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
FUNCTIONS WITHIN THE SYSTEM
ECM receives the engine coolant temperature signal from the engine coolant temperature sensor and performs various control.
INDIVIDUAL FUNCTION WITHIN THE SYSTEM
The engine coolant temperature sensor is used to detect the engine coolant temperature.
INDIVIDUAL OPERATION
The engine coolant temperature sensor uses a thermistor which is sensitive to the change in temperature. The electrical resistance of the thermistor decreases as temperature increases.
| Temperature [°C (°F)] | Voltage* (V) | Resistance (kΩ) |
|---|---|---|
| -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.
COMPONENT LOCATION
Engine Coolant Temperature Sensor 1
The engine coolant temperature sensor is installed to the multi-way control valve.
Engine Coolant Temperature Sensor 2
The engine coolant temperature sensor is installed to the radiator.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
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.