Question about 1999 Toyota Camry
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
Posted on Nov 27, 2008
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.
Posted on Dec 01, 2008
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
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
Posted on Jan 29, 2009
Tips for a great answer:
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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.
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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