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

1995 Chevrolet S10/T10 P/U 2WD L4-2.2L VIN 4SECTION 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.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • You smell fuel, burning insulation, or see smoke.
  • Brakes feel soft, pull hard to one side, or make grinding noises.
  • The engine overheats, stalls repeatedly, or misfires under load.
  • You are missing required tools, torque specs, or safe lifting equipment.
  • You are not confident in the next step or safety outcome.