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DTC P0497: EVAP System Low Purge Flow (2004-2005 models)

Special Tools Required 

Vacuum pump/gauge, 0-30 in.Hg, Snap-on YA4000A or equivalent, commercially available

NOTE: Before you troubleshoot, record all freeze data and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ).
  1. Turn the ignition switch ON (II).
  2. Measure voltage between ECM connector terminal A6 and body ground.
    Fig 1: Measuring Voltage Between ECM Connector Terminal A6 And Body Ground
    G03692827Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    1. YES -  Go to step 3.
    2. NO -  Go to step  8.
  3. Turn the ignition switch OFF.
  4. Disconnect the vacuum hose from the EVAP purge joint (A), and connect a commercially available vacuum pump/gauge, 0-30 in.Hg, to the hose.
    Fig 2: Disconnecting Vacuum Hose From EVAP Purge Joint
    G03692828Courtesy of AMERICAN HONDA MOTOR CO., INC.
  5. Connect ECM connector terminal A6 to body ground with a jumper wire.
    Fig 3: Connecting ECM Connector Terminal A6 To Body Ground With A Jumper Wire
    G03692829Courtesy of AMERICAN HONDA MOTOR CO., INC.
  6. Turn the ignition switch ON (II).
  7. Apply vacuum to the hose.

    Does the valve hold vacuum? 

    1. YES -  Replace the EVAP canister purge valve.
    2. NO -  Go to step  14.
  8. Turn the ignition switch OFF.
  9. Disconnect the EVAP canister purge valve 2P connector.
  10. Check for continuity between EVAP canister purge valve 2P connector terminal No. 2 and body ground.
    Fig 4: Checking For Continuity Between EVAP Canister Purge Valve 2P Connector Terminal No. 2 And Body Ground
    G03692830Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES -  Go to step 11.
    2. NO -  Repair open in the wire between the EVAP canister purge valve and the ECM (A6).
  11. Turn the ignition switch ON (II).
  12. Measure voltage between EVAP canister purge valve 2P connector terminal No. 1 and body ground.
    Fig 5: Measuring Voltage Between EVAP Canister Purge Valve 2P Connector Terminal No. 1 And Body Ground
    G03692831Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    1. YES -  Go to step 13.
    2. NO -  Repair open in the wire between the EVAP canister purge valve and the No. 6 ACG (15 A) fuse in the under-dash fuse/relay box.
  13. Measure resistance between EVAP canister purge valve 2P connector terminals No. 1 and No. 2.
    Fig 6: Measuring Resistance Between EVAP Canister Purge Valve 2P Connector Terminals No. 1 And No. 2
    G03692832Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there about 33 Ω at room temperature? 

    1. YES -  Go to step 14.
    2. NO -  Replace the EVAP canister purge valve.
  14. Measure voltage between ECM connector terminal A4 and body ground.
    Fig 7: Measuring Voltage Between ECM Connector Terminal A4 And Body Ground
    G03692833Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    1. YES -  Go to step 15.
    2. NO -  Go to step  20.
  15. Turn the ignition switch OFF.
  16. Disconnect the vacuum hose from the EVAP canister vent filter line (A), and connect a commercially available vacuum pump/gauge, 0-30 in.Hg, to the hose.
    Fig 8: Disconnecting Vacuum Hose From EVAP Canister Vent Filter Line
    G03692834Courtesy of AMERICAN HONDA MOTOR CO., INC.
  17. Connect ECM connector terminal A4 to body ground with a jumper wire.
    Fig 9: Connecting ECM Connector Terminal A4 To Body Ground With A Jumper Wire
    G03692835Courtesy of AMERICAN HONDA MOTOR CO., INC.
  18. Turn the ignition switch ON (II).
  19. Apply vacuum to the hose.

    Does the valve hold vacuum? 

    1. YES -  Inspect the vacuum line between the EVAP canister purge valve and the EVAP canister.
    2. NO -  Replace the EVAP canister vent shut valve.
  20. Turn the ignition switch OFF.
  21. Disconnect the EVAP canister vent shut valve 2P connector.
  22. Check for continuity between EVAP canister vent shut valve 2P connector terminal No. 2 and body ground.
    Fig 10: Checking For Continuity Between EVAP Canister Vent Shut Valve 2P Connector Terminal No. 2 And Body Ground
    G03692836Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES -  Go to step 23.
    2. NO -  Repair open in the wire between the EVAP canister vent shut valve and the ECM.
  23. Turn the ignition switch ON (II).
  24. Measure voltage between EVAP canister vent shut valve 2P connector terminal No. 1 and body ground.
    Fig 11: Measuring Voltage Between EVAP Canister Vent Shut Valve 2P Connector Terminal No. 1 And Body Ground
    G03692837Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    1. YES -  Go to step 25.
    2. NO -  Repair open in the wire between the EVAP canister vent shut valve and the No. 6 ACG (15 A) fuse in the under-dash fuse/relay box.
  25. Measure resistance between EVAP canister vent shut valve 2P connector terminals No. 1 and No. 2.
    Fig 12: Measuring Resistance Between EVAP Canister Vent Shut Valve 2P Connector Terminals No. 1 And No. 2
    G03692838Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there about 33 ° at room temperature? 

    1. YES -  Substitute a known-good ECM (see HOW TO SUBSTITUTE THE ECM FOR TESTING PURPOSES ) and retest. If the symptom/indication goes away, replace the original ECM (see ECM REPLACEMENT ).
    2. NO -  Replace the EVAP canister vent shut valve.
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