P1443 pretty much means that the purge flow sensor isn't showing the right data for when the evap purge is opening. The purge flow sensor is just a thermistor and measures the temperature change of the air going through it.
When the computer determines its time to open up the purge solenoid it allows 12v to the purge solenoid to open allowing engine vacuum to pull the gas fumes from the evap canister into the intake manifold.
The purge flow sensors measures this flow by sensing the difference in temperatures in the line. The line temp cools as air is being pulled over the sensor, thus the sensor gives data back to the PCM that there IS flow.
I would check the lines, disconnect the solenoid and apply 12v to it to see if it opens. If both of these check out replace the sensor.
Quality Engineer (Electronics) for Kia Motors
University of Tennessee Electrical Engineering Graduate
2000 XLT 2.5L A/T