Volkswagen Passat 1995 Official Factory Repair Manual page 1338

Components of engine, checking
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Test 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
(RPM)
- Observe the 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 61 of 62
24-85
Page ST-8 .
6/12/2004