DTC P0446 - EVAP System Vent Control Circuit

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P0446 - EVAP SYSTEM VENT CONTROL CIRCUIT

Description:	This DTC sets when the signal moves outside the minimum or maximum allowable calibrated parameters for a specified EVAP canister vent valve duty cycle by PCM command.
Possible Causes:	VPWR circuit open KAPWR circuit open CANV circuit open CANV circuit short to ground CANV circuit short to voltage CANV circuit short to KAPWR Damaged EVAP canister vent valve Damaged PCM
Diagnostic Aids:	To verify normal function, monitor the EVAP canister vent valve 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.
Application	Key On Engine Off	Key On Engine Running	Continuous Memory
All	GO to PINPOINT TEST HX .