Question about 2001 Toyota Corolla

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Trouble code P0441 on 2009 Corolla

I'll check hoses that I can access and gas cap. What's next in the logical sequence of steps? Thanks, Eric

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  • Toyota Master
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PO441 IS INCORRECT EVAP PURGE FLOW.YOU HAVE A OPEN TO SHORT PURGE CONTROL CIRCUIT.

Posted on Jul 13, 2009

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Check engine light comes on


yes. the rubber gaskets do wear out. on most vehicles the gas cap
should be tightened 'til it"clicks". you probably can't tell from the
"appearance" but if you tighten 'til it clicks then drive for awshile and still
get the same code, the next step is a NEW gas cap/

Sep 25, 2012 | 2002 Chrysler Town & Country

1 Answer

Po440 code 96 nissan pu 2.4 engine


Hi Glenn:
This indicates that a part of the EVAP control system is no longer fuctioning correctly. The EVAP system consists of many parts, including (but not limited to) the gas cap, fuel lines, carbon canister, purge valve, and other hoses. The (EVAP) emission control system prevents the escape of fuel vapors from a vehicle's fuel system. Fuel vapors are routed by hoses to a charcoal canister for storage. Later, when the engine is running a purge control valve opens allowing intake vacuum to siphon the fuel vapors into the engine.

A code P0440 could mean one or more of the following has happened:
The gas cap is not installed or working properly
The purge solenoid has failed
The canister is plugged and not working properly

With a P0440 OBD-II trouble code, diagnosis can be tricky at times. Here are some things to try:
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

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

Feb 22, 2012 | Cars & Trucks

1 Answer

Po440 code 96 nissan pu 2.4 engine


This indicates that a part of the EVAP control system is no longer fuctioning correctly. The EVAP system consists of many parts, including (but not limited to) the gas cap, fuel lines, carbon canister, purge valve, and other hoses. The (EVAP) emission control system prevents the escape of fuel vapors from a vehicle's fuel system. Fuel vapors are routed by hoses to a charcoal canister for storage. Later, when the engine is running a purge control valve opens allowing intake vacuum to siphon the fuel vapors into the engine.

A code P0440 could mean one or more of the following has happened:
The gas cap is not installed or working properly
The purge solenoid has failed
The canister is plugged and not working properly

With a P0440 OBD-II trouble code, diagnosis can be tricky at times. Here are some things to try:
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

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

Feb 22, 2012 | Cars & Trucks

2 Answers

Po440code 96nissan pu 2.4engine replaced gas cap code still coming on


You must have a leak somewhere in the tank, because gas caps seal and vent at a certain pressure (1-2psi) a smoke test would check it. Try clearing the code first. If it keeps comming up, test it.

Feb 22, 2012 | Nissan Pickup Cars & Trucks

2 Answers

My 2004 cavalier runs rough, the check engine light stays on. It stalls out or acts like it is about to, whenever I drive it. I have it parked for now, don't trust it. I had the fuel pump replaced in 08,...


The light is on because your computer detected a problem with your vehicle Eric. In all honesty, there are many things that can cause it to go off. You should take it to Autozone to have a free computer scan. They will let you know why the light came on. It might solve the issue with your car. That way, you know what you are looking for. It may be fuel related Eric. Check the gas lines and the fuel filter. If your fuel pump is not getting 12V of power, it won't work properly. You also have fuel injectors that could leak or may not be working. Eric, it could also be in the ignition system. It could be a bad distributor cap or a sensor going bad. You just need to check them one step at a time. But, since the light is on, take it to get scanned if you haven't already. It could really help. So many things can cause the car to act rough, you just have to start checking. It could be a vacuum leak in your hoses. Check them out. Check the air filter, pcv valve. If you have a question, just let me know. I will help. Eric, best of luck.

