Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSLEXUS1998GS 300REPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESENSOR RANGE CHARTSENGINE CONTROLS - SENSOR OPERATING RANGE CHARTSINTRODUCTIONIDLE AIR CONTROL VALVE

1998 Lexus GS 300

Idle Air Control Valve

1998 Lexus GS 300SECTION Idle Air Control Valve

IDLE AIR CONTROL (IAC) VALVE RESISTANCE

Temperature °F (°C)

⁽¹⁾ Ohms

14-122°F (-10-50°C)

17-24.5

123-212°F (51-100°C)

21.5-28.5

⁽¹⁾	Measure resistance between Black/Yellow wire terminal and Red/White and Yellow/Black wire terminals at IAC valve.

RENDER: 1.0x

NO RELATED

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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.