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 MANUALSCHEVROLET1994LUMINA V6-204 3.4L DOHCREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSCOOLANT TEMPERATURE SENSOR/SWITCH (FOR COMPUTER)DESCRIPTION AND OPERATION
1994 Chevrolet Lumina V6-204 3.4L DOHC
Coolant Temperature Sensor/Switch (For Computer): Description and Operation
1994 Chevrolet Lumina V6-204 3.4L DOHCSECTION Description and Operation
Engine Coolant Temperature Sensor:
PURPOSE
The engine Coolant Temperature Sensor (CTS) provides engine temperature information to the control. The control unit uses this information to determine open-loop/closed loop operation, and make temperature related adjustments to the fuel, ignition and emission control systems.
OPERATION
The Sensor is a thermistor, installed where it protrudes into the engine coolant flow. Its resistance varies with changing temperature. At low temperatures its resistance is high. At high temperatures, its resistance is low. The ECM/PCM sends a 5.0 volt reference signal to sensor through a resistor in the computer, and then monitors the voltage in the circuit. The measured voltage varies with changes in coolant temperature, due to the changing resistance of the sensor. Each measured voltage value corresponds to a specific coolant temperature. By monitoring the circuit voltage, the computer can calculate the engine temperature and make necessary adjustments.
RENDER: 1.0x
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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.