Hey guys, I have been frying my brain over this S243 issue with my AWP 1.8t. Thus far I have disconnected.
-front/rear o2 sensors
-Leak detection pump
The fuse immediately shorts when the key is turned to "on" position with all these accesories removed. I also noticed when i pulled J271 (relay label 428, ECM Power Supply) the fuse does not short. I have some diagram references from my haynes manual as they are not very helpful though. Could anyone suggest a path to take next. My ECM should be sound, no exposure to water etc., butanyway to test it as well? Thanks