BMW 7_aya the E38 series from 1994 to 2002
1. Introduction
2. Governing bodies and methods of operation
3. Settings and routine maintenance of the car
4. Engine
5. Cooling systems 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 of the engine
7.1.4. Replacement of candles and coils of ignition
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 of the engine
7.2. Systems of a charge and start
8. Manual box of gear shifting and coupling
9. Automatic transmission
10. Cardan and power shafts, reducer, differential and stupichny assemblies
11. Brake system
12. Suspension bracket and steering
13. Body
14. Onboard electric equipment
15. Schemes of electric equipment



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7.1. Systems of ignition, preheat and engine management

Main data and security measures

The system of ignition provides ignition of the air-fuel mix given to combustion chambers of cylinders of petrol engines. For formation of a spark of the required intensity the 12-volt tension of onboard network will be transformed in ignition coils to high-voltage tension.

The electronic system of ignition is an integral part of a control system of the engine. Its main working components are candles, coils and modules of ignition, and on M73 engines – ignition distributors. On engines, except M73 distribution of giving In/in tension on spark plugs the block of electronic control operates the engine (ECM).

Manual adjustment of the moment of ignition is not made, – at violation of the required installations it is necessary to make replacement of the failed components.

Components of system of ignition are not subject to wear and do not need regular service. According to the schedule of maintenance (see the Head Nastroyki and routine maintenance of the car) it is necessary to make only replacement of spark plugs.

The system of preheat of diesel engines is intended for preliminary warming up of combustion chambers for the purpose of sure ignition of diesel fuel. As heating elements glow plugs which work the corresponding electronic block operates are used.

The main data on work and sensors of control systems of the engine and injection of fuel are stated in the Head of the Power supply system and production of the fulfilled gases.

Security measures during the work with systems of ignition and management of fuel injection

For the purpose of prevention of traumatizing and/or failure of components of electric and electronic systems it is necessary to observe the following:

  • Do not touch an electrical wiring of system of ignition and do not separate its sockets at the working engine / the rotating starter;
  • You make detachment/connection of fuel-supply lines of a control system of injection, an electrical wiring of system of ignition, and also any diagnostic and measuring equipment only at the switched-off ignition;
  • Performance of work on service by electronic system of ignition by people with the implanted pacemaker is not allowed;

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7. Systems of electric equipment of the engine
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7.1.1. Main data and security measures