A6 Quattro Wagon V6-3.0L (AVK) (2002)
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Remove E-box cover in plenum chamber -arrows-.
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Remove Secondary Air Injection (AIR) Pump Relay -2-.
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Connect multimeter for voltage measurement as follows.
Relay carrier in E-box, plenum
Measure to
chamber, position 3
Terminal
8
Engine Ground (GND)
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Specification: approx. battery voltage