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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
    G03681147Courtesy 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 (A) from the EVAP canister purge line (B) and connect a vacuum pump/gauge, 0-30 in.Hg, to the hose.
    Fig 2: Disconnecting Vacuum Hose From EVAP Canister Purge Line
    G03681148Courtesy 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 Jumper Wire
    G03681149Courtesy 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  16.
  8. Turn the ignition switch OFF.
  9. Disconnect ECM connector A (32P).
  10. Connect ECM connector terminal A6 to body ground with a jumper wire.
    Fig 4: Connecting ECM Connector Terminal A6 To Body Ground With Jumper Wire
    G03681150Courtesy of AMERICAN HONDA MOTOR CO., INC.
  11. Disconnect the EVAP canister purge valve 2P connector.
  12. Check for continuity between EVAP canister purge valve 2P connector terminal No. 2 and body ground.
    Fig 5: Checking For Continuity Between EVAP Canister Purge Valve 2P Connector Terminal No. 2 And Body Ground
    G03681151Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES  -Go to step 13.
    2. NO  -Repair open in the wire between the EVAP canister purge valve and the ECM (A6).
  13. Turn the ignition switch ON (II).
  14. Measure voltage between EVAP canister purge valve 2P connector terminal No. 1 and body ground.
    Fig 6: Measuring Voltage Between EVAP Canister Purge Valve 2P Connector Terminal No. 1 And Body Ground
    G03681152Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    1. YES  -Go to step 15.
    2. NO  -Repair open in the wire between the EVAP canister purge valve and the No. 4 (7.5 A) fuse in the under-dash fuse/relay box.
  15. At the sensor side, measure resistance between EVAP canister purge valve 2P connector terminals No. 1 and No. 2.
    Fig 7: Measuring Resistance Between EVAP Canister Purge Valve 2P Connector Terminals No. 1 And No. 2
    G03681153Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there about 33 Ω at room temperature? 

    1. YES  -Update the ECM if it does not have the latest software, or substitute a known-good ECM (see ECM UPDATING AND SUBSTITUTION FOR TESTING-2006 M/T MODELS AND CVT MODEL ), then recheck. If the symptom/indication goes away with a known-good ECM, replace the original ECM (see ECM REPLACEMENT ).
    2. NO  -Replace the EVAP canister purge valve.
  16. Measure voltage between ECM connector terminal A4 and body ground.
    Fig 8: Measuring Voltage Between ECM Connector Terminal A4 And Body Ground
    G03681154Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    1. YES  -Go to step 17.
    2. NO  -Go to step  22.
  17. Turn the ignition switch OFF.
  18. Disconnect the vacuum hose from the EVAP canister vent filter line (A), and connect a vacuum pump/gauge, 0-30 in.Hg, to the hose.
    Fig 9: Connecting Vacuum Pump/Gauge To Hose
    G03681155Courtesy of AMERICAN HONDA MOTOR CO., INC.
  19. Connect ECM connector terminal A4 to body ground with a jumper wire.
    Fig 10: Connecting ECM Connector Terminal A4 To Body Ground With Jumper Wire
    G03681156Courtesy of AMERICAN HONDA MOTOR CO., INC.
  20. Turn the ignition switch ON (II).
  21. 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.
  22. Turn the ignition switch OFF.
  23. Disconnect ECM connector A (32P).
  24. Connect ECM connector terminal A4 to body ground with a jumper wire.
    Fig 11: Connecting ECM Connector Terminal A4 To Body Ground With Jumper Wire
    G03681157Courtesy of AMERICAN HONDA MOTOR CO., INC.
  25. Disconnect the EVAP canister vent shut valve 2P connector.
  26. Check for continuity between EVAP canister vent shut valve 2P connector terminal No. 2 and body ground.
    Fig 12: Checking For Continuity Between EVAP Canister Vent Shut Valve 2P Connector Terminal No. 2 And Body Ground
    G03681158Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES  -Go to step 27.
    2. NO  -Repair open in the wire between the EVAP canister vent shut valve and the ECM (A4).
  27. Turn the ignition switch ON (II).
  28. Measure voltage between EVAP canister vent shut valve 2P connector terminal No. 1 and body ground.
    Fig 13: Measuring Voltage Between EVAP Canister Vent Shut Valve 2P Connector Terminal No. 1 And Body Ground
    G03681159Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    1. YES  -Go to step 29.
    2. NO  -Repair open in the wire between the EVAP canister vent shut valve and the No. 4 (7.5 A) fuse in the under-dash fuse/relay box.
  29. At the sensor side, measure resistance between EVAP canister vent shut valve 2P connector terminals No. 1 and No. 2.
    Fig 14: Measuring Resistance Between EVAP Canister Vent Shut Valve 2P Connector Terminals No. 1 And No. 2
    G03681160Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there about 33 Ω at room temperature? 

    1. YES  -Update the ECM if it does not have the latest software, or substitute a known-good ECM (see ECM UPDATING AND SUBSTITUTION FOR TESTING-2006 M/T MODELS AND CVT MODEL ), then recheck. If the symptom/indication goes away with a known-good ECM, replace the original ECM (see ECM REPLACEMENT ).
    2. NO  -Replace the EVAP canister vent shut valve.
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