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.
1994 Geo Metro XFiFACTORY OEM SERVICE PROCEDURE
Engine Coolant Temperature (ECT) Sensor
- A malfunction in the engine coolant temperature sensor circuit will set a related diagnostic trouble code. For testing procedures, see TESTS W/CODES article in this section. An out-of-calibration ECT sensor may not set a diagnostic trouble code. Use following procedure to test sensor calibration.
- Remove engine coolant temperature sensor. Refer to the ENGINE COOLANT TEMPERATURE (ECT) SENSOR LOCATION . Using ohmmeter, measure resistance of engine coolant temperature sensor at designated temperatures. Replace ECT sensor if not within specification. See ENGINE COOLANT TEMPERATURE (ECT) SENSOR RESISTANCE .
ENGINE COOLANT TEMPERATURE (ECT) SENSOR LOCATION
| Application | Location |
|---|---|
| Metro | On Side Of Throttle Body |
ENGINE COOLANT TEMPERATURE (ECT) SENSOR RESISTANCE
| Temperature: °F (°C) | Ohms |
|---|---|
| 0 (-18) | 14,650 |
| 19 (-7) | 8100 |
| 39 (4) | 4780 |
| 70 (21) | 2350 |
| 100 (38) | 1250 |
| 160 (71) | 400 |
| 210 (99) | 190 |
Factory Service Tools
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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.