S-class W202 Mercedes

1993-2000 of release

Repair and car operation

W202 Mercedes
+ 1.2. General information
+ 2. Maintenance
+ 3. Engines
+ 4. Greasing system
+ 5. Cooling system
+ 6. Heating, ventilation
- 7. Ignition system
   7.2. Safety measures at repair of electronic system of ignition
   7.3. Ignition coils
   + 7.4. Spark plugs
   - 7.5. Device of a preliminary warming up of a diesel engine
      - 7.5.1. Check of the device of a preliminary warming up Filament lamp Anchor Glow plugs The temperature sensor of cooling liquid A temperature-sensitive element of soaked-up air
      7.5.2. Device self-diagnostics
+ 8. Fuel system
+ 9. Transmission
+ 10. Running gear
+ 11. Steering
+ 12. Brake system
+ 13. Body
+ 14. Electric equipment
+ 14.2. Electroschemes

b47c026d b47c026d The temperature sensor of cooling liquid


The temperature sensor takes temperature of cooling liquid and transmits the corresponding signals on the actuation device. The sensor contains a NTC element (NTC – negative temperature factor) which reduces the resistance with temperature increase. At the faulty sensor the actuation device gives out reserve size. It leads to that duration of a preliminary and subsequent warming up is incorrectly maintained.
1. Engine of 2,0 l: remove 6-штырьковый the tip from the relay of management of a warming up and measure resistance between a counter 6 on the tip and the case (the block of cylinders of the engine). If resistance aspires to infinity, in the current-carrying line break. If resistance is lower 1 Ohm, in the electric line short circuit.
Preset value:
at temperature 25 ° C: 2442 Ohm + 170 Ohm
at temperature 80 ° C: 291 Ohm + 16 Ohm.
2. Engine of 2,2/2,5 l: reduce pressure of cooling liquid. For this purpose uncover the compensatory tank filled with cooling liquid.
3. Disconnect the tip (In 11/4) and unscrew a temperature-sensitive element of cooling liquid.
4. Disconnect the tip (In 11/8х1) and unscrew "a temperature-sensitive element of cooling liquid for the subsequent warming up" on a head of the block of cylinders.


1. Suspend in a water bath a temperature-sensitive element and slowly it heat up.
2. Check an ohmmeter resistance of a temperature-sensitive element. The measured size as it should be if it is in admission limits + 5 % (see the table Resistance of a temperature-sensitive element).
3. If at measurements the temperature-sensitive element does not reach preset values, it is necessary to replace it.


1. Screw in a temperature-sensitive element with the moment of 20 N of m.
2. Get the cable tip (socket).
3. Fill in cooling liquid.
4. Warm up the engine and check level of cooling liquid.

Resistance of a temperature-sensitive element

20 ° With
2500 Ohm
30 ° With
1700 Ohm
40 ° With
1170 Ohm
50 ° With
830 Ohm
60 ° With
600 Ohm
70 ° With
435 Ohm
80 ° With
325 Ohm
90 ° With
245 Ohm
100 ° With
185 Ohm