warning AUDI A4 1999 B5 / 1.G APB Engine Additional Signals Checking Workshop Manual

24-182

Vehicle Speed Signal (VSS), checking


Notes:

The vehicle speed signal is generated by the
Vehicle Speed Sensor (VSS) -G68 (on the
transmission) and is processed in the
instrument cluster.
The processed signal goes to terminal 54 on
the engine control module and is used for Idle
Air Control (IAC) and for the damping of load
change jolts when changing gear.

- Start engine.

- Connect vehicle diagnostic, testing and
information system VAS 5051 or VAG1551 scan
tool and select engine electronics control
module by entering address word "01" Page 01
-9 .

- Select "Read measured value block" (function
08) and Display Group 5. Read Measuring Value Block 5
1
2
3
4

Indicated on display:
Warning!
During a road test in an airbag equipped vehicle, VAG1551 must
Pa
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