ECT sensor No. 2

Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(US)] .)
Drain the engine coolant. (See ENGINE COOLANT REPLACEMENT .)
Remove the coolant control valve. (See COOLANT CONTROL VALVE REMOVAL/INSTALLATION .)
Remove the short cord.

Courtesy of MAZDA MOTORS CORP.
Remove the ECT sensor No. 2 using the SST.

Fig 1: ECT Sensor No. 2 With Torque Specification
Courtesy of MAZDA MOTORS CORP.
Install in the reverse order of removal.
Refill the engine coolant. (See ENGINE COOLANT REPLACEMENT .)