Where o' Where could it be

[jayturk99]

I am trying to locate the transmission control unit (TCU/TCM) on a 1993 325is. Some have suggested under the hood on the right near the firwall, no luck. Others have suggested inside behind the passenger side kick panel, haven't tried that one yet. Does anyone know where this component is? I am having the dreaded "limp" and wanted to try and clean the contacts and see if I can gets some positive results. If this unit is swapped out will it have to be programmed to the transmission or will it program itself??? Help, thanks.

[johnnyBgood]

Originally Posted by jayturk99

I am trying to locate the transmission control unit (TCU/TCM) on a 1993 325is. Some have suggested under the hood on the right near the firwall, no luck. Others have suggested inside behind the passenger side kick panel, haven't tried that one yet. Does anyone know where this component is? I am having the dreaded "limp" and wanted to try and clean the contacts and see if I can gets some positive results. If this unit is swapped out will it have to be programmed to the transmission or will it program itself??? Help, thanks.

It is located in passenger side of the engine firewall behind the 2 covers shown in link below........it will be labeled 1 for automatic transmission computer & 2 for Engine ECU. So the upper one is AT Control Unit.

TMS - ECU Removal E36

jb

[jayturk99]

Thanks a bunch. I was tinkering with that yesterday and became frustrated because I could not completely remove the cover, now I see that 4th screw. Your assistance is greatly appreciated.

[jayturk99]

I gave it a shot and was able to disconnect the connecting cables, I was not able to get the unit out. I removed two nuts holding it from above, feels like anothe bolt/nut is holding from the rear, can't see it to remove. any other suggestions?