P0325, P0443, P0446 codes

[HitTheTrails]

Hi guys, I need some help with EVAP system.

 

I got P0325 and P0446 as fault codes, with both of them also listed as pending. I read the knock sensor code is no big deal, my engine isn't knocking or pinging, but the other code, P0446 (EVAP Emmision Control System Vent Circuit Malfunction) bothered me so I started investigating.

I read the how-to that QuismO wrote and I checked out the purge volume control valve, there was no charcoal in it or the hoses to/from it and I spilt it apart and made sure the motor is working and the grey plastic valve is operating (goes in/out with ignition on/off). I also checked the purge control valve and it's hose, all clean in there too.

So next thing I checked was the vent control valve and the EVAP cannister behind the driver's side rear wheel. The cannister didn't seem to be loosing charcoal (none coming out when shaking) and I removed the valve and used a 12VDC power source to verify it was working properly (valve plunger goes up with power, drops back down when power is removed). Next thing I did was blow air from the engine bay to where the cannister was just as in QuismO's how-to and no charcoal came out or anything, seems clear. So I just put everything back together.

I drove to work today and checked my codes again and now I'm also getting P0443 as a pending code (along with p0325/p0446 fault codes)!

 

Please help me with any ideas/suggestions...

[HitTheTrails]

Just an update:

 

After this previous post I removed the vent control valve and the EVAP cannister behind the driver's side rear wheel again and cleaned the valve by spraying WD40 on it and used and rag to clean up a bit, then I put it back together. It's been almost 2 months now and I'm not getting any EVAP codes anymore. I guess all it needed was a bit of cleaning.

 

This info might be useful to others having the same code (P0446).

 

Cheers!

[94extreme]

cool. thanks for the update.