Acura TSX / Honda Accord CL. Manual — part 546

11. Check the EVAP canister vent shut valve (A) operation.

Does the valve operate?

YES: Check the routing of the EVAP canister vent tube, then go to step 18 .

NO: Go to step 12.

Fig. 22: Checking The EVAP Canister Vent Shut Valve Operation

12. Turn the ignition switch OFF.

13. Replace the EVAP canister vent shut valve (see EVAP CANISTER VENT SHUT VALVE

REPLACEMENT ).

14. Turn the ignition switch ON (II).

15. Reset the ECM/PCM with the HDS.

16. Do the ECM/PCM idle learn procedure (see ECM/PCM IDLE LEARN PROCEDURE ).

17. 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 or the EVAP canister

2004 Acura TSX

2004 ENGINE PERFORMANCE EVAP System - TSX

vent shut valve and the ECM/PCM, then go to step 16.

18. Reinstall the EVAP canister vent shut valve (see EVAP CANISTER VENT SHUT VALVE

REPLACEMENT ).

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 or the EVAP canister
vent shut valve and the ECM/PCM, then go to step 21.

DTC P0496: EVAP SYSTEM HIGH PURGE FLOW

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, 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 4.

4. Turn the ignition switch OFF.

5. Replace the EVAP canister purge valve (see EVAP CANISTER PURGE VALVE REPLACEMENT ).

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, or the EVAP canister vent shut valve and the ECM/PCM, then go to step 1 .

DTC P0497: EVAP SYSTEM LOW PURGE FLOW

Special Tools Required:

z

Vacuum pump/Gauge, 0-30 in. Hg A973X-041-XXXXX

z

Vacuum/Pressure Gauge, 0-4 in. Hg 07 JAZ-001000B

1. Check the fuel fill cap (the cap must say "If not tightened 3 clicks check engine light may come on").

2004 Acura TSX

2004 ENGINE PERFORMANCE EVAP System - TSX

Is the correct fuel fill cap installed and properly tightened?

YES: Go to step 2.

NO: Replace or tighten the cap, then go to step 22 .

2. Turn the ignition switch ON (II).

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, 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 PCS/CPV 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 PCS/CPV line, then go to step 22 .

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

connect a vacuum pump to the EVAP canister purge valve.

2004 Acura TSX

2004 ENGINE PERFORMANCE EVAP System - TSX

Fig. 23: Disconnecting The Vacuum Hose From The EVAP Canister Purge Valve

7. Do the EVAP PCS/CPV ON in the INSPECTION MENU with the HDS.

8. Slowly apply about 0.6 in. Hg (15 mm Hg) of vacuum the hose.

Does it hold vacuum?

YES: Check for blockage on the PCS/CPV line between the intake manifold and the EVAP
canister purge valve. If the vacuum hose is OK, 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 PCS/CPV line (EVAP canister side), and connect a vacuum pump

to the hose.

Fig. 24: Disconnecting The Vacuum Hose From The PCS/CPV Line

11. Do the EVAP PCS/CPV ON in the INSPECTION MENU with the HDS.

12. Slowly apply about 0.6 in. Hg (15 mm Hg) of vacuum to the hose.

Does it hold vacuum?

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

2004 Acura TSX

2004 ENGINE PERFORMANCE EVAP System - TSX