A4 Sedan L4-2.0L Turbo (BPG) (2005)
Vehicle Speed Sensor Signal: Testing and Inspection
Speed Signal, Checking
Test requirement
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Function and display of speedometer OK.
CAUTION: To reduce the risk of accident during road tests, always observe safety precautions.
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Connect the diagnostic tester.
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Start the engine and let run at idle.
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Select "Diagnostic mode 1: Obtain data".
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Select the measured value "PID 13: Vehicle speed".
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Perform a road test, and have the 2nd person observe the indication on the display.
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Check the specified value of the vehicle speed:
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End the diagnosis and switch ignition off.
If no speed is displayed:
The speed signal is transferred from the Engine Control Module (ECM) J623 to the instrument cluster via wire connection or via CAN-Bus, depending
on version.
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Check the wiring connections.
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Check the terminal resistance for the CAN-Bus.
Final procedures
After repair work, the following work steps must be performed in the mentioned sequence:
1. Check the DTC memory.
2. If necessary, erase the DTC memory.
3. If the DTC memory was erased, generate readiness code.
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End diagnosis and the switch ignition off.