Volkswagen Passat 1995 Official Factory Repair Manual page 1862

Multiport fuel injection and ignition system
http://ebahn.bentleypublishers.com/vw/servlet/Display?action=Goto&type=repair&id=VW.B4.FU07.24.1
Idle speed, checking
Idle speed, ignition timing and CO content not
adjustable
Idle speed is regulated by the throttle valve
control module
The position of the distributor has no influence
on ignition timing
The CO content is held to specification by the
Oxygen Sensor (O2S) control. Malfunctions in
O2S control will be detected by the On Board
Diagnostic (OBD) program and stored in
Diagnostic Trouble Code (DTC) memory
Special tools, testers and auxiliary items
VAG 1551 scan tool with VAG 1551/3 adapter
cable
Test conditions
No malfunctions stored in DTC memory
Page 01-12
Engine oil temperature min. 80 C (176 F)
Electrical consumers switched off (radiator
coolant fan must not run during the check)
A/C switched off
Exhaust system must be free of leaks
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12/6/2004