Honda Civic. Manual — part 618

Does it hold vacuum?

YES - Check for a restricted EVAP canister purge line between the EVAP
canister purge valve and the EVAP canister, then go to step 22.

NO - Go to step 13.

13. Remove the FTP sensor with its connector connected (see FTP SENSOR

REPLACEMENT ).

14. Connect a T-fitting (A) from the vacuum pump/gauge, 0-30 in.Hg, and the

vacuum pump to the FTP sensor (B) as shown.

Fig. 26: Connecting T-Fitting From Vacuum Pump/Gauge And Vacuum
Pump To FTP Sensor
Courtesy of AMERICAN HONDA MOTOR CO., INC.

15. Check and record the FTP SENSOR reading in the DATA LIST with the HDS.
16. Slowly apply about 1.3 kPa (0.4 in.Hg, 10 mmHg) of vacuum to the hose.
17. Check the FTP SENSOR in the DATA LIST with the HDS.

Is the difference more than 1.1 kPa (0.31 in.Hg, 8 mmHg) before and after
applying vacuum?

YES - Go to step 18.

NO - Replace the FTP sensor (see FTP SENSOR REPLACEMENT ), then

2008 Honda Civic EX

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

go to step 22.

18. Reconnect the vacuum hoses to the EVAP canister purge line (EVAP canister

side), and reinstall the FTP sensor.

19. Disconnect the vacuum hose (purge line) (A) from the EVAP canister purge

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

Fig. 27: Connecting T-Fitting From Vacuum Gauge And Vacuum
Pump/Gauge To Hose
Courtesy of AMERICAN HONDA MOTOR CO., INC.

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

Does the hose hold vacuum?

YES - Check for a blockage at the EVAP canister port, then go to step 22.

NO - Replace the EVAP canister vent shut valve (see EVAP CANISTER
VENT SHUT VALVE REPLACEMENT ), then go to step 22.

22. Reconnect all hoses.
23. Turn the ignition switch ON (II).
24. Reset the ECM/PCM with the HDS.

2008 Honda Civic EX

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

25. Do the ECM/PCM idle learn procedure (see ECM/PCM IDLE LEARN

PROCEDURE ).

26. 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 P0498: EVAP CANISTER VENT SHUT VALVE CIRCUIT LOW VOLTAGE

1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0498 indicated?

YES - Go to step 6.

NO - Go to step 4.

4. Select EVAP CVS ON in the INSPECTION MENU with the HDS.
5. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0498 indicated?

YES - Go to step 6.

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.

6. Turn the ignition switch OFF.

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)

7. Disconnect the EVAP canister vent shut valve 2P connector.
8. Turn the ignition switch ON (II).
9. Measure voltage between EVAP canister vent shut valve 2P connector terminal

No. 2 and body ground.

Fig. 28: Measuring Voltage Between EVAP Canister Vent Shut Valve 2P
Terminal No. 2 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage?

YES - Go to step 10.

NO - Repair open in the wire between the EVAP canister vent shut valve and
the PGM-FI subrelay (E), then go to step 18.

10. Turn the ignition switch OFF.
11. At the valve side, measure resistance between EVAP canister vent shut valve

2P connector terminals No. 1 and No. 2.

2008 Honda Civic EX

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