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I have a 2001 Sienna and havs the P0446 code. What

I have a 2001 Sienna and has the P0446 code. What does it mean?

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Although the code is supposed to tell you that a VSV electrically operated valve (about $40) on the front of the charcoal canister (at the rear of the fuel tank under a plastic cover) is bad, ours was not.
We had one of the diaphrams break in one of the air operated valves actually on the charcoal canister ($325!)

Always make sure your gas cap is good (and tight) before trying to fix this problem. We have a page on the fix - with pictures,
http://www.findonefindall.com/toyota-sienna/toyota_sienna_evap_P0446.htm

Hope it helps!

Posted on Aug 30, 2009

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Evaporative emissions control vent circuit low http://wiki.answers.com/Q/What_does_OBDII_code_P0446_Evaporative_emissions_control_vent_circuit_low_mean


Posted on Jun 20, 2009

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P0446 Evaporative Emission Control System Vent Control Circuit Malfunction The code P0446 is set when the engine computer recognizes a fault or restriction at the vent control part of the Evaporative emission control system (EVAP). The description of the fault varies between different car manufacturers, but one thing is common, the code P0446 doesn't directly point to a defective part; some testing might be required to pinpoint the faulty component. What can cause the code P0446: - faulty vent control valve - blockage at the vent hose, vent filter or vent control valve - open or short in the vent control valve circuit - bad charcoal canister - EVAP system leak - faulty EVAP system pressure sensor - bad vacuum switching valve (VSV) - stuck open purge valve (solenoid)

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P0446 Evaporative Emmission Control System Vent Control Circuit OBD-II Trouble Code Technical Description

Evaporative Emission Control System Vent Control Circuit Malfunction
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Causes A code P0446 could mean one or more of the following has happened:

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I have a problem with my 2001 Toyota sienna, took it to inspection yesterday to get inspected and didn't pass results Cat not ready and evap not ready, inspector tell us run the car couple miles and bring...


If the "evap not ready" readiness monitor never clears and you keep getting P0440,P0441,P0446 type codes, then you have a problem with the evap system. You have already tried the gas cap (good start) but there are about 6 other things it can be from electrical VSV air valves (there are 3 of them, 2 under the hood, 1 near the charcoal cannister (behind fuel tank) to 2 air operated valves on the front of the same cannister. There is also an air line that goes to one of the electric VSV valves on the air cleaner under the hood. Several oil change places have been guilty of pullling these off and not reconnecting them.
We have a page with pictures of our experience,

http://www.findonefindall.com/toyota-sienna/toyota_sienna_evap_P0446.htm

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That code is for the evaporative emmisions system. Here is a link to an open forum you can go to, this will help you understand what it is, and why. The vehicle on the site is a van, but the code, and parts involved are one in the same, so don't worry about the difference in vehicle. The van is a toyota, and this is the information on the p0446 code. Hope this helps you.
http://steampunkworkshop.com/toyota-sienna-evaporative-canister-and-svs-valve-repair

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