Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSHONDA2009S2000 BASEREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 3 (IDLE CONTROL SYSTEM)IDLE SPEED INSPECTION

2009 Honda S2000 Base

Idle Speed Inspection

2009 Honda S2000 BaseSECTION 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.

Disconnect the EVAP canister purge valve 2P connector.
Connect a tachometer.

Fig 1: Disconnecting EVAP Canister Purge Valve 2P Connector
Courtesy of AMERICAN HONDA MOTOR CO., INC.
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.
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
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.
Reconnect the EVAP canister purge valve 2P connector.

RENDER: 1.0x

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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.