Code P0497 and check engine light on

Hi,

This code can be the result of several things. It could be a plugged evap hose, broken or damaged hose, bad fuel cap, and so on.

I am going to provide you the directions for diagnosing what is causing the problem. The attached pics correlate with the directions.

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2005 Honda Accord L4-2.4L
P0497
Vehicle ALL Diagnostic Trouble Codes ( DTC ) Testing and Inspection P Code Charts P0497
P0497
DTC P0497: EVAP System Low Purge Flow

Special Tools Required
Vacuum/pressure gauge, 0 - 4 in. Hg 07JAZ-0010000B

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

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 24.

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 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 line, then go to step 24.

Pic 1

6. Disconnect the vacuum hose (A) from the EVAP canister purge valve (B), in the engine compartment, and connect a commercially available vacuum pump/gauge, 0-30 in. Hg (Snap-on YA4000A or equivalent) to the EVAP canister purge valve.
7. Do the EVAP PCS ON in the INSPECTION MENU with the HDS.
8. Slowly apply about 2 kPa (0.6 in. Hg, 15 mmHg) of vacuum to the hose.

Does it hold vacuum?

YES - Check for blockage in the PCS 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 23.

NO - Go to step 9.

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

Pic 2

10. Disconnect the vacuum hose from the PCS line (EVAP canister side), and connect a commercially available vacuum pump/gauge, 0 - 30 in. Hg (Snap-on YA4000A or equivalent) to the hose.
11. Do the 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.

Does it hold vacuum?

YES - Check for a restricted in the PCS line between the EVAP canister purge valve and the EVAP canister, then go to step 23.

NO - Go to step 13.

13. Remove the FTP sensor with its connector connected.

Pic 3

14. Connect a T-fitting (A) from the vacuum gauge and the commercially available vacuum pump/gauge, 0 - 30 in. Hg (Snap-on YA4000A or equivalent) to the FTP sensor (B) as shown.
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, then go to step 23.

18. Reconnect the vacuum hose to the PCS line (EVAP canister side) and reinstall the FTP sensor.

Pic 4

19. Disconnect the vacuum hose (A) from the EVAP canister purge valve (B), and connect a commercially available vacuum pump/gauge, 0 - 30 in. Hg (Snap-on YA4000A or equivalent) to the hose.
20. Do the 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 blockage at the EVAP canister port, then go to step 22.

NO - Replace the EVAP canister vent shut valve, then go to step 22.

22. Install the FTP sensor.
23. Reconnect all hoses.
24. Turn the ignition switch ON (II).
25. Reset the ECM/PCM with the HDS.
26. Do the ECM/PCM idle learn procedure. See: Engine Control Module > Programming and Relearning
27. 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.

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Let me know if that helps or if you have other questions.

Take care,
Joe