Honda Civic. Manual — part 616

15.1 mmHg).

17. Monitor the FTP SENSOR in the DATA LIST for 1 minute with the HDS.

Does the voltage increase more than 0.2 V (0.1 in.Hg, 2.5 mmHg)?

YES - Go to step 18.

NO - Replace the EVAP canister vent shut valve (see EVAP CANISTER
VENT SHUT VALVE REPLACEMENT ), then go to step 21.

18. Check for a loose or damaged EVAP canister purge line between the EVAP

canister and the EVAP canister purge valve.

Is the line OK?

YES - Replace these parts, then go to step 21:

FTP sensor O-ring

EVAP canister vent shut valve case and O-ring

EVAP canister

NO - Reconnect or repair the EVAP canister purge hose, then go to step 21.

19. Select EVAP CVS OFF in the INSPECTION MENU with the HDS.
20. Check these parts for looseness or damage:

Fuel fill pipe

Fuel vapor return pipe

Are the parts OK?

YES - Check the fuel tank unit base gasket (see FUEL TANK
REPLACEMENT ), and check the fuel tank, then go to step 21.

NOTE:

Be careful not to exceed the pressure. If you exceed the
pressure, the FTP sensor can be damaged.

2008 Honda Civic EX

2006-08 ENGINE PERFORMANCE EVAP System (R18A1) - Civic (All Except Hybrid)

NO - Repair or replace the damaged parts, then go to step 21.

21. Reconnect all hoses and connectors.
22. Turn the ignition switch ON (II).
23. Reset the ECM/PCM with the HDS.
24. Do the ECM/PCM idle learn procedure (see ECM/PCM IDLE LEARN

PROCEDURE ).

25. 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 purge valve, the EVAP canister vent shut valve, and the
ECM/PCM, then go to step 1.

DTC P0457: EVAP SYSTEM LEAK DETECTED/FUEL FILL CAP LOOSE OR MISSING

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 19.

2. Check the fuel fill cap seal (A) and the fuel fill pipe mating surface (B). Verify

that the fuel fill cap tether cord (C) is not caught under the cap.

NOTE:

Before you troubleshoot, record all freeze data and any on-
board snapshot, and review the general troubleshooting
information (see GENERAL TROUBLESHOOTING
INFORMATION ).

2008 Honda Civic EX

2006-08 ENGINE PERFORMANCE EVAP System (R18A1) - Civic (All Except Hybrid)

Fig. 22: Checking Fuel Fill Cap Seal And Fuel Fill Pipe Mating Surface
Courtesy of AMERICAN HONDA MOTOR CO., INC.

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 19.

NO - Go to step 3.

3. Turn the ignition switch ON (II).
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, or the EVAP canister vent
shut valve and the ECM/PCM.

NO - Go to step 6.

6. Turn the ignition switch OFF.
7. Remove the EVAP canister vent shut valve from the EVAP canister (see

EVAP CANISTER VENT SHUT VALVE REPLACEMENT ).

8. Connect the 2P connector to the EVAP canister vent shut valve.
9. Turn the ignition switch ON (II).

2008 Honda Civic EX

2006-08 ENGINE PERFORMANCE EVAP System (R18A1) - Civic (All Except Hybrid)

10. Select EVAP CVS ON in the INSPECTION MENU with the HDS.
11. Check the EVAP canister vent shut valve (A) operation.

Fig. 23: Checking EVAP Canister Vent Shut Valve Operation
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Does the valve operate?

YES - Check the routing of the EVAP canister vent tube, then go to step 18.

NO - Go to step 12.

12. Turn the ignition switch OFF.
13. Replace the EVAP canister vent shut valve (see EVAP CANISTER VENT

SHUT VALVE REPLACEMENT ).

14. Turn the ignition switch ON (II).
15. Reset the ECM/PCM with the HDS.
16. Do the ECM/PCM idle learn procedure (see ECM/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 ECM/PCM, then go to step 1.

2008 Honda Civic EX

2006-08 ENGINE PERFORMANCE EVAP System (R18A1) - Civic (All Except Hybrid)