Mercedes of the S-class W202

1993-2000 of release

Repair and operation of the car

Mercedes W202
+ 1.2. General information
+ 2. Maintenance
+ 3. Engines
+ 4. Lubrication system
+ 5. Cooling system
+ 6. Heating, ventilation
- 7. System of ignition
   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 the diesel
      - 7.5.1. Check of the device of a preliminary warming up
         7.5.1.1. Glow lamp
         7.5.1.2. Anchor
         7.5.1.3. Glow plugs
         7.5.1.4. Temperature sensor of cooling liquid
         7.5.1.5. The thermal sensor of the soaked-up air
      7.5.2. Self-diagnostics of the device
+ 8. Fuel system
+ 9. Transmission
+ 10. Running gear
+ 11. Steering
+ 12. Brake system
+ 13. Body
+ 14. Electric equipment
+ 14.2. Electrical circuitries

7.5.1.4. Temperature sensor of cooling liquid

GENERAL INFORMATION

The temperature sensor takes temperature to cooling liquid and transmits the corresponding signals to the actuation device. The sensor contains a NTC element (NTC – negative temperature coefficient) which reduces the resistance with temperature increase. At the faulty sensor the actuation device gives reserve size. It leads to the fact that duration of a preliminary and subsequent warming up is incorrectly maintained.

PERFORMANCE ORDER

1. Engine of 2,0 l: remove the 6-shtyrkovy plug from the relay of management of a warming up and measure resistance between a counter 6 on the plug and the case (the block of cylinders of the engine). If resistance strives for infinity, in the conducting line break. If resistance is below 1 Ohm, then in the electric line short circuit.
Preset value:
at a temperature of 25 °C: 2442 Ohms + 170 Ohms
at a temperature of 80 °C: 291 Ohm + 16 Ohms.

2. L engine 2,2 / 2,5: reduce pressure of cooling liquid. For this purpose uncover the compensation tank filled with cooling liquid.

3. Disconnect the plug (In 11/4) and unscrew the thermal sensor of cooling liquid.

4. Disconnect the plug (In 11/8х1) and unscrew "the thermal sensor of cooling liquid for the subsequent warming up" on a head of the block of cylinders.

Check

PERFORMANCE ORDER

1. Suspend the thermal sensor in a water bath and slowly heat it.

2. Check an ohmmeter thermal sensor resistance. The measured size as it should be if it is in admission limits + 5% (see the table Thermal Sensor Resistance).

3. If at measurements the thermal sensor does not reach preset values, then it should be replaced.

Installation

PERFORMANCE ORDER

1. Screw in the thermal sensor with m 20 N.' moment.

2. Spread the cable plug (socket).

3. Fill in cooling liquid.

4. Warm up the engine and check the level of cooling liquid.

Thermal sensor resistance

TEMPERATURE

RESISTANCE

20 °C

2500 Ohm

30 °C

1700 Ohm

40 °C

1170 Ohm

50 °C

830 Ohm

60 °C

600 Ohm

70 °C

435 Ohm

80 °C

325 Ohm

90 °C

245 Ohm

100 °C

185 Ohm

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