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EC-326 < DTC/CIRCUIT DIAGNOSIS > [VQ35DE] P0456 EVAP CONTROL SYSTEM 2. Check for genuine NISSAN fuel filler cap design. Is the inspection result normal? YES >> GO TO 2. NO >> Replace with genuine NISSAN fuel filler cap. Refer to 2. CHECK FUEL FILLER CAP INSTALLATION Check that the cap is tightened properly by rotating the cap clockwise. Is the inspection result normal? YES >> GO TO 3. NO >> Open fuel filler cap, then clean cap and fuel filler neck threads using air blower. Then retighten until reteaching sound is heard. 3. CHECK FUEL FILLER CAP FUNCTION Check for air releasing sound while opening the fuel filler cap. Is the inspection result normal? YES >> GO TO 5. NO >> GO TO 4. 4. CHECK FUEL TANK VACUUM RELIEF VALVE EC-329, "Component Inspection" Is the inspection result normal? YES >> GO TO 5. NO >> Replace fuel filler cap with a genuine one. Refer to 5. CHECK FOR EVAP LEAK . Is there any leak in EVAP line? YES >> Repair or replace. NO >> GO TO 6. 6. CHECK EVAP CANISTER VENT CONTROL VALVE Check the following. • EVAP canister vent control valve. EC-303, "Component Inspection" . Is the inspection result normal? YES >> GO TO 7. NO >> Repair or replace EVAP canister vent control valve and O-ring. Refer to . 7. CHECK IF EVAP CANISTER SATURATED WITH WATER SEF915U |