Idle Speed: Testing and Inspection
Idle Speed InspectionNOTE:
- 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.
- Ignition timing
- Spark plugs
- Air cleaner
- PCV system
- 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 the HDS to the data link connector (DLC) under the driver's side of the dashboard.
3. Start the engine. Hold the engine at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle.
4. Check the idle speed without load conditions:
headlights, blower fan, radiator fan, and air conditioner off.
Idle speed should be:
K20A2 engine: 700 ± 50 rpm
K20A3 engine:
M/T: 700 ± 50 rpm
A/T: 700 ± 50 rpm (in Park or neutral)
K20Z1 engine: 800 ± 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:
K20A2 engine: 780 ± 50 rpm
K20Z1 engine: 850 ± 50 rpm
K20A3 engine:
M/T: 700 ± 50 rpm
A/T: 700 ± 50 rpm (in Park or neutral)
NOTE: If the idle speed is not within specification, go to Symptom Troubleshooting. Symptom Related Diagnostic Procedures
6. Reconnect the EVAP canister purge valve 2P connector.