Volkswagen Passat 1995 Official Factory Repair Manual page 1699

Motronic Fuel Injection and Ignition system, component layout
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Safety precautions
To prevent injuries to persons and/or damage to
the fuel injection and ignition systems, observe
the following points:
Do not touch or disconnect ignition wiring when
the engine is running or being cranked at
starting speeds.
The ignition must be switched off before
connecting or disconnecting fuel injection or
ignition system wiring or tester cables.
If the engine is to be turned at starter speed,
without starting, e.g. when checking
compression, disconnect the 5 pin harness
connector from the ignition coil.
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