P1443 - Very Small Or No Purge Flow Condition. A fuel tank pressure change greater than a minus (-) 7 inches of H 2 O in 30 seconds has occurred with purge (fuel vapor) flow less than 0.02 pounds per minute.
*Blocked fuel vapor hose between EVAP canister purge valve and FTP sensor.
*Blocked fuel vapor hose between EVAP canister purge valve and engine intake manifold.
*Blocked vacuum hose between EVAP canister purge valve-solenoid and engine intake manifold.
*EVAP canister purge valve stuck closed (mechanically).
This is all taken from CliffyK's link and is 100% correct. This is what causes the P1443 code! To fix it, just like Cliff said "Check for blockages between the fuel tank, EVAP canister purge valve and engine intake manifold. Check obstructions in the EVAP canister purge valve diaphragm and ports."
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