You guys are GREAT! I can't believe all this was resolved w/ a K40 relay for $102!!!! That night I resoldered the connections on my orig K40 which didn't help, but I ordered a new K40 in the next morn and a day later I was no longer randomly pulling off on the freeway shoulder, and I haven't had an ETS / ABS code since. In fact I haven't had any codes since. I wend back to the schematics to see how I missed this. I had assumed it wasn't a power to the IFI issue since I could read voltage at correct levels via the unit itself. What I discovered is that there are multiple power sources to the IFI module. So even though it itself thinks it has power, it may not. 2 lessons: 1) start w/ this forum. 2) always go to the schematic and trace ALLL power supplies and grounds, and put a meter across ALL of them before assuming a module is bad.

Anyone need a used IFI or used ETS/ABS module for a 1996 E300?