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Engine Coolant Temperature Sensor

  1. Drain engine coolant. Remove ECT sensor. See ECT SENSOR LOCATIONS  table. Place ECT sensor and thermometer into a water bath.
    ECT SENSOR LOCATIONS

    Application Sensor Location
    LS430 Top Right Front Of Engine
  2. Measure resistance between terminal Nos. 1 and 2. See Fig 1. If resistance is not as specified, replace ECT sensor.
  3. Install NEW gasket on sensor, and install ECT sensor. Fill with engine coolant.
Fig 1: Measuring ECT Sensor Resistance
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