ECT Sensor No. 2 Inspection

1. Remove the battery cover. (See BATTERY REMOVAL/INSTALLATION [LF, L5] .)
2. Disconnect the negative battery cable.
3. Drain the engine coolant. (See COOLING SYSTEM SERVICE WARNINGS .)
4. Disconnect the ECT sensor No. 2 connector.
5. Remove the ECT sensor No. 2. (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR REMOVAL/INSTALLATION .)
6. Place the ECT sensor No. 2 in water with a thermometer, and heat the water gradually.
7. Measure the resistance between the ECT sensor No. 2 terminals A and B using an ohmmeter.
   • If not as specified, replace the ECT sensor No. 2.

     (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR REMOVAL/INSTALLATION .)

ECT sensor No. 2 Specification 

Fig 1: Identifying ECT Sensor No. 2 Connector Terminals

Courtesy of MAZDA MOTORS CORP.