Motronic, L-/LE-/LU-Jetronic
The temperature sensor measures the engine temperature and transmits this information to the control unit. The temperature sensor contains an NTC element (NTC - negative temperature coefficient), the resistance of which decreases with increasing temperature.
Removal
Note: To prevent coolant from leaking out when removing the sensor, drain some of the coolant into a container.
Remove the temperature sensor connector.
Unscrew the temperature sensor.
Bring the sensor temperature to the appropriate control value. To do this, either place the sensor in the refrigerator or heat it in a water bath. When the specified temperature is reached, remove the sensor and measure the resistance between its contacts.
At a temperature of -10°C the resistance should be 8.2-10.5 kOhm; at a temperature of 20°C - 2.2-2.7 kOhm; and at a temperature of 80°C — 300-360 0m. If there are deviations from the specified values, replace the temperature sensor.
Installation
Install the temperature sensor with a new gasket and tighten to 15 Nm.
Caution: Do not overtighten the temperature sensor.
Connect the connector.
Fill with coolant (see section "Replacing the coolant").
Remove air from the cooling system.
Make a test drive and check the tightness of the temperature sensor installation location; tighten it a little if necessary.