Idle Speed Inspection

L15A2, L15A4 engines

  • 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), 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 speed at 3,000 rpm (min-1) 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, rear defogger, radiator fan, and air conditioner are not operating.

Idle speed should be:
M/T 750±50 rpm (min-1) (in neutral) 
CVT 750±50 rpm (min-1) (in Park or neutral) 

5.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 850±50 rpm (min-1) (in neutral) 
CVT 850±50 rpm (min-1) (in Park or neutral) 

NOTE: If the idle speed is not within specification, see the symptom troubleshooting.

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

NOTE: You can use the HDS or a scan tool to inspect idle speed.