BMW 7_ая the E38 series from 1994 to 2002
1. Introduction
2. Governing bodies and operation receptions
3. Settings and routine maintenance of the car
4. Engine
5. Systems of cooling of the engine, heating, ventilation and air conditioning
6. A power supply system and production of the fulfilled gases
7. Systems of electric equipment of the engine
7.1. Systems of ignition, preheat and engine management
7.1.1. Main data and security measures
7.1.2. Search of malfunctions - the general information and preliminary checks
7.1.3. Diagnostics of a control system by the engine
7.1.4. Replacement of candles and ignition coils
7.1.5. Replacement of rotors of distributors of ignition
7.1.6. Replacement of candles of an incandescence
7.1.7. Removal and ECM installation
7.1.8. Replacement of sensors of a control system with the engine
7.2. Charge and start systems
8. Manual box of gear shifting and coupling
9. Automatic transmission
10. Kardanny and power shafts, reducer, differential and stupichny assemblies
11. Brake system
12. Suspension bracket and steering
13. Body
14. Onboard electric equipment
15. Electric equipment schemes



7.1.3. Diagnostics of a control system by the engine

System of onboard self-diagnostics (OBD)

Models are equipped with system of onboard diagnostics of the second generation (OBD II).

Data read-out of OBD II system is made by means of the special scanner, for example, Consult-II connected to the 16-contact diagnostic socket (DLC) by means of a cable of a special cable with an adapter. By means of the same scanner cleaning of memory of the processor is carried out also. Performance of procedures of reading of the DTC codes and cleaning of memory of ECM will be reasonable to charge to experts HUNDRED.

Data on diagnostic devices

Check of serviceability of functioning of components of systems of injection and decrease in toxicity of OG is made by means of a universal digital measuring instrument (multimeter). Use of a digital measuring instrument preferably for several reasons. First, on analog devices it is rather difficult (sometimes - it is impossible), to define result of the indication to within the 100-th and thousand shares while at inspection of the contours including in the structure electronic components, such accuracy takes on special significance. The second, the reason that fact is not less important that the internal contour of a digital multimeter, has rather high impedance. As the voltmeter is connected to a checked chain in parallel, accuracy of measurement by that is higher, than the smaller current will pass through actually device. This factor is not essential at measurement of rather high values of tension (9 ÷ 12 In), however there is defining at diagnostics of elements giving out low-voltage signals, such, as, for example, a lambda probe where it is a question of measurement of shares of volt.

Parallel supervision of parameters of signals, resistance and tension in all chains of management is possible by means of a splitter included consistently in the socket of the control unit by the engine. Thus on the switched-off or working engine, or during car movement, measurement of parameters of signals on splitter plugs from what the conclusion about possible defects is drawn is made.

Special diagnostic scanners or testers can be applied to diagnostics of electronic systems of the car with a certain cartridge (if it is provided), a universal cable and the socket. Besides, it is possible to apply the specialized automobile diagnostic computer which has been specially developed for complete diagnostics of the majority of systems of modern cars to this purpose (for example, Launch HiTech firm ADC2000). Also, it is possible to apply scanners and specialized diagnostic analyzers to this purpose, for example, FDS 2000, Bosch FSA 560 (, KTS500 (0 684 400 500) or the ordinary personal computer with the special adapter, a cable (for example, a set 1 687 001 439) and the established program the OBD II browser.

The free version of the OBD II browser can be "downloaded" also from a site of originators of the real Management

Some scanners, besides usual operations of diagnostics, allow, at connection with the personal computer, to unpack being stored in memory of the control unit schematic diagrams of electric equipment (if those are put), to program anticreeping system, to observe signals in car chains in real time.

«previous page
7.1.2. Search of malfunctions - the general information and preliminary checks
following page»
7.1.4. Replacement of candles and ignition coils