2009 Honda S2000 BaseFACTORY OEM SERVICE PROCEDURE

Idle Speed Inspection

NOTE:
  • Before checking the idle speed, check these items:
    • The malfunction indicator lamp (MIL) has not been reported on.
    • Ignition timing
    • Spark plugs-Air cleaner
    • PCV system
  • Set the parking brake.
  1. Disconnect the evaporative emission (EVAP) canister purge valve connector.
  2. Connect the HDS to the data link connector (DLC) (A) located behind the driver's side of the front console.
    Fig 1: Connecting HDS To Data Link Connector
    G03693218Courtesy of AMERICAN HONDA MOTOR CO., INC.
  3. Turn the ignition switch ON (II).
  4. Make sure the HDS communicates with the vehicle and the ECM. If it doesn't, go to DLC CIRCUIT TROUBLESHOOTING .
  5. 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.
  6. Check the idle speed without load conditions: headlights, blower fan, radiator fan, and air conditioner off.

    Idle speed should be: 900+/-50rpm 

  7. Let the engine idle for 1 minute with high electric load (A/C switch ON, temperature set to Max Cool, blower fan on High, rear window defogger ON, and headlights on high beam).

    Idle speed should be: 900+/-50 RPM 

    NOTE: If the idle speed is not within specification, do ECM IDLE LEARN PROCEDURE  . If the idle is still out of specification, go to the symptom troubleshooting.
  8. Reconnect the EVAP canister purge valve connector.
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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