Volkswagen Passat 1995 Official Factory Repair Manual page 1049

Multiport fuel injection and ignition system
http://ebahn.bentleypublishers.com/vw/servlet/Display?action=Goto&type=repair&id=VW...
Idle speed, checking
Idle speed, ignition timing and CO content not
adjustable.
The 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 control. Malfunctions in oxygen
sensor control will be detected by On Board
Diagnostic (OBD) 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 , checking DTC memory
Engine oil temperature minimum 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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6/12/2004