E39 series BMW 5

since 1996-2001 of release

Repair and car operation

System of onboard diagnostics

Data on diagnostic devices

Use at diagnostics of considered systems of a digital multimeter with a high impedance essentially increases accuracy of made measurements

Recently, at diagnostics of control systems by the engine of modern cars such reading-out devices, as manual scanners of type, for example, Actron Scantool, AutoXray XP240, or KTS 100 (Bosch) became absolutely irreplaceable

Check of serviceability of functioning of components of systems of injection and decrease in toxicity of the fulfilled gases is made by means of a universal digital measuring instrument (multimeter) (see an accompanying illustration). 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 (internal resistance of the device makes 10 megohms). 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 B), however there is defining at diagnostics of elements giving out low-voltage signals, such, as, for example, a l-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, 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 BMW DIS, MoDIC testers can be applied to diagnostics of electronic systems of the engine, automatic transmission, ABS, SRS (programmed from PC). Besides, it is possible to apply scanners and specialized diagnostic analyzers to this purpose, for example CS 1000, Bosch FSA 560 (www.bosch.de), KTS 300, Sun 2013, or the ordinary personal computer with a special cable and the program OBD browser (for example, address on a site www.carsoftinternational.com/).

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 are put), to program anticreeping system, to observe signals in car chains in real time.

For diagnostics of your car you can download the free version of a browser of OBD II from our site arus.spb.ru or on www.obd-2.com; www.obd-2.de

Reading written down in memory of system of self-diagnostics of codes of malfunctions on some models can be made also on the indicator “check the engine” on a control panel.

The scanner only reads out the malfunctions brought memory and clears memory of malfunctions. The tester in addition can make active and show the current data.

Firm ToolRama, Inc devices also can be applied to diagnostics, for example. (3500 NW Boca Raton Blvd., Boca Raton, Florida, 33431, USA 1 877 866 5726-561 750 4511-561 338 8447 FAX) with cartridges for a certain model of the car.

All cartridges for a tester can be used and in the scanner. Thus functions will be limited only to reading and memory cleaning.

Firm ToolRama, Inc devices can be applied to diagnostics, for example. (3500 NW Boca Raton Blvd., Boca Raton, Florida, 33431, USA 1 877 866 5726-561 750 4511-561 338 8447 FAX):
   -  R000 tester with cartridge Т051D or the P000 scanner with cartridge Т041,
   -  universal cable of N000,
   -  N001 socket.

The cartridge of OBD II carries out the following functions:
   -  Reading and removal of codes of malfunctions of OBD II. Reflection of results of tests of the sensor of oxygen.
   -  Continuous control of systems of ignition, injection and components.
   -  Reflection of the list of the current data and the fixed unstable refusals:
      •  Absolute pressure in the inlet pipeline;
      •  Tension of the sensor of oxygen;
      •  Temperature of cooling liquid of the engine;
      •  Settlement loading of the engine;
      •  Speed of the car;
      •  Quality of fuel;
      •  A consumption of air (on weight);
      •  Ignition advancing;
      •  Provision of a butterfly valve;
      •  Temperature of soaked-up air.

About devices you can get acquainted with details on sites www.programatools.com, www.bosch.de.

The diagnostic 16-contact socket (X19527) of system of onboard diagnostics of OBD II is located on the central console

The ISO 9141-2 protocol is used.
The standard cable is applied to connection with the J1962 socket.