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Old 01-03-2023, 04:13 PM   #6 (permalink)
JimmyK
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Join Date: Apr 2022
Location: LA
Posts: 14
Drives: 14 370Z BL MT
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Quote:
Originally Posted by Spooler View Post
Maybe a little more direction. Disconnect from the battery. Plug in DMM leads to the fuse and ground. Start fiddling around with the wiring harness to see if you can locate the short. You may need to disconnect the wiring harness from the ECU if you have continuity.
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.

Last edited by JimmyK; 01-03-2023 at 04:23 PM. Reason: Correction
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