Allroad Quattro V8-4.2L (BAS) (2004)
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Disconnect connector -1- at secondary air injection (AIR) pump motor V1 01 _.
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Connect voltage tester V.A.G. 1527 B between contacts -1- and -2-.
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Vehicle diagnostic, testing and information system VAS 5051 connected; vehicle self-diagnosis and vehicle system "01- Engine electronics"
selected. Ignition must be on.
Indicated on VAS 5051:
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From list -1- select diagnostic function "03- Final control diagnosis".
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Keep touching > key, until the secondary air injection (AIR) solenoid valve -J299- is activated.
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LED must flash
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Terminate function "03- Final control diagnosis" by touching < key.
If LED does not flash:
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Perform the following checks marked with a dot.
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Use wiring diagram to check for open circuit in wiring from contact 2 of connector to secondary air injection (AIR) pump relay J299- (in relay
carrier in plenum chamber electronics box, position 2).
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Use wiring diagram to check for open circuit in wiring from contact 1 of connector to ground.
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Use wiring diagram to eliminate open circuit in wiring.
If no fault is found:
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Replace secondary air pump.