The next day, continue, cold operation;

GS8602 --- 0x000001 EGS: Pressure actuator EDS 1 --- Unknown
GS8602 --- 0x000004 EGS: Pressure actuator EDS 4 --- Unknown
GS8602 --- 0x000010 EGS: Solenoid valve 1 --- Unknown
GS8602 --- 0x000011 EGS: Solenoid valve 2 --- Unknown
GS8602 --- 0x000012 EGS: Solenoid valve 3 --- Unknown
IKI --- 0x00008D IKE: EGS signal line disturbed --- Unknown


after delete fault mem and rescan

GS8602 --- 0x000010 EGS: Solenoid valve 1 --- Unknown
GS8602 --- 0x000012 EGS: Solenoid valve 3 --- Unknown
IKI --- 0x00008D IKE: EGS signal line disturbed --- Unknown


remove and inspect the Printed Circuit Board for the Transmission control module

Found a possible over current / shorted trace internal to the multi-layer circuit board, with some damage visible from the top side.
cleaned both sides of board with deoxidizer, brakeclean. hot-aired the connector pin solder points on the back of the board.

reinstall, clear codes, scan again
GS8602 --- 0x000010 EGS: Solenoid valve 1 --- Unknown
IKI --- 0x00008D IKE: EGS signal line disturbed --- Unknown

at this point based on my troubleshooting and what I have observed I am satisfied that the issue has been isolated to the control module having failed.




My next question to the community is;
used modules from ebay - since I have never replaced bmw modules before. can I take a used module from the 4.4 engine with 2003 year and install this, any special procedures ?

attachments;
damage/corrosion on PCB before and after cleaning
corrosion found on dme connector

Attached Images

   

__________________
2003 4.6, esotril blue, over 215,000KM. Every previous owner failed to keep up the vehicle maintenance. Restoration project.