Quote:
Originally Posted by randy_k
Keith, I believe the connection at the top is what tells the DME that it's over it's below limit value. By looking at it.
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The top connection (red arrow) is what I took off and blew compressed air through several months ago, which appeared to clear my P0446 code. From post 13 in this thread, it appears to be the line marked #3 in that diagram.
The electrical connection underneath that (blue arrow) is what I think is the purge air valve, and marked #6 in that diagram. Anyone know of a way to test it? Since I had my right front fender liner out today to replace my radiator fan resistor, I activated the "fuel evaporative valve" in Durametric, but this valve didn't make any noise. Either it's super quiet, or it's broken.
Since I had Durametric out, checked for pending codes, sure enough, I had P0446 again! So, I blew compressed air through that upper line again. I also removed the connection at the bottom of the charcoal canister (the one towards the front of the car, appears to be ) and blew compressed air through that one. When I removed the air tool, I could hear air rushing back out. So I blew air through again, then when I removed the air tool, I put my finger over the opening in the line. Appears the air I blew into the line built up within the line and blew back out. Like, the line had inhaled and then exhaled. Is that normal for that line?
Let me know if I'm wrong here. I'll update as corrections need to be made. I'm basing all this on the not so clear diagram (it's hard to trace those lines!) and the explanations from JPF in this thread. Appears vapors from the fuel tank enter the EVAP system through the red lines, through #5 the pressure sensor and travel to the bottom rearmost connection of the charcoal canister. Then the vapors leave the canister through the bottom frontmost connection and travel up to the filler neck colored green, passing through #9 the vacuum control valve, and onto #7 the operating purge valve. From there the vapors follow the route of the gray line, into #1 the purge valve, and ultimately to #8 the intake manifold, where the vapors get burned in the normal combustion cycle. #3 purge air, appears to just be a vent for the charcoal canister?
So Randy, guess I'm back in the same boat as you. Gotta figure out why we're getting these P0446 codes...