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Old 09-27-2013, 03:00 PM #1
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P0446 Solutions Anyone?

Got the CEL, VSC TRAC, and VSC OFF lights. Codes show to be P0440, P0441, and P0446. There's a lot of info about the P0446 out there. I'm looking for solutions ONLY from people who have corrected the problem legally. We have annual inspections that are required so I cannot bypass anything or ignore it.

I know the gas cap thing is not the solution. Is the replacement of the charcoal canister a likely solution?

I read that someone corrected their issue by replacing a filler pipe in bad condition. My filler pipe is in great condition. However, I cannot fill up by just leaving the pump nozzle in my filler pipe. I have to hold it at a specific angle at least 75% of the time. This now is my wife's vehicle and she said she has topped off the fuel tank in the past. Once she realized where I was going with the questioning she said she hadn't done it in at least 6 months. Through powers of factoring for what she says and what she means, she probably topped it off last week. Yet I digress. If topping off was the cause, will time correct the problem assuming no more topping off problems? Any ideas are much appreciated. Thanks.
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Old 09-27-2013, 03:17 PM #2
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My 440 code was solved by replacing the vacuum switching valve at the canister. It was stuck open.
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Old 09-27-2013, 03:36 PM #3
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Quote:
Originally Posted by TX4Running View Post
Got the CEL, VSC TRAC, and VSC OFF lights. Codes show to be P0440, P0441, and P0446. There's a lot of info about the P0446 out there. I'm looking for solutions ONLY from people who have corrected the problem legally. We have annual inspections that are required so I cannot bypass anything or ignore it.

I know the gas cap thing is not the solution. Is the replacement of the charcoal canister a likely solution?

I read that someone corrected their issue by replacing a filler pipe in bad condition. My filler pipe is in great condition. However, I cannot fill up by just leaving the pump nozzle in my filler pipe. I have to hold it at a specific angle at least 75% of the time. This now is my wife's vehicle and she said she has topped off the fuel tank in the past. Once she realized where I was going with the questioning she said she hadn't done it in at least 6 months. Through powers of factoring for what she says and what she means, she probably topped it off last week. Yet I digress. If topping off was the cause, will time correct the problem assuming no more topping off problems? Any ideas are much appreciated. Thanks.
Straight from the ol' tech archives. Basically data collected from techs that have seen the same combination of codes, the diagnosis, and the number of times each item was verified as the correct repair.

Pretty telling since you have the exact 3 codes!

Vehicle Application:

1999 4Runner 3.4 2003 Sequoia 4.7
2000 4Runner 3.4 2000 Solara 2.2
2001 4Runner 3.4 2000 Solara 3.0
2002 4Runner 3.4 2002 Tacoma 3.4
2004 4Runner 4.0 2003 Tacoma 3.4
1999 Camry 2.2 2004 Tacoma 3.4
2000 Camry 2.2 2003 Tundra 3.4
2000 Camry 3.0 2004 Tundra 3.4
2002 Sequoia 4.7

Customer Concern:
Engine runs, but the Malfunction Indicator Light (MIL) is on with codes P0440, P0441 and P0446.

Average Reported Mileage:
112049

Tests/Procedures:

1. Verify that the Vacuum Switching Valve (VSV) for the pressure sensor (located on the canister) operates correctly. This is a normally closed (N.C.) valve. When energized, it should open. When de-energized, an internal spring should close the valve.

2. Verify that the canister closed valve (located on the air filter housing) closes and does not stick closed when operated. This is a normally open (N.O.) valve. When it is grounded, it closes, and it should never stick closed.

3. If both solenoids operate correctly and are not sticking, inspect for a restriction in the Evaporative Emission (EVAP) lines that could affect how the canister vents after a leak test is performed.

4. Verify that the fuel cap is a factory part. If the fuel cap leaks or does not hold the correct amount of vacuum when the system checks for a leak, all the codes will set.
Tech Tips:
If possible, use a scan tool to turn these two solenoids on and off. This is a good way to test the operation of the internal drivers of the Engine Control Module (ECM) and the wiring harness. Refer to Toyota TSB #EG005-01 and #EG013-03 for additional information on the EVAP system operation.

Diagnostic Codes
P0440
P0441
P0446

Confirmed Fix
83 - Charcoal Canister
29 - Fuel Filler Cap
18 - Evaporative Emissions (EVAP) Vacuum Switching Valve (VSV)
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Old 09-27-2013, 04:04 PM #4
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I've got the 440, 442 and 446.
I have already replaced the evap canister and the VSV.
After those didn't solve the problem, I took it to the dealer for a diagnostic.
They say it's a valve and a cracked hose on top of my gas tank.

If you want to save a lot of money trying to hunt this down, take it to a dealer for a diagnostic. Only cost me about $70 to find out what it was after spending $500+ in parts trying to figure it out myself.
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Old 09-28-2013, 06:20 PM #5
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ScanTool Recommendations

EatonKyle,
What OBDII scanner would you recommend? I've been looking at Actrons and Innovas but find negative reviews for everything. Is it possible to use a scanner to force specific valves open and closed to prove if one is the problem?

Also, as for a diagnostic test at the dealer, will they tell me the exact part that is the problem for a relatively low cost ~$70? I've read plenty of posts on here where the dealers are throwing darts at the board hoping one will eventually be the fix.
Thanks.
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Old 09-29-2013, 01:19 PM #6
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Quote:
Originally Posted by TX4Running View Post
EatonKyle,
What OBDII scanner would you recommend? I've been looking at Actrons and Innovas but find negative reviews for everything. Is it possible to use a scanner to force specific valves open and closed to prove if one is the problem?

