Honda Civic. Manual — part 620

NO - Intermittent failure, the system is OK at this time. Check for poor
connections or loose terminals at the EVAP canister vent shut valve and the
ECM/PCM.

5. Update the ECM/PCM if it does not have the latest software (see UPDATING

ECM/PCM ), or substitute a known-good ECM/PCM (see SUBSTITUTING
THE ECM/PCM ).

6. Select EVAP CVS ON in the INSPECTION MENU with the HDS.
7. Check for Temporary DTCs or DTCs with the HDS.

Is DTC P0499 indicated?

YES - Check for poor connections or loose terminals at the EVAP canister
vent shut valve and the ECM/PCM. If the ECM/PCM was updated, substitute a
known-good ECM/PCM (see SUBSTITUTING THE ECM/PCM ), then go
to step 6. If the ECM/PCM was substituted, go to step 1.

NO - Go to step 8.

8. Monitor the OBD STATUS for DTC P0499 in the DTCs MENU with the

HDS.

Does the screen indicate PASSED?

YES - If the ECM/PCM was updated, troubleshooting is complete. If the
ECM/PCM was substituted, replace the original ECM/PCM (see ECM/PCM
REPLACEMENT ). If any other Temporary DTCs or DTCs were indicated in
step 7, go to the indicated DTCs troubleshooting.

NO - If the screen indicates FAILED, check for poor connections or loose
terminals at the EVAP canister vent shut valve and the ECM/PCM. If the
ECM/PCM was updated, substitute a known-good ECM/PCM (see
SUBSTITUTING THE ECM/PCM ), then go to step 6. If the ECM/PCM
was substituted, go to step 1. If the screen indicates NOT COMPLETED, go to
step 6.

DTC P1454: FTP SENSOR RANGE/PERFORMANCE PROBLEM; DTC P2422: EVAP CANISTER

2008 Honda Civic EX

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

VENT SHUT VALVE STUCK CLOSED MALFUNCTION

1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch OFF.
4. Remove the fuel fill cap, and wait 1 minute.
5. Check the FTP SENSOR in the DATA LIST with the HDS.

Is it between - 0.67 and 0.67 kPa (- 0.2 and 0.2 in.Hg, -5 and 5 mmHg), or 2.4
and 2.6 V?

YES - Go to step 6.

NO - Go to step 17.

6. Install the fuel fill cap.
7. Clear the DTC with the HDS.
8. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park on

neutral) until the radiator fan comes on, then let it idle.

9. Monitor the OBD STATUS for DTC P1454 in the DTCs MENU with the

HDS.

Does the screen indicate FAILED?

YES - Go to step 10.

NO - If the screen indicates PASSED, 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 ECM/PCM. Also check for a blockage
in the vent hoses and the drain joint. If the screen indicates NOT
COMPLETED, keep idling until a result comes on.

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)

10. Clear the DTC with the HDS.
11. Turn the ignition switch OFF.
12. Remove the EVAP canister vent shut valve from the EVAP canister (see

EVAP CANISTER VENT SHUT VALVE REPLACEMENT ).

13. Connect the 2P connector to the EVAP canister vent shut valve.
14. Turn the ignition switch ON (II).
15. Select EVAP CVS ON in the INSPECTION MENU with the HDS.
16. Check the EVAP canister vent shut valve (A) operation.

Fig. 33: Checking EVAP Canister Vent Shut Valve Operation
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Does the valve operate?

YES - Check for a blockage in the EVAP canister, vent hoses, and drain joint,
then install the EVAP canister vent shut valve, and go to step 23.

NO - Replace the EVAP canister vent shut valve (see EVAP CANISTER
VENT SHUT VALVE REPLACEMENT ), then go to step 23.

17. Disconnect the air tube (A) from the FTP sensor (B).

2008 Honda Civic EX

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

Fig. 34: Disconnecting Air Tube From FTP Sensor
Courtesy of AMERICAN HONDA MOTOR CO., INC.

18. Check the FTP SENSOR in the DATA LIST with the HDS.

Is it between - 0.67 and 0.67 kPa (- 0.2 and 0.2 in.Hg, -5 and 5 mmHg), or 2.4
and 2.6 V?

YES - Check for a blockage in the FTP sensor air tube or vent, then go to step
23.

NO - Go to step 19.

19. Turn the ignition switch OFF.
20. Remove the FTP sensor (A) from the EVAP canister with its connector

connected (see FTP SENSOR REPLACEMENT ).

Fig. 35: Removing FTP Sensor From EVAP Canister With Connector
Connected

2008 Honda Civic EX

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