S4 V8-4.2L (BHF) (2004)
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Pry off Engine Control Module (ECM) retaining bracket (arrow) using a screwdriver and set control module aside.
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Remove power supply relay from position -3- of 3-pin relay carrier, E-box, plenum chamber.
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Perform the following tests marked with dots:
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Check wire connection from relay carrier in E-box, plenum chamber, position 3, terminal 8 to harness connector at ignition coil terminal 1.
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Check Motronic Engine Control Module (ECM) voltage supply relay -J271-.
Checking activation of power output stages
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Harness connector at ignition coils disconnected
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Disconnect connector strips -1- and -5- at fuel injectors.