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Home >> Audi >> 2009 >> A8 Quattro >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 2 (6.0L - Fuel Injection And Ignition, Engine Code(S): BSB) >> 24 Fuel injection system >> Motronic fuel injection system, servicing >> Engine Control Module (ECM) -J623- (Master), replacing >> Notes

Engine Control Module (ECM) -J623- (Master), replacing: Notes

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Engine management is controlled by two engine control modules.

Both engine control modules communicate via private CAN-Bus.

Engine Control Module (ECM) -J623- (Master) shares with Engine Control Module (ECM) 2 -J624- (Slave) which functions need to be performed.

The two engine control modules look identical. If both engine control modules are removed, they must be marked before removal to prevent them from being interchanged when re-installing.

Master ECM 1: e.g. with "M"

Slave ECM 2: e.g. with "S"

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