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 MANUALSSATURN2000LS2 V6-3.0L VIN RREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSCOOLANT TEMPERATURE SENSOR/SWITCH (FOR COMPUTER)DESCRIPTION AND OPERATION
2000 Saturn LS2 V6-3.0L VIN R
Coolant Temperature Sensor/Switch (For Computer): Description and Operation
2000 Saturn LS2 V6-3.0L VIN RSECTION Description and Operation
The Engine Coolant Temperature (ECT) sensor is a thermistor which changes resistance to reflect changes in temperature. When the ambient temperature is low, the resistance of the ECT is high. When the ambient temperature is high, the resistance of the ECT is low. The ECT has a signal circuit and a ground circuit. The ECM supplies 5 V to the signal line which is pulled-up through a pull-up resistor. The signal voltage is monitored for changes in sensor resistance in order to determine engine coolant temperature.
The ECT signal is used by the ECM for fuel control, ignition timing, EGR operation, EVAP canister purge control, and closed loop fuel operation.
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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.