Honda Civic. Manual — part 617

18. Reinstall the EVAP canister vent shut valve.
19. Turn the ignition switch ON (II).
20. Reset the ECM/PCM with the HDS.
21. Do the ECM/PCM idle learn procedure (see ECM/PCM IDLE LEARN

PROCEDURE ).

22. 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.

DTC P0496: EVAP SYSTEM HIGH PURGE FLOW DETECTED

1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. 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 purge
valve, the EVAP canister vent shut valve, and the ECM/PCM.

NO - Go to step 4.

4. Turn the ignition switch OFF.
5. Replace the EVAP canister purge valve (see EVAP CANISTER PURGE

VALVE REPLACEMENT ).

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)

6. Turn the ignition switch ON (II).
7. Reset the ECM/PCM with the HDS.
8. Do the ECM/PCM idle learn procedure (see ECM/PCM IDLE LEARN

PROCEDURE ).

9. 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 P0497: EVAP SYSTEM LOW PURGE FLOW DETECTED

Special Tools Required

Vacuum/pressure gauge, 0-4 in.Hg, 07JAZ-001000B

Vacuum pump/gauge, 0-30 in.Hg, Snap-on YA4000A or equivalent,
commercially available

1. Check the fuel fill cap installation. (The cap must say "TIGHTEN TO CLICK."

The cap should tighten 1/4 turn after it is tight.)

Is the fuel fill cap installed and properly tightened?

YES - Go to step 2.

NO - Properly install the fuel fill cap, then go to step 23.

2. Turn the ignition switch ON (II).

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)

3. Clear the DTC with the HDS.
4. 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 purge
valve, or the EVAP canister vent shut valve and the ECM/PCM.

NO - Go to step 5.

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

manifold and the EVAP canister purge valve.

Is the line OK?

YES - Go to step 6.

NO - Reconnect or repair the EVAP canister purge line, then go to step 23.

6. Disconnect the vacuum hose (A) from the EVAP canister purge valve (B) in

the engine compartment, and connect a T-fitting (C) from the vacuum gauge
and the vacuum pump/gauge, 0-30 in.Hg, to the vacuum hose (A) as shown.

Fig. 24: Connecting T-Fitting From Vacuum Gauge And Vacuum
Pump/Gauge, To Vacuum Hose

2008 Honda Civic EX

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

Courtesy of AMERICAN HONDA MOTOR CO., INC.

7. Select EVAP PCS ON in the INSPECTION MENU with the HDS.
8. Slowly apply about 0.6 in.Hg (15 mmHg) of vacuum to the hose.

Does it hold vacuum?

YES - Replace the EVAP canister purge valve, then go to step 22.

NO - Go to step 9.

9. Reconnect the vacuum hose to the EVAP canister purge valve.

10. Disconnect the vacuum hose from the purge line (at the EVAP canister side),

and connect a T-fitting (A) from the vacuum gauge and the vacuum
pump/gauge, 0-30 in.Hg, to the hose as shown.

Fig. 25: Connecting T-Fitting From Vacuum Gauge And Vacuum Pump/
Gauge To Hose
Courtesy of AMERICAN HONDA MOTOR CO., INC.

11. Select EVAP PCS ON in the INSPECTION MENU with the HDS.
12. Slowly apply about 2 kPa (0.6 in.Hg, 15 mmHg) of vacuum to the hose.

2008 Honda Civic EX

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