Service Engine Soon - P0440 code - Nissan Forum
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#1 Old Nov 3rd, 2004, 12:52 PM
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Service Engine Soon - P0440 code

Hi there,

I have a 97 Nissan King Cab 4wd and recently the Service Engine Light came on. I had a diagnostic which returned the code of P0440 which is "Evaporative Emission Control System Malfunction." I spoke with someone at the Nissan dealer and they stated it has something to do with EVAP System Small Leak Code and it can be one of two things. 1- The gas cap is loose (I know this isn't the case) or 2- it has something to do with the EVAP cannister (charcoal cannister). The mechanic stated he would charge me $145 for a more detailed diagnostic to see what's going on. I'm trying to avoid that and see if any of you have suggestions on what exactly needs to be done with the EVAP cannister.

Thanks!

Jeff
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#2 Old Nov 4th, 2004, 06:30 AM
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I had the same problem on a 97 path and I had to replace the EVAP control valve and canister because the valve is mounted to the canister and the mounting screws were rusted , it seems to happen to all nissans.
#3 Old Nov 4th, 2004, 06:55 AM
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You might still try a new gas cap even though it is on tight. The gas cap is not just a straight seal, it's a valve designed to open at the proper pressure and vacuum. They can get stuck open or open at a lower pressure yet still be screwed on tight causing the leak and the P0440 code. If you get a new one make sure it's OEM from the dealer.

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#4 Old Jul 7th, 2005, 02:01 PM
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P0440

My 98 Altima threw the same P0440 code at 86k miles. After resetting the MIL, the light would come back on after 2-3 days. I also noticed that the light would go off if I traveled >60 miles in one shot and it also did not appear when the temperature was <30 degrees F.

At first, I replaced the gas cap with a OEM from the dealer --- no help. I finally solved the problem by removing the EVAP control valve (which is located on the front of the canister -- it removes w/ 2 screws, a hose, & electric connection) and performing a little surgery on it. Once it is off, I noticed that the valve moved with extreme difficulty --- I had to use a screwdriver to move it. By applying WD40 and working the valve back and forth, i finally got it to a point where it flowed fluidly. Just remember to keep working the valve to the point where the valve will close by itself and it makes a small "swoosh" noise... you'll know what i mean when you get there. Also be sure to check the rubber O-ring and make sure it doesn't have any imperfections on it. If you're not sure, goto the automotive store and purchase a new one for 33 cents.

It's been roughly 2 weeks and my MIL has remained off.


Quote:
Originally Posted by doogler
Hi there,

I have a 97 Nissan King Cab 4wd and recently the Service Engine Light came on. I had a diagnostic which returned the code of P0440 which is "Evaporative Emission Control System Malfunction." I spoke with someone at the Nissan dealer and they stated it has something to do with EVAP System Small Leak Code and it can be one of two things. 1- The gas cap is loose (I know this isn't the case) or 2- it has something to do with the EVAP cannister (charcoal cannister). The mechanic stated he would charge me $145 for a more detailed diagnostic to see what's going on. I'm trying to avoid that and see if any of you have suggestions on what exactly needs to be done with the EVAP cannister.

Thanks!

Jeff
#5 Old Sep 3rd, 2012, 02:50 PM
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P0440 97 Nissan 4x4

Phillyp had nice notes; Thanks!

I also added an “air filter” I had to the air-intake. Look for “filter” or “pneumatic exhaust mufflers” on internet/McMaster-Carr. Plastic “Easy-to-Clean Mufflers” aren’t too expensive.

Good luck.
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#6 Old Sep 3rd, 2012, 03:23 PM
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The P0440 code simply mean the system detects a leak....often referred to the "gas cap code" because an incorrectly installed gas cap will cause the code to set. Any leak in the system can cause the code to set, so any split/cut/disconnected hose, a leaking sending unit "O" ring, stuck open canister vent control valve, bad evap pressure sensor, leaking fuel filler tube, bad gas cap vent, etc., will be a possible cause. Sometimes the liner of the evap canister will fail and small bits of charcoal can get sucked into the system and create problems. Gas cap failure is relatively rare; vent control valve failure is pretty common. It's also important to note there were two different style vent control valves and, subsequently, two different canisters, so you must get the correct vent control valve to match the canister if replacing it. The old style valve mounted flush against the canister and the canister had a groove on the back where the "O" seal sits in. The newere style valve has an extension with the "O" seal on it that slides into the back of the canister. Also, if you use your Hbody for hauling a boat and use it to lower it into the water, water can enter into the canister. Nissan came out with an updated water seperator system to address this issue; there's a TSB on it. If the leak is hard to find, then a smoke machine is a mechanic's best friend. It'll hook up to the EVAP test port in the engine compartment. The vent control valve is closed via a scan tool and smoke is sent through the EVAP system to help pinpoint the leak. This is an expensive piece of equipment so it may be tough to find a shop that has one outside of a dealership.
#7 Old Sep 7th, 2012, 11:52 PM
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Quote:
Originally Posted by bobr97Nissan View Post
Phillyp had nice notes; Thanks!

I also added an “air filter” I had to the air-intake. Look for “filter” or “pneumatic exhaust mufflers” on internet/McMaster-Carr. Plastic “Easy-to-Clean Mufflers” aren’t too expensive.

Good luck.
I should be more specific: I added the "air filter" to the air-intake (hose) that goes to the valve Phillyp mentions in the post above. My valve (located on the canister above the spare tire on my 97 Nissan 4x4) was rather dirty.
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