Civic Si L4-2.0L (2004)
Idle Speed: Testing and Inspection
Idle Speed Inspection
NOTE:
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Leave the idle air control (IAC) valve connected.
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Before checking the idle speed, check these items:
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The malfunction indicator lamp (MIL) has not been reported on.
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Ignition timing
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Spark plugs
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Air cleaner
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PCV system
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Pull the parking brake lever up. Start the engine, and make sure the headlights are off.
1. Disconnect the evaporative emission (EVAP) canister purge valve 2P connector.
2. Connect a tachometer (A) to the test tachometer connector (B), or connect the HDS or a scan tool to the data link connector (DLC) (C) located
under the driver's side of the dashboard.
3. Start the engine. Hold the engine at 3,000 rpm with no load (in neutral) until the radiator fan comes on, then let it idle.
4. Check the idle speed with no-load conditions: headlights, blower fan, radiator fan, and air conditioner off.
Idle speed should be: .............................................................................................................................................................................. 750 ± 50 rpm
5. Let the engine idle for 1 minute with the heater fan switch on HI and air conditioner on, then check the idle speed.
Idle speed should be: .............................................................................................................................................................................. 750 ± 50 rpm
NOTE: If the idle speed is not within specification, go to the Symptom Troubleshooting. See: Computers and Control Systems/Testing and
Inspection/Symptom Related Diagnostic Procedures
6. Reconnect the EVAP canister purge valve 2P connector.
