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 MANUALSMAZDA20133 MAZDASPEED, 2.3L ENG VIN 3REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 24 (ENGINE CONTROL SYSTEM [MZR 2.0, MZR 2.5])ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTIONECT SENSOR NO.2 INSPECTIONRESISTANCE INSPECTION
2013 Mazda 3 Mazdaspeed, 2.3L Eng VIN 3
Resistance inspection
2013 Mazda 3 Mazdaspeed, 2.3L Eng VIN 3SECTION Resistance inspection
WARNING: This page is about a different variant/trim than selected.
WARNING:
- When the engine is hot, it can badly burn. Turn off the engine and wait until it is cool before removing the ECT sensor.
- Remove the battery cover. (See BATTERY REMOVAL/INSTALLATION [MZR 2.0, MZR 2.5] .)
- Disconnect the negative battery cable. (See BATTERY REMOVAL/INSTALLATION [MZR 2.0, MZR 2.5] .)
- Drain the engine coolant. (See ENGINE COOLANT REPLACEMENT .)
- Disconnect the ECT sensor No.2 connector.
- Remove the ECT sensor No.2. (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR REMOVAL/INSTALLATION .)
- Place the ECT sensor No.2 in water with a thermometer, and heat the water gradually.
- Measure the resistance between ECT sensor No.2 terminals A and B.
- If not as specified, replace the ECT sensor No.2. (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR REMOVAL/INSTALLATION .)
SPECIFICATIONECT (°C {°F}) Resistance (kilohms) 20 {68} Approx. 2.45 80 {176} Approx. 0.318
RENDER: 1.0x
NO RELATED
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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.