Volkswagen Passat 1995 Official Factory Repair Manual page 1955

Multiport fuel injection and ignition system
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Continuation
If the display does not indicate as described:
- Connect VAG 1598/18 test box to ECM wiring
harness (arrow).
- Check wiring between test box sockets 37 and 39
respectively and A/C for open circuit according to
wiring diagram.
Resistance: max. 1.5 ohms
If the specification is not attained:
- Check wiring according to wiring diagram.
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12/6/2004