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Valve Test

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2005 Honda S2000, 2004 Honda S2000, 2003 Honda S2000, 2002 Honda S2000, and 2001 Honda S2000. However, it is still accessible from the selected car via links, so may be relevant.
  1. Make sure the fuel tank is less than half full.
  2. Remove the fuel fill cap.
  3. Remove the fuel pipe cover. Disconnect the fuel tank vapor signal tube (A).
    Fig 1: Disconnecting Fuel Tank Vapor Signal Tube
    G03692873Courtesy of AMERICAN HONDA MOTOR CO., INC.
  4. Disconnect the vacuum hoses (A) from the EVAP canister (B), and then plug the ports with plugs (C).
    Fig 2: Disconnecting Vacuum Hoses From EVAP Canister
    G03692874Courtesy of AMERICAN HONDA MOTOR CO., INC.
  5. Disconnect the vacuum hose (D) from the EVAP canister vent shut valve (E), and connect a commercially available vacuum pump/gauge, 0-30 in.Hg, to the EVAP canister vent shut valve.
  6. Pump the vacuum pump 80 times.
    • If the vacuum holds, go to step 7.
    • If the vacuum does not hold, go to step  9.
  7. Connect a second vacuum pump/gauge to the fuel tank vapor signal tube (A).
    Fig 3: Connecting A Second Vacuum Pump/Gauge To Fuel Tank Vapor Signal Tube
    G03692875Courtesy of AMERICAN HONDA MOTOR CO., INC.
  8. Apply vacuum (1 pump) to the fuel tank vapor signal tube (A), then check the vacuum on the pump in step  6.
  9. Disconnect the fuel tank vapor quick disconnect from the EVAP canister, then plug the port on the canister. Reapply vacuum (80 pumps).
    • If the vacuum holds, replace the fuel tank vapor control valve (see FUEL TANK VAPOR CONTROL VALVE REPLACEMENT  ).
    • If the vacuum does not hold, inspect the EVAP canister vent shut valve O-ring. If the O-ring is OK, replace the EVAP canister and repeat step  4.
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