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Home >> Ford >> 2012 >> Explorer Base, 3.5 8, AWD, 6F50 >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Controls (Except Diesel & Hybrid) - Powertrain DTC Descriptions - DTC P0193 - P0563 >> DTC P0446: Evaporative Emission System Vent Control Circuit

DTC P0446: Evaporative Emission System Vent Control Circuit

P0446 - EVAPORATIVE EMISSION 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 
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