Idle Speed: Testing and 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/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 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.

Using SUZUKI Scan Tool

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 IAC duty and idle speed by using "Data List" mode of SUZUKI scan tool.

Engine idle speed
A/C OFF: 700 r/min.
A/C ON: 750 r/min.

IAC duty at specified idle speed
5 - 40% (at A/C OFF)

4. If duty and/or idle speed is out of specifications, check idle air control system.
5. 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.