Obd Codes 0440 And 1448

[s2cmpugh]

Good day everyone. Last night the SES light came on, so when I got home I pulled the codes. The reader said P0440 and P1448. When I purchased the truck the previous owner did say the SES would come on and then go off occasionally. After doing some research on this board, I found this thread detailing how to fix this problem. http://www.nissanpathfinders.net/forum/index.php?showtopic=11442&st=0&p=177630&hl=evap&fromsearch=1entry177630 Will this fix my problem or is something else going on?

 

The gas cap is on tight.

 

Thanks,

Cris

[s2cmpugh]

Good day everyone. Last night the SES light came on, so when I got home I pulled the codes. The reader said P0440 and P1448. When I purchased the truck the previous owner did say the SES would come on and then go off occasionally. After doing some research on this board, I found this thread detailing how to fix this problem. http://www.nissanpathfinders.net/forum/index.php?showtopic=11442&st=0&p=177630&hl=evap&fromsearch=1entry177630 Will this fix my problem or is something else going on?

 

The gas cap is on tight.

 

Thanks,

Cris

 

Hi everyone. Yesterday I decided to drop the EVAP canister and have a look. First though I checked all the rubber lines at the front and they all appeared to be OK. So after dropping the canister and pulling the EVAP canister vent control valve, I noticed two things; the solenoid DOES NOT click when I apply voltage so it's stuck open I think (hence the 1448; EVAP valve stuck open) and little bits of charcoal fell out, and I think that isn't supposed to happen. Is this correct? When I disconnected some of the vacume lines, no charcoal fell out.

 

Here is my other question, in this evap HOW-TO link, he has a purge volume control valve mounted around the left front strut area next to the brake booster. Ummmm, I don't have ANY of that stuff. I have a hard line coming up and across the firewall, then to a rubber line with the EVAP service port, then another rubber line to a little valve/solenoid on top of the engine, then another "outlet" rubber line into the intake manifold. My pathfinder is a 1998 SE 4x4 with a manufacture date of 3/98. Can someone explain why mine is different?

 

Thanks!

Cris

 

P.S. I'm going to order a new canister and valve w/ O ring today.

[5523Pathfinder]

Yeah, the 98's evap system is just a bit different. There is still a line that runs up to the intake. It passes right nest to the brake master cylinder, and has a port for testing. Just follow that to the intake. It does sound like the Vent Control Valve is your problem. Though, there is two valves called the Vacuum Cut Valve, and the Vacuum Cut Valve Bypass Vavle that can cause some issues. These valve are near the canister, inline with each other. One is a solenid the other is vacuum operated. After you replace the canister and vent control valve, drive it for awhile and post up what happens.

[s2cmpugh]

Yeah, the 98's evap system is just a bit different. There is still a line that runs up to the intake. It passes right nest to the brake master cylinder, and has a port for testing. Just follow that to the intake. It does sound like the Vent Control Valve is your problem. Though, there is two valves called the Vacuum Cut Valve, and the Vacuum Cut Valve Bypass Vavle that can cause some issues. These valve are near the canister, inline with each other. One is a solenid the other is vacuum operated. After you replace the canister and vent control valve, drive it for awhile and post up what happens.

 

I tested the canister vent valve and it failed the test. I'm going to blow out all the lines as soon as my parts get here and I'm pretty sure that should fix the problem. Not much charcoal fell out (little pellets) when I shook the canister.

 

After the fix I'll let you guys knows if anything comes up again.

 

Thanks,

Cris