TT Roadster L4-1.8L Turbo (AWP) (2003)
If the wiring is OK:
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Test fuel pump relay.
If the LED lights up:
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Test activation.
Testing activation
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Connect voltage tester V.A.G 1527 B to contact 1 (positive) and contact 2 of the connector.
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Start output diagnostic test mode and activate air recirculation valve for turbocharger - N249.
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The LED should flash.
If the LED lamp does not flash or lights up continuously:
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Connect test box V.A.G 1598/31 to wiring harness for engine control unit. Do not connect the engine control unit itself.
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Test for open circuit and short to positive or Ground in the wiring connection:
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Repair short circuit or open circuit if necessary.
If the wiring is OK:
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Replace engine control unit.