NOTE:

- Leave the idle air control (IAC) valve connected (K20A6 engine).
- 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

1. Disconnect the evaporative emission (EVAP) canister purge valve connector.

1. Connect the HDS to the data link connector (DLC) (A) located under the driver's side of the dashboard.

1. Start the engine. Hold the engine speed at 3,000 rpm (min −1 ) without load (in Park or neutral) until the radiator fan comes on, then let it idle.

1. Check the idle speed without load conditions: headlights, blower fan, radiator fan, and air conditioner off.

   Idle speed should be:

   K24A3 engine:

   M/T | 600±50 rpm (min −1 )
   A/T | 650±50 rpm (min −1 ) (in Park or neutral)

   K20A6 engine:

   M/T | 650±50 rpm (min −1 )
   A/T | 650±50 rpm (min −1 ) (in Park or neutral)

1. 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:

   M/T | 720±50 rpm (min −1 )
   A/T | 800±50 rpm (min −1 ) (in Park or neutral)

   NOTE: If the idle speed is not within specification, do the ECM/PCM idle learn procedure. If the idle is still out of specification, go to the symptom troubleshooting.

1. Reconnect the EVAP canister purge valve connector.