DTC Troubleshooting

DTC Troubleshooting: P0457

DTC P0457:

EVAP System Leak Detected/Fuel Fill Cap Loose or Missing

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information Initial Inspection and Diagnostic Overview.

1. Check the fuel fill cap (the cap must say "TIGHTEN TO CLICK"). It should turn 1/4 turn after it's tight, then it clicks.

Is the correct fuel fill cap installed and properly tightened?

YES -

Go to step 2.

NO -

Replace or tighten the cap, then go to step 20.

2. Check the fuel fill cap seal (A) and the fuel fill pipe mating surface (B). Make sure that the fuel fill cap tether cord (C) is not caught under the cap.





Is the fuel fill cap seal missing or damaged, is the fuel fill pipe damaged, or is the tether cord caught under the cap?

YES -

Replace the fuel fill cap or the fuel fill pipe, then go to step 20.

NO -

Go to step 3.

3. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.

4. Clear the DTC with the HDS.

5. Do the EVAP FUNCTION TEST in the INSPECTION MENU with the HDS.

Is the result OK?

YES -

Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the FTP sensor, the EVAP canister vent shut valve, and the PCM.�

NO -

Go to step 6.

6. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.

7. Remove the EVAP canister vent shut valve from the EVAP canister Service and Repair.

8. Connect the 2P connector to the EVAP canister vent shut valve.

9. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.

10. Select EVAP CVS ON in the INSPECTION MENU with the HDS.

11. Check the EVAP canister vent shut valve (A) operation.





Does the valve operate?

YES -

Go to step 18.

NO -

Go to step 12.

12. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.

13. Replace the EVAP canister vent shut valve Service and Repair.

14. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.

15. Reset the PCM with the HDS.

16. Do the PCM idle learn procedure PCM Idle Learn Procedure.

17. Do the EVAP FUNCTION TEST in the INSPECTION MENU with the HDS.

Is the result OK?

YES -

Troubleshooting is complete.�

NO -

Check for poor connections or loose terminals at the FTP sensor, the EVAP canister vent shut valve, and the PCM. Also check all EVAP line connections, then go to step 1.

18. Check the EVAP canister vent tube.

Is there any damage or blockage?

YES -

Remove the blockage or replace the EVAP canister vent tube if needed, then go to step 19.

NO -

Do the DTC P0455 troubleshooting P0455.�

19. Reinstall the EVAP canister vent shut valve.

20. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.

21. Reset the PCM with the HDS.

22. Do the PCM idle learn procedure PCM Idle Learn Procedure.

23. Do the EVAP FUNCTION TEST in the INSPECTION MENU with the HDS.

Is the result OK?

YES -

Troubleshooting is complete.�

NO -

Check for poor connections or loose terminals at the FTP sensor, the EVAP canister vent shut valve, and the PCM. Also check all EVAP line connections, then go to step 1.