Replacing the coolant temperature sensor (Kalina 1118)

Coolant temperature sensor (coolant temperature sensor) is a thermistor (a resistor whose resistance changes with temperature). On the vehicle, the coolant temperature sensor is screwed into the thermostat housing and connected to the controller input, which is connected to an internal 5 V source through a 2 kOhm resistor. At low temperatures, the resistance of the coolant temperature sensor is high, and at high temperatures, it is low (Table 9.5).

The controller calculates the coolant temperature based on the voltage drop across the coolant temperature sensor. When the engine is cold, the voltage drop is high, and when the engine is warm, it is low. Coolant temperature affects most of the characteristics that the controller controls.

To replace the coolant temperature sensor on a car (coolant temperature sensor) you will need a 19 key.

1. Disconnect the wire from the negative terminal of the battery.

2. Partially drain the coolant from the radiator.

3. For ease of operation, remove the air filter (see "Removal and installation the air filter").



4. After squeezing the plastic clamp, disconnect the wire harness connector from the coolant temperature sensor...





5. ...and unscrew the coolant temperature sensor from the thermostat housing.



6. Use an ohmmeter to measure the resistance at different temperature conditions (see table 9.5). 7. Install the coolant temperature sensor on the vehicle (coolant temperature sensor) in the reverse order of removal.

Table 9.5. Dependence of coolant temperature sensor resistance (coolant temperature sensor) from temperature

Temperature,°C	Resistance, Ohm
-40 -20 -10 0 +5 +10 +15 +20 +25 +35 +45 +60 +80 +100	100 700 28 680 16 180 9420 7280 5670 4450 3520 2796 1802 1188 667 332 177