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Home >> Mazda >> 2016 >> CX-5 Touring, FWD >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control System (Service Information) >> Engine Coolant Temperature (ECT) Sensor Inspection >> ECT Sensor No. 1
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ECT Sensor No. 1

  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 clip 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: Placing ECT Sensor No. 1 In Water With Thermometer
    G10916569Courtesy of MAZDA MOTORS CORP.
  10. Measure the resistance between ECT sensor No. 1 terminals A and B.
ECT SENSOR NO. 1 TERMINALS RESISTANCE SPECIFICATION

ECT (°C {°F}) Resistance (Kilohms)
20 Approx. 2.45
80 Approx. 0.318
Fig 2: ECT Sensor No. 1 Temperature Graph
G10916570Courtesy of MAZDA MOTORS CORP.
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