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.
Engine Coolant Temperature Sensor 2
The engine coolant temperature sensor is used to detect the radiator-outlet water temperature. The sensor modifies a voltage signal from the ECM. The modified signal returns to the ECM as the radiator-outlet water temperature input. The sensor uses a thermistor which is sensitive to the change in temperature. The electrical resistance of the thermistor decreases as temperature increases.
|
Engine coolant temperature [Β°C (Β°F)] |
Voltage * (V) |
Resistance (kΞ©) |
|
-10 (14) |
4.29-4.50 |
7.0 - 11.4 |
|
20 (68) |
3.48-3.58 |
2.37 - 2.63 |
|
50 (122) |
2.03-2.49 |
0.68 - 1.00 |
|
90 (194) |
0.97-1.04 |
0.236 - 0.260 |
*: These data are reference values and are measured between ECM terminals.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.