DTC P0446: Evaporative Emission System Vent Control Circuit

P0446 - EVAPORATIVE EMISSION SYSTEM VENT CONTROL CIRCUIT

Description:	Monitors the EVAP canister vent solenoid circuit for an electrical failure. The test fails when the signal moves outside the minimum or maximum allowable calibrated parameters for a specified EVAP canister vent duty cycle by powertrain control module (PCM) command.
Possible Causes:	VPWR circuit open KAPWR circuit open CANV circuit short to ground Damaged EVAP canister vent solenoid CANV circuit open CANV circuit short to voltage CANV circuit short to KAPWR Damaged PCM
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.
Application	Key On Engine Off	Key On Engine Running	Continuous Memory
All	GO to PINPOINT TEST HX .