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
         7.5.1.1. Filament lamp
         7.5.1.2. Anchor
         7.5.1.3. Glow plugs
         7.5.1.4. The temperature sensor of cooling liquid
         7.5.1.5. 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


7.5.1.4. The temperature sensor of cooling liquid

GENERAL INFORMATION

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.
PERFORMANCE ORDER
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.

Check

PERFORMANCE ORDER
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.

Installation

PERFORMANCE ORDER
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

TEMPERATURE
RESISTANCE
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