|
Self-diagnosis of Motronic
Technical data on self-diagnosis
Features
The term "self-diagnosis" relates to the electrical/electronic section of the control system.
To enable the cause of the problem to be rapidly established in the event of failure of an electrical/electronic component or an open circuit in the wiring, the control unit is equipped with a fault memory.
Full use of the features offered by the self-diagnosis function can only be made using the vehicle diagnostic, testing and information system VAS 5051 or the fault reader V.A.G 1551 in mode 1 "Rapid data transfer".
For a list of functions covered by the vehicle diagnostic, testing and information system VAS 5051 or the fault reader V.A.G 1551, refer to , List of available functions.
The fault memory is designed as a non-volatile memory and is therefore not dependent on the power supply.
Faults of relevance to the electronic throttle system are additionally indicated by way of a warning lamp in the dash panel insert.
Functions available when using fault reader V.A.G 1551/1552 or VAS 5051
The following table indicates the conditions under which the desired functions can be selected.
|
Address words and functions for
fault reader
|
Ignition on,
engine stopped
|
Engine running,
idling
|
Vehicle in operation
|
|
Address words
|
|
|
|
|
00
|
Automatic test sequence
|
yes
|
yes
|
yes
|
|
01
|
Engine electronics
|
yes
|
yes
|
yes
|
|
Functions
|
|
|
|
|
01
|
Interrogate control unit version
|
yes
|
yes
|
yes
|
|
02
|
Interrogate fault memory
|
yes
|
yes
|
yes
|
|
03
|
Final control diagnosis
|
yes
|
no
|
no
|
|
04
|
Basic setting
|
yes
|
yes
|
yes
|
|
05
|
Erase fault memory
|
yes
|
yes
|
yes
|
|
06
|
End output
|
yes
|
yes
|
yes
|
|
07
|
Encode control unit
|
yes
|
no
|
no
|
|
08
|
Read measured value block
|
yes
|
yes
|
yes
|
| 
