Functioning check, removal and installation of a measuring instrument of a stream of air. BMW the 5th E28/E34 series (from 1981 to 1993 of release)
Repair of BMW E28 and series E34 from 1981 to 1993
1. Cars of the BMW brand of 5-series
2. Engine
3. Cooling system
4. Power supply system
4.1. General information
4.2. Pressure removal in system of injection of fuel
4.3. Check of pressure of fuel / fuel pump
4.4. Removal and installation of the fuel pump, intermediate pump and fuel level sensor
4.5. Repair and replacement of fuel lines and connectors
4.6. Removal and installation of a fuel tank
4.7. General information about cleaning and repair of a fuel tank
4.8. Removal and air purifier installation
4.9. Check, adjustment and replacement of a cable of an accelerator
4.10. General information about the carburetor
4.11. Removal and carburetor installation
4.12. Cleaning and carburetor adjustment
4.13. General information about fuel injection
4.14. Systems of injection of fuel
4.15. Check of functioning of system of injection of fuel
4.16. Functioning check, removal and installation of a measuring instrument of a stream of air
4.17. Functioning check, removal and installation of the case of a throttle
4.18. Check of functioning and replacement of a regulator of pressure of fuel
4.19. Check of functioning and replacement of an injector of cold start and temperature switch
4.20. Check of functioning and replacement of fuel injectors
4.21. Functioning check, adjustment and replacement of the air valve of stabilization of idling
4.22. Search of malfunctions of system of injection of fuel
4.23. Diagnostics of malfunctions of a power supply system
5. Ignition system
6. Control systems of the engine and decrease in toxicity of the fulfilled gases
7. System of production of the fulfilled gases
8. Coupling
9. Manual box of gear shifting (RKPP) and automatic transmission (AT)
10. Transmission line
11. Steering and suspension bracket
12. Brake system
13. Body
14. Control body sizes
15. Heater and air conditioner
16. System of onboard electric equipment
17. Routine maintenance of the car
18. Size table and adjusting data
19. Schematic electric circuits
20. Governing bodies and operation receptions
21. System of onboard diagnostics - a principle of functioning and codes of malfunctions
 








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4.16. Functioning check, removal and installation of a measuring instrument of a stream of air

Check (L-Jetronic systems)

 PERFORMANCE ORDER

  1. Disconnect from the entrance union of a measuring instrument of a stream of air. Carefully open and close a zaslonka of the sensor and check jamming existence. Zaslonka at return flashes can be bent and it to lead to the wrong measurements of resistance. Zaslonka can be bent and remain in partially open situation, causing enrichment of a mix and an engine stop idling.
  1. Disconnect from a measuring instrument of a stream of air the electric socket.
  1. Check an ohmmeter resistance between contacts 7 and 8. Resistance should increase constantly (without “flat sites”) at slow moving of a zaslonka of the sensor from completely closed position in the completely open.
  1. Also check the sensor of temperature of inlet air (in a stream measuring instrument). Check an ohmmeter correctness of resistance between contacts 8 and 9 (look an illustration above). Resistance at 20 ° With should make size from 2200 to 2700 Ohm.
  1. If resistance sizes correct, check cables (look Head System of onboard electric equipment). Attach to a stream measuring instrument the socket. Be convinced that ignition is switched off. Disconnect the socket from ECU (it is located under the dashboard on the right) and check an ohmmeter resistance between contact 7 and 8. Carefully remove from a stream measuring instrument a cover and observe resistance change when moving from a closed position in the completely open. The result of check should be same, as at the previous check. If in results any differences are observed, in a cable there can be breaks or short circuits.

Check of functioning (Motronic system)

 PERFORMANCE ORDER

  1. Be convinced that ignition is switched off. Uncover access to ECU (look Head of the Control system of the engine and decrease in toxicity of the fulfilled gases) and disconnect the cable socket.
  1. Check an ohmmeter resistance between noted contacts of the electric ECU socket and check resistance change when moving petal. On early systems Motronic use contacts 7 and 9.
  1. On late models - contacts 7 and 12.
  1. Resistance should increase continuously (without “flat sites”) when moving a petal of the sensor from completely closed position in the completely open.

Early systems Motronic differ the 35-contact electric socket; in late systems Motronic the 55-contact socket is used.

  1. If resistance size wrong, check a cable.

Removal and installation (all systems)

 PERFORMANCE ORDER

  1. Disconnect from a stream measuring instrument the electric socket.
  2. Remove an air purifier (look the Section Removal and air purifier installation).
  1. Unscrew nuts and take a stream measuring instrument from an impellent compartment or from an air purifier.
 
  1. Installation is return to removal.


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4.17. Functioning check, removal and installation of the case of a throttle