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 (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.

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 AC 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".

Engine idle speed
A/C OFF: 675 ± 50 rpm
A/C ON: 800 ± 50 rpm

IAC duty at specified idle speed
10 - 50%

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 ON signal circuit and idle air control system.