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Resistance inspection

WARNING: This page is about a different car, the 2014 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.
  1. Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION .)
  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. Pull out the ventilation hose from the air hose and set it aside. (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR REMOVAL/INSTALLATION .)
  6. Remove the clips and loosen the wiring harness. (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.
    Fig 1: Checking ECT Sensor No. 1 Resistance
    G09785523Courtesy of MAZDA MOTORS CORP.
  10. Measure the resistance between ECT sensor No. 1 terminals A and B.
    ECT SENSOR NO. 1 (SKYACTIV-G 2.5) SPECIFICATION

    ECT (°C {°F}) Resistance (Kilohms)
    20 {68} Approx. 2.45
    80 {176} Approx. 0.318
    Fig 2: ECT Sensor No. 1 Resistance Graph
    G09785524Courtesy of MAZDA MOTORS CORP.
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