Mar 04, 2011 | 2004 Chevrolet Cavalier

3 Answers

Emission control malfuction p0440


Easier said then done without professional tools

However, I'll start you will some theory, then the shop manual procedures followed by some "common" problems

Theory:
Evaporative leak detection strategy is based on applying vacuum to EVAP system and monitoring vacuum decay. Powertrain Control Module (PCM) monitors vacuum level by means of fuel tank vacuum sensor input. At a predetermined time, EVAP purge solenoid and EVAP vent solenoid are turned on. This allows engine vacuum to draw a small vacuum on entire EVAP system. Whenever a sufficient vacuum level cannot be achieved, a large leak or faulty EVAP purge solenoid is indicated.

Conditions for setting this DTC are as follows:
No TP sensor, ODM, IAT sensor, or MAP sensor DTCs present.
Start-up ECT 40-86°F (4-30°C).
Start-up ECT not greater than 14°F (8°C) greater than start-up IAT.
Start-up IAT not greater than 4°F (2°C) of start-up ECT.
Fuel tank level is 15-85 percent.
BARO is greater than 75 kPa.
Vehicle has been driven at least 11 miles.
EVAP system is unable to achieve or maintain vacuum during diagnostic test.

Diagnostic Procedures
1.) Perform On-Board Diagnostic (OBD) system check.
After performing OBD system check, go to next step.

2.) Check if DTC P1665 or P1676 is also set. If any of DTCs is present, diagnose affected DTCs. If DTCs are not present, go to next step.

3.) Turn ignition off. Remove fuel filler cap. Turn ignition on. Using scan tool, observe fuel tank pressure. If fuel tank pressure is zero in. H2O, go to next step. If fuel tank pressure in not zero in. H2O, diagnose evaporative system.

4.) Replace fuel filler cap. Using scan tool, capture FAILURE RECORD data for DTC P0440 and clear DTC. Command EVAP vent solenoid on. Connect EVAP Pressure/Purge Diagnostic Station (J-41413) to EVAP service port. Pressurize EVAP system using diagnostic station. Monitor pressure on EVAP pressure gauge on diagnostic station. If pressure is 5 in. H2O, go to next step. If pressure is not 5 in. H2O, go to step 6.

5.) Maintain EVAP pressure at 5 in. H2O. Observe fuel tank pressure on scan tool. If fuel tank pressure reading on scan tool is 5 in. H2O, go to step 8. If reading is not 5 in. H2O, go to next step.

6.) Disconnect fuel tank vapor line and EVAP purge line from EVAP canister. Block canister fitting for fuel tank pressure line. Connect a hand-held vacuum pump to canister fitting for EVAP purge line. Ensure that EVAP vent solenoid is still commanded on. Apply vacuum to EVAP canister. If vacuum can be maintained at 5 in. Hg, go to step 11. If vacuum cannot be maintained at 5 in. Hg, go to step 10.

7.) Check for restriction in fuel tank vapor line or EVAP purge line. Repair as necessary. After repairs, go to step 16. If restriction is not found, diagnose EVAP system.

8.) Disconnect vacuum source line at EVAP purge solenoid and plug vacuum source fitting on solenoid. Using scan tool's output tests function, select and activate SYSTEM PERF. Pressurize EVAP system to 5 in H2O. Observe EVAP pressure gauge on diagnostic station while removing plug from EVAP purge solenoid vacuum source fitting. If EVAP pressure decreases to zero in. H2O within 15 seconds while system performance is activated, go to next step. If EVAP pressure does not decrease to zero in. H2O within 15 seconds, go to step 13.

9.) Install vacuum gauge on EVAP diagnostic station to vacuum source line. Start and operate engine to greater than 2000 RPM. Observe source vacuum level. If vacuum level is greater than -15 in. Hg, If vacuum level is not greater than -15 in. Hg, go to step 14.

10.) Check for disconnected or damaged vent hose. Check for damaged EVAP canister. Repair as necessary. After repairs, go to step 16. If no problems are found, go to next step.

