BMW 5 Series E39

since 1996-2001 release

Repair and operation of the car

+ Introduction
+ Maintenance instruction
+ Current leaving and service
+ Engine
+ Cooling systems, heating
+ Power supply system and release
- Engine electric equipment
   + System of ignition
   + System of preheat of the diesel engine
   + Systems of a charge and start
+ Manual transmission
+ Automatic transmission
+ Coupling and power shafts
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment
+ Schemes of electric equipment
+ System of onboard diagnostics

Engine electric equipment

General information

All components of systems of ignition, start and charge are a part of electric equipment of the engine. In a look of the fact that on the functional purpose these components belong to directly ensuring functioning of the engine they are considered separately from components of onboard electric equipment, such as lighting fixtures, monitors, etc.

During the work with electric equipment it is always necessary to observe certain security measures:
   a) Be careful - electric devices especially easily fail at maloperation with them during check, connection and service.
   b) Do not leave ignition for a long time included at the switched-off engine.
   c) Never disconnect a wire from the battery at the working engine.
   d) At connection of wires from the auxiliary power supply at emergency start of the engine observe polarity.
   e) Always disconnect a negative wire from the battery the first and connect the last in order to avoid short circuit at a casual contact with the tool in time отдавания / tightenings of a clip of the plug.


Separate characteristics are provided also in the text of the Head and in case of obligation of their performance are highlighted in bold type

System of ignition and management of DME

Spark plugs with two electrodes of weight








520i, 523i, 528i

Engine type


Turns of idling, rpm

750 ± 50

Maximum turns, rpm

6500 ± 50

Concentration WITH volume, % before/after
catalytic converter

0.7 ±0.5/0.5 ± 0.3

Resistance at +20 °C (if it is not set differently):


Pulse sensor
turns/situation numbers

1280 ± 128 Ohms

Pulse sensor of recognition of the cylinder


 •  between conclusions 1 and 2

</= 1.0 Ohm

 •  between conclusions 2 and 3

> 10 megohms (infinitely)

Engine temperature sensor


 •  at a temperature
cooling liquid 20 ° ± 3 °C

2.2 - 2.7 kOhm

 •  at a temperature
cooling liquid 80 ° ± 3 °C

2.2 - 2.7 kOhm

The sensor of temperature of the soaked-up air


 •  at air temperature 20 ° ± 3 °C

2.2 - 2.7 kOhm

 •  at air temperature 50 ° ± 3 °C

0.76 - 0.91 kOhm

Ignition coil


 •  primary winding

0.8 ± 0.1 Ohms

 • secondary winding

it is not measured

Spark plug plug

5 kOhm ± 500 Ohms

Rechargeable battery


12 V, negative weight



 • 520i, 523i, 528i

70 Ач

 • 535i, 540i, 525tds

90 Ач

Charging degree  

 • it is completely discharged, density

1.15, 16 °va

 • polurazryazhena, density

1.22, 24 °va

 • it is completely loaded, density

1.26, 30 °va

Electrolyte density in all banks has to
to be identical, the maximum difference

no more than 0.04 g/ml

Lubricant for battery plugs

Bosch Ft 40 v 1

Battery brelka of remote control







Current, And

80 (бенз.), 110 (диз.)




Power, kW


Efforts of tightening of threaded connections

The moments of an inhaling of fixture are given in the text of the Head and on some illyustratsiyakh*.
* The moments of an inhaling highlighted in the text in bold type are subject to exact observance; the efforts which are not highlighted in bold type are given only approximately



Spark plugs

25 Nanometer