A BIT OF A PROJECT
I don't see any rust around the filler neck or inlet pipe. Is the canister like that on the Corollas--near the gas tank? I don't have a lift so I can't get under the car. I have car ramps that I can use but there's a few inches of snow on the ground (I live in ME).
I've done rather extensive work on cars (I have an Assoc Degree in Auto Tech from Cleve, OH, though I'm a computer tech by trade) so an involved project wouldn't bother me as long as I don't need any "special" OEM tools. I could save a lot of money and being on a strict budget, that would really help.
Would a bad vsv valve cause a loss of pressure in the gas tank? As mentioned, there's no pressure when removing the cap.
SOURCE: 99 Camry, P0441 & P0446 codes
A. Diagnostics for PO441:
1. Remove Vacuum Hoses between EVAP VSV and Charcoal Canister and discard.
2. If there is a metal vapor pipe between EVAP VSV and Charcoal Canister, clean inside of vapor
pipe
3. Replace EVAP VSV and Charcoal Canister assembly with new parts.
4. Install new vacuum hoses between EVAP VSV and Charcoal Canister.
B. Diagnostics for P0446:
1. Inspect vacuum hoses and pipes between EVAP (Purge) VSV and Charcoal Canister for leaks.
2. Replace Vapor Pressure VSV and Canister.
NOTE :When performing diagnostics for an occurrence of a MIL "ON" condition, Diagnostic
Trouble Code (DTC) P0441 may be result of debris in Evaporative Emission Control System. This
may cause blockage of a vapor line, or a stuck VSV, as described in troubleshooting area of Repair
Manual.
Robert
Repair open or short in voltage feed circuit to Purge Solenoid.
Repair open in PCM purge command circuit.
Replace purge Solenoid.
Replace vacuum switch.
Repair restriction in Evap line or canister or soleniod.
Repair resistance in purge connector.
Replace PCM.
for p0442
Remove and reinstall the gas cap, clear the codes, and drive for a day and see if the codes come back.
Otherwise, replace the gas cap, or
Inspect the EVAP system for cuts/holes in tubes/hoses.
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The above Solution #1 post was meant to be a comment/question, not a solution. I forgot to login beforehand. Sorry guys.
my email is northernlight_95 at yahoo dot com
Toyota_Ed: Thanks so much for the PDF--that was just what I was looking for. Now I just have to wait until the weather breaks and get my hands dirty. :-)
I'll have to recommend FixYa to my friends. All the comments were prompt and helpful.
Can I get the manual? I have P0446 issue on a 1999 Camry LE 4 cyl.
Have cleared the codes several time
gumnaam00 at gmail
I have a 99 lexus es300 my check engine light is on as well as the trac off light.. I have replaced the charcoal canister as well as all the 02s, the gas cap, the vsv located on top of the manifold, and have scanned all of the vacuum lines the best as i possibly could i have reset the computer after each replacement and still cannot get the light to go off... my car is two months overdue for inspection and i have now received two tickets does anyone have any suggestions?
HI There:
I have a Toyota Corolla, Year 1999, and have 165000 KMs on the vehicle.
The Engine light is ON on the dash board. I scanned it and gave the codes as: P0441 and P0446.
What should I change on the vehicle, any advise is greatly appreciated.
My email address is: [email protected]
Thanks in Advance
99 Camry 4cyl. Auto
Stalling and bogging down on acceleration
Plugs and wirest already replaced recently
Codes PO441 & PO446
Garage say replace 3 way vsv and Charcoal Canister.
Are these both together under the car by gas tank?
Do they come together as Part OEM 77740-06091
Fuel tank charcoal vapor tank?
Would it be take off bolt up and plug in fix?
Thank you in advance
[email protected]
Post your e-mail address; I'll send you the diagnostic tree PDF
Before you do anything, remove the gas cap, and inspect the fuel filler neck, where the cap fits. Observe closely for rust. Please respond what your observations are.
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