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.
2002 Lexus SC 430FACTORY OEM SERVICE PROCEDURE
Engine Coolant Temperature (ECT) Sensor
- Ensure ignition is off. Locate ECT sensor. See ENGINE COOLANT TEMPERATURE (ECT) SENSOR LOCATION table. Remove ECT sensor.
- Place probe end of ECT sensor and thermometer in container of water. Attach ohmmeter between ECT sensor terminals. Heat water and note that resistance is within specification in relation to temperature. See Fig 1. Replace ECT sensor if resistance is not within specification.
- Using NEW gasket, install ECT sensor. Tighten ECT sensor to 14 ft. lbs. (19.6 N.m). Fill cooling system.
ENGINE COOLANT TEMPERATURE (ECT) SENSOR LOCATION
| Model | Location |
|---|---|
| GS300 | Left Front Of Cylinder Head; Black 2-Pin Connector With Black/Red & Brown Wires |
| GS430, LS430 & SC430 | Near Throttle Body; Black 2-Pin Connector With Red/Blue & Brown Wires |
| IS300 | Left Front Of Cylinder Head; Green 2-Pin Connector With Red & Brown Wires |
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.