Question about Saturn Ion
you should be able to fix it look for a can near the fuel tank that has vacuum hoses coming out of it and you should be able to just buy the bad solenoid
Posted on Nov 03, 2008
DTC P0446 Evaporative Emission (EVAP) Vent System Performance
The vehicle control module (VCM) monitors the performance of the evaporative emission (EVAP) system by applying a predetermined level of vacuum to the EVAP system and monitors the vacuum decay rate. The VCM sets this diagnostic trouble code (DTC) if the vacuum decay rate is more than a predetermined value. The VCM monitors the amount of vacuum and the amount of pressure in the EVAP system by monitoring the fuel tank pressure sensor. For this DTC, the VCM turns ON both the EVAP purge valve and the EVAP vent valve when the Conditions for Running the DTC are met. This applies an engine vacuum to a closed EVAP system. The VCM turns OFF both the EVAP purge valve and the EVAP vent valve when the system reaches a correct amount of vacuum. The EVAP system should quickly RELEASE the vacuum in the EVAP system with the EVAP purge valve OFF and the EVAP vent valve OFF (open). This test indicates a blocked or restricted EVAP vent path if the EVAP system fails to release the vacuum quickly enough.
Posted on Dec 06, 2008
That is an EVAP code. its a vent control code. you can manually test it by powering it up if you know where its at. i cant remember exaclty where its at off the top of my head but its only 2 wires. using a volt meter you want to make sure power is getting to it, but you cannot activate it without dealer scan tool.hmmm if you can figure out which is ground and power when you give it 12 volts it should click. meaning your vent solenoid works and you have wiring problems or its leaking.
EVAP problems are hard to finde with out scanners. you can change the vent solenoid and hope it fixes it. but a code points you to the direction of a problem. hopefull its not wiring problems. in the northern states with snow. ice can pull out wires and also get clogged in the vent solenoid and lock it up. its either wiring or bad or a leaking solenoid. check condition of wires. if they look good try a vent soleniod.
if that doesnt fix it after a engine light reset and 2 weeks or so. then goto dealer. you need to reset it after repair. light will not go off on its own.GOOD LUCK
Posted on Apr 29, 2009
in my experience the usual culprit is the evap cannister. the problem is it gets moisture in it and freezes during winter thus cracking the plastic. if you lay under the car and look at the evap box it black plastic and if you see a loose or cracked hose or the box itself is cracked that is most likely it. as a side note you can check the gas cap and buy a new one to see if that rectifies the situation. lastly i don't think the gas tank should be suspect as you would probably notice if gas was leaking out of the tank. if you take the car to a dealer or shop they can do a smoke test and determine where the leak is.
Posted on Oct 19, 2010
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An EVAP canister, vent hose, or vent solenoid valve that has restricted flow may cause this DTC to set. Using a purge solenoid command with a scan tool will allow vacuum to be applied to the system instead of pressure. With the engine running, the EVAP canister vent solenoid valve open, and the EVAP canister purge solenoid valve commanded to 100 percent, the fuel tank vacuum should not increase to more than 5 inches H2O.
An EVAP canister filter that is restricted can cause this DTC to set. Refer to Evaporative Emission Canister Replacement .
Disconnecting one component at a time while the EVAP system is under flow will help to pinpoint a restriction in the system
Do you have a scan tool that reads data PID'S ?
Your FTP - fuel tank pressure sensor could be at fault !
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Evaporative Emissions (EVAP) Vent System Performance
The EVAP system tests run when the engine is first started and meets the Conditions for Running the DTC. An intermittent condition could be caused by a damaged EVAP vent housing, a temporary blockage at the EVAP canister vent inlet, or a pinched vent hose. A blockage in the vent system will also cause a poor fuel fill condition.An EVAP canister, vent hose, or vent solenoid valve that has restricted flow may cause this DTC to set. Using a purge solenoid command with a scan tool will allow vacuum to be applied to the system instead of pressure. With the engine running, the EVAP canister vent solenoid valve open and the EVAP canister purge solenoid valve commanded to 100 percent, the fuel tank vacuum should not increase to more than 5 inches H2O.An EVAP canister filter that is restricted can cause this DTC to set. Refer to Evaporative Emission (EVAP) Canister Filter Replacement and Evaporative Emission (EVAP) System Cleaning .Disconnecting one component at a time while the EVAP system is under flow will help to pinpoint a restriction in the system.Reviewing the Failure Records vehicle mileage since the diagnostic test last failed may help determine how often the condition that caused the DTC to be set occurs. This may assist in diagnosing the condition.For intermittent conditions, refer to Intermittent Conditions .
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NISSAN OBDII DTC
P1105 Manifold Absolute Pressure/Barometric Pressure Switch Solenoid Circuit
P1110 Intake Valve Timing Control Circuit (Bank 1)
P1120 Secondary Throttle Position Sensor Circuit
P1125 Tandem Throttle Position Sensor Circuit
P1132 Intake Valve Timing Control Position Sensor (Bank 1)
P1135 Intake Valve Timing Control Circuit (Bank 2)
P1137 Intake Valve Timing Control Position Sensor (Bank 2)
P1140 Intake Valve Timing Control Position Sensor (Bank 1)
P1145 Intake Valve Timing Control Position Sensor (Bank 2)
P1148 Closed Loop Fault Detected (Bank 1)
P1168 Closed Loop Fault Detected (Bank 2)
P1210 Traction Control System Signal Fault
P1220 Fuel Pump Control Module Fault
P1320 Ignition Control Signal Fault
P1335 Crankshaft Position Sensor Circuit
P1336 Crankshaft Position Sensor circuit
P1400 EGR/EVAP Control Solenoid Circuit
P1401 EGR Temperature Sensor Circuit
P1402 EGR System Fault Detected
P1440 EVAP Canister System Leak Detected
P1441 EVAP Vacuum Cut Valve Bypass Valve Circuit
P1443 EVAP Canister Control Vacuum Switch Circuit
P1444 EVAP Canister Purge Volume Control Valve Circuit
P1445 EVAP Purge Volume Control Valve
P1446 EVAP Canister Vent Valve Circuit
P1447 EVAP Canister Purge Flow/Volume Control Valve Circuit
P1448 EVAP Vent Control Valve Circuit
P1490 EVAP Vent Control Valve/Bypass Valve Circuit
P1491 EVAP Vacuum Cut Valve/Bypass Valve Circuit
P1492 EVAP Canister Purge Control Valve/Solenoid Valve
P1605 Transmission Control Module A/T Diagnosis Communication Line Fault
P1705 Throttle Position Switch Circuit
P1706 Park Neutral Position Switch Circuit
P1760 Overrun Clutch Solenoid Valve Circuit
P1900 Cooling Fan Control Circuit
sorry but your code reader is not reading manufacturers codes ,if an american market vehicle then you should be able to read them but if this is a europeon model then how did you manage to get this code??
P0235....Turbo/Super Charger Boost Sensor 'A' Circuit
this is a generic code if its any help
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