Honda Civic. Manual — part 604

Courtesy of AMERICAN HONDA MOTOR CO., INC.

8. Apply about 2 kPa (0.6 in.Hg, 15 mmHg) of vacuum to the hose.
9. Select EVAP PCS ON in the INSPECTION MENU with the HDS.

Does the vacuum release momentary?

YES - Go to step 14.

NO - Go to step 10.

10. Select EVAP PCS OFF in the INSPECTION MENU with the HDS.
11. Disconnect the vacuum hose (A) from the EVAP canister purge valve (B).

Connect a T-fitting (C) from the vacuum gauge and the vacuum pump/gauge,
0-30 in.Hg, and the EVAP canister purge valve as shown.

Fig. 30: Connecting T-Fitting From Vacuum Gauge And Vacuum
Pump/Gauge And EVAP Canister Purge Valve
Courtesy of AMERICAN HONDA MOTOR CO., INC.

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

Does the vacuum release momentary?

2008 Honda Civic EX

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

YES - Check for blockage in the EVAP canister purge line between the EVAP
canister purge valve and the EVAP canister, then go to step 24.

NO - Replace the EVAP canister purge valve (see EVAP CANISTER VENT
SHUT VALVE REPLACEMENT ), then go to step 24.

14. Connect the vacuum pump/gauge, 0-30 in.Hg, to the vacuum hose (A) as

shown.

Fig. 31: Connecting Vacuum Pump/Gauge To Vacuum Hose
Courtesy of AMERICAN HONDA MOTOR CO., INC.

15. Start the engine, and let it idle.

Is there vacuum?

YES - Go to step 16.

NO - Check for blockage at the EVAP purge line between the throttle body
and the EVAP canister purge valve, then go to step 24.

16. Turn the ignition switch OFF.
17. Remove the FTP sensor with its connector connected (see FTP SENSOR

REPLACEMENT ).

18. 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.

2008 Honda Civic EX

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

Fig. 32: Identifying T-Fitting And FTP Sensor
Courtesy of AMERICAN HONDA MOTOR CO., INC.

19. Turn the ignition switch ON (II).
20. Check and record the FTP SENSOR reading in the DATA LIST with the HDS.
21. Slowly apply about 1.3 kPa (0.4 in.Hg, 10 mmHg) of vacuum to the hose.
22. Check the FTP SENSOR in the DATA LIST with the HDS.

Does the value change?

YES - Check for debris or blockage at the EVAP canister port, then go to step
24.

NO - Go to step 23.

23. Replace the FTP sensor (see FTP SENSOR REPLACEMENT ).
24. Reconnect all hoses.
25. Turn the ignition switch ON (II).
26. Reset the ECM with the HDS.
27. Do the ECM idle learn procedure (see ECM IDLE LEARN PROCEDURE ).
28. Do the EVAP FUNCTION TEST in the INSPECTION MENU with the HDS.

Is the result OK?

2008 Honda Civic EX

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

YES - Troubleshooting is complete.

NO - Check for poor connections or loose terminals at the FTP sensor and the
ECM, 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.

6. Turn the ignition switch OFF.
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

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)