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Home >> Acura >> 2003 >> MDX Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 94 (EVAP System) >> DTC Troubleshooting >> DTC P0497: EVAP System Low Purge Flow

DTC P0497: EVAP System Low Purge Flow

WARNING: This page is about a different car, the 2009 Acura MDX, 2008 Acura MDX, and 2007 Acura MDX. However, it is still accessible from the selected car via links, so may be relevant.

Special Tools Required 

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ).
  1. Check the fuel fill cap installation (The cap label must say "Tighten to click.". The cap should tighten 1/4 turn after it is tight.).

    Is the fuel fill cap installed and properly tightened? 

    YES  - Go to step 2.

    NO  - Properly install the fuel fill cap, then go to step  28.

  2. Turn the ignition switch ON (II).
  3. Clear the DTC with the HDS.
  4. 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 FTP sensor, the EVAP canister purge valve, the EVAP canister vent shut valve, and the PCM.

    NO  - Go to step 5.

  5. Check for poor connection, blockage, or damage at the EVAP canister purge line between the intake manifold 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  28.

  6. Disconnect the vacuum hose (A) from the EVAP canister purge valve (B).
    Fig 1: Identifying Vacuum Hose From EVAP Canister Purge Valve
    G05485365Courtesy of AMERICAN HONDA MOTOR CO., INC.
  7. Disconnect the vacuum hose (A) from the purge line (at the EVAP canister 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 2: Identifying T-Fitting From Vacuum Gauge
    G05485366Courtesy of AMERICAN HONDA MOTOR CO., INC.
  8. Select EVAP PCS ON in the INSPECTION MENU with the HDS.
  9. Slowly apply about 2 kPa (0.6 in.Hg, 15 mmHg) of vacuum to the hose.

    Does it hold vacuum? 

    YES  - Go to step 10.

    NO  - Go to step  15.

  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, to the hose (D) as shown.
    Fig 3: Identifying T-Fitting From Vacuum Gauge
    G05485367Courtesy of AMERICAN HONDA MOTOR CO., INC.
  12. Turn the ignition switch ON (II).
  13. Select EVAP PCS ON in the INSPECTION MENU with the HDS.
  14. Slowly apply about 2 kPa (0.6 in.Hg, 15 mmHg) of vacuum to the hose.

    Does it hold vacuum? 

    YES  - Replace the EVAP canister purge valve (see EVAP CANISTER PURGE VALVE REPLACEMENT  ), then go to step  28.

    NO  - Check for blockage in the vacuum hose between the EVAP canister purge valve and the EVAP canister, then go to step  28.

  15. Connect the vacuum pump/gauge, 0-30 in.Hg, to the vacuum hose (A) as shown.
    Fig 4: Identifying Vacuum Pump/Gauge To Vacuum Hose
    G05485368Courtesy 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 blockage in the vacuum hose between the EVAP canister purge valve and the intake manifold, then go to step  28.

  17. Turn the ignition switch OFF.
  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 the vacuum pump to the FTP sensor (B) as shown.
    Fig 5: Identifying T-Fitting From Vacuum Pump/Gauge
    G05485369Courtesy of AMERICAN HONDA MOTOR CO., INC.
  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.
    NOTE: Be careful not to exceed the vacuum. If you do, the FTP sensor can be damaged.
  22. 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 23.

    NO  - Replace the FTP sensor (see FTP SENSOR REPLACEMENT  ), then go to step  27.

  23. Reconnect the vacuum hoses to the EVAP canister purge line (EVAP canister side), and reinstall the FTP sensor.
  24. Disconnect the vacuum hose (purge line) (A) from the EVAP canister purge valve (B) in the engine compartment, and connect a T-fitting (C) from the vacuum gauge and the vacuum pump/gauge, 0-30 in.Hg, to the vacuum hose (A) as shown.
    Fig 6: Identifying T-Fitting From Vacuum Gauge
    G05485370Courtesy of AMERICAN HONDA MOTOR CO., INC.
  25. Select EVAP CVS ON in the INSPECTION MENU with the HDS.
  26. 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 27.

    NO  - Replace the EVAP canister vent shut valve (see EVAP CANISTER VENT SHUT VALVE REPLACEMENT  ), then go to step 27.

  27. Reconnect all hoses.
  28. Turn the ignition switch ON (II).
  29. Reset the PCM with the HDS.
  30. Do the PCM idle learn procedure (see PCM IDLE LEARN PROCEDURE ).
  31. 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, the EVAP canister vent shut valve, and the PCM, then go to step  1.

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