Mazda 3 Service Manual: Engine Coolant Temperature (ECT) Sensor Inspection [Mzr 2.0, Mzr 2.5]

Mazda 3 Service Manual / Engine / Cooling / Engine Coolant Temperature (ECT) Sensor Inspection [Mzr 2.0, Mzr 2.5]

ECT Sensor No.1

Resistance inspection

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.

1. Remove the battery cover..

2. Disconnect the negative battery cable..

3. Drain the engine coolant..

4. Remove the battery and battery tray..

5. Disconnect the ECT sensor No.1 connector.

6. Remove the ECT sensor No.1..

7. Place the ECT sensor No.1 in water with a thermometer, and heat the water gradually.

8. Measure the resistance between ECT sensor No.1 terminals A and B.

If not as specified, replace the ECT sensor No.1..

Specification


ECT (°C {°F})	Resistance (kilohms)
20 {68}	Approx. 37.34
80 {176}	Approx. 3.84

ECT Sensor No.2 Inspection

Resistance inspection

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.

1. Remove the battery cover..

2. Disconnect the negative battery cable..

3. Drain the engine coolant..

4. Disconnect the ECT sensor No.2 connector.

5. Remove the ECT sensor No.2..

6. Place the ECT sensor No.2 in water with a thermometer, and heat the water gradually.

7. Measure the resistance between ECT sensor No.2 terminals A and B.

If not as specified, replace the ECT sensor No.2..

Specification


ECT (°C {°F})	Resistance (kilohms)
20 {68}	Approx. 2.45
80 {176}	Approx. 0.318

Engine Coolant Replacement [Mzr 2.0, Mzr 2.5]

WARNING: Never remove the cooling system cap or loosen the radiator drain plug while the engine is running, or when the engine and radiator are hot. Scalding engine coolant and steam may ...

Engine Coolant Temperature (ECT) Sensor Removal/Installation [Mzr 2.0, Mzr 2.5]

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. ECT Sensor No.1 1. Remove the battery cover.. 2. D ...

Other materials:

Antenna Amplifier Removal/Installation
With Audio Unit (Without Display) 1. Disconnect the negative battery cable.. 2. Remove the rain sensor cover. (Vehicles with auto light/wiper system). 3. Disconnect the rain sensor connector. (Vehicles with auto light/wiper system) 4. Partially peel back the seaming welts. 5. Remove the fo ...

Plastic Part Maintenance
When cleaning the plastic lenses of the lights, do not use gasoline, kerosene, rectified spirit, paint, thinner, highly acidic detergents, or strongly alkaline detergents. Otherwise, these chemical agents can discolor or damage the surfaces resulting in a significant loss in functio ...

Expansion Valve Removal/Installation
1. Disconnect the negative battery cable.. 2. Discharge the refrigerant from the system.. CAUTION: If moisture or foreign material enters the refrigeration cycle, cooling ability will be lowered and abnormal noise will occur. Always immediately plug all open fittings after removing ...