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Kenny Z.
Kenny Z., Ford Senior Master Tech
Category: Ford
Satisfied Customers: 5536
Experience:  Auto Trans, Drivability and Electrical Specialist
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2006 Ford Freestar PO446

Customer Question

2006 Ford Freestar
Submitted: 1 year ago.
Category: Ford
Expert:  Kenny Z. replied 1 year ago.

Hello, my name is***** and thanks for your question.

P0446 is indicating a concern with the canister vent solenoid circuit. The solenoid on the firewall is the canister purge solenoid. The canister vent solenoid is located at the rear of the vehicle, it is attached to the fuel filler neck. To access you need to remove the left hand rear wheel well splash shield. I would remove that and inspect the wiring for any damage. If none found then you can replace the vent solenoid. It is possible there is a concern elsewhere in the circuit or powertrain control module. To properly diagnose you would need an advanced scanner that can actuate the solenoid to test for power and ground signal from the PCM.

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Customer: replied 1 year ago.
Okay I will do this now.
Expert:  Kenny Z. replied 1 year ago.

Ok sounds good.

Customer: replied 1 year ago.
I cant get the part until 3:00 as soon as I get it I will install it and get back to you then.
Expert:  Kenny Z. replied 1 year ago.

OK sounds good. Best of luck!

Customer: replied 1 year ago.
I installed the new valve and the light came back on and set the code again.
Expert:  Kenny Z. replied 1 year ago.

Has to be wiring or PCM concern, as I stated before you need a scanner that can activate the solenoid for circuit testing.

Customer: replied 1 year ago.
There is only 2 wires to the valve. Cant the wires be tested? The red wire has constant voltage so I assume the purple has a ground created by the PCM?
Customer: replied 1 year ago.
I grounded the purple wire and the valve closed so that is how it works. So I need to know which wire on the PCM operates the purple wire ???
Expert:  Kenny Z. replied 1 year ago.

same color wire pin #67

Customer: replied 1 year ago.
Do you have a schematic of the plug with the numbers?
Customer: replied 1 year ago.
I fixed it. I ran a ground wire from the PCM to the valve and the engine light went out and stayed out. So the wire was the problem. I usually have good success with this service but I guess it just depends on the skill level of the tech helping me. You can ALWAYS test wires for continuity and voltage without an expensive meter or scanner. Thanks anyway.
Expert:  Kenny Z. replied 1 year ago.

Agreed, but if the wire ohms out then what? How can you test if the ground driver is working?