P0440

AH: DTC P0440 - EVAPORATIVE EMISSION CONTROL SYSTEM MALFUNCTION

DTC DETECTING CONDITION:
- Two consecutive driving cycles with fault.

TROUBLE SYMPTOM:
- Gasoline smell.

CAUTION: After repair or replacement of faulty parts, conduct CLEAR MEMORY MODE and INSPECTION MODE. Refer to How To Clear Diagnostic Trouble Codes. Clearing Diagnostic Trouble Codes





WIRING DIAGRAM

10AH1: CHECK ANY OTHER DTC ON DISPLAY.

CHECK: Is there any other DTC on display?

YES: Inspect the relevant DTC using "10. Diagnostics Chart with Trouble Code".

NO: Go to step 10AH2.

10AH2: CHECK FUEL FILLER CAR
1. Turn ignition switch to OFF.
2. Check the fuel filler cap.

NOTE: The DTC code is stored in memory if fuel filler cap is or was loose or if the cap chain was caught while tightening.

CHECK: Is the fuel filler cap tightened securely?

YES: Go to step 10AH3.

NO: Tighten fuel filler cap securely.

10AH3: CHECK FUEL FILLER PIPE PACKING.

CHECK: Is there any damage to the seal between fuel filler cap and fuel filler pipe?

YES: Repair or replace fuel filler cap and fuel filler pipe.

NO: Go to step 10AH4.

10AH4: CHECK DRAIN VALVE.




1. Connect test mode connector.
2. Turn ignition switch to ON.




3. Operate drain valve.

NOTE: Drain valve operation can also be executed using Subaru Select Monitor. For the procedure, Refer to "COMPULSORY VALVE OPERATION CHECK MODE".

CHECK: Does drain valve produce operating sound?

YES: Go to step 10AH5.

NO: Replace drain valve.

10AH5: CHECK PURGE CONTROL SOLENOID VALVE




Operate purge control solenoid valve.

NOTE: Purge control solenoid valve operation can also be executed using Subaru Select Monitor. For the procedure, Refer to "COMPULSORY VALVE OPERATION CHECK MODE".

CHECK: Does purge control solenoid valve produce operating sound?

YES: Go to step 10AH6.

NO: Replace purge control solenoid valve.

10AH6: CHECK PRESSURE CONTROL SOLENOID VALVE.




Operate pressure control solenoid valve.

NOTE: Pressure control solenoid valve operation can also be executed using Subaru Select Monitor. For the procedure, Refer to "COMPULSORY VALVE OPERATION CHECK MODE".

CHECK: Does pressure control solenoid valve produce operating sound?

YES: Go to step 10AH7.

NO: Replace pressure control solenoid valve.

10AH7: CHECK EVAPORATIVE EMISSION CONTROL SYSTEM LINE.
Turn ignition switch to OFF.

CHECK: Does fuel leak in fuel line?

YES: Repair or replace fuel line.

NO: Go to step 10AH8.

10AH8: CHECK CANISTER.

CHECK: Is there any damage at canister?

YES: Repair or replace canister.

NO: Go to step 10AH9.

10AH9: CHECK FUEL TANK.
Remove fuel tank.

CHECK: Is there any damage at fuel tank?

YES: Repair or replace fuel tank.

NO: Go to step 10AH10.

10AH10: CHECK ANY OTHER MECHANICAL TROUBLE IN EVAPORATIVE EMISSION CONTROL SYSTEM.

CHECK: Are there holes, cracks, clogging or disconnections of hoses or pipes in evaporative emission control system?

YES: Repair or replace hoses or pipes.

NO: Contact with Subaru of America (SOA) service.

NOTE: Inspection by Subaru of America's DTM is required, because probable cause is deterioration of multiple parts.