Detection Condition
WARNING: This page is about a different car, the 2002 Mazda B4000, 2002 Mazda B3000, and 2002 Mazda B2300. However, it is still accessible from the selected car via links, so may be relevant.
DTC P1451 indicates self-test has detected a CV solenoid circuit failure. Canister Vent (CV) solenoid seals EVAP canister from atmospheric pressure during the EVAP test monitor. This allows EVAP canister purge valve to obtain the target vacuum in the fuel tank during monitor run.