P1447 - Evaporative Emission (EVAP) Control System, Purge Flow Monitor
In this evaporative emission (EVAP) control system, purge flow occurs
during non-closed throttle conditions. Purge volume is related to air
intake volume. Under normal purge conditions (non-closed throttle), the
EVAP canister purge volume control solenoid valve is open to admit purge
flow. Purge flow exposes the EVAP control system pressure sensor to
intake manifold vacuum.
Under normal conditions (non-closed throttle), sensor output voltage
indicates if pressure drop and purge flow are adequate. If not, a fault
is determined. Malfunction is detected when EVAP control system does not
operate properly, EVAP control system has a leak between intake
manifold and EVAP control system pressure sensor.
Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
Possible causes
* EVAP canister purge volume control solenoid valve stuck closed
* EVAP control system pressure sensor and the circuit
* Loose, disconnected or improper connection of rubber tube
* Blocked rubber tube
* Cracked EVAP canister
* EVAP canister purge volume control solenoid valve circuit
* Closed throttle position switch
* Blocked purge port
* Closed throttle position switch
Test is and send us your updated.
My experience with my own 97 Pathfinder was that the EVAP canister internally ruptured, spreading charcoal pellets throughout connected portions of the vacuum system.
The tech replaced the EVAP canister and blew lines out with compressed air, but the P1447 code came back.
A few weeks later I had the tech check why the P1447 code came back, and he determined that the EVAP Canister Purge Volume Control Solenoid Valve had failed, as it did not pass certain resistance measurement tests. He replaced the valve, $288 + labor, blew a few remaining carbon bits out, and the problem seems to be fixed.
I kind of choked at the $288 price though, and took the part home. Two screws to pop it open. Turns out it was filled (surprise) with pulverized charcoal dust and would not operate.
The valve is a little rotating magnet that turns and screws a lipstick-style plunger up and down. I tapped out all the carbon and then started turning the bearings, which were crunchy sounding. However, the carbon eventually gave way to the bearings and they're spinning just fine now. I haven't tested the part, but from the simplicity of it, I have no doubt it would get me down the road many more miles.
I got the same p1447 on my 97 pathfinder b/c my service engine light is on. the mechanic showed me the part and the charcoal pieces! I found a purge monitor for around $60 online. that sounds significantly cheaper so im wondering if another part goes with this?
I took the little valve apart (can. pur.vcsv) and found it full, of carbon, cleaned it out and it now works. Had lots of carbon in the system so took the charcoal canister off and carefully sawed the top off. The canister has two compartments and are connected at the bottom. The carbon is small granules and over years had settled in the bottom of the canister( remember now the canister is on its side). the springs that push against the stainless steel plate had dropped down and cocked the plate. this allowed the carbon to get into the lines. I'm going to repack the canister and reverse the foam filters to use the good side then put a kitchen sponge that has the scotchbrite on it in there too so i'll be sure no more carbon will get out. I'm going to use activated carbon that goes into my fish tank filter. its the same stuff. then i'm going to RTV the outside seams and let it set up. I will also tie wrap the canister tight as the springs will want to push it apart. i have some pictures to add if i can.
did your repair work? I have a 96 Nissan XE and found carbon pellets in my system. After reading your post I removed canister and YES, the carbon pellets are loosed to the system. would love to hear if your repairs worked well.
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