Volkswagen Passat 1995 Official Factory Repair Manual page 1341

Function tests
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Parking brake must be engaged or else
daylight driving lights will be switched on.
For vehicles with automatic transmission,
selector lever must be in -P-.
If vehicle is equipped with an A/C system, it
must be switched off.
Exhaust system must be properly sealed
between catalytic converter and cylinder
head.
Coolant temperature must be at least 80 C
Page ST-15 , Diagnostic mode 1: Check
measured values; PID 5, Coolant
temperature.
Oxygen sensor heater for oxygen sensor
before catalytic converter must be OK, check
Page 24-25 .
Test sequence
- Select the lambda test results and check
whether the specified values are being reached
Page ST-28 , Diagnostic mode 5: Check
output of oxygen sensor signals.
If specified values are obtained:
- End diagnosis and switch ignition off.
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6/12/2004