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P1451 - Evaporative Emission System Vent Control Circuit

WARNING: This page does not describe the selected car, but rather 32 other vehicles, including the 2007 Mercury Mountaineer, 2007 Mercury Monterey, 2007 Mercury Montego, 2007 Mercury Milan, and 2007 Mercury Mariner. However, it is still accessible from the selected car via links, so may be relevant.
P1451 - EVAPORATIVE EMISSION SYSTEM VENT CONTROL CIRCUIT

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 powertrain control module (PCM) command.
Possible Causes: 
  • VPWR circuit open
  • CV solenoid circuit short to PWR GND or CHASSIS GND
  • Damaged CV solenoid
  • CV solenoid circuit open
  • CV solenoid circuit short to VPWR
Diagnostic Aids:  To verify normal functioning, monitor the evaporative emission (EVAP) CV solenoid signal PID EVAPCV and the signal voltage on the PCM control side. With the valve open, the EVAPCV PID indicates 0% duty cycle and a voltage approximately equal to battery voltage. When the valve is commanded fully closed, the EVAPCV PID indicates 100% duty cycle, and a minimum voltage drop of 4 volts is normal. Output test mode may be used to switch the output on and off to verify function.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
All refer to PINPOINT TEST HX .
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