Idle Control System

Idle Speed Inspection


  • 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
  1. Disconnect the Evaporative Emission (EVAP) canister purge valve 2P connector.
  2. Connect a tachometer (A) to the test tachometer connector (B).

  1. Start the engine. Hold the engine at 3,000 rpm (min-1) with no load (in Park or neutral) until the radiator fan comes on, then let it idle.
  2. Turn the ignition switch OFF.
  3. Start the engine.Check the idle speed with no-load conditions: headlights, blower fan, rear defogger, radiator fan, and air conditioner are not operating.
    Idle speed should be:
    M/T 700+50 rpm (min-1)
    A/T 700+50 rpm (min-1)
    (in Park or neutral)

NOTE:ECM/PCM might control to raise the idle speed 750 rpm (min-1) in case of the battery performance,etc. In this case, idle speed is OK.Go to step 6.

  1. Idle the engine for 1 minute with heater fan switch on HI and air conditioner on, then check the idle speed.
    Idle speed should be:
    M/T 750+50 rpm (min-1)
    A/T 750+50 rpm (min-1)
    (in Park or neutral)

NOTE: If the idle speed in not within specification, see Symptom Chart.

  1. Reconnect the EVAP canister purge valve 2P connector.