Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET1995CAMARO V6-204 3.4L VIN S SFIREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSCOOLANT TEMPERATURE SENSOR/SWITCH (FOR COMPUTER)DESCRIPTION AND OPERATION
1995 Chevrolet Camaro V6-204 3.4L VIN S SFI
Coolant Temperature Sensor/Switch (For Computer): Description and Operation
1995 Chevrolet Camaro V6-204 3.4L VIN S SFISECTION Description and Operation
Engine Coolant Temperature (ECT) Sensor:
PURPOSE
The Engine Coolant Temperature (ECT) sensor is a thermistor (a resistor which changes value based on temperature) mounted in the engine coolant stream. Low coolant temperature produces a high resistance (100,000 ohms at -40° C (-40° F) while high temperature causes low resistance (70 ohms at 130° C (266° F).
OPERATION
The Powertrain Control Module (PCM) supplies a 5 volt signal to the ECT sensor through a resistor in the PCM and measures the voltage. The voltage will be high when the engine is cold, and low when the engine is hot. By measuring the voltage, the PCM calculates the engine coolant temperature. Engine coolant temperature affects most systems the PCM controls.
A failure in the ECT sensor circuit should set either a Diagnostic Trouble Code (DTC) 14 or DTC 15. Remember, these DTC(s) indicate a failure in the ECT circuit so proper use of the chart will lead to either repairing a wiring problem or replacing the sensor to properly repair a problem.
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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.