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.
1997 Lexus GS 300FACTORY OEM SERVICE PROCEDURE
IAC Valve Resistance
Remove IAC valve from throttle body. Measure resistance between the following terminals of IAC valve connector. See Figure.
- Terminals B1 and S1.
- Terminals B1 and S3.
- Terminals B2 and S2.
- Terminals B2 and S4.
If resistance is not as specified, replace IAC valve. See IAC VALVE RESISTANCE table.
IAC VALVE RESISTANCE
| Temperature: °F (°C) | Ohms |
|---|---|
| 14-122 (-10-50) | 15-25 |
| 123-212 (51-100) | 20-30 |
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.