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HOMESERVICE MANUALSAUDI2005A6 3.2 TREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 90 (5.2L - FUEL SYSTEM - ENGINE CODE(S): BXA)24 - FUEL INJECTION SYSTEMREMOVAL AND INSTALLATIONENGINE CONTROL MODULE 1, MASTERNOTES
2005 Audi A6 3.2 T

Engine Control Module 1, Master: Notes

2005 Audi A6 3.2 TSECTION Notes
WARNING: This page is about a different car, the 2011 Audi S6, 2010 Audi S6, 2009 Audi S6, 2008 Audi S6, and 2007 Audi S6. However, it is still accessible from the selected car via links, so may be relevant.

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 be performed to the Engine Control Module (ECM) 2 -J624- (slave).

GWWA10-10526Courtesy of AUDI OF AMERICA, LLC
NOTE:
  • 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 reinstalling.
  • 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).
  • 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 and workshop equipment required 

  • Heat Gun 220 V/50 Hz -VAS 1978/14- -1- with nozzle attachment -2- from Wiring Harness Repair kit -VAS 1978A-
    GWWA24-0475Courtesy of AUDI OF AMERICA, LLC
  • Small, commercially available locking pliers -3- (vise grips)
NOTE:
  • The Engine Control Module (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.
    GW00014448Courtesy of AUDI OF AMERICA, LLC
  • To disconnect the connectors from the ECM (e.g. to connect the test box or to replace the ECM), the protective housing must be removed.
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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.