DTC P0456 - Evaporative Emission Control System Leak Detected (Very Small Leak) -
WARNING: This page is about a different variant/trim than selected.
- DTC DETECTING CONDITION:
- Two consecutive driving cycles with malfunction
- TROUBLE SYMPTOM:
- Gasoline smell
- There is a hole of more than 0.5 mm (0.020 in) dia. in evaporation system or fuel tank.
CAUTION:
After repair or replacement of malfunctioning parts, conduct Clear Memory Mode < Ref. to
OPERATION , CLEAR MEMORY MODE > and INSPECTION MODE < Ref. to
OPERATION , INSPECTION MODE. >
- WIRING DIAGRAM:
DIAGNOSTIC PROCEDURE
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK ANY OTHER DTC ON DISPLAY. | Is any other DTC displayed? | Inspect the relevant DTC using "List of Diagnostic Trouble Code (DTC)". < Ref. to LIST OF DIAGNOSTIC TROUBLE CODE (DTC) . > | Go to step 2. |
2 CHECK 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.
|
Is the fuel filler cap tightened securely? | Go to step 3. | Tighten fuel filler cap securely. |
| 3 CHECK FUEL FILLER CAP. | Is the genuine fuel filler cap used? | Go to step 4. | Replace with a genuine fuel filler cap. |
| 4 CHECK FUEL FILLER PIPE PACKING. | Is there any damage to the seal between fuel filler cap and fuel filler pipe? | Repair or replace fuel filler cap and fuel filler pipe. < Ref. to FUEL FILLER PIPE . > | Go to step 5. |
5 CHECK DRAIN VALVE.
NOTE:
Drain valve operation can also be executed using Subaru Select Monitor. For the procedure, < Ref. to
COMPULSORY VALVE OPERATION CHECK MODE . >
|
Does drain valve produce operating sound? | Go to step 6. | Replace drain valve. < Ref. to DRAIN VALVE . > |
| 6 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, < Ref. to
COMPULSORY VALVE OPERATION CHECK MODE . >
|
Does purge control solenoid valve produce operating sound? | Go to step 7. | Replace purge control solenoid valve. < Ref. to PURGE CONTROL SOLENOID VALVE . > |
| 7 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, < Ref. to
COMPULSORY VALVE OPERATION CHECK MODE . >
|
Does pressure control solenoid valve produce operating sound? | Go to step 8. | Replace pressure control solenoid valve. < Ref. to PRESSURE CONTROL SOLENOID VALVE . > |
| 8 CHECK EVAPORATIVE EMISSION CONTROL SYSTEM LINE. Turn ignition switch to OFF. |
Is there a hole of more than 0.5 mm (0.020 in) dia. on evaporative emission control system line? | Repair or replace fuel line. < Ref. to FUEL DELIVERY, RETURN AND EVAPORATION LINES . > | Go to step 9. |
| 9 CHECK CANISTER. | Is canister damaged or is there a hole of more than 0.5 mm (0.020 in) dia. in it? | Repair or replace canister. < Ref. to CANISTER . > | Go to step 10 . |
| 10 CHECK FUEL TANK. Remove fuel tank. < Ref. to FUEL TANK . > |
Is fuel tank damaged or is there a hole of more than 0.5 mm (0.020 in) dia. in it? | Repair or replace fuel tank. < Ref. to FUEL TANK . > | Go to step 11 . |
| 11 CHECK ANY OTHER MECHANICAL TROUBLE IN EVAPORATIVE EMISSION CONTROL SYSTEM. | Are there holes of more than 0.5 mm (0.020 in) dia., cracks, clogging or disconnections of hoses or pipes in evaporative emission control system? | Repair or replace hoses or pipes. | Contact with SOA service center.
NOTE:
Inspection by DTM is required, because probable cause is deterioration of multiple parts.
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