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.

1996 Lexus SC 400FACTORY OEM SERVICE PROCEDURE

Idle Air Control Valve

IDLE AIR CONTROL (IAC) VALVE RESISTANCE ⁽¹⁾

Application

Ohms

Cold ⁽²⁾

31-61

Hot ⁽³⁾

38-71

⁽¹⁾	Measure resistance between terminal B1 and terminals S1 and S3. Also, measure resistance between terminal B2 and terminals S2 and S4.

⁽²⁾	IAC valve temperature of 14-122°F (-10-50°C).

⁽³⁾	IAC valve temperature of 123-212°F (51-100°C).

Factory Service Tools

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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.

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