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DTC P0497: EVAP System Low Purge Flow (2006 model)

Special Tools Required 

NOTE: Before you troubleshoot, record all freeze data and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ).
  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? 

    1. YES  -Go to step 2.
    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? 

    1. 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.
    2. 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? 

    1. YES  -Go to step 6.
    2. NO  -Reconnect or repair the EVAP canister purge line, then go to step  23.
  6. Disconnect the vacuum hose (A) from the purge line, and connect a T-fitting (B) from the vacuum gauge and the vacuum pump/gauge, 0-30 in.Hg, to the EVAP canister purge valve as shown.
    Fig 1: Connecting T-Fitting From Vacuum Gauge And Vacuum Pump/Gauge, 0-30 In.Hg, To EVAP Canister Purge Valve
    G03681161Courtesy of AMERICAN HONDA MOTOR CO., INC.
  7. Select 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? 

    1. YES  -Check for a blockage on the EVAP canister purge 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  24.
    2. NO  -Go to step 9.
  9. Reconnect the vacuum hose to the EVAP canister purge valve.
  10. Disconnect the vacuum hose from the EVAP canister purge line, 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 2: Connecting T-Fitting From Vacuum Gauge And Vacuum Pump/Gauge To Hose
    G03681162Courtesy 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.

    Does it hold vacuum? 

    1. YES  -Check for a restricted EVAP canister purge line between the EVAP canister purge valve and the EVAP canister, then go to step  23.
    2. 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 3: Connecting T-Fitting From Vacuum Pump/Gauge And Vacuum Pump To FTP Sensor
    G03681163Courtesy 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? 

    1. YES  -Go to step 18.
    2. NO  -Replace the FTP sensor (see FTP SENSOR REPLACEMENT ), then go to step  23.
  18. Reconnect the vacuum hose to the EVAP canister purge line (EVAP canister side), and reinstall the FTP sensor.
  19. Disconnect the vacuum hose (A) from the EVAP canister purge line (EVAP canister purge valve side), and connect a T-fitting (B) from the vacuum gauge and the vacuum pump/gauge, 0-30 in.Hg, to the hose as shown.
    Fig 4: Connecting T-Fitting From Vacuum Gauge And Vacuum Pump/Gauge To Hose
    G03681164Courtesy 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? 

    1. YES  -Check for blockage at the EVAP canister port, then go to step 22.
    2. NO  -Replace the EVAP canister vent shut valve, then go to step 22.
  22. Install the FTP sensor (see FTP SENSOR REPLACEMENT ).
  23. Reconnect all hoses.
  24. Turn the ignition switch ON (II).
  25. Reset the ECM with the HDS.
  26. Do the ECM idle learn procedure (see ECM IDLE LEARN PROCEDURE ).
  27. Do the EVAP FUNCTION TEST in the INSPECTION MENU with the HDS.

    Is the result OK? 

    1. YES  -Troubleshooting is complete.
    2. 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, then go to step  1.
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