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






7.5.1.5. The thermal sensor of the soaked-up air

GENERAL INFORMATION

The thermal sensor takes temperature of the soaked-up air. This size together with a signal of the sensor of pressure of the inlet gas pipeline serves as a measure of amount of the soaked-up air for the actuation device. The thermal sensor of the soaked-up air is the NTC resistor (NTC = negative temperature coefficient) which resistance decreases at temperature increase.

2,2 / 2,5 L ENGINE

Removal


PERFORMANCE ORDER
Remove the thermal sensor together with the plug (B17x1), for this purpose squeeze both side fixing a clip (1).

Check

PERFORMANCE ORDER
1. Disconnect the plug.
2. Check an ohmmeter thermal sensor resistance at various temperatures. 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. Spread the cable plug (socket).
2. Check a sealing ring of a round profile for defects or porosity, if necessary replace it.
3. Insert the thermal sensor together with a sealing ring of a round profile.
4. Squeeze out the fixing clips outside until it distinctly (aurally) is recorded.

Thermal sensor resistance

TEMPERATURE
RESISTANCE
20 °C
9670 Ohm
30 °C
6060 Ohm
40 °C
3900 Ohm
50 °C
2600 Ohm
60 °C
1760 Ohm
70 °C
1220 Ohm
80 °C
860 Ohm
90 °C
620 Ohm
100 °C
185 Ohm