Beetle L4-1781cc 1.8L Turbo (APH) (1999)
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Read off the supply voltage for the Engine Control Module (ECM) in display zone 2.
Display Group 4
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Press -> key.
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Press keys 0 and 6 for the function "End output" and confirm entry with the Q key.
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Switch off ignition.
Evaluating display group 4, display zone 2 - Control module voltage supply
If the specification is not attained:
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Remove inner plenum chamber cover, left: