code P0446 Evap systemvent control circuit on 1996 Lexus LS400

Says:
1.open or short circuit
2.poor electrical connection
3.faulty vent solenoid

where is this located so I can check it, and how should I determine if it is 1 or 3

Asked by for the 1996 Lexus LS400
1 answer
check your gas cap...bad one or loose?