A8L Quattro Sedan W12-6.0L (BSB) (2005)
Vehicle Speed Sensor: Testing and Inspection
Diagnostic Procedures
Speed Signal, Checking
Special tools, testers and auxiliary items required
‹› Hand multimeter (V.A.G 1526) or Multimeter (V.A.G 1715)
‹› Test adapter kit (V.A.G 1594)
‹› Wiring diagram
Test Conditions
‹› Motronic Engine Control Module (ECM) Power Supply Relay must be OK, checking:
‹› Motronic Engine Control Module (ECM) Power Supply Relay 2 must be OK, checking:
‹› Instrument Cluster Control Module (J285) must be OK.
‹› Battery voltage (both batteries) must be at least 11.5 Volts.
‹› The fuses must be OK:
Right instrument panel fuse holder
Test Sequence
Function test
‹› To check the speed signal, vehicle must be driven at a speed above 5 km/h.
Observe safety precautions that apply to road tests, refer to Repair Manual.
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Connect diagnostic tester.
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Start engine and let run at idle.
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Under address word 33, select "Diagnostic mode 1: Check measured values".
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Select measured value "PID 13: Vehicle speed".
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Perform a road test at a speed above 5 km/h and have a second person observe the indication on the display.
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Check specified value of the vehicle speed: