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
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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. |
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3. Disconnect the plug (In 11/4) and unscrew the thermal sensor of cooling liquid. |
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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. |
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Check
| PERFORMANCE ORDER |
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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. |
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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. |
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Thermal sensor resistance
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TEMPERATURE
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RESISTANCE
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20 °C
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2500 Ohm
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30 °C
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1700 Ohm
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40 °C
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1170 Ohm
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50 °C
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830 Ohm
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60 °C
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600 Ohm
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70 °C
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435 Ohm
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80 °C
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325 Ohm
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90 °C
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245 Ohm
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100 °C
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185 Ohm
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