Idle Speed/Idle Air Control (IAC) Duty Inspection
WARNING: This page is about a different car, the 2004 Suzuki XL-7 and 2004 Suzuki Grand Vitara. However, it is still accessible from the selected car via links, so may be relevant.
Before idle speed/IAC duty check, make sure of the following.
- Lead wires and hoses of engine/emission control systems are connected securely.
- Accelerator cable is adjusted.
- Ignition timing is within specification.
- All accessories (wipers, heater, lights, A/C, etc.) are out of service.
- Air cleaner has been properly installed and is in good condition.
- ECM (PCM) does not detect any malfunction DTC.
After above 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.
- Connect SUZUKI scan tool to DLC with ignition switch OFF.
Special tool
(A): SUZUKI scan tool
- Warm up engine to normal operating temperature.
- Check IAC duty and idle speed by using "Data List" mode of SUZUKI scan tool.
If duty and/or idle speed is out of specifications, check idle air control system referring to DTC P0505/P0506/P0507: IDLE CONTROL SYSTEM/RPM LOWER THAN EXPECTED/RPM HIGHER THAN EXPECTED .
- IAC duty at specified idle speed: 10-50%
- Check that specified engine idle speed is obtained with A/C ON if vehicle is equipped with A/C. If not, check A/C ON signal circuit and idle air control system.