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P0440 code (Evap Malfunction) on 2001 Toyota 4Runner.

P0440 error code (Evap Malfunction) on 2001 Toyota 4Runner with 90K for miles and no previous problems at all. I had a free computer scan done at an auto parts store and had it reset hoping I had just not properly tightened the gas cap. But the lights came back on after a weekend of driving. I'm hoping it's not the charcoal canister like I've been reading about, because of the cost to have it fixed. Any suggestions what to do from here before I take it to a garage for further investigation?

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  • napendleton Sep 30, 2008

    Sorry the code is P0446

  • islandtested Feb 24, 2009

    I have the same problem. Any solutions yet?

  • marooneFool Apr 22, 2009

    I've been getting the same code for 5 months now. The charcoal canister was replaced the first time it appeared. The gas cap was replaced at the next come back to the dealer. In between, I bought an ODB II scan tool so I could check the code myself. Last time I had the car back in the dealer, the service advisor told me that the fuel pipe needs to be replaced.

    So, I went to another dealer (for a second opinion) and the tech told me that whoever replaced the charcoal canister messed up the leak detection pump which is a part of the charcoal canister assembly. I must now go back to the 1st dealer and i'll find out how it goes since the newly installed canister is still under warranty.

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SOURCE: 1996 Toyota Previa code p0441

P0441 is Evap Emission Incorrect Purge Flow; the repair you are describing is easy, and should correct the P0441 restricition...I would anticipate no large problems.

Posted on Oct 07, 2008

  • 2039 Answers

SOURCE: codes P0440 and P0300

the evap can simply be the gaz cap the 300 check for a good spark you may need wire and plug be carefull for those coil they offent defect good luck pierre

Posted on Jun 23, 2008

  • 7409 Answers

SOURCE: 2002 chevy trailblazer what does EVAP Emission

most p0440 codes are related to gas cap problem check cap and reset code if it the problem code pops problem with a fuel line follow lines from filler neck down and under vehicle[ look for smell of gas or cracked line] all the way up to throttle body if have leak fix asap

Posted on Sep 26, 2009

  • 19 Answers

SOURCE: toyota seinna po440, po441, po446

you have to understand that there is a leak in the system other than the gas cap for the evaporative system. The system needs to be professionally closed, and smoke introduced into to find the leak, and a through component check, eg.. purge valve vapor canister vent solenoid all functioning correctly

Posted on Sep 01, 2009

  • 7409 Answers

SOURCE: 2002 chevy trailblazer check engine code

most of the time your problem is going to be a bad gas cap if the cap is good check your fuel lines under the vehicle and under hood for a poss fuel leak or smell of gas [vapor]

Posted on Sep 24, 2009

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1 Answer

What are the probable causes for DTCs P0440 P0441, and P0446?


code p 0440 refers to EVAP system--system malfunction==causes --hose connections --intake leak---EVAP canister purge valve
code p 0441 refers to EVAPO system --incorect flow detected ====causes --hose connections ---intake leak---EVAP canister purge valve
code p 0446 refers to EVAP system---vent control--circuit malfunction====causes wiring---EVAP canister purge valve ---ecm
replace the purge valve
as to where it is , the location will be in the workshop manual or have a shop point it out to you.

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code p0440 refers to EVAP system malfunction==causes hose connections---intake leak---EVAP canister purge valve

check for vacuum leaks (vents -auto control-manifold-brake booster etc). Check for cracked /loose hoses on the tank/filler neck

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Hello there,my 2001 echo is lighting up trouble codes p0440 p0441 p0446; how and where should i start?


code p0440 refers to evaporative emission (EVAP) system--malfunction=== causes --hose connections --intake leak--EVAP canister purge valve
code po441 refers to EVAP --incorrect flow detected==causes the same as for po440
code po446 refers to EVAP system vent control --circuit malfunction===causes --wiring---EVAP can purge valve--ECM
generally I would replace the purge valve as it is common to all codes

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code p0441 refers to evaporative emission EVAP system-incorrect flow detected===causes hose connections--intake leak---EVAP canister purge valve
Po144 refers to the same fault and causes
Po446 refers to EVAP system--vent control-circuit malfunction===causes --wiring---EVAP canister purge valve---ECM In all cases codes the canister purge valve gets a mention and then the ECM. I would take it back and ask that the canister purge valve be changed or even ask for a new canister as there are occasions when filling the tank to the filler hole will induce fuel into the canister causing it to malfunction.

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Error Code: P0440
Fault Location:
Evaporative Emission (EVAP) System - Malfunction
Possible Cause:
Malfunction Indicator Lamp (MIL) active.
Soution:
Check Evaporative Emission (EVAP) System Sealing.
Check Evaporative Emission (EVAP) Canister Purge Regulator Valve .
Check Evaporative Emission (EVAP) Canister Purge Solenoid Valve .

Error Code: P0441
Fault Location:
Evaporative Emission (EVAP) System - Incorrect Flow Detected
Possible Solutions:
Check Evaporative Emission (EVAP) Canister Purge Regulator Valve .
Perform Output Test.
Check Evaporative Emission (EVAP) Canister Purge Solenoid Valve .
Check Evaporative Emission (EVAP) Canister.
Perform Basic Setting.
Check Pipes between Tank Breathing and Throttle Body.

Error Code: P0446
Fault Location:
Evaporative Emission (EVAP) System, Vent Control - Circuit Malfunction
Possible Cause:
Wiring harness.
Evaporative emission (EVAP) canister purge valve.
Engine control module (ECM).

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1 Answer

Code p0440 code p0441 code p0446on toy echo 2000 what is the diagnosis?


P0440 Evaporative Emission Control System Malfunction P0441 Evaporative Emission Control System Incorrect Purge Flow P0446 Evaporative Emission Control System Vent Control Circuit Malfunction
  • Remove and reinstall the gas cap, clear the code, and drive for a day and see if the codes come back.
  • Inspect the EVAP system for cuts/holes in tubes/hoses
  • Inspect for damaged or disconnected hoses around the Evap purge solenoid
  • Check and/or replace the sensor
  • Check and/or replace the purge valve
  • Have a professional use a smoke machine to detect leaks

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Error code P0446 is an Evaporative Control System vent control malfunction. DTCs P0441 and P0446 are recorded by the ECM when evaporative emissions leak from the certain components, or when there is a malfunction in either the VSV for EVAP, the VSV for
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