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.
Engine Coolant Temperature (ECT) Sensor
Remove engine coolant temperature sensor. Place sensor and thermometer in container of coolant. Connect ohmmeter to sensor terminals. Slowly heat coolant. Note resistance at specified temperatures. See ECT SENSOR RESISTANCE table. Replace sensor as necessary.
| Temperature | Ohms |
|---|---|
| 50°F (10°C) | 59,175 |
| 68°F (20°C) | 37,387 |
| 86°F (30°C) | 24,215 |
| 104°F (40°C) | 16,043 |
| 122°F (50°C) | 10,850 |
| 140°F (60°C) | 7,487 |
| 158°F (70°C) | 5,268 |
| 176°F (80°C) | 377 |
| 194°F (90°C) | 275 |
| 212°F (100°C) | 203 |
| 230°F (110°C) | 152 |
| 240°F (120°C) | 115 |
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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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