S4 V8-4.2L (BHF) (2004)
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Pull off rubber seal of plenum chamber cover in direction of arrow.
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Remove cover -1- toward front.
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Remove cover for E-box, plenum chamber -arrows-.
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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-fold relay carrier, E-box, plenum chamber.
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Connect test box to wiring harness of Engine Control Module (ECM), ECM is not connected. See: Computers and Control Systems/Testing and
Inspection/Reading and Clearing Diagnostic Trouble Codes/Scan Tool Connecting/Test Box, Connecting For Wiring and Component Test