ECT Sensor No. 1

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: Locating Evaporative Hose
Courtesy of MAZDA MOTORS CORP.
Pull out the ventilation hose from the air hose and set it aside.

Fig 2: Removing Ventilation Hose
Courtesy of MAZDA MOTORS CORP.
Remove the clips and loosen the wiring harness.

Fig 3: Removing Clips
Courtesy of MAZDA MOTORS CORP.
Disconnect the ECT sensor No. 1 connector.
Remove the ECT sensor No. 1 using the SST.

Fig 4: Removing ECT Sensor
Courtesy of MAZDA MOTORS CORP.
Install in the reverse order of removal.
Refill the engine coolant. (See ENGINE COOLANT REPLACEMENT .)