Question about 2001 Toyota 4Runner

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Evap system malfunction

89 4-runner w/95 3.0L V-6
2 problems both related
1st fuel was pouring out of the frame. Lower hose from canister on passenger fenderwell was shoved inside frame and has obviosly been cut with a knife. This is where the fuel was coming from. On the top of the canister is a purge vacuum line and a line going to the fuel tank.
2nd problem. fuel tank seems to be pressurized
relationship? the pressurized tank seems to be forcing fuel back to the canister.

question(s)
what is causing the tank to be pressurized?
why is fuel travelling the wrong way through the evap system return line?
will I need a new canister and vsv?

Thanks!
Matt
DarkMatter@3dup.com

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No, actually, this just means that you have a back pressure that should not be, my suggestion is, to remove the hoses form the canister and buy a set of rubber plugs, these can be found in the help section of the auto store, plug the ends of the lines and it should solve the problem, some times the canister will get over filled iwth charcoal and make this happen.

Posted on Nov 26, 2008

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"I have 1998 Volvo V70 AWD and my check engine light is on. I changed gas cap that one I got from the Volvo. Also I done smoke test few days ago, the mechanic couldn't find any leak. Now it show the code...


1--Evap system hoses
2--Purge Valve
3--Check Valve
4--Air pump
5--Canister valve(some people call canister purge valve)

A crack in an evap hose is the most common thing. I would definitely check the two evap canister hoses. These are easy to fine, one being the J hose, which is in a J shape, and connected to your canister and the other end to a valve. Then the Canister Evap hose, which is 18" or so long with a 4" L on the end of it. It connects to a hard plastic or metal hose that can easily be reached by removing the rear passenger side tire on a 98 S70 turbo. Check these 2 first. I found that the cracks in both of these hoses were where the clicks were or close to them(many old style clips causing this). Check these too, again they will both be connected to the canister valve that is right beside the charcoal canister on the passenger rear side.

Jun 13, 2014 | 1998 Volvo V70

1 Answer

Whats code p1441


Hi there:DTC P1441 - EVAP System Flow During Non-Purge




CIRCUIT DESCRIPTION
The evaporative system includes the following components:


The fuel tank.
The EVAP canister vent valve.
The fuel tank pressure sensor.
The fuel pipes and hoses.
The fuel cap.
The EVAP vapor lines.
The EVAP purge lines.
The evaporative emission canister.
The EVAP purge valve.


The Powertrain Control Module (PCM) supplies a ground to energize the valve (purge ON). The EVAP purge valve control is Pulse Width Modulated (PWM) or turned ON and OFF several times a second. The duty cycle (pulse width) is determined by engine operating conditions including load, throttle position, coolant temperature and ambient temperature. The duty cycle is calculated by the PCM and the output is commanded when the appropriate conditions have been met. The system checks for conditions that cause the EVAP system to purge continuously by commanding the EVAP canister vent valve ON and the EVAP purge valve OFF (EVAP canister vent valve CLOSED, EVAP purge PWM 0%). If vacuum level in the fuel tank increases during the test, a continuous purge flow condition is indicated. This can be caused by any of the following conditions:


EVAP purge valve leaking.
EVAP purge and engine vacuum lines switched at the EVAP purge valve.
EVAP purge valve control circuit grounded. If any of these conditions are present, DTC P1441 will set.


CONDITIONS FOR SETTING THE DTC


No Throttle Position (TP) sensor, ODM, IAT sensor, or MAP sensor DTCs set.
The DTC P0442 diagnostic test has passed.
A continuous open purge flow condition is detected during the diagnostic test (fuel tank pressure decreases to less than -11 in. H20).


ACTION TAKEN WHEN THE DTC SETS


The PCM will illuminate the Malfunction Indicator Lamp (MIL) during the first trip in which the diagnostic test has been run and failed.
The PCM will store conditions which were present when the DTC set as Freeze Frame and Fail Records data.


NOTE: Although these diagnostics are considered type A, they act like type B diagnostics under certain conditions. Whenever the EVAP diagnostics report that the system has passed, or if the battery has been disconnected, the diagnostic must fail during two consecutive cold start trips before setting a DTC. The initial failure is not reported to the diagnostic executive or displayed on a scan tool. A passing system always reports to the diagnostic executive immediately.


CONDITIONS FOR CLEARING THE MIL/DTC


The PCM will turn the MIL OFF during the third consecutive trip in which the diagnostic has been run and passed.

The history DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction.
The DTC can be cleared by using the scan tool Clear Info function or by disconnecting the PCM battery feed.


DIAGNOSTIC AIDS
Check for the following conditions:


Poor connection at the PCM.
Inspect harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, and poor terminal to wire connection.


Damaged harness.
Inspect the wiring harness for damage.


