Volkswagen Passat 1995 Official Factory Repair Manual page 2139

Engine components,checking
http://ebahn.bentleypublishers.com/vw/servlet/Display?action=Goto&type=repair&id=VW.B4.FU08.24.2
Work sequence
Note:
Vacuum in the intake system sucks in the leak
detection spray with false air. Leak detection
spray decreases ignition quality of the fuel
mixture. This causes a drop in engine speed
and changes the value produced by the Heated
Oxygen Sensor (HO2S).
It is absolutely necessary to follow the safety
precautions listed on the can.
- Connect diagnostic tester
- Start engine and let run at idle.
- Under address word 33, select "Diagnostic
mode 1: Checking measured values."
- Select the following measured values:
PID 06: Short time gasoline-air ratio bank
1,
PID 12: Engine rotations per minute.
- Observe short time gasoline-air ratio bank 1 as
well as engine speed.
- Spray intake system parts with engine leak
detection spray in a systematic manner.
Page 58 of 59
24-84
Page ST-7 .
12/6/2004