DTC P0446: EVAP Control System Canister Vent Solenoid Circuit Malfunction

WARNING: This page is about a different car, the 2006 Mercury Mariner and 2006 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.

P0446 - EVAP CONTROL SYSTEM CANISTER VENT SOLENOID CIRCUIT MALFUNCTION

Description:	Monitors the canister vent (CV) solenoid circuit for an electrical failure. The test fails when the signal moves outside the minimum or maximum allowable calibrated parameters for a specified canister vent duty cycle by PCM command.
Possible Causes:	VPWR circuit open. CV solenoid circuit shorted to PWR GND or CHASSIS GND. Damaged CV solenoid. CV solenoid circuit open. CV solenoid circuit shorted to VPWR.
Diagnostic Aids:	To verify normal functioning, monitor the EVAP canister vent solenoid signal PID EVAPCV and the signal voltage (PCM control side). With the valve open, EVAPCV indicates 0% duty cycle and a voltage approximately equal to battery voltage. When the valve is commanded fully closed, EVAPCV indicates 100% duty cycle, and a minimum voltage drop of 4 volts is normal. Output test mode may be used to switch output on/off to verify function.
Application	Key On Engine Off	Key On Engine Running	Continuous Memory
All	GO to Pinpoint Test HX .