asand1

iTrader: (1)

I replaced my down stream O2 sensor this weekend and cleared the ECU after two years of not checking the codes. I just assumed the CEL was only for the O2.
Well the CEL popped up again with 0903,0304, and 0807. I know 0304 (KS) is bogus, triggered by the other two.
Could 0903 and 0807 share a common problem triggering both?

0903=EVAP Canister Vent Control Valve Circuit

0807=EVAP Canister Purge Control Valve/Solenoid Valve

DennisMik

iTrader: (2)

Maybe and maybe not. The 0903 is the valve bolted on to the EVAP canister that is behind the driver's side rear wheel. This valve has a plunger inside it that gets gummed up and won't slide. Many times people are able to take the valve off and free it up with something like WD40. But sometimes it is so bad you have to replace it. Fixing this may get rid of the 0807.

The 0807 is a valve bolted on the intake manifold. See page 13 in the FSM for location. Filtered air from the EVAP canister is sucked through this valve. But you could also have a bad EVAP canister where the charcoal granules are being sucked out of it by the Canister Purge Control Valve/Solenoid Valve. Take the valve off the engine and shake it. If granules come out, the EVAP canister is bad.

But take care of the 0807 code first.

asand1

iTrader: (1)

Thanks. The valve on the canister has a rusty shaft inside. I tried removing it to clean and oil but one of the thread inserts is spinning in the plastic canister. I placed a wtb in the classifieds.

Ok, I found a 97 200sx with what looks like the same canister and valve. The yard will let me pull it for a $10-15 iou. Gotta climb under my car and test mine now.

asand1

iTrader: (1)

I removed the whole canister and tested the valve with a battery. It would carry current but would not actuate. I turned the canister upside down and squirted some atf/oil mix into the valve and let it soak for a bit. Then I reached into the nipple with my hemostats and worked the shaft up and down. Testing again, the valve actuated and created a a perfect seal.

ECU cleared again and will know tomorrow if its fixed.

According to rockauto, the 97 20SX and 96 Maxima share the same valve, but different canisters. If the canister looks close enough i will grab both.

DennisMik

iTrader: (2)

If the old canister was leaking charcoal granules, you could still get the 0807 a couple of times because the granules are in the long metal tube from the rear of the car to the engine and will eventually be sucked into the engine. Nissan recommends that you blow air through the tube to clean it out. The FSM has a test to see is the canister is leaking, the bottom of page EC-22. You need good lung power for it.

There is a TSB on this also, NTB00-085a.

asand1

iTrader: (1)

I've got a compressor, I'll look into it. I did shake the canister and nothing was coming out of any of the nipples.

asand1

iTrader: (1)

This morning 0903 and 0304 came back. Will clear the lines and valves. May replace the canister and vent valve with the pull a part one too.

DennisMik

iTrader: (2)

Earlier you said that you shook the EVAP canister and nothing came out. I don't know if that is a valid test. The FSM and the service bulletin (NTB00-085a) both say to blow into the canister.

The way I discovered my canister was leaking was when I had the 0903 code was that since the code was for the EVAP Purge Volume Control Valve, I took it off the engine and charcoal particles fell out. I did the huff & puff routine with the canister and particles came out, but I don't recall ever trying to shake it.

maxprivate

iTrader: (12)

Have to revive this thread, I have an 0807 code. I checked the solenoid behind the rear tire and it actuates when I apply voltage and can blow air through the 2 black tubes, when I remove voltage no air can be blown through either tube so I assume that solenoid is good.

I checked the evap purge control valve attached to the charcoal canister with the 2 bolts and the little plunger moves freely. I sprayed WD40 in there anyway and tested it with 12v and the plunger moves freely but I noticed it doesn't fully seat all the way down. It seems there is 4 little metal tabs that wont allow the plunger to fully seat. I checked with a small screw driver to break them off but it appears those little tabs are supposed to be there.

Anyone know if there evap purge control valve is the same way with the little metal tabs on the bottom of the valve? or is it suppose to fully seat and those tabs not be there?
it really looks like those tabs are part of the valve on the insides.

maxprivate

iTrader: (12)

help! please!