DTC P0443 - EVAP System, Purge Control Valve Circuit Malfunction: Condition

WARNING: This page is about a different car, the 1997 Mazda Millenia. However, it is still accessible from the selected car via links, so may be relevant.

DTC is set when ECM voltage is greater than 11.5 volts when voltage is supplied to purge solenoid valve. When ECM voltage is less than 5.8 volts when no voltage is supplied to purge solenoid valve. Possible causes are:

Purge solenoid valve malfunction.
Open or short circuit between terminal "A" on purge solenoid valve and terminal "D" on main relay.
Open or short circuit between terminal "B" on purge solenoid valve and terminal No. 4O on Engine Control Module (ECM).