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DTC P0455: Evaporative Emission (EVAP) System Large Leak
Circuit/System Description
The powertrain control module (PCM) tests the evaporative emission (EVAP) system for a large leak. The PCM monitors the fuel tank pressure (FTP) sensor signal to determine the EVAP system vacuum level. When the conditions for running are met, the PCM commands the EVAP canister purge solenoid valve OPEN and the EVAP vent solenoid valve CLOSED . This allows engine vacuum to enter the EVAP system. At a calibrated time, or vacuum level, the PCM commands the EVAP canister purge solenoid valve closed, sealing the system, and monitors the FTP sensor input in order to determine the EVAP system vacuum level. The following table illustrates the relationship between the ON and OFF states, and the OPEN or CLOSED states of the EVAP canister purge and vent solenoid valves.
The red X by the 02 sensor on your scan tool has nothing to do with.
You had the gas cap and the purge valve replaced, how about the vent valve under the back of the car. These go bad, cause large leaks. Also check the fuel fill tube,they like to rust out causing large leaks. If all that is good you may won't to it to a repair shop an have it smoke tested.
Malfunction
The evaporative control (EVAP) system captures any raw fuel evaporating from the fuel storage system (e.g. the fuel tank, filler neck, and fuel cap). Under precise operating conditions-dictated by engine temperature, speed, and load-the EVAP system stores and purges these captured fuel vapors back into the combustion process. The carbon canister, which stores the raw fuel vapors, utilizes a vent valve that allows fresh air to enter the EVAP system. This displaces the fuel vapor as it's purged into the combustion process.
Code P0449 indicates that the evaporative control (EVAP) system vent valve solenoid is malfunctioning. This can be caused by either too little or too much electrical resistance or a mechanical problem with the vent valve itself.
P0449 Symptoms
Check Engine Light will illuminate
In most cases, there are no adverse conditions noticed by the driver
In some cases, there may be a noticeable fuel odor caused by the release of fuel vapors
Common Problems That Trigger the P0449 Code
Missing fuel cap
Defective Evaporative Vent Valve
Defective or damaged fuel cap
Distorted, damaged or cracked Fuel Tank Filler Neck
Torn or punctured Evaporative system hose(s)
Defective Fuel Tank Sending Unit gasket or seal
Split or damaged Carbon Canister
Defective or damaged fuel tank
Common Misdiagnoses
Fuel cap
Evaporative Purge Valve
Evaporative Vent Valve
Polluting Gases Expelled
HCs (Hydrocarbons): Unburned droplets of raw fuel that smell, affect breathing, and contribute to smog
? 2:17
https://www.youtube.com/watch?v=jIKaPF2Yw3I
Mar 20, 2007 - Uploaded by richpin06a
Saturn EVAP Solenoid Location. ... How To Test and Replace EVAP Canister Vent Control Valve P0446 - Duration: 6:18. by CarsNToys ...
It's located under the vehicle back behind the fuel tank , Installed in the canister !
Remove the EVAP canister vent solenoid valve from the canister !
Rotate the EVAP canister vent solenoid valve counterclockwise in order to release it from the locked position.
Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle . Disconnect the evaporative emission (EVAP) canister harness electrical connector (2) from the EVAP vent solenoid valve. Clean away any debris that may be present around the EVAP canister vent solenoid valve.
Remove the EVAP canister bolt. Lower the EVAP canister.
P0446 Evaporative Emission Control System Vent Control Circuit Malfunction
The code P0446 is set when the engine computer recognizes a fault or restriction at the vent control part of the Evaporative emission control system (EVAP). The description of the fault varies between different car manufacturers, but one thing is common, the code P0446 doesn't directly point to a defective part; some testing might be required to pinpoint the faulty component.
What can cause the code P0446:
- faulty vent control valve
- blockage at the vent hose, vent filter or vent control valve
- open or short in the vent control valve circuit
- bad charcoal canister
- EVAP system leak
- faulty EVAP system pressure sensor
- bad vacuum switching valve (VSV)
- stuck open purge valve (solenoid)
usually in front or on top of the gas tank. If you are getting a code
like P0449 "Evap Vent Solenoid Control Circuit Malfunction" You could
first check the wiring at the solenoid for corrsion, if OK change the
valve. If the solenoid is on the top of the tank you have to drop the
tank
CODE PO449 - EVAP VENT SOLENOID CONTROL CIRCUIT MALFUNCTION CONDITION. FIRST CHECK EVAP SOLENOID FUSE.IF ALL IS GOOD EVAP VENT SOLENOID LOCATED ON A BRACKET NEXT TO FUEL TANK.
Continuous Memory Diagnostic Trouble Code (DTC) P0442 indicates that a fuel
vapor leak has been detected [as small as 0.10 cm (0.04 inch)] in the
Evaporative Emission (EVAP) system. Note: Prior to performing the following diagnosis inspect the Canister
Vent Solenoid (CV) for contamination. A situation may exist where contamination
holds open the Canister Vent (CV) solenoid enough to set DTC P0442 and also
plugs the port to atmosphere enough to keep system from being vented quickly.
After market parts and accessories nonconforming to the EVAP system
specifications.
Damaged, cross threaded or loosely installed fuel filler cap.
Small holes or cuts in fuel vapor hoses/tubes (EVAP canister tube, EVAP
canister outlet tube or EVAP return tube) in the EVAP system.
Loose fuel vapor hose/tube connections to EVAP system components.
EVAP system component [EVAP canister purge valve, fuel tank pressure (FTP)
sensor, canister vent (CV) solenoid, fuel vapor control valve tube assembly or
fuel vapor vent valve assembly] seals leaking.
CV solenoid partially open when commanded closed.
EVAP canister leaking.
Check for presence of fuel filler cap.
Verify that the CV solenoid is properly seated on the EVAP canister (if
possible).
Visually inspect for cut or loose connections to fuel vapor hoses/tubes in
following locations:
EVAP canister to EVAP canister purge valve.
EVAP canister to fuel vapor vent valve assembly.
fuel vapor control valve tube assembly to fuel tank (if applicable).
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