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Home >> Mazda >> 2014 >> 3 Sport, 4D Hatchback, Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Coolant Temperature (ECT) Sensor Inspection >> ECT Sensor No. 1 >> Resistance inspection

Resistance inspection

  1. Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5] .)
  2. Remove the plug hole plate. (See PLUG HOLE PLATE REMOVAL/INSTALLATION .)
  3. Drain the engine coolant. (See ENGINE COOLANT REPLACEMENT .)
  4. Pull out the evaporative hose No. 1 from the catch tank and set it aside. (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR REMOVAL/INSTALLATION .)
  5. Remove the clip from the bracket and loosen the wiring harness. (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR REMOVAL/INSTALLATION .)
  6. Set the wiring harness aside. (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR REMOVAL/INSTALLATION .)
  7. Disconnect the ECT sensor No. 1 connector.
  8. Remove the ECT sensor No. 1. (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR REMOVAL/INSTALLATION .)
  9. Place the ECT sensor No. 1 in water with a thermometer, and heat the water gradually.
  10. Measure the resistance between ECT sensor No. 1 terminals A and B.
    • If not as specified, replace the ECT sensor No. 1. (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR REMOVAL/INSTALLATION .)
      ECT RESISTANCE SPECIFICATION (REFERENCE)

      ECT (°C {°F}) Resistance (Kilohms)
      20 {68} Approx. 2.45
      80 {176} Approx. 0.318
      Fig 1: Measuring Resistance Between ECT Sensor No. 1 Terminals A And B
      G09758722Courtesy of MAZDA MOTORS CORP.
      Fig 2: ECT Sensor Resistance Versus Temperature Graph
      G09796911Courtesy of MAZDA MOTORS CORP.
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