Honda Accord: Idle Speed Inspection - Idle Control System - Fuel and Emissions - Honda Accord MK8 2008-2012 Service ManualHonda Accord: Idle Speed Inspection

NOTE: - Before checking the idle speed, check these items:

 - The malfunction indicator lamp (MIL) has not been reported on, and there are no DTCs.

 - Ignition timing

 - Spark plugs

 - Air cleaner

 - PCV system

- Apply the parking brake, and make sure the headlights are off.

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

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

3. Make sure the HDS communicates with the


3. Make sure the HDS communicates with the ECM/PCM. If it doesn't, go to the DLC circuit troubleshooting (see page 11-181).

4. Start the engine. Hold the engine speed at 3,000 rpm without load (A/T in P or N, M/T in neutral) until the radiator fan comes on, then let it idle.

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

Idle speed should be:

6. Let the engine idle for 1 minute with high electric load


6. Let the engine idle for 1 minute with high electric load (A/C on, temperature set to max cool, blower fan on high, headlights on high beam).

Idle speed should be:

NOTE: If the idle speed is not within specification, do


NOTE: If the idle speed is not within specification, do the ECM/PCM idle learn procedure (see page 11-293).

If the idle speed is still not within specification, go to the symptom troubleshooting.

7. Reconnect the EVAP canister purge valve connector.

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    ECM/PCM Idle Learn Procedure
    The idle learn procedure must be done so the ECM/PCM can learn the engine idle characteristics. Do the idle learn procedure whenever you do any of these actions:  - Replace ECM/PCM.   ...

    See also:

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