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
- 8. Fuel system
   + 8.1.1. Introduction
   - 8.2. System of injection of petrol engines Principle of work of PMS Principle of work of HFM
      8.2.2. Self-diagnosing of a condition of system of ignition and fuel injection
      8.2.3. Air flowmeter
      8.2.4. A temperature-sensitive element of cooling liquid
      8.2.5. The sensor of soaked-up air
      8.2.6. System of vacuum pipelines
      8.2.7. The fuel distributor with klapanny nozzles
      8.2.8. Klapannye of a nozzle
      8.2.9. Oxygen sensor (lambda probe)
      8.2.10. Diagnostics of malfunctions of system of injection of gasoline
      8.2.11. That it is necessary to know to the owner of the car with the injector engine
      8.2.12. Turbo doctor
   + 8.3. System of injection and food of diesel engines
   + 8.4. System of production of exhaust gases
+ 9. Transmission
+ 10. Running gear
+ 11. Steering
+ 12. Brake system
+ 13. Body
+ 14. Electric equipment
+ 14.2. Electroschemes

b47c026d b47c026d

8.2.5. The sensor of soaked-up air


The temperature-sensitive element takes temperature of soaked-up air. This size together with a signal of the sensor of pressure of the inlet gas pipeline (PMS management system) serves as criterion of an assessment of amount of let-in air. Tremodatchik of soaked-up air is the NTC resistor (NTC – negative temperature factor) which resistance decreases at temperature increase.

The temperature-sensitive element is located on the left side of a cross-section pipe of the air filter.


Remove a temperature-sensitive element together with the shtekkerny socket, for this purpose compress both brackets (arrow).


1. Remove the shtekkerny socket.
2. Suspend a temperature-sensitive element in a water bath and slowly heat up it.
3. Check an ohmmeter resistance of a temperature-sensitive element. The measured value is considered normal if it is in the admission of 5 % (see the table Resistance of a temperature-sensitive element).
4. If at measurements the temperature-sensitive element does not reach preset values, it is necessary to replace it.


1. Get the shtekkerny socket of a wire.
2. Check on absence of damages and porosity a sealing ring of round section.
3. Insert a temperature-sensitive element with a sealing ring. Squeeze out outside of a bracket until they will not be fixed with click.

Resistance of a temperature-sensitive element

+10 ° With
apprx. 9670 Ohm
+20 ° With
apprx. 6060 Ohm
+30 ° With
apprx. 3900 Ohm
+40 ° With
apprx. 2600 Ohm
+50 ° With
apprx. 1760 Ohm
+60 ° With
apprx. 1220 Ohm
+70 ° With
apprx. 860 Ohm
+80 ° With
apprx. 620 Ohm