Coolant Temperature Sensor/Switch (For Computer): Testing and Inspection

Diagnostic Trouble Code (DTC) 14 or DTC 15 indicates a failure in the engine coolant temperature sensor circuit. Refer to System Diagnosis. Testing and Inspection
Most scan tools display engine temperature in degrees centigrade. After engine is started, the temperature should rise steadily to about 9O°C (194°F) then stabilize when thermostat opens.