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.
2000 Pontiac Firefly (CANADA) L3-1.0LFACTORY OEM SERVICE PROCEDURE
ECT Sensor Replacement
REMOVAL PROCEDURE
NOTE: Use care when handling the coolant sensor. Damage to the coolant sensor will affect the operation of the fuel control system.
1. Drain the engine coolant system. Refer to Draining and Filling Cooling System the Engine Cooling.
2. Disconnect the ECT sensor electrical connector.
3. Remove the ECT sensor from the thermostat housing.
INSTALLATION PROCEDURE
NOTE: Refer to Component Tightening Notice in Service Precautions.
1. Install the ECT sensor to the thermostat housing.
Tighten
Tighten the ECT sensor to 10 to 20 N.m (7.5 to 14 lb ft).
2. Connect the ECT sensor electrical connector.
3. Fill the engine coolant system to the proper level. Refer Draining and Filling Cooling System to Engine Cooling.
Factory Service Tools
Use the Manual With the Right Hardware
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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.