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2002 TOYOTA 4RUNNER SR5 4X4 3.4 LITER. tROUBLOE CODE OF

Customer Question
PO446 JA: Just to clarify, what's...
2002 TOYOTA 4RUNNER SR5 4X4 3.4 LITER. tROUBLOE CODE OF PO446
JA: Just to clarify, what's the exact code? And have you tried to reset it?
Customer: I did reset it twice
JA: Are you fixing your 4Runner yourself? What have you tried so far?
Customer: new gas cap
JA: Anything else you want the mechanic to know before I connect you?
Customer: is there a charge?
JA: You just pay a $5 deposit now and the rest only when you get a reply from the Toyota Mechanic. All of this is 100% satisfaction guaranteed, so you can get a refund if you're not happy for any reason.
Customer: thanks anyway, trouble shooting on my own for now.
Submitted: 1 year ago.Category: Toyota
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Answered in 3 minutes by:
10/4/2016
Toyota Mechanic: Skyvisions, ASE Certified Technician replied 1 year ago
Skyvisions
Skyvisions, ASE Certified Technician
Category: Toyota
Satisfied Customers: 14,517
Experience: Toyota Master Diagnostic
Verified

HAs there ever been any other code set with the P0446 code? Do you have the definition of the code or do you need that too?

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Customer reply replied 1 year ago
No just the code po446 and yes I know what P0446 code definition. P0446 is an OBD2 diagnostic trouble code that indicates a fault within the evaporative emission control system. Other EVAP system codes may be seen with P0446.
Customer reply replied 1 year ago
No email is fine. I just bought this a month ago and no codes were evident and still wouldn't have stopped me from buying it. Its runs perfect and looks perfect until after owning this for a few weeks and then po446 came on.
Toyota Mechanic: Skyvisions, ASE Certified Technician replied 1 year ago

More specifically this code P0446 indicates there's a problem with the vent valve or CCV which stands for close canister valve. This is a control valve that is mounted on the left inner fender well near the brake master cylinder there is also a purge valve located there too. The reason why the 446 code sets is because it sees a leak detection when it runs a vapor pressure test and it controls that valve to close. Either the hoses are off or missing or the valve itself is not opening and closing. You can test the solenoid with battery voltage and ground to make sure clicks if you don't have an active testing scan tool otherwise it is difficult to accurately diagnose evaporative emission systems without a smoke machine and a pressure tester for the EVAP system.

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Customer reply replied 1 year ago
Do you think its the cannister or no it sounds like. You think its a vacuum leak?
Customer reply replied 1 year ago
I guess it would be prudent to take to the dealer for them to test the CCV
Toyota Mechanic: Skyvisions, ASE Certified Technician replied 1 year ago

If you live where heat is an issue it's possible could be a problem in the canister if all the hoses are intact and no cracks or leaks which normally would cause a P0 440 code to set along with the 446 code it is likely the close canister valve or CCV. It will allow air to pass through it only once opened or closed. You can apply voltage and make sure the seal inside the valve is working and in fact the valve itself is clicking. It's cheaper to just replace that versus paying someone to diagnose it. The canister is a lot more expensive. Unless you can find a dealer to do a correct evaporative emissions test to give you 100% diagnosis but is very difficult to find quality diagnosticians in the shop.

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Customer reply replied 1 year ago
I live in Maryland and it gets hot in the summer but the temperature has come down significantly since August, so I would say I live in a hot state 2-3 months a year. So you think going at it from the valve stand point is better place to start?
Customer reply replied 1 year ago
Ok I'll give that a shot and see what happens. thx.
Toyota Mechanic: Skyvisions, ASE Certified Technician replied 1 year ago

Sorry had to step away from my computer for a bit that is correct just replacing the bow may be cheaper than paying some diagnose this and could solve the problem. If you have not done so please do not forget to rate the information that I provided you at three or higher.

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