DTC P0446:00: Notes

DTC P0446:00	CV solenoid valve control circuit problem
DETECTION CONDITION	Monitors the CV solenoid valve 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 the PCM command. Diagnostic support note This is a continuous monitor (CCM). The check engine light illuminates if the PCM detects the above malfunction condition in two consecutive drive cycles or in one drive cycle while the DTC for the same malfunction has been stored in the PCM. PENDING CODE is available if the PCM detects the above malfunction condition during first drive cycle. FREEZE FRAME DATA (Mode 2)/Snapshot data is available. The DTC is stored in the PCM memory.
FAIL-SAFE FUNCTION	-
POSSIBLE CAUSE	CV solenoid valve connector or terminals malfunction CV solenoid valve malfunction Short to ground or open circuit in CV solenoid valve power supply circuit Short to ground in wiring harness between ENG BAR 15 A fuse and CV solenoid valve terminal B ENG BAR 15 A fuse malfunction Open circuit in wiring harness between main relay terminal C and CV solenoid valve terminal B Short to ground in wiring harness between CV solenoid valve terminal A and PCM terminal 1M PCM connector or terminals malfunction Short to power supply in wiring harness between CV solenoid valve terminal A and PCM terminal 1M Open circuit in wiring harness between CV solenoid valve terminal A and PCM terminal 1M PCM malfunction
Courtesy of MAZDA MOTORS CORP.