Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
DTC P1443: EVAP System Vent Control Function Problem
2002 Subaru Forester BaseSECTION DTC P1443: EVAP System Vent Control Function Problem
NOTE:
This diagnostic procedure is written for scan tool operation. Drain valve can be operated by performing compulsory valve operation if Subaru Select Monitor is being used. See COMPULSORY VALVE OPERATION CHECK MODE under SELF-DIAGNOSTIC SYSTEM.
- Perform test procedure. See TESTING PROCEDURE . If DTC P1443 is only DTC set, go to next step. If any other DTCs exist, diagnose and repair those DTCs first. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . Clear memory. See CLEARING DIAGNOSTIC TROUBLE CODES . On Forester, Legacy and Outback models, validate repair by performing appropriate drive cycle. See DRIVE CYCLES . On Impreza and Outback Sport, perform verification procedure. See VERIFICATION PROCEDURE .
- Check EVAP system for clogged vent hoses between canister and drain valve and between drain valve and air filter. Also check for clogged drain filter. See appropriate EVAP vacuum diagram in VACUUM DIAGRAMS article. If there is no fault in EVAP vent system, go to next step. If there is a fault in EVAP vent system, repair or replace faulty hose and/or component. Clear memory. See CLEARING DIAGNOSTIC TROUBLE CODES . On Forester, Legacy and Outback models, validate repair by performing appropriate drive cycle. See DRIVE CYCLES . On Impreza and Outback Sport, perform verification procedure. See VERIFICATION PROCEDURE .
- Turn ignition off. Connect 2-pin Green test connector located under left side of instrument panel (near center of instrument panel on Legacy and Outback). See Figure, Figure and Figure . Turn ignition on. Using a scan tool, activate drain valve. If drain valve operates, contact authorized Subaru dealership because probable cause is deterioration of multiple parts. If drain valve does not operate, replace drain valve. Clear memory. See CLEARING DIAGNOSTIC TROUBLE CODES . On Forester, Legacy and Outback models, validate repair by performing appropriate drive cycle. See DRIVE CYCLES . On Impreza and Outback Sport, perform verification procedure. See VERIFICATION PROCEDURE .
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.