A4 Quattro Sedan V6-2.8L (ACK) (1997)
Vehicle Speed Sensor: Testing and Inspection
Required special tools and test equipment
-
VAG 1551 or VAG 1552 Scan Tool (ST) with VAG 1551/3 adapter cable
-
Multimeter US1119 (Fluke 83 or equivalent)
-
VW1594 connector test kit
-
Wiring diagrams
Test conditions
-
Vehicle Speed Sensor (VSS) OK; checking:
NOTE:
-
To check Vehicle Speed Sensor -G68-, the vehicle must be driven. A second technician is required to operate the scan tool during the road test.
-
Read safety precautions for test driving vehicles while using test equipment. See: Fuel Delivery and Air Induction/Service Precautions/Technician
Safety Information
-
The speed signal is generated by the vehicle speed sensor (at the transmission), and processed at the speedometer/odometer in the instrument
cluster.
Test procedure
-
Connect VAG 1551 or VAG 1552 scan tool and press buttons -0- and -1- to insert "Engine Electronics" address word 01 (with engine running at
idle).
Indicated on display
Rapid data transfer
HELP
Select function XX
-
Press buttons -0- and -8- to select "Read Measuring Value Block" function 08, and press -Q- button to confirm input.
Indicated on display
Read Measuring Value Block
HELP
Input display group number XXX
-
Press buttons -0-, -0- and -5- to input display group number 5 (005), and press -Q- button to confirm input.
Indicated on display (1-4 = display fields)
Read Measuring Value Block 5
->
1
2
3
4
-
Road test and compare indicated vehicle speed with value in display field 3 (2nd technician required, See: Fuel Delivery and Air Induction/Service
Precautions/Technician Safety Information )
Display Group 51
If displayed value is OK:
-
Press -> button.