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Home >> Mazda >> 2018 >> MX-5 Miata Club, Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Coolant Temperature (ECT) Sensor Inspection >> ECT sensor No. 1 >> Resistance Inspection
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Resistance Inspection

  1. Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION ).
  2. Drain the engine coolant. (See ENGINE COOLANT REPLACEMENT ).
  3. Disconnect the ECT sensor No. 1 connector.
  4. Remove the ECT sensor No. 1 using the SST. (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR REMOVAL/INSTALLATION ).
  5. Place the ECT sensor No. 1 in water with a thermometer, and heat the water gradually.
    Fig 1: Placing ECT Sensor No. 1 In Water With Thermometer
    G11274168Courtesy of MAZDA MOTORS CORP.
  6. Measure the resistance between ECT sensor No. 1 terminals A and B.
RESISTANCE SPECIFICATION

ECT (°C {°F}) Resistance (Kilohms)
20 {68. EN_US} Approx. 2.45
80 {176. EN_US} Approx. 0.318
Fig 2: Engine Coolant Temperature Sensor Resistance Graph
G11274169Courtesy of MAZDA MOTORS CORP.
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