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Home >> Ford >> 2000 >> Contour SE, 2.5 L, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 753 (Engine Controls - Powertrain DTC Charts & Descriptions - CNG, Flex-Fuel & Gasoline) >> Diagnostic Trouble Code (DTC) Charts >> P0446: EVAP Control System Canister Vent Solenoid Circuit Malfunction

P0446: EVAP Control System Canister Vent Solenoid Circuit Malfunction

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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.
  • 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. 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: EVAPORATIVE EMISSION (EVAP) MONITOR AND SYSTEM Step 34.
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