Esteem L4-1590cc 1.6L SOHC 0 MFI 16V (1995)
Idle Air Control (IAC) Valve: Adjustments
Before idle speed/Idle Air Control (IAC) duty check and adjustment, make sure of the following.
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Lead wires and hoses of Electronic Fuel Injection and 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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No abnormal air inhaling from air intake system.
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. Warm up engine to normal operating temperature.
2. Using service wire, ground diagnosis switch terminal in diagnosis connector 1 and make sure that malfunction indicator lamp ("CHECK ENGINE"
light) indicate diagnostic trouble code No.12. The diagnosis connector 1 is located in the relay box.
3. Stop engine and connect duty meter between duty output terminal and ground terminal in diagnosis connector 1.
4. Set tachometer.
5. Start engine and warm it up completely.
6. Check IAC duty and idle speed. If duty and/or idle speed is out of specifications, inspect idle air control system.
