Update on my EVAP problem/Did I find the answer?

[brc19761]

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

[4xq]

An open circuit means there is no continuity.

If you haven't done it yet, check the drain valve as per the instructions on page EC-247 of the fsm, and make sure the hose going to the vent canister is clear.

Next, pull the connector off of the vent valve. Check pin 1 of the wiring connector for battery voltage as per item 3 on page EC-245.

If that is ok, then you have voltage to the valve. There are two possible problems left:
Either the valve is bad, or the grounding connection back to the ECM is bad. There is about a 98% chance it is a bad valve, so at this point pull the valve out and test it by applying battery voltage to pin 1, and grounding pin 2 as per EC 247. The plunger needs to move.

Probably the valve will test bad, so go to reatilmenot and look up coupons for Autozone. There is a 15.00 off 60.00 or a 20% off of 100.00 right now. You need to order online and pick up in store to get that.

Pretty sure that will get you fixed up unless you have a really weird problem.

[brc19761]

Thanks so much for the info. I had no idea I needed to check all the things listed. I definitely could have messed things up putting everything back together. The location of the canister and all of the evap components are not the easiest to get to.

I will take it apart again and look for anything out of place, in the wrong spot, or connected wrong. Then I will test the harness and everything else you pointed out.

Thanks for the info about the deals at Autozone.

Thanks,

brc

[4xq]

Ur welcome for the coupon idea! Let us know how it works out!

[brc19761]

Going to tackle it Tuesday (only time I have to do it this week). I hope it goes well, but I always run into trouble trying to fix anything . I will let you know how it goes,

[gordon.su]

could it be the charcoal canister? that solved my own evap mystery code

[brc19761]

I do not think it is the canister itself. I am betting on the vent valve control solenoid. I was suppose to tackle the project yesterday, but my plans got changed which left me no time to work on it. What model Pathfinder/Infinity do you have?

brc