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

WARNING: This page is about a different car, the 2002 Mazda Protege5 and 2002 Mazda Protege. However, it is still accessible from the selected car via links, so may be relevant.

DTC is set when PCM detects input voltage from purge solenoid valve stays to low or to high. This is a diagnostic support DTC, monitored once per ignition key cycle. MIL is not illuminated when PCM detects malfunction. Possible causes are:

Open circuit between main relay and purge solenoid valve.
Open or short circuit between purge solenoid valve and PCM.
PCM malfunction.
Purge solenoid valve malfunction.