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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
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Read measuring value block 126
1
2
3
4
Note:
Display group 126 indicates all other systems that communicate with the
Engine Control Module (ECM) via the CAN-bus. If these systems are not
installed, the display fields that are intended for them will be empty.
The following systems will be indicated in display group 126, assuming
they are communicating with the Engine Control Module (ECM) via the
CAN-bus:
Display field 1: automatic distance control; indication: "Distance 1".
Display field 2: Steering angle sensor; indication: "Steering angle 1"
Display field 3: Airbag; indication: "Airbag 1".
Display field 4: System voltage; indication: "cnt. ELEC 1". - Check under display group 126 in the same manner.
-
Press button.
Rapid data transfer
HELP
Enter address word XX
When indicated on display:
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