Diagnostics of malfunctions of automatic transmission. 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
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)
9.1. Manual box of gear shifting (RKPP)
9.2. Automatic transmission (AT)
9.2.1. General information
9.2.2. General information about diagnostics of malfunctions
9.2.3. Adjustment of a drive of the lever of the selector
9.2.4. Adjustment of a cable of a drive of a butterfly valve
9.2.5. Check of work and replacement of the switch of permission of the start / switch of fires of a backing
9.2.6. Removal and installation of automatic transmission
9.2.7. Replacement of epiploons
9.2.8. Diagnostics of malfunctions of automatic transmission
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


9.2.8. Diagnostics of malfunctions of automatic transmission

In view of complexity of a design of AT to the average amateur mechanic will be inconveniently enough exact to carry out diagnostics of its refusals and regenerative repair. In case of problems, excellent from listed below, the owner of the car should address for the help to experts of a workshop of car-care center. It is not necessary to hurry also with demontazhy faulty transmission so the cook its many checks are made by in situ (on a regular place).

Symptom Possible reason
Leakages of ATF ATF usually has dark red color. It is not necessary to confuse traces of its leaks to those from impellent oil - the last can communicate on a case of transmission by a running stream of air.
For identification of a source of leak first of all it is necessary to clear a case of transmission and surfaces surrounding it of dirt and greasing - use a qualitative obezzhirivatel or execute steam cleaning of the unit. Make on the car a short trip with low speed of movement (that traces of leak did not communicate far from its source). To Poddomkratta the car also establish it on props. Examine a transmission case, visually revealing sources of leakage of ATF. Most often as those act:
a) The pallet of a case of transmission (see. Heads Routine maintenance of the car and Automatic transmission (AT));
b) A tube of a jellied mouth of ATF (see. Head Automatic transmission (AT);
c) Tubes of connection of transmission with a cooler of ATF and their unions (see. Head Automatic transmission (AT));
d) The speedometer sensor (see. Head Automatic transmission (AT)).
ATF gains brown color or smells as ashes ATF burned slightly and needs replacement. The probability of internal defects of transmission (is not excluded see. Heads Routine maintenance of the car and Automatic transmission (AT)).
There is no automatic switching of transmission on a low gear (Kick-Down mode) at complete squeezing of a pedal of gas Adjustment of a driving cable of inclusion of the Kick-Down mode (is broken see. Head Automatic transmission (AT)).
Common problems with a choice of transfers take place In Head Automatic transmission (AT) procedures of check and adjustment of draft of gear shifting of AT are described. Most common problems which can appear connected with violation of adjustment of draft below are listed:

a) The engine is started in situation, distinct from "R" or "N";

b) The provision of transmission highlighted on the display panel differs from the actually chosen;

с) The car is actuated at the transmission established in the situation "R"; Procedure of adjustment of draft of switching is described in Head Automatic transmission (AT).

Transmission "comes off" the chosen situation, is switched hardly or with noise, or does not provide car progress forward or back There is a set of the possible reasons of the listed refusals, however one of them gets to the sphere of competence of the average amateur mechanic - violation of level of ATF only. Check, in case of need make having added / liquid replacement (see. Head Routine maintenance of the car). In all other cases the car should be driven away for diagnostics and regenerative transmission repairs/replacements in a car-care center workshop

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9.2.7. Replacement of epiploons
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10. Transmission line