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Home >> Mazda >> 2013 >> MX-5 Miata Club, Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Coolant Temperature (ECT) Sensor Inspection >> Resistance Inspection
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Resistance Inspection

  1. Remove the battery cover.
  2. Disconnect the negative battery cable. (See BATTERY REMOVAL/INSTALLATION [LF] ).
  3. Disconnect the ECT sensor connector.
  4. Remove the ECT sensor. (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR REMOVAL/INSTALLATION ).
  5. Place the ECT sensor in the water and while increasing the water temperature, measure the resistance between ECT sensor terminals A and B.
    • If the monitor item status/specification (reference) is not within the specification, even though the ECT sensor resistance is within the specification, perform the "Circuit Open/Short Inspection".
    • If not within the specification, replace the ECT sensor. (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR REMOVAL/INSTALLATION )
STANDARD

Water temperature (°C {°F}) Resistance (kilohm)
20 {68} 35.48-39.20
80 {176} 3.65-4.02
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