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 MANUALSCHEVROLET1992S10/T10 P/U 4WD V6-173 2.8LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSCOOLANT TEMPERATURE SENSOR/SWITCH (FOR COMPUTER)DESCRIPTION AND OPERATION
1992 Chevrolet S10/T10 P/U 4WD V6-173 2.8L
Coolant Temperature Sensor/Switch (For Computer): Description and Operation
1992 Chevrolet S10/T10 P/U 4WD V6-173 2.8LSECTION Description and Operation
Coolant Temperature Sensor Circuit:
Engine Coolant Temperature Sensor:
PURPOSE
Engine Coolant Temperature (ECT) Sensor is used to control:
- Exhaust Gas Recirculation (EGR)
- Fuel delivery
- Idle Air Control (IAC)
- Ignition Control (IC)
- Torque Converter Clutch (TCC)
OPERATION
The ECT sensor is a thermistor that is located in the engine coolant flow. Low coolant temperature sensor produces a high resistance (100,000 ohms at -40°C/-40°F). High coolant temperature, produces a low resistance (70 ohms at 130°C/266°F).
The ECM sends a 5.0 volt signal to the ECT through a resistor in the control module and measures the voltage. The voltage will be high when the engine is cold and low when the engine is hot. Engine coolant temperature affects most systems controlled by the control module.
The ECM uses information from the ECT to calculate spark advance as follows:
- Cold engine results in more spark advance.
- Hot engine results in less spark advance.
RENDER: 1.0x
NO RELATED
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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.