Volkswagen Passat 1995 Official Factory Repair Manual page 1944

Multiport fuel injection and ignition system
http://ebahn.bentleypublishers.com/vw/servlet/Display?action=Goto&type=repair&id=VW.B4.FU07.24.1
Continuation
If no speed is indicated:
- Disconnect 3-pin connector from vehicle speed
sensor -1-.
- Switch ignition on.
- Connect multimeter using test leads from VW 1594
to measure voltage at terminals 1 and 3 of
connector.
Specification: 9-14.5 volts
- Switch ignition off.
- Reconnect connector.
If no voltage was present:
- Check wiring according to wiring diagram.
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12/6/2004