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Toyota 4runner misfire code P0446. - 2001 Toyota Tacoma

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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jschoon77
  • 55 Answers

SOURCE: p0440,p0441,p0446

These codes are all for the Evaporative Emissions System.

P0440- Evaporative emissions system fault- just saying there's something wrong with the system.

P0441- Evaporative emissions system- Incorrect purge flow- saying that the system isn't purging the raw fuel vapors (hydrocarbons- HC) as well as it should.

P0446- Evaporative emissions system- Control valve circuit low- there is a valve, usually located on the charcoal canister at the rear of the vehicle, that opens to allow fresh air to enter the evaporative emissions system as the engine vacuum purges the fuel vapors from the charcoal canister and closes when purge is not needed to prevent leakage of those fuel vapors to the atmosphere (HC is a greenhouse gas and is regulated as such by the fed gov't).

Given that you have the incorrect purge flow code and the control valve code together, my bet is that the vent control valve has failed (causing the P0446) and is not opening to allow fresh air into the system to displace the air from within the system that is being pulled to the engine. Since you have no fresh air entering the system, the engine will pull a vacuum on the system instead of the vapors "flowing" into the engine (causing the P0441).


I hope that this is helpful to you!!!


ASE Master Technician with L1 and X1 Certifications; Nissan Scope Technician; Chrysler Level 3 Silver Technician- 12+ years experience.


Posted on Nov 17, 2008

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  • 1861 Answers

SOURCE: 1998 toyota camry V6

P0420 indicates you have a catalyst efficiency issue; replacement of the Air-Fuel Sensor should take care of that;
The P0441, P0446 and (I assume P0440); you said 446 twice, indicates a faulty or loose fuel cap; it is not sealing properly.
Please feel free to respond to me if you have any further questions.
A FixYa rating from you regarding my assistance would be greatly appreciated.

Posted on Dec 27, 2008

awcforever
  • 359 Answers

SOURCE: toyota camry 1997 3.0 v-6 code p0446

That code is for the evaporative emmisions system. Here is a link to an open forum you can go to, this will help you understand what it is, and why. The vehicle on the site is a van, but the code, and parts involved are one in the same, so don't worry about the difference in vehicle. The van is a toyota, and this is the information on the p0446 code. Hope this helps you.
http://steampunkworkshop.com/toyota-sienna-evaporative-canister-and-svs-valve-repair

Posted on Mar 08, 2009

  • 160 Answers

SOURCE: misfire on number four engine code

YOU MAY WANT TO TRY NEW WIRES TOYOTA SAYS 5 YEARS IS AVERAGE LIFESPAN / FACTORY WIRES ARE YEAR DATED

Posted on Apr 19, 2009

  • 7353 Answers

SOURCE: Code P0441 and P0446. What does it mean?

Both codes are with the EVAP SYSTEM, there are numerous items it could be. A repair shop that does Toyotas or the delaler would be the best to check it out for you. Its not anything that will leave you walking or disable the car.

Posted on Nov 13, 2009

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