Mazda 3 Service Manual: 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. 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 using the SST

.

7. Install in the reverse order of removal.

8. Refill the engine coolant..

ECT Sensor No.2

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 using the SST

.

NOTE:

• Wipe off any oil or engine coolant if it gets on the ECT sensor No.2 installation area.

6. Install in the reverse order of removal.

7. Refill the engine coolant..