11.) Check for faulty or missing fuel filler cap. Check for disconnected or leaking fuel tank vapor line. Check for disconnected or damaged EVAP purge line. If problem is found, repair as necessary. After repairs, go to step 16. If no problems are found, go to next step.

12.) Using scan tool, command EVAP vent solenoid on. Continuously attempt to pressurize the EVAP system by leaving the EVAP diagnostic station control knob in the pressurized position. Using the Ultrasonic Leak Detector (J-41416), locate and repair leak in EVAP system. After repairs, go to step 16.

13.) Replace EVAP purge solenoid. After replacing solenoid, go to step 16.

14.) Check for carbon release into the EVAP system. Repair as necessary. After repairs, go to step 16.

15.) Replace EVAP vent solenoid. After replacing solenoid, go to next step.

15.) Turn ignition on. Using scan tool, command EVAP vent solenoid on. Using EVAP diagnostic station, pressurize EVAP system to 15 in. H2O. Move rotary switch in diagnostic station to HOLD and observe EVAP pressure gauge. If EVAP pressure decreases to less than 10 in. Hg within 2 minutes, repeat step 3. If EVAP pressure does not decrease, system is okay.

Diagnostic Aids
Check for the following:
Cracked or punctured EVAP canister.
Damaged or disconnected source vacuum line, EVAP purge line, vent hose, for fuel tank vapor line.
Poor connection at PCM.
Inspect harness connectors for backed-out terminals, improper mating, broken lock, damaged terminals, or poor wire connection.
Check for intermittent in circuit.
Check for kinked, pinched or plugged vacuum lines to EVAP purge or fuel tank vapor line. Also check for restrictions.
Faulty or damaged evaporative canister.

Apr 28, 2010 | 1999 Buick Century

1 Answer

2001 toyota 4runner< engine light on, code comes out to be - p0441 auto zone said change gas cap, i did, 2 weeks later light comes on again< what do you think?


You can get this code if you don't tighten the gas cap all the way, or the gas cap is bad. I will put all the detail for the code below and what I would do to fix the problem...

NOTE: Do not top off your tank either. This could cause the 'overfill check valve' to fail, and could cause this code.

Definition of P0441: Evaporative Emission Control System Incorrect
Purge Flow

Detection logic:
DTCs P0441 and P0446 are recorded by the ECM when evaporative emissions leak from the emissions components
or when there is a malfunction in either the VSV for EVAP, the VSV for
pressure switching valve, or in the vapor pressure sensor itself.
detection cause: Pressure in charcoal canister and fuel tank does not drop or
drop in pressure increased beyond the specified limit during
purge control (2 trip detection logic)

What I would do:
1. Replace fuel cap and reset computer. If code returns, then proceed to next

The next steps require a diagram, so the purchase of service manual to locate the components is very helpful

2. Check for vacuum leaks in ALL emission hoses
3. Check VSV valve operation (there are three; they are ~$75 new from dealer, and sometimes fail)
4. Check for cracks or leaks around or in the charcoal canister (usually requires a smoke machine)
5. check for voltage to VSV's
6. Last resort: take it to the dealer and have them run a diagnosis. This should run between $50-$100.

Good luck!

-Chris

Dec 11, 2009 | 2001 Toyota 4Runner

1 Answer

2004 Audi allroad V8 Check Engine Light ON: 65,000 miles.


It can be your CO2 sensor. And another one that all ways makes the check engine light come on is your gas cap be for you turn your car on make sure your gas cap is on like 3 clicks then go clear the codes. If that doesn't help then good luck

Apr 13, 2009 | 2004 Audi allroad

2 Answers

Toyota Corolla LE 88 rough start


have you checked the fuel filter?

Dec 05, 2008 | 1988 Toyota Corolla 4 Door

2 Answers

Obd code p0440 for check engine light on 2000 Toyota Corolla


p0440 code means that the evap system has a leak. This could be caused by a bad or improperly installed gas cap. Either that or the purge solenoid has failed or the canister is plugged and not working properly.

Nov 15, 2008 | 2001 Toyota Corolla

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