Engine Coolant Temperature (ECT) Sensor Inspection: Notes

1. Remove the battery cover. (See BATTERY REMOVAL/INSTALLATION .)
2. Disconnect the negative battery cable. (See BATTERY REMOVAL/INSTALLATION .)
3. Drain the engine coolant. (See ENGINE COOLANT REPLACEMENT .)
4. Disconnect the ECT sensor connector.
5. Remove the ECT sensor. (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR REMOVAL/INSTALLATION .)
6. Place the ECT sensor in water with a thermometer, and heat the water gradually.
7. Measure the resistance between ECT sensor terminals A and B.

Courtesy of MAZDA MOTORS CORP.

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