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Self-diagnosis of Motronic system
Technical data for self-diagnosis
Equipment
The term "self-diagnosis" relates specifically to the electrical and electronic part of the control system.
The control unit is equipped with a fault memory so that the fault can be traced quickly in the event of an electronic/electrical component failure or an open circuit.
The advantages of self-diagnosis can only be fully exploited by using the vehicle diagnostic, testing and information system VAS 5051 or the fault reader V.A.G. 1551, in operating mode 1 "Rapid data transfer."
Functions which the vehicle diagnostic, testing and information system VAS 5051 and the fault reader V.A.G 1551 can register , List of selectable functions.
The fault memory is equipped with a non-volatile memory and therefore does not depend on the power supply.
Faults relating to the electronic throttle are also indicated by a warning lamp in the dash panel insert.
Selectable functions when using fault reader V.A.G 1551
The prerequisites for selecting the desired functions can be taken from the following table.
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Address words and functions on fault reader V.A.G 1551
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Ignition on, engine not running
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Engine running at idling speed
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Vehicle being driven
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Address words
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00
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Automatic test sequence
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yes
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yes
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yes
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01
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Engine electronics
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yes
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yes
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yes
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Functions
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01
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Interrogate control unit version
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yes
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yes
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yes
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02
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Interrogate fault memory
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yes
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yes
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yes
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03
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Final control diagnosis
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yes
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no
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no
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04
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Basic setting
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yes
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yes
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yes
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05
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Erase fault memory
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yes
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yes
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yes
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06
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End output
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yes
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yes
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yes
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07
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Code control unit
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yes
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no
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no
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08
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Read measured value block
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yes
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yes
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yes
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