Engine Control Module 1, Master: Notes
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).
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-
- 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.
- 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.