ECU Fuse Keeps Blowing after Trackday - No CEL - TT

JimmyK

Thanks again for the response! I started to do this but after a bit I looked at the schematic and saw that all the components, ECU included, are downwind of the ECU Relay which is in the IPDM box. Without the battery plugged in and the key in the ign position, the harness won't be live unless I get that relay to close somehow, or at least that's what I think is the case.

I confirmed this by purposely connecting a known component's harness to ground on both terminals and got no hits as well. The component was the EVAP Purge Solenoid.

Edit: Correction, there is one power line to the ECU that is pre-relay, but everything else including back up power supply to the ECU are all post-relay.