Volkswagen Passat 1995 Official Factory Repair Manual page 1342

Function tests
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If specified values are not obtained:
- End diagnosis and let engine continue to run at
idle.
- Check primary voltage
Checking primary voltage
- Disconnect 4-pin harness connector (black) to
Heated Oxygen Sensor (HO2S) -G39- (item no.
1).
- Connect multimeter for voltage measurement to
terminals 3 + 4 of connector to Engine Control
Module (ECM) and measure primary voltage.
Specified value: 0.400 to 0.500 Volts
- Switch ignition off.
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Page 24-89 .
6/12/2004