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Home >> Eagle >> 1989 >> Premier ES >> Repair and Diagnosis >> Engine Performance >> Ignition System - Electronic >> Testing >> Sensors >> Coolant Temperature Sensor (CTS)

Coolant Temperature Sensor (CTS)

  1. With the engine at room temperature 70°F (20°C), unplug sensor wire connector. Using digital volt-ohmmeter (DVOM), test the sensor resistance. It should be between 3000-4000 ohms.
  2. Start engine and bring to operating temperature. At 100°F (38°C) the resistance should be 1600 ohms, at 160°F (70°C) resistance should be 450 ohms and at 212°F (100°C) resistance should be 185 ohms. If readings are not to specifications, replace sensor.
  3. Using DVOM check resistance between ECU terminal "C10" and CTS sensor wire connector. Also check resistance between ECU terminal "D12" and CTS sensor wire connector. If either resistance is greater than one ohm, replace or repair sensor wire harness.
    NOTE: The Electronic Control Unit (ECU) is located under the instrument panel on passenger side of vehicle.
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