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 MANUALSMAZDA20105 SPORT, 2.3 L, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1 (ENGINE CONTROLS - SYSTEM & COMPONENT TESTING)ENGINE SENSORS & SWITCHESENGINE COOLANT TEMPERATURE (ECT) SENSORMIATA
2010 Mazda 5 Sport, 2.3 L, Standard
Engine Coolant Temperature (ECT) Sensor: Miata
2010 Mazda 5 Sport, 2.3 L, StandardSECTION Miata
WARNING: This page is about a different car, the 2001 Mazda Protege, 2001 Mazda Millenia, 2001 Mazda MX-5 Miata, 2001 Mazda MPV, and 2001 Mazda 626. However, it is still accessible from the selected car via links, so may be relevant.
- Coolant temperature sender is part of ECT sensor. Remove ECT sensor. ECT sensor is located on left side of engine. Place ECT sensor and thermometer in a container of water. Connect ohmmeter between ECT sensor terminals "A" and "B". See Fig 1 .
- Slowly heat water. Observe resistance reading at specified temperatures. See ENGINE COOLANT TEMPERATURE (ECT) SENSOR SPECIFICATIONS table. If resistance is not as specified, replace ECT sensor.
- To check coolant temperature sender portion of ECT sensor, measure resistance between ground and ECT sensor terminal "C". See Fig 1 . Resistance should be 160-230 ohms with sensor temperature at 122°F (50°C). Replace ECT sensor as necessary.
ENGINE COOLANT TEMPERATURE (ECT) SENSOR SPECIFICATIONS
| Temperature - °F (°C) | Ohms | |
|---|---|---|
| Miata | ||
| 68 (20) | 2270-2740 | |
| 176 (80) | 290-340 | |
| Millenia, MPV & Protege | ||
| 68 (20) | 2200-2600 | |
| 176 (80) | 290-340 | |
| 626 | ||
| 68 (20) | 35,500-39,200 | |
| 176 (80) | 7180-7920 | |
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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.