If the harness appears to be OK, connect the J 41413 EVAP pressure/purge diagnostic station to the EVAP service port, pressurize the EVAP system to 10 in. H2O and observe the Fuel Tank Pressure display on the scan tool while moving connectors and wiring harnesses related to the EVAP purge valve. A sudden change in the display will indicate the location of the malfunction.
Incorrect vacuum line routing.
Verify that the source vacuum line routing to the EVAP purge valve is correct and that the EVAP purge and source vacuum lines to the EVAP purge solenoid are not switched.


Malfunctioning or damaged canister.
A malfunctioning canister may intermittently allow charcoal into the EVAP purge solenoid, vacuum switch, and associated lines causing a DTC to be set. Use the following procedure to check for a carbon release condition:


Turn OFF the ignition switch.
Remove the EVAP purge valve.
Lightly tap the EVAP purge valve and (if applicable) the vacuum switch on a clean work area looking for carbon particles exiting either of the vacuum ports.
If no carbon release is evident, reinstall the components and continue with the DTC P1441 table. If carbon is being released from either component, continue with this service procedure.
Remove the charcoal canister from the vehicle.
Ensure that the main cylinder valve is turned off on the J 41413 EVAP purge/pressure diagnostic station.
Disconnect the black hose that connects the nitrogen cylinder to the EVAP purge/pressure diagnostic station at the pressure regulator by unscrewing the knurled nut on the regulator. No tools are required to remove the black hose from the regulator.
Using a section of vacuum line, connect one end over the open threaded fitting of the EVAP purge/pressure diagnostic station pressure regulator.
Connect the remaining end to the EVAP purge valve end of the EVAP purge line at the vehicle and turn on the main nitrogen cylinder valve. Continue to blow any debris from the purge line for 15 seconds.
Return the EVAP Pressure/Purge Diagnostic Station to its original condition by re-installing the black hose that was disconnected in step 7.
Replace the following components:
The EVAP purge valve.
The EVAP canister.
Proceed with the the DTC P1441 diagnostic table.
Reviewing the Fail Records vehicle mileage since the diagnostic test last failed may help determine how often the condition that caused the DTC to set occurs. This may assist in diagnosing the condition.


TEST DESCRIPTION
Number(s) below refer to the step number(s) on the Diagnostic Table.


If an EVAP purge valve electrical malfunction is present, the purge system will not operate correctly. Repairing the electrical malfunction will very likely correct the condition that set DTC P1441.
Checks the Fuel Tank Pressure sensor at ambient pressure
Checks for a stuck open EVAP purge valve.
Verifies that the fuel tank pressure sensor accurately reacts to EVAP system pressure changes.
If the EVAP purge and engine vacuum lines are switched at the EVAP purge solenoid, the solenoid valve will leak vacuum.
The PCM will command the EVAP purge and EVAP canister vent valves closed with the scan tool Seal System EVAP output control function activated. Fuel tank pressure should not decrease under this condition.


Hope this helps.

Jun 25, 2012 | 1999 Buick Century

1 Answer

99 chrysler 300 m po455 smells like fuel when first starting up and at idle for extended periods run great


Hi there,

Code P0455 denotes "Evaporative Emmission Control System Malfunction".

The Evap system relates to petrol vapours which are recirculated and any excess fumes are absorbed by a little canister in the engine bay (look for rubber hoses going to a metal canistor).

This code generally triggers when it has detected a leak somewhere in the Evap system.

This could be anything ranging from petrol vapour leaking from the fuel cap (check for loose or incorrect fuel tank cap); faulty purge solenoid; charcoal canister is blocked/not working or a leaking hose etc.

You will need to check the entire system for a vapour leak somewhere, as leaking fuel vapour can be dangerous. Check the security of all rubber hoses.

Good luck.......



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Jun 05, 2011 | Chrysler 300M Cars & Trucks

3 Answers

2000 Ford Expedition My Expedition (4.6L V-9 2WD) has had an intermittent problem of cutting out. The Check Engine light was not coming on - so I figured it is not a misfire. It drove just like it had...


Continuous Memory Diagnostic Trouble Code (DTC) P0446 or P1450 indicates that Self-Test has detected the Evaporative Emission Control System has excessive fuel tank vacuum. Also, a DTC P0446 indicates a vent control malfunction.

Possible causes:

EVAP canister purge outlet tube (EVAP canister purge valve to EVAP canister) blockages or kinks.

EVAP canister tube (fuel tank to EVAP canister) blockages or kinks.

Fuel vapor elbow on EVAP canister contaminated.

Restricted EVAP canister.

Canister vent (CV) solenoid stuck closed (partially or fully).

Plugged or contaminated CV solenoid filter.

EVAP canister purge valve stuck open.

Fuel filler cap stuck closed (no vacuum relief).

VREF circuit open in fuel tank pressure (FTP) sensor.

