A4 Quattro Cabriolet V6-3.0L (BGN) (2005)
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Pry off Engine Control Module (ECM) retaining bracket (arrows) using a screwdriver and set control module aside.
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If installed, unclip Transmission Control Module (TCM) retaining bracket and set control module aside.
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Remove Secondary Air Injection (AIR) pump relay -3-.
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Connect multimeter for voltage measurement as follows.
Relay carrier in E-box, plenum chamber,
Measure to
position 3
Terminal
8
Engine Ground (GND)
Specification: approx. battery voltage
If specified value is not obtained:
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Perform following tests marked with dots: