S6 Quattro Sedan V10-5.2L (BXA) (2007)
Engine Control Module: Service and Repair
Engine Control Module 2, Slave
Engine Control Module 2, Slave
Engine management on the V10 is controlled by two engine control modules.
Both engine control modules communicate via private CAN-Bus.
Engine Control Module (ECM) (J623) (master) communicates which functions need to performed to Engine Control Module (ECM) 2 (J624) (slave).
‹› Both engine control modules are identical. If both engine control modules are removed, they must be marked before removal to prevent them from
being interchanged when re-installing.
‹› Engine Control Module (ECM) (J623) (master): e.g. with an "M"
‹› Engine Control Module (ECM) 2 (J624) (slave): e.g. with an "S"
‹› Item - 1 - faces Engine Control Module (ECM) 2 (J624) (slave).
‹› Item - 2 - faces Engine Control Module (ECM) (J623) (master).
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If the engine control module is replaced, in "Guided Fault Finding" select "Replace Engine Control Module" to Vehicle Diagnosis, Testing and
Information System (VAS 5051B).
Special tools, testers and auxiliary items required
‹› Heat Gun 220 V/50 Hz (VAS 1978/14) with nozzle attachment from Wiring Harness Repair kit (VAS 1978A)
‹› Small, commercially available locking pliers (vise grips)
‹› The ECM - 1 - is bolted to a protective housing - 5 -. To make removing the shear bolts - 4 - for the retaining tabs - 2 - more difficult, the threads
are coated with locking compound.