Idle Speed/Idle Air Control (IAC) Duty Inspection

Idle Speed / Idle Air Control (IAC) Duty Inspection

Before idle speed / IAC duty check, make sure of the following.
- Lead wires and hoses of engine and emission control systems are connected securely.
- Accelerator cable has some play, that is, it is not tight.
- All accessories (wipers, heater, lights, A/C, etc.) are out of service.
- Air cleaner has been properly installed and is in good condition.
- Ignition timing is within specification.
- No abnormal air inhaling from air intake system.

After the items are all confirmed, check idle speed and IAC duty as follows.




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:

Engine idle speed and IAC duty
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.