Also, as for a diagnostic test at the dealer, will they tell me the exact part that is the problem for a relatively low cost ~$70? I've read plenty of posts on here where the dealers are throwing darts at the board hoping one will eventually be the fix.
Thanks.
Honestly most generic scan tools fall pretty flat when it comes to bidirectional controls (being able to command specific components on/off with the scan tool). Most of the more capable generic tools (all makes/models) I use are extremely expensive... such as the Snap-on Verus, Solus, and so on.

I'd recommend going straight for the Toyota TIS Techstream. It is the dealer/Toyota specific OE scan tool and is PC based. Rarely can you get dealer diagnostic equipment at a reasonable price but the TIS has seemed to be an exception. Look it up on Ebay. It's the software on CD and a specific USB to OBDII connector. If you need help with it, it's a pretty popular topic over in the 5th gen section.

A dealer or reputable independent shop should be able to diagnose it for you and hit the nail on the head the first time. Expect to pay 80-100+ for diagnostic charges. If you pay them to diagnose it I'd recommend also paying them the whole way...for parts and labor as well. This way if it does not solve your issue the first time you have a better platform to argue that they were wrong and should work with you. Providing your own junk yard or aftermarket part to them or repairing it yourself after they diagnosed it leaves room for a ton of excuses on their end if your codes were to return.

Good luck and hope this info helps!
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Old 09-30-2013, 07:06 PM #7
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Smile p0446

on my 98 with the 446 code, I cleaned all three switches, put clamps on vac lines that i could get to and cleaned and lubed the gasket on the fuel cap. so far 689 miles later no cel. knock on wood.
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Old 03-31-2017, 08:04 AM #8
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Quote:
Originally Posted by EatonKyleH View Post

2. Verify that the canister closed valve (located on the air filter housing) closes and does not stick closed when operated. This is a normally open (N.O.) valve. When it is grounded, it closes, and it should never stick closed.
)
Could someone describe the location of this valve to me? I just removed my intake to install plugs and tires and clean my MAF, and afterward threw this P0446 [Evap Circuit]. Given the work I did, this seems like a reasonable start.

Last edited by Lindenwood; 03-31-2017 at 09:18 AM.
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Old 03-31-2017, 12:09 PM #9
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I've been hunting down mine, 2002 4Runner, for a couple months now.

Tried a new OEM gas cap, no fix.
Replaced charcoal canister with a used one, no fix.
Next up is the overfill check valve on the gas tank. Hoping that will fix it, just have to drop the gas tank to fix it. Reason I believe this will fix it is because I've gone to fill up a few times and the pump always stops after a few seconds when filling up. Pretty frustrating.

Most people say don't worry about it (i have an ultragauge so I turn the code off anytime it comes on), comes on 2-4 times a week now. But that bothers the hell out of me and I can stand having to keep turning it off. We don't have emissions testing here in KY so that's not a problem, but my OCD is haha.
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Old 03-31-2017, 01:53 PM #10
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Quote:
Originally Posted by Noshirtganshirt View Post
I've been hunting down mine, 2002 4Runner, for a couple months now.

Tried a new OEM gas cap, no fix.
Replaced charcoal canister with a used one, no fix.
Next up is the overfill check valve on the gas tank. Hoping that will fix it, just have to drop the gas tank to fix it. Reason I believe this will fix it is because I've gone to fill up a few times and the pump always stops after a few seconds when filling up. Pretty frustrating.

Most people say don't worry about it (i have an ultragauge so I turn the code off anytime it comes on), comes on 2-4 times a week now. But that bothers the hell out of me and I can stand having to keep turning it off. We don't have emissions testing here in KY so that's not a problem, but my OCD is haha.
I am the same way! I recently got one of those VeePeak devices to clear my codes and play with other OBD2 functions. But, I hate having the light on and I hate knowing something is wrong with my truck.
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Old 03-31-2017, 04:13 PM #11
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I tried replacing the valves but in the end I had to replace the whole canister.
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Old 03-31-2017, 04:20 PM #12
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P0440 Fixed!
here's a great write up on the check valve on top of the tank.
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Old 03-31-2017, 05:01 PM #13
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i replaced the complete canister and that solved the issue. i bought an OTC brand obd scanner that has a lot of features and works great.
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Old 03-31-2017, 08:40 PM #14
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Bottom line is it's a complex system with no easy fixes. You have to troubleshoot it to find the issue, or just randomly throw parts at it until the code goes away.

Start by removing the charcoal canister, checking the VSV there and pressure testing the canister for leaks. There's a seam running around one end of the canister, sometimes develops a small crack. People have had luck smearing RTV or whatever all around that seam.

If that's all in order your best bet is to do a smoke test on the whole system. There's all sorts of hoses and connections, any one of which could be leaking. Smoke test should point out the problem areas.
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Old 04-01-2017, 01:52 PM #15
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So. If you are one to top off your fuel tank you're going to get this code. Overfilling on a 3rd gen will get fuel into the charcoal can. Don't buy a new charcoal can. Cover EVERY seam with JB weld. Install and let the code fix itself. You can plug up all ports but one on the can and induce a vacuum and see if it holds negative pressure. If it doesn't then you have cracks which you can JB weld. If it DOES hold negative pressure I'd move to checking the 2 VSVs on the can with the 9v method. This charcoal cans are super expensive for a carbon filter.


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