ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION [MZR 1.6]

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Resistance Inspection

Warning

•  A hot engine can cause severe burns. Turn off the engine and wait until it is cool before removing the ECT sensor.

1.  Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [MZR 1.6].)

2.  Drain the engine coolant. (See ENGINE COOLANT REPLACEMENT [MZR 1.6].)

3.  Disconnect the ECT sensor connector.

4.  Remove the ECT sensor. (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR REMOVAL/INSTALLATION [MZR 1.6].)

5.  Place the ECT sensor in water with a thermometer, and heat the water gradually.

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6.  Measure the resistance between ECT sensor terminals A and B.

•  If not as specified, replace the ECT sensor. (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR REMOVAL/INSTALLATION [MZR 1.6].)

Specification (Reference)

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

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