It's time that you replace all the underhood hose you can get to easily. Those hoses look severely aged, at least 2 cracks are visible in your picture. The correct diameter hose from PepBoys or Advance Auto will do, that's what I did.

 

I replaced the PCV valve hose after I put up this post.The first pic in this thread I replaced a few weeks back.You are absolutely correct with replacing them now & it was as easy as any job could be
Thanks engin_ear

 

Hope it's OK if I tag on to this thread. I have codes 0440, 0441, and 0446.

Do these indicate a similar culprit as you described above, the VSV?

 

I just think it's funny that people were posting that they replaced hoses when Mr Jokster said that having the two codes boils down to the purge control valve above the charcoal canister. I have this same problem and I'm hoping that I can do the whole job in one morning.

 

If anyone is familiar with removing this or has a pdf version or so that’d be dope
I’m going to attempt this valve in the canister soon

 

Wow Louie, 5 year old thread and you reply within a minute, that deserves an achievement or something.

But actually, I was reading up on P0441 and P0446 threads as I have the same codes every now and then, so I figured I try giving it another shot one of these weekends.

Mr. Jokster is correct that there is a valve above the charcoal canister (at least in the GS400). What I found is that there seems to be a good amount of confusion as to how many EVAP purge/control valves there are. If you look at other threads on this forum, one in particular (maybe others too), they say that the charcoal canister valve is the only one. But there is also an EVAP valve in the engine bay which may be worth the time to replace since it's easier to access. The engine bay EVAP valve is bolted onto the intake manifold on the right side. I've attached pictures of the parts, because I can't take pictures of their exact location right now.

I was planning on making a new thread to address the confusion as well as re-state a possible solution to the P0441 P0446 double whammy combo, but I think your sharp reply time is a sign to just put it all in this appropriately-titled thread (which also has Mr Jokster addressing an important reminder about fixing the cause of the problem, not the effects).

EVAP valve in the engine bay:



EVAP valve above the charcoal canister:

 

There aren't many videos on YouTube or threads on the internet on replacing the EVAP valve on the charcoal canister, unfortunately. There was one person that talked about replacing the valve on their GS 400, but I'm too lazy to go digging. I can say that I have heard other people say you can change the valve on the charcoal canister without dropping the axle, like Mr Jokster said. If I do it before you, I'll share it in here.

 

I was surprised to get a response 5 years later lol
I saw a video on YouTube where the rear crossmember (correct me if I’m wrong) or frame support was removed for access to the rear canister valve
I did replace the one on the engine as well as the hose
I am going to do a smoke test to look for leaks along the hoses as well

 

I guess if you have the same email then you still get notifications but a 1 minute delay in reply is pretty freaking fast.

I’m not sure what exactly needs to be dropped for access but dang you replaced the valve in the engine and still have the codes? That sucks, but it must be the canister valve.

 

As soon as we get a little warmer in NJ I’m going to attempt that canister valve job

 

Nice, good luck!

 

Any luck on this? Picked up a 2000 GS400 that has P0446 only. Trying to figure out what needs replacing to order the parts and take a stab at. Any help would be appreciated.

Thanks,
John

 

I haven’t done the job just yet
I do need to replace another hose under the engine cover shaped like a small U
I'm almost positive I have a leak there I want to address 1st & hopefully it’s my culprit