Volkswagen Passat 1995 Official Factory Repair Manual page 1730

Motronic Fuel Injection and Ignition system
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Safety precautions
To prevent injuries to persons and/or damage to
the injection and ignition system, observe the
following points:
Do not touch or disconnect ignition wiring when
the engine is running or being cranked by the
starter.
The ignition must be switched off when
disconnecting or connecting fuel injection and
ignition system wiring as well as test instrument
cables.
If the engine requires cranking without starting,
e.g. when checking compression, disconnect 5
pin harness connector from ignition coil.
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