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Home › Lexus › 1997 › ES 300 › Repair and Diagnosis › Engine Performance › System › Engine Controls - System/Component Tests › Engine Sensors & Switches › Engine Coolant Temperature (ECT) Sensor

Engine Coolant Temperature (ECT) Sensor

  1. Turn ignition off. Disconnect negative battery cable. Drain coolant. Remove ECT sensor. Sensor is located on top front of engine.
  2. Models with sensing portion of ECT sensor submerged in water measure resistance between terminals. See Figure. Replace ECT sensor if resistance is not as specified. See ECT SENSOR RESISTANCE table.
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