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General to self-diagnosis
Technical data of self-diagnosis
Control unit identification
The control unit version is displayed when the fault reader V.A.G 1551, the vehicle system tester V.A.G 1552 or the new tester VAS 5051 is connected and engine electronics control unit selected .
Equipment
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Engine code
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AYL
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System designation
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Motronic ME7.1
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Exhaust emissions conform to
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EU4 standard
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EPC system
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yes
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Self-diagnosis
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OBD
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Final control diagnosis
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yes
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Operating mode of data transfer to V.A.G 1551/1552
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Rapid data transfer
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Lambda regulation
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2 probes
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Knock control
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2 knock sensors
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Twin-path intake manifold
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yes
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Fault memory
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Non-volatile memory1)
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Memory for learnt values
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Volatile memory2)
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Variable camshaft timing
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yes3)
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Charge pressure control
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no
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Secondary air system
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yes
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1) Independent of voltage supply.
2) Values are erased when voltage supply is interrupted.
3) Adjustment of inlet and exhaust camshafts.
Functions which can be selected when using the fault readers V.A.G 1551/1552 or VAS 5051
The prerequisites to select the desired functions can be found in the following table.
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Function
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Prerequisite
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Functions on V.A.G 1551/1552 or on
VAS 5051
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Engine stationary, 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 settings2)
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yes3)
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yes4)
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yes4)
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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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10
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Adapting
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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-off readiness code
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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 (operate starter for at least 6 seconds first).
2) Must be carried out after the following: Replacing engine control unit, throttle valve control part, engine or disconnecting battery.
3) During adaption of throttle valve control part.
4) During Lambda regulation adaption in basic setting and OBD functions.
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