TT Roadster L4-1.8L Turbo (AWP) (2003)
Display on VAS 5051:
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Take vehicle for a test drive and check whether the road speed appears in display zone -3-.
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If the road speed does not appear, raise the vehicle (preferably using a lifting platform) until the front left wheel is clear of the ground.
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Connect test box VAG 1598/31 to wiring harness for engine control module. Do not connect to the engine control module itself. See: Testing and
Inspection/Scan Tool Testing and Procedures/Scan Tool Testing/With Manufacturer's Scan Tool/Scan Tool Connecting and Initial Checks/Wiring
and Component Testing Using VAG1598/31 Test Box
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Connect VAG 1527 B voltage tester to sockets 3 (positive) and 54 (road speed signal) on test box VAG 1598/31.
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Switch on the ignition and turn the front left wheel by hand.
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The LED should flash very briefly.
If the LED does not flash:
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Test for open circuit and short to positive or Ground in the following wiring connection:
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Test box VAG 1598/31 Socket - 54 (Instrument cluster)
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Correct short circuit or open circuit if necessary.