Aerio L4-2.3L (2006)
Idle Speed: Testing and Inspection
Idle Speed / Idle Air Control (IAC) Duty Inspection
Before idle speed / IAC duty check, make sure of the following.
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Lead wires and hoses of engine and emission control systems are connected securely.
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Accelerator cable has some play, that is, it is not tight.
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All accessories (wipers, heater, lights, A/C, etc.) are out of service.
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Air cleaner has been properly installed and is in good condition.
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Ignition timing is within specification.
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No abnormal air inhaling from air intake system.
After the items are all confirmed, check idle speed and IAC duty as follows.
NOTE: Before starting engine, place transmission gear shift lever in "Neutral" (shift selector lever to "P" range for A/T vehicle), and set parking brake
and block drive wheels.
1. Connect SUZUKI scan tool to DLC with ignition switch OFF.
Special Tool
(A): SUZUKI scan tool
2. Warm up engine to normal operating temperature.
3. Check engine idle speed and IAC duty as follows:
a. Select "Data List" mode on scan tool to check idle speed and IAC duty. Engine idle speed and IAC duty
If duty and/or idle speed is out of specifications, inspect idle air control system.
4. Check that specified engine idle speed is obtained with A/C ON if vehicle is equipped with A/C.
If not, check A/C control circuits and idle air control system.
