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 Diagnostic Trouble Code Charts. Under Computer and Controls/System Diagnosis/Procedures. Testing and Inspection

Most scan tools display engine temperature in degrees centigrade. After engine is started, the temperature should rise steadily to about 90°C (194°F) then stabilize when thermostat opens.