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:
- Detected when two consecutive driving cycles with fault occur.
- GENERAL DESCRIPTION < Ref. to DTC P0456 EVAPORATIVE EMISSION CONTROL SYSTEM LEAK DETECTED (VERY SMALL LEAK) , Diagnostic Trouble Code (DTC) Detecting Criteria. >
TROUBLE SYMPTOM:
- Fuel odor
- There is a hole of more than 0.5 mm (0.020 in) dia. in evaporation system or fuel tank.
CAUTION:
After repairing or replacing the defective part, perform the Clear Memory Mode < Ref. to
OPERATION , Clear Memory Mode. > and Inspection Mode < Ref. to
PROCEDURE , Inspection Mode. >.
WIRING DIAGRAM:
DIAGNOSIS PROCEDURE
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK ANY OTHER DTC ON DISPLAY. | Is any other DTC displayed? | Check the appropriate DTC using the "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 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. | Securely install the fuel filler cap. |
| 3 CHECK FUEL FILLER CAP. | Is the fuel filler cap genuine? | 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 the 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 be executed using Subaru Select Monitor. For procedure, refer to "Compulsory Valve Operation Check Mode". < Ref. to
COMPULSORY VALVE OPERATION CHECK MODE . >
|
Does the drain valve operate? | Go to step 6. | Replace the drain valve. < Ref. to DRAIN VALVE . > |
| 6 CHECK PURGE CONTROL SOLENOID VALVE. Operate the purge control solenoid valve.
NOTE:
Purge control solenoid valve operation can be executed using Subaru Select Monitor. For procedure, refer to "Compulsory Valve Operation Check Mode". < Ref. to
COMPULSORY VALVE OPERATION CHECK MODE . >
|
Does the purge control solenoid valve operate? | Go to step 7. | Replace the purge control solenoid valve. < Ref. to PURGE CONTROL SOLENOID VALVE . > |
| 7 CHECK PRESSURE CONTROL SOLENOID VALVE. Operate the pressure control solenoid valve.
NOTE:
The pressure control solenoid valve operation can be executed using the Subaru Select Monitor. For procedure, refer to "Compulsory Valve Operation Check Mode". < Ref. to
COMPULSORY VALVE OPERATION CHECK MODE . >
|
Does the pressure control solenoid valve operate? | Go to step 8. | Replace the pressure control solenoid valve. < Ref. to PURGE CONTROL SOLENOID VALVE . > |
| 8 CHECK EVAPORATIVE EMISSION CONTROL SYSTEM LINE. Turn the ignition switch to OFF. |
Is there a hole of more than 0.5 mm (0.020 in) dia. in evaporation line? | Repair or replace the evaporation line. < Ref. to FUEL DELIVERY AND EVAPORATION LINES . > | Go to step 9 . |
| 9 CHECK CANISTER. | Is the canister damaged or is there a hole of more than 0.5 mm (0.020 in) dia. in it? | Repair or replace the canister. < Ref. to CANISTER . > | Go to step 10 . |
| 10 CHECK FUEL TANK. Remove the fuel tank. < Ref. to FUEL TANK . > |
Is the fuel tank damaged or is there a hole of more than 0.5 mm (0.020 in) dia. in it? | Repair or replace the 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, disconnections or bend of hoses or pipes in evaporative emission control system? | Repair or replace the hoses or pipes. | Contact the SOA service center. |