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Idle Speed Inspection

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.
NOTE:
  • Leave the IAC valve connected.
  • Before checking the idle speed, check these items:
    • The MIL has not been reported on.
    • Ignition timing
    • Spark plugs
    • Air cleaner
    • PCV system
  • On Canadian models, pull the parking brake lever up. Start the engine, then check that the headlights are off.
  1. Disconnect the EVAP canister purge valve 2P connector.
  2. Connect a tachometer.
    Fig 1: Disconnecting EVAP Canister Purge Valve 2P Connector
    G03692749Courtesy of AMERICAN HONDA MOTOR CO., INC.
  3. Start the engine. Hold the engine speed at 3,000 RPM without load (in neutral) until the radiator fan comes on, then let it idle.
  4. Check the idle speed at idle without load conditions: headlights, blower fan, radiator fan, and air conditioner off.

    Idle speed should be: 800+/-50 RPM 

  5. Let the engine idle for 1 minute with high electric load (A/C switch ON, temperature set to Max cool, blower fan on High, and head light on high beam).

    Idle speed should be: 900+/-50 RPM 

    NOTE: If the idle speed is not within specification, do the symptom troubleshooting.
  6. Reconnect the EVAP canister purge valve 2P connector.
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