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Home › Mazda › 2021 › 3 Base › Repair and Diagnosis › External Pages › Different variant/trim › Section 20 (Engine Control System (VIN M)) › Engine Coolant Temperature (ECT) Sensor Removal/Installation › ECT sensor No. 1

ECT sensor No. 1

WARNING: This page is about a different variant/trim than selected.
  1. Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION (US) .)
  2. Drain the engine coolant. (See ENGINE COOLANT REPLACEMENT .)
  3. Lift up the vehicle.
  4. Remove the front under cover No. 2. (See FRONT UNDER COVER No. 2 REMOVAL/INSTALLATION .)
  5. Disconnect the ECT sensor connector.
  6. Remove the ECT sensor No. 1 using the SST.
    Fig 1: Engine Coolant Temperature Sensor No. 1 With Torque Specification
    G13714365Courtesy of MAZDA MOTORS CORP.
  7. Install in the reverse order of removal.
  8. Refill the engine coolant. (See ENGINE COOLANT REPLACEMENT .)
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