S5 Quattro Coupe V8-4.2L (CAUA) (2009)
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Engine Control Module: Description and Operation
Engine Control Module
The 4.2L CAUA engine is regulated by one Engine Control Module (ECM), J623.
The Motronic Engine Control Module (ECM) (J623) regulates fuel injection, Throttle Valve Control Module (J338), oxygen sensor regulation,
ignition, knock control, Evaporative Emission (EVAP) Canister Purge Regulator Valve (N80), engine speed limitation through fuel injectors or
Engine Component Power Supply Relay (J757) as well as On Board Diagnostic (OBD).