Vitara 4WD L4-2.0L (2003)
Idle Speed/Throttle Actuator - Electronic: Testing and Inspection
Idle Speed/Idle Air Control (IAC) Duty Inspection
Idle Speed / Idle Air Control (IAC) Duty Inspection
Before idle speed and IAC duty check, make sure of the following.
After above items are all confirmed, check idle speed and IAC duty as follows.
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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.
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 (1) with ignition switch OFF.
Special tool
(A): SUZUKI scan tool
2. Warm up engine to normal operating temperature.
Engine idle speed
A/C OFF: 750 ± 50 rpm
A/C ON: 800 ± 50 rpm
IAC duty at specified idle speed
2 - 30%
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 "Idle Air Control System Inspection".
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.
