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General to self-diagnosis
Technical data of self-diagnosis
Equipment
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◆ The data transfer between control unit and fault reader V.A.G 1551 or vehicle system tester V.A.G 1552 is carried out in the operating mode "Rapid data transfer".
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◆ The fault memory is a non-volatile memory and is therefore dependent on the voltage supply.
Control unit identification
The control unit version is displayed when the fault reader V.A.G 1551 or the vehicle system tester V.A.G 1552 is connected and engine electronics control unit selected
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Selectable functions when using the fault reader V.A.G 1551 or V.A.G 1552
The prerequisites for selecting the desired functions can be taken from the following table.
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Function
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Prerequisite
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Functions on fault reader V.A.G 1551 or on system tester V.A.G 1552
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Engine stopped, ignition switched on
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Engine running at idling speed
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Vehicle being driven
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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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yes1)
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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 setting2)
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yes
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no
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no
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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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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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1)
Only carry out with ignition switched on, when engine does not start.
2)
Must be carried out after the following: Replacing engine control unit, throttle valve control part, engine or disconnecting battery.
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