DTC P0455: EVAP System (CPC) Leak Detected (Large Leak): Notes

DTC detecting condition:

Detected when two consecutive driving cycles with fault occur.

Trouble symptom:

Fuel odor
There is a hole of more than 1.0 mm (0.04 in) dia. in evaporation system or fuel tank.
Fuel filler cap loose or lost

CAUTION: After servicing or replacing faulty parts, perform Clear Memory Mode Ref. to ENGINE (DIAGNOSTICS) (EXCEPT FOR STI)>Clear Memory Mode>OPERATION , and inspection mode Ref. to ENGINE (DIAGNOSTICS) (EXCEPT FOR STI)>Inspection Mode>PROCEDURE .

CHECK FUEL FILLER CAP .
1. Turn the ignition switch to OFF.
2. Check the fuel filler cap.
  NOTE: The DTC is stored in memory if fuel filler cap is or was loose or if the cap chain has caught while tightening.
Is the fuel filler cap tightened securely?

Yes: Go to 2.

No: Tighten fuel filler cap securely.
CHECK FUEL FILLER CAP .
Check the fuel filler cap.

Is the fuel filler cap genuine?

Yes: Go to 3.

No: Replace with a genuine fuel filler cap.
CHECK FUEL FILLER PIPE GASKET .
Check the fuel filler pipe gasket.

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

Yes: Repair or replace the fuel filler cap and fuel filler pipe. Ref. to FUEL INJECTION (FUEL SYSTEMS) (EXCEPT FOR STI)>Fuel Filler Pipe .

No: Go to 4.
CHECK PURGE CONTROL SOLENOID VALVE .
Check air-tightness of the purge control solenoid valve. Ref. to EMISSION CONTROL (AUX. EMISSION CONTROL DEVICES) (EXCEPT FOR STI)>Purge Control Solenoid Valve>INSPECTION .

Is the check result OK?

Yes: Go to 5.

No: Replace the purge control solenoid valve. Ref. to EMISSION CONTROL (AUX. EMISSION CONTROL DEVICES) (EXCEPT FOR STI)>Purge Control Solenoid Valve .
CHECK EVAPORATIVE EMISSION CONTROL SYSTEM LINE .
Check the line of evaporative emission control system.

Are there holes on the evaporation line?

Yes: Repair or replace the evaporation line. Ref. to FUEL INJECTION (FUEL SYSTEMS) (EXCEPT FOR STI)>Fuel Delivery and Evaporation Lines .

No: Go to 6.
CHECK CANISTER .
Check the canister.

Are there holes on the canister?

Yes: Replace the canister. Ref. to EMISSION CONTROL (AUX. EMISSION CONTROL DEVICES) (EXCEPT FOR STI)>Canister .

No: Go to 7.
CHECK LEAK CHECK VALVE ASSEMBLY .
Check the leak check valve assembly.

Are there damage or holes on the leak check valve assembly?

Yes: Replace the leak check valve assembly. Ref. to EMISSION CONTROL (AUX. EMISSION CONTROL DEVICES) (EXCEPT FOR STI)>Leak Check Valve Assembly .

No: Go to 8.
CHECK FUEL TANK .
Remove the fuel tank. Ref. to FUEL INJECTION (FUEL SYSTEMS) (EXCEPT FOR STI)>Fuel Tank .

Are there damage or holes on the fuel tank?

Yes: Repair or replace the fuel tank. Ref. to FUEL INJECTION (FUEL SYSTEMS) (EXCEPT FOR STI)>Fuel Tank .

No: Go to 9.
CHECK ANY OTHER MECHANICAL TROUBLE IN EVAPORATIVE EMISSION CONTROL SYSTEM .
Check the condition of evaporative emission control system.

Are there holes, cracks, clogging, or disconnection, misconnection of hoses or pipes in evaporative emission control system?

Yes: Repair or replace the hoses or pipes.

No: Repair the poor contact of ECM connector.