Idle Speed: Testing and Inspection

Idle Speed Inspection

NOTE:

- 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

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

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

2. Connect the HDS to the data link connector (DLC) (A) located behind the driver's side of the front console.

3. Turn the ignition switch to ON (II).

4. Make sure the HDS communicates with the ECM. If it doesn't, go to the DLC circuit troubleshooting. Testing and Inspection

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

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





7. 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).





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

8. Reconnect the EVAP canister purge valve connector.