2012 Mazda 5 TouringFACTORY OEM SERVICE PROCEDURE

Engine Coolant Temperature (ECT) Sensor Inspection

  1. Remove the battery cover. (See BATTERY REMOVAL/INSTALLATION [MZR 2.5] .)
  2. Disconnect the negative battery cable. (See BATTERY REMOVAL/INSTALLATION [MZR 2.5] .)
  3. Drain the engine coolant. (See ENGINE COOLANT REPLACEMENT .)
  4. Disconnect the ECT sensor connector.
  5. Remove the ECT sensor. (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR REMOVAL/INSTALLATION .)
  6. Place the ECT sensor in water with a thermometer, and heat the water gradually.
  7. Measure the resistance between ECT sensor terminals A and B.
    Fig 1: Identifying ECT Sensor Connector Terminals A And B
    G08150328
    ECT SENSOR SPECIFICATION

    ECT (°C {°F}) Resistance (kilohms)
    20 {68} 35.48-39.20
    80 {176} 3.65-4.02
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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