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Update on my EVAP problem/ Did I finally Get It Right?


brc19761
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I have posted on this problem, as you can see in my recent posts. I have a 2008 Nissan Pathfinder 2wd. Around Christmas the service engine soon light came on. My ob2 scanner came back with a P0455 which was gross fuel evaporation leak. Well the wonderful people on this site I was given great information and advice,

 

First I replaced the gas cap with a new one from Autozone well that didn't solve the issue. Next I purchased a OEM gas cap from my local Nissan dealership that didn't fix it either. I studied the fsm on the EVAP problems and received much information from this website.

 

This Thursday I took the canister, all hoses, and the vent valve solenoid apart. Inspected all hoses and no cracks. I tested the vent valve solenoid, but I didn't get a clicking noise. I didn't really know what I was suppose to hear, if anything at all. I checked the spring and plunger and even moved the plunger manually. The vent valve solenoid was $70.00 at Autozone. I didn't know if the solenoid was good or bad and didn't want to waste my money not knowing. I put everything back together.

 

Next I took the purge valve solenoid (which is located on the engine) off. I tested it and it would make a loud clicking noise. I started the Pathfinder up to make sure everything was working and then cleared the code. I got up the next morning and immediately the check engine light soon came on. I got the ob2 scanner and it read a new code (only the one code). The code was P0447 which is Evaporation Emission Vent System Control Circuit Open. I cleared the code and started the vehicle up and immediately the light came on with the same code. I went and checked the wiring harness was secure on the vent valve solenoid (it was secure). I drove the Pathfinder to town and back and it ran fine.

 

I was thinking since I moved the vent valve solenoid by hand that maybe it was stuck and moving it caused it to unseal and the solenoid was not working. Does that seem logical? Do I need a new vent valve solenoid? The only thing that is throwing me for a loop is the code saying the circuit was open. I checked the fsm and really couldn't decide what to do.

 

Any comments would be greatly appreciated. Your advice has been priceless so far.

 

Thanks,

 

brc

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Open circuit suggests that the solenoid coil is burned out, the connector isn't making good contact, or a wire is cut somewhere. Could very well be the coil in the vent valve solenoid. I would run a continuity check on that component.

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Thanks for the info. I am going to tackle the project this Tuesday. I hope everything goes well with this project. But I am sure "I" will run into some problem. It just tends to happen with me :).

 

Thanks again for the info.

 

brc

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Hello every one. You can see the post I have been making about my 2008 Nissan Pathfinder evap system. To make a very long story short. The "service engine soon" light came on a couple of months ago. Found out it was a P0455 (evaporation leak). I bought two gas caps. One OEM from the Nissan Dealer. The code would always come back on. I studied the fsm and got great advice from the people on this message board.

 

 

A few weeks ago I took apart the entire evap systems and components. With my 12v tester I really didn't get the vent valve solenoid to work. Did not get the plunger to move up and down. I put everything back together and a new code showed up P0447 (Evaporation vent control circuit open. I would clear the code and as soon as you started it back up the "service engine soon" light would immediately come back on with the P0447.

 

 

Well today I bought a new vent valve solenoid. I got it on and cleared the code and the "service engine soon light" went off. I took it for a test drive and the light never came on while I was driving. When I got back home I turned the engine off so I could put it back in my shop (that is where I park it). Well after all that driving when I went to put it up the "service engine light soon" came on with the P0447 code.

 

 

I have no idea what it could be. I thought maybe a loose connection or something. The vent valve solenoid had quit working b/c before when I cleared the code the light would come back on immediately. Now it just comes on every now and then.

 

 

What could I be missing? What do I need to check? B/T gas caps and solenoid I have spent around a $140.00. I am about ready to put a piece of duct tape over the engine light. I feel like I am so close to fixing this issue, but with the engine light coming back on I feel like I have been wasting my time.

 

 

 

 

Thanks,

 

 

 

 

brc

 

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That sucks!

 

I'm not entirely familiar with the valve in question, but I have heard that carbon from the canister can get into the evap valves and cause problems there, especially if it's overfilled when gassing up. Maybe bits of charcoal jammed up your old one (or just kept it from sealing properly), and are trying to do the same to the new one but haven't fully stopped it up yet. Check the can, blow through the lines and see if anything comes out?

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Thanks for the replies. I took the evap canister apart again to check for any mistakes I may have made installing the new vent valve solenoid. You really have to disconnect everything on the evap system (which is located behind the driver's side rear wheel) to get to the top of the evap canister where the vent valve solenoid is located. I checked the hoses and especially the wiring harnesses that plug into the evap solenoid and the canister. Put everything back together and made sure everything was where it was suppose to be and all tight.

 

I drove it around all day Saturday with no "service engine soon" light to come on "so far". I think I had a loose connection on the vent valve solenoid. I think it was tight when I connected it. But in such a tight space you are working in and connecting all the hoses and other wiring harnesses then re-installing the evap canister. I think the vent valve solenoid connection became loose in the process.

 

Anyway, I will keep an eye on everything as I drive and hope the service engine soon light doesn't come back on. If it does I am really tempted to just put duct tape over the gage cover where the light is located just where I won't have to see it when I drive :).

 

Thanks everyone,

 

brc

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