To the extent the *2004* FSM is applicable, trouble areas listed for 5VZ and code PO446 include:

- Fuel tank cap incorrectly installed
- Fuel tank cap cracked / damaged
- Vacuum hose cracked / holed / blocked / damaged / disconnected
- Open or short in vapor pressure sensor circuit
- Vapor pressure sensor faulty
- Open or short in VSV circuit for EVAP system
- VSV for EVAP faulty
- Open or short in VSV circuit for CCV system
- VSV for CCV faulty
- Open or short in VSV circuit for pressure switching valve
- VSV for pressure switching valve faulty
- Fuel tank cracked, holed, or damaged
- Charcoal canister cracked, holed or damaged
- ECM fault

 

We get those all day at work, Toyotas evap system is very senstive. First check and make sure your gas cap is on tight and the gasket is clean. Now pop the hood and check to make sure all the evap lines are on and non of the VSV (vaccum switching valves) are un plugged. If all looks good then you most likley need a new EVAP canister.

 

ZexTacoma, I have a 2003 2wd tacoma with 2RZ-FE engine and am showing a P0446 code. Could you describe exactly where the charcoal canister is . I remember them being rather large years ago but i don't see that on my truck.Thanks in advance for your help. Jamesburg71

 

(1) Welcome to CT! :waytogo:

(2) On a 2003 2RZ 5-lugger, the charcoal canister is located in the back, above the fuel tank. (See attached diagram)

 

http://library.motoralldata.com/all...625033/110767844/34853741/34857029/34857699/34872077/34858069/78795517/78795518

looks like this, its on the driver side behind the battery

 

Make sure you guys dont have an aftermarket locking gas cap. These are notorious for causing the P0446 code.

 

your in Hawaii dude. no smog checks, every car or truck i had when i grew up there got every piece of emission garbage gutted the first week i had it

 

ahh! interesting... :thinking:

 

I forgot to add one more thing. I had a 99 Corolla that would throw the P0446 code every so often. I checked the entire EVAP system and couldnt find a thing. I discovered that when I filled up the gas tank until the pump would click off I would get the code right away. But when I would put just enough gas to fill it up but not all the way full the code would not come on.