Honda Civic. Manual — part 606

good ECM (see SUBSTITUTING THE ECM ), then go to step 27. If the
ECM was substituted, go to step 1.

NO - Go to step 29.

29. Monitor the OBD STATUS for DTC P0498 in the DTCs MENU with the

HDS.

Does the screen indicate PASSED?

YES - If the ECM was updated, troubleshooting is complete. If the ECM was
substituted, replace the original ECM (see ECM REPLACEMENT ). If any
other Temporary DTCs or DTCs were indicated in step 28, go to the indicated
DTC's troubleshooting.

NO - If the screen indicates FAILED, check for poor connections or loose
terminals at the EVAP canister vent shut valve and the ECM. If the ECM was
updated, substitute a known-good ECM (see SUBSTITUTING THE ECM ),
then go to step 27. If the ECM was substituted, go to step 1. If the screen
indicates NOT COMPLETED, go to step 27.

DTC P0499: EVAP CANISTER VENT SHUT VALVE CIRCUIT HIGH VOLTAGE

1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Select EVAP CVS ON in the INSPECTION MENU with the HDS.
4. Check for Temporary DTCs or DTCs with the HDS.

Is DTC P0499 indicated?

YES - Go to step 5.

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 (K20Z3) - Civic (Except GX & Si)

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.

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

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

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. If the ECM was updated, substitute a known-
good ECM (see SUBSTITUTING THE ECM ), then go to step 6. If the ECM
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 was updated, troubleshooting is complete. If the ECM was
substituted, replace the original ECM (see ECM REPLACEMENT ). If any
other Temporary DTCs or DTCs were indicated in step 7, go to the indicated
DTC's troubleshooting.

NO - If the screen indicates FAILED, check for poor connections or loose
terminals at the EVAP canister vent shut valve and the ECM. If the ECM was
updated, substitute a known-good ECM (see SUBSTITUTING THE ECM ),
then go to step 6. If the ECM 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
VENT SHUT VALVE STUCK CLOSED MALFUNCTION

2008 Honda Civic EX

2006-08 ENGINE PERFORMANCE EVAP System (K20Z3) - Civic (Except GX & Si)

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 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. 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.

10. Clear the DTC with the HDS.

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 (K20Z3) - Civic (Except GX & Si)

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. 38: 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 (K20Z3) - Civic (Except GX & Si)