NOTE: Only component testing procedure is covered. For Idle Air Control (IAC) valve system and circuit testing procedure, see appropriate SELF-DIAGNOSTICS article.

Turn ignition off. Disconnect Idle Air Control (IAC) valve 3-pin harness connector for Optima & Magentis (Canadian), Rio, Spectra and Sportage, and 6-pin harness connector for Sedona. For IAC valve location, see Figure-Figure . Check resistance between IAC valve terminals. For IAC valve terminal identification and resistance specification. See Fig 1. See IDLE AIR CONTROL VALVE RESISTANCES table. If resistances are not as specified, replace IAC valve. For IAC valve removal and installation, see IDLE AIR CONTROL VALVE under AIR INDUCTION SYSTEM in REMOVAL, OVERHAUL & INSTALLATION article.

Fig 1: Identifying Idle Air Control Valve Connector Terminals

Courtesy of KIA MOTORS AMERICA, INC.

IDLE AIR CONTROL VALVE RESISTANCES

Measure Between Terminals No.

⁽¹⁾ Resistance - Ohms

Optima & Magentis (Canadian)

1 & 2

17-18

2 & 3

15-16

Rio

1 & 2

16.5-18.5

2 & 3

14.5-16.5

Sedona

1 & 2

29-38

2 & 3

29-38

4 & 5

29-38

5 & 6

29-38

Spectra

1 & 2

16.5-18.5

2 & 3)

14.5-16.5

Sportage

1 & 2

16.5-18.5

2 & 3

14.5-16.5

⁽¹⁾	At 68° F (20° C).

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

Idle Air Control Valve

Use the Manual With the Right Hardware

When to See a Mechanic

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