01 Camry P0441 adn P0446

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Old 21 Oct 2005, 01:21 pm   #1 (permalink)
Camrygirl
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Default 01 Camry P0441 adn P0446

Ok guys, this gets more interesting. My CEL Light came on again so please
bear with me as I explain what is going on.. I have a 01 Camry 2.2L 4 cyl.
I live in Texas and it has CALIFORNIA emissions! Imagine that!


When I got mine decoded the first time, it came up with several....

P0171 System Too Lean, Bank 1
P0420 Catalyst System Efficiency Below Threshold
P0440 Evap Control System
P1130 Air-Fuel Sensor Circuit Range/Performance


I replaced the Air Fuel/Ratio Sensor and cleared the codes. I drove around
for about a month, and this morning the CEL Light came on again. When I got
it decoded this is what I got

P0441
P0446

Now, I understand that these are in relation to evap leaks. Could it be my
gas cap again? My Toyota buddy looked at my car this morning, and he was
able to touch my catalytic converter. The car had been running about 20
minutes at the time, and I KNOW YOU CAN'T touch a cat if it is operating
properly as they get extremely hot.

Now, he is telling me that I need to go ahead and replace my cat, which I
am going to do, but what is weird is that it is not showing the P0420 code
that the cat is operationg below threshold. Could a bad cat cause these
P0441 and P0446 codes? He did tell me that one of the codes (I can't
remember which one) is related to my evap canister. Can anyone tell me
where this is located? Can you clean them and replace them?

I know this buddy really well, and I know he would not steer me wrong when
it comes to the cat. He isn't even going to charge me to put it on. (Its
nice to have friends like that )

So, any suggestions?

Thanks a bunch for any help! I apologize if this has been answered
before!




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Old 21 Oct 2005, 06:53 pm   #2 (permalink)
qslim
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Default Re: 01 Camry P0441 adn P0446

441 and 446 are evap related only, your catalytic converter doesn't enter
in to this equation.
These codes may very well point to a leak in the charcoal canister,
but there may also be a leak at the canister closed valve (CCV) or in the
hose that connects the two. The valve is located (I think) on the air box
under your hood, with a hose disappearing under the firewall on the driver
side. These codes can be triggered by something like the hose just being
loose also.
Find someone who is familiar with the 'Late Type' evap monitors on
these Toyotas. It's an obtuse system prone to problems, so have someone
competent actually test things before you go throwing parts on. Those
canisters are expensive!

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Old 25 Oct 2005, 12:44 am   #3 (permalink)
johngdole@hotmail.com
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Default Re: 01 Camry P0441 adn P0446

See that's the problem when you install Denso oxygen sensors instead of
the first-in-class Bosch.

Now actually qslim is right. EVAP system is complete separate from the
exhaust emissions system. But there are a lot of problems with the
newer generation of evap system components like you have there, such as
bad check valves and spewing carbon that plug up vacuum valves. In the
worst case the canister needs to be replaced.

But before that it's most likely that the EVAP VSV (near the air
cleaner housing) is becoming sticky and now allowing full purge flow
(or allowing unchecked flow at all times).

Simplest case: EVAP VSV

To check, I'd pull the hose on the canister side of the EVAP VSV. With
the engine running, you should hear the valve cycle on and off and
drawing a good breath each time. A MityVac should show several inches
of vacuum instead of a couple.

If you only see a couple in/Hg or no vacuum, the valve is stuck closed.
If you get 10+ inches of vacuum at all times, then the valve is stuck
open.

In either case, before you replace it, try cleaning by carefully prying
open the metal "fingers" that hold the plastic end cap with ports on
it. Carefully clean off the parts and use a little lube on the piston.
Don't crack the plastic or break the metal fingers in the process. Then
completely clamp the fingers back for a tight seal. In most cases this
should save the VSV.


qslim wrote:
> 441 and 446 are evap related only, your catalytic converter doesn't enter
> in to this equation.
> These codes may very well point to a leak in the charcoal canister,
> but there may also be a leak at the canister closed valve (CCV) or in the
> hose that connects the two. The valve is located (I think) on the air box
> under your hood, with a hose disappearing under the firewall on the driver
> side. These codes can be triggered by something like the hose just being
> loose also.
> Find someone who is familiar with the 'Late Type' evap monitors on
> these Toyotas. It's an obtuse system prone to problems, so have someone
> competent actually test things before you go throwing parts on. Those
> canisters are expensive!


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