Saab 9-5

Since 1997 of release

Repair and car operation


Saab 9-5
+ Cars Saab 9-5
+ Controls and operation receptions
+ Options and car routine maintenance
+ The engine
+ Systems of cooling of the engine, heating, ventilation and air conditioning
+ The power supply system and release of the fulfilled gases
- Systems of an electric equipment of the engine
   + Systems of ignition, preheat and engine management
   - Diagnostics of systems of electronic control and the diagnostic equipment
      The general information
      Application of an oscillograph for supervision of signals in chains of control systems
   + Charge and start systems
+ Manual box of a gear change
+ Automatic transmission
+ Coupling and power shafts
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment

Diagnostics of systems of electronic control and the diagnostic equipment

The general information

Tyres of the data and system of onboard self-diagnostics (OBD)

All blocks of management, their gauges and actuation mechanisms (except blocks ABS, adjustment of an inclination of headlights and an additional heater of diesel models) are united in the uniform system consisting of two tyres of data transmission: the P-tyre (the tyre of the data of the power unit) and the I-tyre (the tyre of the given devices). Both tyres are connected to a combination of devices (MIU) and the data of any block of management is accessible to all other blocks. On models without systems TC or ESP the data about speed of the car (from block ABS) moves directly to MIU and also are accessible to all systems of the car. On other models the data about speed of the car arrives either from block TC/ABS, or from block ESP, connected to the P-tyre.

The organisation of the tyre of the data

1 — ECM
2 — TCM
3 — TC/ABS
4 — the P-tyre
5 — MIU
6 — the I-tyre
7 — SID
9 — TWICE
10 — the Main block of an audiosystem

11 — CD-changer
12 — Memory of an e/drive of seats
13 — Memory of an e/drive of external mirrors
14 — DICE
15 — the Gauge of an angle of rotation of a steering wheel
16 — SRS
17 — ESP
18 — the Help at a parking


Contacts of socket DLC №3

4— Connection with the case
5— The Case - an alarm conclusion

7 — Line K of the diagnostic data (ISO 9141-2)
16 — Pressure of the battery through a safety lock (at any position of the lock of ignition)

Models described in the present Management are equipped by system of onboard diagnostics of the second generation (OBD II), for access to which the block of electronic control by the panel of devices (DICE), connected to the I-tyre is used.

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

Used for communication with the scanner the diagnostic socket is organised according to standard ISO 9141-2.

Data on diagnostic devices

Check of serviceability of functioning of components of systems of injection and decrease in toxicity ОГ is made by means of a universal digital measuring instrument (multimeter). Use of a digital measuring instrument preferably for the several reasons. First, on analogue devices it is difficult enough (at times - 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 high enough impedance. As the voltmeter is connected to a checked chain in parallel, accuracy of measurement by that above, than the smaller current will pass through actually device. The given factor is not essential at measurement concerning high values of pressure (9 - 12), however there is defining at diagnostics of elements giving out low-voltage signals, such, as, for example, a ljambda-probe where it is a question of measurement of shares of volt.

Parallel supervision of parametres of signals, resistance and pressure in all chains of management is possible by means of a splitter included consistently in a socket of the block of engine management. Thus on the switched off or working engine, or during car movement, measurement of parametres of signals on splitter plugs from what the conclusion about possible defects becomes 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 a socket. Besides, it is possible to apply the specialised automobile diagnostic computer specially developed for full diagnostics of the majority of systems of modern cars to this purpose (for example, ADC2000 firms Launch HiTech). Also, it is possible to apply scanners and specialised diagnostic analyzers to this purpose, for example, FDS 2000, Bosch FSA 560 (www.bosch.de), KTS500 (0 684 400 500) or the usual personal computer with the special adapter, a cable (for example, the complete set 1 687 001 439) and the established program browser OBD II.

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

Some scanners, besides usual operations of diagnostics, allow, at connection with the personal computer, to unpack stored in memory of the block of management basic schemes of an electric equipment (if those are put), to program anticreeping system, to observe signals in car chains in real time.