E39 series BMW 5

since 1996-2001 of release

Repair and car operation



E39 BMW
+ Introduction
+ Maintenance instruction
+ Current leaving and service
+ Engine
+ Systems of cooling, heating
- Power supply system and release
   + Power supply system
   - System of injection of the petrol engine
      Memory of malfunctions
      Security measures and rules of observance of purity at work with injection system
      Work of system of injection
      Check of systems of ignition and injection
      Adjustment of a drive of gas
      Removal and installation of a branch pipe of a butterfly valve
      Removal, check and installation of the valve of adjustment of idling
      Check, removal and installation of the sensor of temperature
      Check of injectors
      Removal and installation of injectors
   + Power supply system of the diesel engine
   + System of production of the fulfilled gases
+ engine Electric equipment
+ Manual transmission
+ Automatic transmission
+ Coupling and power shafts
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment
+ electric equipment Schemes
+ System of onboard diagnostics


Heavy Metal & Reflected



Work of system of injection

Fuel is sucked in from a fuel tank by an electric gasoline pump and moves via the fuel filter to the distributive highway and further to injectors. The pressure regulator at the distributive highway watches that pressure of fuel made 3.5 bar. Injectors have electric management and inject fuel impulsno into the inlet pipeline in front of inlet valves.

Air is soaked up by the engine via the air filter and passes through a measuring instrument of weight of air. In the case of a measuring instrument there is thin, electricly a warmed-up plate which is cooled with a passable stream of air. The control system changes value of a current of heating so that the temperature of a plate remained a constant.

If, for example, the amount of soaked-up air increases, the plate aspires to be cooled. Thereof value of a current of heating of a plate grows. The control system of the engine determines a stream of air and, therefore, its loading by deviations of a current of heating.

The control unit depending on weight of air and number of turns of the engine defines time of injection and, thus, amount of injected fuel. At longer opening of injectors the amount of injected fuel increases. Additional sensors watch the correct supply of fuel in extreme situations of movement of the car.

Injection of fuel occurs consistently. It means that injectors cope individually, and the sequence of injection corresponds to sequence of ignition. By means of a choice of the moment of injection in relation to the moment of opening of inlet valves it is possible to regulate parameters of the fulfilled gas and engine capacity.

The potentiometer of a butterfly valve is on a zaslonka shaft. It hands over to the control unit information on the provision of a zaslonka. Thanks to it process of compulsory idling since while the zaslonka is closed, in particular, copes and at the same time the number of turns lies above some certain value, the control unit stops supply of fuel to the engine.

The relay of the fuel pump is in the relay block behind the left amortization rack. The relay submits a current to the fuel pump. The safety switch interrupts supply of fuel at the idle engine, for example, if the engine decayed.

The provision of a cranked shaft of the engine and its number of turns are defined by two inductive sensors. The sensor of number of turns is at a pulley of a cranked shaft. The sensor of recognition of the cylinder is in a forward part of the engine in a cover of a box of a chain of a drive of distribution.

Two sensors of oxygen measure the content of oxygen in the fulfilled gases and transmit a signal in the control unit. On the basis of received information the control unit changes a ratio fuel/air that provides optimum reburning of a fuel mix.

The regulator of idling operates amount of air idling bypassing a butterfly valve. It provides maintenance of constant number of turns idling irrespective of connection of additional consumers, such as, the power steering or the cooling compressor.

The electromagnetic valve of ventilation of a fuel tank copes depending on an engine condition. The pairs which were formed in a fuel tank of gasoline accumulate in an adsorber and via the electromagnetic valve move in the combustion chamber. Pairs of gasoline, thus, are effectively used and do not get to the atmosphere.

The control system of a camshaft, in abbreviated form VANOS, turns a shaft of inlet valves by means of pressure of oil in relation to driving appreciate depending on number of turns and engine loading. It allows to receive optimum time of opening of valves concerning comfort of idling, the torque and fuel consumption characteristic. The DME block operates an oil stream to an adjusting element by means of the electromagnetic valve.

Tension control by ignition at too low voltage disconnects the DME block (for example, owing to cable damage). Thus the engine cannot be started. It excludes damages of the catalytic converter.

Communication with other monitors (ABS, ASC, check point management) is carried out through CAN, representing the special tire of data. This system, except other, has that advantage that the plait of cables of the engine contains smaller quantity of cables. Such tire provides higher extent of protection of the car at failure of separate devices.