Audi 80/90/Coupe

since 1986-1991 release

Repair and operation of the car

Audi 80/90/Coupe
+ 1.2. Identification of the car
- 2. Engines, carburetors
   2.1.2. Removal and installation of the engine (5-cylinder models)
   2.1.3. Dismantling and assembly of engines
   2.1.4. Head of the block of cylinders, gas distribution mechanism
   + 2.2. Engine electric equipment
   - 2.3. Carburetors
      - Check and adjustment of the carburetor Check of turns of idling Check and adjustment of maintenance of CO Bystry check of functioning of the carburetor Check of the probe Lambda Check of the sensor of temperature of cooling liquid Check of an air diaphragm Check of a potentiometer of a throttle Preset values of the carburetor 2EE
      + 2.3.2. Keihin carburetors
3. Lubrication system
+ 4. Cooling system
+ 5. Fuel system
+ 6. Exhaust system
+ 7. System of ignition
+ 8. Transmission
+ 9. Suspension brackets, wheels
+ 10. Brake system
+ 11. Steering
+ 12. Body, salon
+ 13. Air conditioning system
+ 14. Electric equipment Check of the sensor of temperature of cooling liquid


The sensor of temperature informs the equipment of management on engine temperature. Depending on this temperature the regulator of a diaphragm establishes its situation. In case of damage of the sensor of temperature there can be difficulties at start of the engine at a low temperature as the diaphragm will not be completely closed.

1) remove a plug from the sensor of temperature and measure its resistance. At a temperature of +20 °C it has to equal 2000–3000 Ohms
2) connect a plug to temperature sensor, start the engine and warm up it up to the normal working temperature
3) kill the engine, repeat measurement of resistance which at a temperature of +90 °C has to equal 200–300 Ohms

Changes of resistance depending on temperature are presented on graphics.

Sensor resistance
It is in details possible to make check of the sensor of temperature, placing it in a vessel with water and gradually warming up it. At the time of heating of water up to the corresponding temperature, measure sensor resistance.

In case of difference in the measured sizes, it is necessary to replace temperature sensor.