Damaged FTP sensor. (fuel tank pressure)

Check for kinks or bends in the fuel vapor hoses/tubes (EVAP canister purge outlet tube and EVAP canister tube).

Visually inspect EVAP canister inlet port, CV solenoid filter and canister vent hose assembly for contamination or debris.

Check CV solenoid filter for blockage or contamination.

The common things I've seen are are mud in the canister and the canister vent solenoid being shot or the wiring to the canister vent solenoid being torn off. The resistance of the solenoid should be 48-65 ohms..
Pick up a Chiltons book and will give you a diagram of where exactly you find the canister. They are like $15 at any auto store. Good luck

May 22, 2011 | 2000 Ford Expedition

2 Answers

Ford escort wagon 1997 code p1443 displayed. what does this indicate & where is the cannister? thank you.


P1443 - EVAP Control System / Vacuum System Purge Control Solenoid Or Purge Control Valve Fault. A fuel tank pressure change greater than minus (-) 7 inches of water in 30 seconds occurred with a purge (fuel vapor) flow at less than 0.02 pounds per minute.

Possible Causes:
  • Blocked fuel vapor hose between the EVAP canister purge valve and the FTP sensor.
  • Blocked fuel vapor hose between the EVAP canister purge valve and the engine intake manifold.
  • Blocked vacuum hose between the EVAP canister purge valve solenoid and the engine intake manifold.
  • EVAP canister purge valve stuck closed (mechanically).

  • Possible Solution:
    Check for blockages between the fuel tank, the EVAP canister purge valve, and the engine intake manifold. Check for obstructions in the EVAP canister purge valve diaphragm and ports.

    The canister is on the passengers side near the firewall if I recall correctly.

    Jan 18, 2011 | Ford Escort Cars & Trucks

    1 Answer

    How to Change a Fuel Pump on an 2005 Envoy XLT? Must drop the tank? Does it have access under the rear seat?


    Usually there is no access under the rear seat for safety reasons.prev.gif next.gif Fuel Tank Removal & Installation 2002-2004 To Remove:
    1. Relieve the pressure in the fuel system.
    2. Lift the vehicle.
    3. Remove the frame brace from the frame.
    4. Remove the fuel tank shield from the fuel tank.
    5. Drain the fuel from the tank into an approved container.
    6. Loosen the fuel hose clamp and disconnect the hose from the fuel tank.
    7. Disconnect the evaporative emission (EVAP) vent valve and fuel tank pressure sensor connectors. Evaporative emission cansister pipes removal and installation gm-05-00-1546.gif

    8. Disconnect the evaporative emission (EVAP) vapor and vent valve pipes from the evaporative emission (EVAP) canister.
    9. Disconnect the fuel return and feed pipes from the fuel tank.
    10. To avoid system contamination, cap the evaporative emission (EVAP) and fuel pipes.
    11. Use a jack to support the fuel tank. Fuel tank removal and installation gm-05-00-1547.gif

    12. Detach the fuel tank straps from the frame.
    13. Lower the fuel tank.
    14. Disconnect the fuel sender connector.
    15. Remove the fuel tank from the vehicle.
    To Install:
    1. Place the fuel tank under the vehicle.
    2. Connect the fuel sender connector.
    3. Attach the fuel tank straps to the frame. Torque the bolts to 24 ft-lb (32 Nm).
    4. Remove the caps from the evaporative emission (EVAP) and fuel pipes.
    5. Connect the evaporative emission (EVAP) vapor and vent valve pipes to the evaporative emission (EVAP) canister.
    6. Connect the evaporative emission (EVAP) vent valve and fuel tank pressure sensor connectors.
    7. Connect the fuel hose to the fuel tank. Torque the clamp to 22 in-lb (2.5 Nm).
    8. Connect the fuel return and feed pipes to the fuel tank.
    9. Lower the vehicle.
    10. Refill the fuel tank.
    11. Turn on the ignition for 2 seconds, with the engine off, and then turn off the ignition. After 10 seconds, turn the ignition back on with the engine off.
    12. Lift the vehicle.
    13. Check for leaks in the fuel lines.
    14. Install the fuel tank shield onto the fuel tank.
    15. Install the frame brace onto the frame.
    16. Lower the vehicle.
    2005-2007 To Remove:
    1. Relieve the pressure in the fuel system.
    2. Lift the vehicle.
    3. Remove the frame brace from the frame.
    4. Remove the fuel tank shield from the fuel tank.
    5. Drain the fuel from the tank into an approved container. Evaporative emission cansister pipes removal and installation gm-05-00-1544.gif

    6. Disconnect the evaporative emission (EVAP) canister fresh air, solenoid, and purge pipes from the evaporative emission (EVAP) canister.
    7. Disconnect the fuel filler pipe recirculation hose from the fuel tank.
    8. Loosen the fuel fill pipe clamp and disconnect the pipe from the fuel tank.
    9. Disconnect the fuel feed and evaporative emission (EVAP) pipes from the fuel tank.
    10. To avoid system contamination, cap the pipes.
    11. Use a jack to support the fuel tank. Fuel tank removal and installation gm-05-00-1545.gif

