Question about 1998 Toyota Corolla

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Problem whit evap sistem corolla 98

The check engine ligh is on and the test say cod 446, I change the vsv in the charcoal canister but the light is on again. I need know how probe the vps and the hoses diagram.

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  • Anonymous Mar 14, 2014

    check engine light on dealership said need new charcoal canister would this have anything to do with engine revving up (rpm)



1 Answer

You may need to change the actual charcoal canister that is what turned my check engine light off..

Posted on Sep 24, 2008


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2 Answers

Circuit fault 2000 camry P0446

P0446, This is a EVAP code,check the gas cap is the seal torn?Do you tighten the gas cap properly,If there is a circuit problem this will reside in the CCV (canister closed valve),VSV (pressure switching valve),or a disconnected hose at the charcoal canister,if anything just replace the gas cap first,clear the code and go from there

Aug 11, 2012 | Cars & Trucks

1 Answer

The check engine light is on. the scan reads 441 and 445

1st. Make sure your fuel filler cap is tight, clean, and sealed well.
These are codes set when there is a fuel vapor leak.

P0441 EVAP Control System Improper Purge Flow.
P0446 EVAP Control System Vent Control.

This indicated a problem with the evap emission control system. This is the part of the emission controls that captures gas vapors in the tank, stores them temporarily in a charcoal canister, and then burns them by "purging" the charcoal canister into the intake.

Could be something as simple as a loose or faulty gas cap. Can also be vacuum lines for the purge valve and canister or a bad purge valve itself.

This code is infamous code, its a bit complicated if not mechanical incline, I would recommend finding an of duty Toyota mechanic to do a side job. There are plenty of those guys will do side work and will save you big bucks, however you will have to asked around when you get the next oil change. any repair manual will have proper instructions. same time, purge valve is either bad or clogged. i'd, also, clean EGR valve.

the cannister is mounted in the rear underside of car above the rear crossmember,you either have to remove the exhaust or lower the rear crossmember to gain access to the charcoal cannister.. there is also a vsv valve that mounts on the air cleaner housing.
these would be the 2 common items that can set these codes although there can be other issues that can set the codes you have
most of the testing is done with a scan tool . and vacuum pump there are a few test to do with a voltmeter.

Nov 22, 2011 | 2005 Toyota Corolla

1 Answer

My corolla 2001 the engine light is on test by computer show po446 problem

P0446 Evaporative Emission Control System Vent Control Malfunction
 Vacuum hose cracks, holed blocked, damaged or disconnected (1), (4), (5), (6) and (7)
 Open or short in vapor pressure sensor circuit
Vapor pressure sensor
 Open or short in VSV circuit for vapor pressure sensor
 VSV for pressure switching valve for vapor pressure sensor
 Charcoal canister cracked, hole or damaged
 Fuel tank over fill check valve cracked damaged

Aug 30, 2011 | Toyota Corolla Cars & Trucks

3 Answers

My 2002 toyota sienna has evap system malfunction p0440, p0446 changed the canister closed valve vsv, check engine light came back yesterday trying to avoid replacing vapor canister which is costly but do...

You are on the right track, you replaced the vent valve and replaced the vsv valve in the engine compartment that should of solved the problem as long as the correct valves were replaced, i would check for a leak in a hose for the evap system, a smoke test would be a good way, the canister may not be the problem but the valves on the canister, there are a few vsv valves on the canister and also the pressure sensor, the switching valve is very common also, there are so many valves thats why the dealer replacing the canister as an asm, hope this helps also make sure gas cap is good.

Jan 07, 2011 | 2002 Toyota Sienna

2 Answers

Hello my 2000 toyota echo's check engine light is on and it is reading error codes po440,po441,po446 I was told it is something with the emissions what is the problem

It's probably the 02 sensor (technically dealing with the exhaust) which will make it fail emissions. I have been told it may also be a dirty mass air flow sensor, which is located in the same housing as the air filter box. I am having the same problems myself, and the car is hesitating and has no power.

Aug 24, 2010 | 2001 Toyota Corolla

2 Answers

Check engine light came on my 2002 Rav 4. Auto Zone diagnostic code PO446. How should I fix?

Chances are, it's going to be either 1 of the 3 switches that need replacing, a new gas cap or a new charcoal canister. The 2 switches under the hood are the VSV for CCV and VSV for EVAP. The one at the canister itself is the VSV for VSP. This VSV for VSP typically goes bad before the other 2 switches do. Plus, the switches are much cheaper than a new canister. (BTW, VSV stands for vehicle switching valve.)

PO446 is an evap canister code

Oct 28, 2009 | 2002 Toyota RAV4

3 Answers

Evaporative Emmission System Malfuction----p0446

Possible leaks, clogs, malfunctioning VSVs (vacuum switching valves), and faulty Evap charcoal canister. This system is designed to remove harmful vapors in the fuel system and preventing these vapors to enter the atmosphere, regulate fuel pressure, by sending it into the combustion chamber to be burnt.

Diagnostics for P0446:
1. Inspect vacuum hoses and pipes
between EVAP (Purge) VSV and
Charcoal Canister for leaks.
2. Replace Vapor Pressure VSV and

Hopefully this helps

Aug 16, 2009 | 1998 Lexus Gs 400

2 Answers

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


Jan 29, 2009 | 1999 Lexus ES 300

1 Answer

Check engine ON related with evap sistem corolla 2003

By the way you are explaining your problem sounds like you have either a bad or no oxygen sencers. Charcoal type substance is what is inside of your cattilitic converter

Nov 04, 2008 | 2003 Toyota Corolla

1 Answer

Engine light keeps coming on

The P-0440, P-0441 and P-0446 indicates that you have a leak in the "fume" side of the system. Normally, seeing a 440-441-446 is a loose or defective fuel cap. One would NOT change the evap VSV for a 440-441-446 set of codes. At this point, I agree with you regarding the trust issue. Regarding the caisiter, I cannot speculate yes or no, without further info/codes/etc from your dealer, but, I have replaced several over the past few years; this "could" be true....

Oct 14, 2008 | 2001 Toyota Corolla

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