ECT Sensor No. 1

WARNING: This page is about a different car, the 2014 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION .)
Remove the plug hole plate. (See PLUG HOLE PLATE REMOVAL/INSTALLATION .)
Drain the engine coolant. (See ENGINE COOLANT REPLACEMENT .)
Pull out the evaporative hose No. 1 from the catch tank and set it aside.

Fig 1: Pulling Out Evaporative Hose No. 1 From Catch Tank
Courtesy of MAZDA MOTORS CORP.
Pull out the ventilation hose from the air hose and set it aside.

Fig 2: Pulling Out Ventilation Hose From Air Hose
Courtesy of MAZDA MOTORS CORP.
Remove the clips and loosen the wiring harness.

Fig 3: Locating Control System Wiring Harness Clips
Courtesy of MAZDA MOTORS CORP.
Disconnect the ECT sensor No. 1 connector.
Remove the ECT sensor No. 1 using the SST .
Install in the reverse order of removal.
Refill the engine coolant. (See ENGINE COOLANT REPLACEMENT .)

Fig 4: ECT Sensor No. 1 And SST With Torque Specifications
Courtesy of MAZDA MOTORS CORP.