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Home >> Acura >> 2009 >> RL >> Repair and Diagnosis >> Engine Mechanical >> Auxiliary Emission Control Systems >> EVAP System >> DTC Troubleshooting >> DTC P0497: EVAP System Low Purge Flow Detected >> Special Tools Required
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Special Tools Required

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review GENERAL TROUBLESHOOTING INFORMATION .
  1. Turn the ignition switch to ON (II).
  2. Clear the DTC with the HDS.
  3. Select EVAP FUNCTION TEST in the INSPECTION MENU with the HDS.

    Is the result OK? 

    YES  - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the EVAP canister purge valve, the FTP sensor, and the PCM.

    NO  - Go to step  4.

  4. Turn the ignition switch to LOCK (0).
  5. Check for poor connection, blockage, or damage at the EVAP canister purge line between the throttle body and the EVAP canister.

    Is the line OK? 

    YES  - Go to step  6.

    NO  - Reconnect or repair the EVAP canister purge line, then go to step  24.

  6. Disconnect the vacuum hose (A) from the EVAP canister purge valve (B).
    Fig 1: Identifying Vacuum Hose & EVAP Canister Purge Valve
    G06164243Courtesy of AMERICAN HONDA MOTOR CO., INC.
  7. Disconnect the vacuum hose (A) from the purge line (at the EVAP canister side), and connect the vacuum pump/gauge, 0-30 in.Hg, to the hose with a T-fitting (B) as shown below.
    Fig 2: Identifying Vacuum Hose & T-Fitting
    G06164244Courtesy of AMERICAN HONDA MOTOR CO., INC.
  8. Turn the ignition switch to ON (II).
  9. Apply about 2 kPa (0.6 in. Hg, 15 mmHg) of vacuum to the hose.
  10. Select EVAP PCS ON in the INSPECTION MENU with the HDS.

    Does the vacuum release immediately? 

    YES  - Go to step  15.

    NO  - Go to step  11.

  11. Select EVAP PCS OFF in the INSPECTION MENU with the HDS.
  12. Disconnect the vacuum hose (A) from the EVAP canister purge valve (B). Connect the T-fitting (C) from the vacuum gauge and the vacuum pump/gauge, 0-30 in.Hg, and EVAP canister purge valve as shown below.
    Fig 3: Identifying Vacuum Hose & T-Fitting
    G06164245Courtesy of AMERICAN HONDA MOTOR CO., INC.
  13. Apply about 2 kPa (0.6 in.Hg, 15 mmHg) of vacuum to the hose.
  14. Select EVAP PCS ON in the INSPECTION MENU with the HDS.

    Does the vacuum release immediately? 

    YES  - Check for a blockage in the vacuum hose 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 PURGE VALVE REPLACEMENT  ), then go to step  24.

  15. Connect the vacuum pump/gauge, 0-30 in.Hg, to the vacuum hose (A) as shown below.
    Fig 4: Identifying Vacuum Hose
    G06164246Courtesy of AMERICAN HONDA MOTOR CO., INC.
  16. Start the engine, and let it idle.

    Is there vacuum? 

    YES  - Go to step  17.

    NO  - Check for a blockage in the vacuum hose between the EVAP canister purge valve and the intake manifold, then go to step  24.

  17. Turn the ignition switch to LOCK (0).
  18. Remove the FTP sensor with its connector connected (see FTP SENSOR REPLACEMENT  ).
  19. Connect a T-fitting (A) from the vacuum pump/gauge, 0-30 in.Hg, and connect the vacuum pump to the FTP sensor (B) as shown below.
    Fig 5: Connecting T-Fitting From Vacuum Pump/Gauge
    G06164247Courtesy of AMERICAN HONDA MOTOR CO., INC.
  20. Turn the ignition switch to ON (II).
  21. Check and record the FTP SENSOR reading in the DATA LIST with the HDS.
  22. Slowly apply about 1.3 kPa (0.4 in.Hg, 10 mmHg) of vacuum to the hose.
  23. 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  - Replace the FTP sensor (see FTP SENSOR REPLACEMENT  ), then go to step  24.

  24. Turn the ignition switch to ON (II).
  25. Reset the PCM with the HDS.
  26. Do PCM IDLE LEARN PROCEDURE .
  27. Do the EVAP FUNCTION TEST in the INSPECTION MENU with the HDS.

    Is the result OK? 

    YES  - Go to step  28.

    NO  - Check for poor connections or loose terminals at the EVAP canister purge valve, the FTP sensor, and PCM, then go to step  1.

  28. Check for Temporary DTCs or DTCs with the HDS.

    Is DTC P0497 indicated? 

    YES  - Check for poor connections or loose terminals at the EVAP canister purge valve, the FTP sensor, and the PCM, then go to step  1.

    NO  - Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.

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