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Home >> Mazda >> 2021 >> CX-9 Touring, FWD >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Coolant Temperature (ECT) Sensor Inspection >> ECT sensor >> Resistance Inspection
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Resistance Inspection

  1. Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .)
  2. Drain the engine coolant. (See ENGINE COOLANT REPLACEMENT .)
  3. Remove the ECT sensor. (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR REMOVAL/INSTALLATION .)
  4. Place the ECT sensor in water with a thermometer, and heat the water gradually.
    G12232004Courtesy of MAZDA MOTORS CORP.
  5. Measure the resistance between ECT sensor terminals A and B.
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