A4 Quattro Wagon V6-2.8L (AHA) (1998)
Vehicle Speed Sensor: Testing and Inspection
Vehicle Speed Signal, Checking
Required special tools and test equipment
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VAG1551 or VAG1552 Scan Tool (ST) with VAG1551/3 adapter cable
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Multimeter US1119 (Fluke 83 or equivalent)
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VW1594 connector test kit
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Wiring diagrams
Test conditions
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Vehicle Speed Sensor (VSS) OK; checking:
NOTES:
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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.
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Read safety precautions for test driving vehicles while using test equipment.
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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
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Connect VAG1551 or VAG1552 scan tool and press buttons -0- and -1- to insert "Engine Electronics" address word 01 (with engine running at
idle). Refer to "Scan Tool Testing/Scan Tool Connecting and Initial Checks/Connecting VAG 1551/1552 Scan Tool" See: Testing and Inspection
Indicated on display
Rapid data transfer
HELP
Select function XX
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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
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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
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Road test and compare indicated vehicle speed with value in display field 3.
Display Group 5
If displayed value is OK:
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Press -> button.
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Press buttons -0- and -6- to select "End Output" function 06, and press -Q- button to confirm input.
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Switch off ignition.