A4 Cabriolet L4-1.8L Turbo (AMB) (2005)
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Connect voltage tester VAG 1527 B as follows:
3-way relay carrier in electronics
Measure to
box in plenum chamber, position
2, contact
6
Engine Ground
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Start output Diagnostic Test Mode and actuate Secondary AIR pump relay -J299-.
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LED must flash
If LED does not flash:
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Switch off ignition.
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Connect test box VAG 1598/31 to engine control module wiring harness. Engine control module must not be connected:
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Check for open circuit and short to Ground/positive in following wiring connection:
3-way relay carrier in electronics
Test box VAG 1598/31
box in plenum chamber, position
socket
2,contact
6
66
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If necessary, eliminate open circuit/short circuit.
If no fault is found:
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Replace Secondary AIR pump relay -J299-.
Checking power supply for secondary AIR pump motor