Idle Speed Inspection

NOTE:

Leave the idle air control (IAC) valve connected.
Before checking the idle speed, check these items:
- The malfunction indicator lamp (MIL) has not been reported on.
- There are no vacuum leaks
- Ignition timing
- Throttle cable adjustment
- Spark plugs
- Air cleaner
- PCV system
Pull the parking brake lever up. Start the engine, and make sure the headlights are off.

Disconnect the evaporative emission (EVAP) canister purge valve 2P connector.
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.

Fig 1: Connecting A Tachometer To Test Tachometer Connector
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Fig 2: Connecting HDS Or A Scan Tool To Data Link Connector (2002 Model)
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Start the engine. Hold the engine at 3,000 RPM with no load (in Park or neutral) until the radiator fan comes on, then let it idle.
Check the idle speed with no-load conditions: headlights, blower fan, radiator fan, and air conditioner off.
Idle speed should be:

Fig 3: Idle Speed Specifications
Courtesy of AMERICAN HONDA MOTOR CO., INC.
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:

Fig 4: Idle Speed Specifications
Courtesy of AMERICAN HONDA MOTOR CO., INC.

NOTE: If the idle speed is not within specification, go to the Symptom Troubleshooting.
Reconnect the EVAP canister purge valve 2P connector.