the3rsss Posted August 14, 2011 Share Posted August 14, 2011 OK...After a new head gasket timing belt etc, im left with an annoying p0446 code. I went to the junk yard and picked up a canister, and both rear solonoids. Just started working on this and here is what i found. The factory wire that supplies 12v to the rear solonoids is dead. someone ran 12v from another source. If i understand this code correctly it is only electrical. There has to be a short or open in the circuit. Further, the ecm controls the solonoids via a ground, the 12v is always on. So troubleshooting, i should have battery voltage with the car in start, from the solonoids back to the ecm. So troubleshooting should not be so bad. Questions....Am i correct in my assumption that a clogged hose, leaky vac line etc has nothing to do with this code? What are the names of the three solonoids? In the rear, i have a large square solonoid, a smaller round solonoid. I tested both and they work with batt voltage. Iput junkyard parts in and still have code. Will the front solonoid throw this code? Do you test the front (under the intake runner) in the same manner as the rear. Will anything else throw this code?. And if I chase batt voltage from the solonoids back to the ecm is it safe to assume the open or short is in the ecm as it is not completeing the circuit? Dont want a wild goose chase Link to comment Share on other sites More sharing options...
the3rsss Posted August 16, 2011 Author Share Posted August 16, 2011 Anyone? Link to comment Share on other sites More sharing options...
the3rsss Posted August 24, 2011 Author Share Posted August 24, 2011 Well, no one helped me with the p0446 code. I chased my tail for hours on that one. Here is where I stand now. And let me say this right now. If no one replies I swear to god ill start a " which oil is best for my subaru" thread I had no voltage at pin ten at the ecm with koeo, so I replaced the wire from the ecm back to the drain valve. The valve was getting 12v and worked fine just the ecm didn't see the voltage. I got a junkyard ecm and poor! No p0446. The valve worked and off I go. Now , after about 50 miles, I have a p0440 code. This code never showed up on the old ecm. Can't even get much info on it. Gas cap? Pressure issue? Help. Don't make me start an oil thread! Link to comment Share on other sites More sharing options...
ShawnW Posted August 25, 2011 Share Posted August 25, 2011 No leaks in the fuel filler neck? Link to comment Share on other sites More sharing options...
the3rsss Posted August 25, 2011 Author Share Posted August 25, 2011 being a northeast salt belt car, and seeing that just about everything under the car has a layer of rust on it, i expected the worst when looking under the plastic cover at the filler tube. It looked fine! still had grey paint and very little rust. I suspect it had been replaced. checked all the hoses while down there and nothing looks brittle or loose. I know the drain valve is working. could it be the solonoid valve above the canister( I think its called a solonoid valve, subaru has a million names for these things, its round kinda small and has vac tube running to it along with wireing) I never messed with that. Link to comment Share on other sites More sharing options...
the3rsss Posted August 25, 2011 Author Share Posted August 25, 2011 gas cap?? Looks ok?? never any pressure when i take it off. Link to comment Share on other sites More sharing options...
Olnick Posted August 25, 2011 Share Posted August 25, 2011 gas cap?? Looks ok?? never any pressure when i take it off. Someone correct me if I'm wrong, but the gas cap should hold pressure--you should hear that little whoosh of air when you unscrew it. Link to comment Share on other sites More sharing options...
ShawnW Posted August 25, 2011 Share Posted August 25, 2011 Depends on temperature and such. It would be a cheap thing to try. Link to comment Share on other sites More sharing options...
the3rsss Posted August 25, 2011 Author Share Posted August 25, 2011 I picked up a napa( stant) cap. Took a close look at the stock gaskets and there is a good size crack in it. I just swapped the rubber gaskets. Cleared the code. Waiting to see what happens. I have heard this code can be a royal pita. Link to comment Share on other sites More sharing options...
Snake River Posted August 25, 2011 Share Posted August 25, 2011 When I worked in the dealership I saw this problem several times, the system should be closed and anything that allows the system to detect a leak can set the code. I realy saw it when people went to aftermarket locking gas caps. Link to comment Share on other sites More sharing options...
the3rsss Posted August 27, 2011 Author Share Posted August 27, 2011 Ahhhhhh!!! Replaced the filler neck. Looked like new at the bottom, totally rusted out at the top. Got a beautiful one at the junkyard. 20 bucks. Now it won't take gas! No cel, but it took ten min for me to put 20 bucks in it. God, I just can't seem to win! Link to comment Share on other sites More sharing options...
the3rsss Posted August 29, 2011 Author Share Posted August 29, 2011 The code is back! Dug a little deeper and the filler tube, yeah the one that looked new on the bottom, was totally rotted out up top. I picked up a real good used one at the junkyard on fri and put that in. I replaced all the rubber hoses to the filler neck. Drove all day sat and sun . Thought I finally got it. Guess what? It's back? Any ideas? All the hoses look good. Would that solonoud valve cause this code? Link to comment Share on other sites More sharing options...
the3rsss Posted September 2, 2011 Author Share Posted September 2, 2011 I hope I'm onto something. Found a cracked vacuum hose at the purge control valve at the intake manifold. However, I don't seem to be getting any vac at idle. how do you test this valve? Where is it and what does it look like? Link to comment Share on other sites More sharing options...
jamesm113 Posted November 11, 2011 Share Posted November 11, 2011 I hope I'm onto something. Found a cracked vacuum hose at the purge control valve at the intake manifold. However, I don't seem to be getting any vac at idle. how do you test this valve? Where is it and what does it look like? The valve should default to closed. If you apply 12V to it, it will open. Link to comment Share on other sites More sharing options...
the3rsss Posted November 11, 2011 Author Share Posted November 11, 2011 Wanted to wrap this thread up. I pressurized the system with ten lbs of compressed air. Lowest my compressor would go. I heard it hissing right away. It was leaking at the rollover valve. This is located on the fillerneck top. Replaced valve and code was gone. I put the hoses on backwards and it wouldn't take gas. Switched them around and the light has been off a month and takes gas fine. A happy ending. Link to comment Share on other sites More sharing options...
CNY_Dave Posted November 16, 2011 Share Posted November 16, 2011 An effective method, but one I would be cautious using. Oddly it's one of those things safer to do with a full tank rather than a partial tank. That said, I may pursue this method for tracking down the cause of my p1443 code. Dave Link to comment Share on other sites More sharing options...
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