DTC P0446: Evaporative Emission Control System Vent Control Circuit: Description

To judge if there is an open circuit in the evaporative emission ventilation solenoid drive circuit, ECM (M/T) or PCM (A/T) measures the surge voltage of the evaporative emission ventilation solenoid coil. The ECM or PCM drives the evaporative emission ventilation solenoid for 30 milliseconds. After the solenoid is turned off, the ECM or PCM will check if the solenoid coil produces a surge voltage of 2 volts or more.