Idle Speed Inspection

WARNING: This page is about a different car, the 2009 Honda S2000, 2008 Honda S2000, 2007 Honda S2000, and 2006 Honda S2000. However, it is still accessible from the selected car via links, so may be relevant.

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.

Disconnect the evaporative emission (EVAP) canister purge valve connector.
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
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Turn the ignition switch ON (II).
Make sure the HDS communicates with the vehicle and the ECM. If it doesn't, go to DLC CIRCUIT TROUBLESHOOTING .
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 without load conditions: headlights, blower fan, radiator fan, and air conditioner off.
Idle speed should be: 900+/-50rpm
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.
Reconnect the EVAP canister purge valve connector.