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
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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. |
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3. Disconnect the tip (In 11/4) and unscrew a temperature-sensitive element of cooling liquid. |
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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. |
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Check
| PERFORMANCE ORDER |
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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. |
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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. |
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Resistance of a temperature-sensitive element
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TEMPERATURE
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RESISTANCE
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20 ° With
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2500 Ohm
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30 ° With
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1700 Ohm
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40 ° With
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1170 Ohm
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50 ° With
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830 Ohm
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60 ° With
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600 Ohm
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70 ° With
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435 Ohm
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80 ° With
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325 Ohm
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90 ° With
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245 Ohm
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100 ° With
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185 Ohm
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