The voltage will come from a fuse not the pcm the ground control comes from the pcm.
January, 5, 2013 AT 6:36 PM
Yes, leakage is normal for the vent. It is normally open and closes only when testing the system
12 volt feed from fuse box is the power to the solenoid, return voltage is what you are looking for. It should be 12 volts, the pcm controls the ground
January, 5, 2013 AT 6:38 PM
When they did the smoke test the vent valve would have been closed so leakage from the vent valve shouldn't have been there.
January, 5, 2013 AT 6:43 PM
Saturn, it would have to commanded closed to not leak. It is normally open. If they smoked it without commanding it closed, it will vent smoke
January, 5, 2013 AT 6:57 PM
I know how to do a smoke test and if it was done correctly they would have commanded the valve closed or used a jumper lead to close it.
January, 5, 2013 AT 9:32 PM
Sorry, thought I was helping
January, 6, 2013 AT 10:28 PM
Hello Saturntech9 and ASEMaster6371.
I have some interesting news that I think is the culprit for the check engine light. Here are some particulars.
1. Conducted the voltage check on the wire harness for the C51-2-18 terminal location. Yesterday I had to go out and get me a new multimeter because the old one I was using was cheap and I believe I fried the circuitry inside of it doing some high power stuff. Most likely I blew a fuse inside of the darn thing. Anyways I hooked up the new multimeter leads to the C51-2-18 teminal and grounded everything and I got a voltage reading of zero (0). So there is no confusion, I had the ingition switch turned to ON. Reading was 0 volts. Should of been 10 to 14 volts.
2. Looked at another terminal to make sure I was using the new multimeter correctly and I got a proper voltage reading for that particular terminal. So multimeter was working correctly.
3. Decided to look up under the car where the evaporator canister is located along with the solenoid valve. Looked at the electrical connection where the wire was going into the connector that plugged into the solenoid valve. In past when I purchased the car, I noticed that these wires were exposed and I taped up this area fairly well with black tape. I unwrapped the black tape and there it was. A BROKEN WIRE. Yes this wire is the same wire that goes to the C51-2-18 terminal and it is light purple with a red stripe. The wire is completely separated. I have about an inch of wire coming out of the connector and I need to splice that to the remaining wire.
4. I did look at the old solenoid valve I have an the resistance was 27 ohms, and the manual states is should be 28 to 30 The new valve read 26.3 ohms. Most likely the old valve is still functional.
5. I fixed the broken wire by using a crimp section. The check engine light ceased coming on and I am finally rid of the dreaded P0449 code.
I would like to thank both of you for your inputs and most of all your professionalism in helping me solve this problem.
Enjoy your New Years and God Bless.
January, 7, 2013 AT 12:09 AM
Your welcome that's what were here for glad to hear you got the problem fixed.I see why the smoke was escaping now the vent solenoid was never closed when they did the test. They should have caught that while doing the smoke test. When they jumped a ground wire to the solenoid they should have caught that the solenoid didn't make a thumping noise when closing it. Sounds like you need to find another person to repair your vechile you found a problem the shop couldn't find.