P1443 - Very Small Or No Purge Flow Condition
Description:
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.
Possible Causes:
*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).
Diagnostic Aid:
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.
Hope this helps!