Vitara JS (2Dr) 2WD L4-1.6L DOHC MFI (1999)
Idle Air Control (IAC) Valve: Testing and Inspection
On-Vehicle Inspection
Before idle speed and IAC duty check, make sure of the following.
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Lead wires and hoses of engine/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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Valve lash is checked and adjusted according to maintenance schedule.
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Ignition timing is within specification.
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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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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, Tech 1
(B): Mass storage cartridge
(C): 16/14 pin DLC cable (OBD-II adapter cable)
2. Warm up engine to normal operating temperature.
3. Check idle speed and IAC duty by using "Data List" mode of SUZUKI scan tool.
If idle speed and /or IAC duty is out of specifications, check idle air control system referring to "Diagnostic Flow Table B-4 IDLE AIR
CONTROL SYSTEM CHECK".
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 signal circuit and idle air control system.