    12. Detach the fuel tank straps from the frame.
    13. Lower the fuel tank.
    14. Disconnect the evaporative emission (EVAP) vent valve, fuel tank pressure sensor, and fuel sender connectors.
    15. Remove the fuel tank from the vehicle.
    To Install:
    1. Place the fuel tank under the vehicle.
    2. Connect the evaporative emission (EVAP) vent valve, fuel tank pressure sensor, and fuel sender connectors.
    3. Lift the fuel tank.
    4. Attach the fuel tank straps to the frame. Torque the screws to 24 ft-lb (32 Nm).
    5. Remove the caps from the pipes.
    6. Connect the fuel feed and evaporative emission (EVAP) pipes to the fuel tank.
    7. Connect the fuel fill pipe to the fuel tank. Torque the clamp to 22 in-lb (2.5 Nm).
    8. Connect the fuel filler pipe recirculation hose to the fuel tank.
    9. Connect the evaporative emission (EVAP) canister fresh air, solenoid, and purge pipes to the evaporative emission (EVAP) canister.
    10. Lower the vehicle.
    11. Refill the fuel tank.
    12. Turn on the ignition for 2 seconds, with the engine off, and then turn off the ignition. After 10 seconds, turn the ignition back on with the engine off.
    13. Lift the vehicle.
    14. Check for leaks in the fuel lines.
    15. Install the fuel tank shield onto the fuel tank.
    16. Install the frame brace onto the frame.
    17. Lower the vehicle.

    Jul 11, 2010 | 2005 GMC Envoy Xl

    3 Answers

    What is a p0440 problem?


    Hi there,

    Oldsmobile code P0440 refers to: Evaporative Emission System

    This means there is a problem with the Evap System, and you will need to inspect the related components:

    - Purge Solenoid:

    Related Symptoms
    • Stalls after start with a hot engine
    • Poor Fuel economy
    • Emission related faults
    - Evap Canistor: Check evap canistor for loose carbon.

    - Evap Canistor Vent Valve:

    Related Symptoms
    • Poor fuel economy
    • Stalls after start
    • Emissions related failure DTC codes
    Hope this helps...

    Cheers,

    Nov 12, 2009 | 2001 Oldsmobile Alero

    1 Answer

    Hi my 2005 Chevrolet Tahoe seems to have a blocked fuel vent .When I try to fill it I can hear a whistling and the fuel keeps backing up in the filler neck . Do yoy have any drawings for the routing or...



    There may be a problem with your EVAP system.Dirt/dust can get into the system causing a poor fill condition.Replacement of EVAP canister and or vent solenoid may be required.
    The canister and vent solenoid are located near the gas tank on the passenger side under the vehicle.


    • Fuel fill limiter vent valve stuck closed • Evaporative emission (EVAP) canister restricted • EVAP vent valve stuck closed • Hose between canister and canister vent solenoid twisted or kinked if applicable • High fuel temperature • Fuel filler hose is kinked

    Nov 01, 2009 | 2005 Chevrolet Tahoe

    2 Answers

    Obd code 446 for 1999 toyota camry 2.2L How to fix it


    Do you mean P0446 since I'm guessing you removed the P and 0 from the beginning.
    This is related to your Fuel system

    Your gas cap may not have been tightened fully (this usually generates a different code though)
    Your purge solenoid may be malfunctioning
    Your canister may be clogged

    Sep 24, 2009 | 1999 Toyota Camry

    1 Answer

    Im getting a P0441 EVAP emission control system purge flow fault code on my 2002 dodge neon


    Here is what I could find for your code error as potential causes:
    After market parts and accessories nonconforming to the EVAP system specifications.
    Damaged, missing or improperly installed fuel filler cap.
    Blockage in fuel vapor hoses/tubes (EVAP canister tube, EVAP canister purge outlet tube or EVAP return tube) in EVAP system.
    Disconnected or cracked fuel vapor hoses/tubes in EVAP system.
    EVAP canister purge valve stuck closed.
    Canister vent (CV) solenoid stuck open.
    Fuel tank pressure (FTP) sensor malfunction.
    EVAP canister leaking.
    Fuel vapor control valve tube assembly blocked.
    Fuel vapor vent valve assembly blocked.

    Obviously the gas cap would be the easiest and cheapest thing to fix.  Just make sure it is put on correctly and tight.  If it is not that, I would have to suggest to take it to a mechanic because the other problems on that list are not really DIY material.  Hopefully it is the gas cap and you can take care of it yourself.  Good luck.

    May 17, 2009 | 2002 Dodge Neon

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