Allroad Quattro V8-4.2L (BAS) (2004)
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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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Secondary air pump relay (in 3-position relay carrier in plenum chamber electronics box, position 2) must be energized and secondary air
pump motor -V101 must run intermittently
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Terminate function "03- Final control diagnosis" by touching 4 key.
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Switch ignition off.
A - If relay is not energized:
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Check secondary air injection (AIR) pump relay power supply.
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Check actuation of secondary air pump relay.
B - If relay is energized but secondary air pump motor does not run:
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Check power supply for secondary air pump motor.