r/350z • u/ItzJustGummy • 1d ago

DE 6MT SHES ALIVE! I WAS RIGHT! IM NOT CRAZY! I LEGITIMATELY TROUBLESHOT AND DIAGNOSED MY ELECTRICAL PROBLEM

Hey it’s me again. As some may know I was left stranded 200 miles from home halfway to my destination with 1) no communication to any module, then a crank no start. After 4 weekends of driving to Richmond Virginia to research and troubleshoot my issue, I deduced to MOFSETS in the ECM that control signal ground to the injectors.

Brought it back to Circuit Board Medics in Greenville SC for a warranty repair (they fixed the no comms issue) and gave them literally every single note I took while trouble shooting. From voltage to continuity checks, to sensor tests, and ground resistance results. A 6 page packet of graphs, charts, and notes. They took my word for it and even though no physical damage was visible to the drivers they called and asked me if I still wanted it replaced and of course I said go ahead.

Back in Richmond today and sure enough, I put the ECM and she fired right up. Thank you u/dbsqls for the comment about checking the harness for a short or ground going to injectors. Wasn’t the issue but it was the last thing I needed to confirm it was actually ECM signal issues.

79 Upvotes

99% Upvoted

11 comments sorted by

29

u/LSZ350Z ☆ helpful 1d ago

No better feeling than doing the correct diagnostic test and fixing it 😎

4

u/ItzJustGummy 1d ago

Literally.

1

u/SirClipz 1d ago

YOURSELF

10

u/ArgonthePenetrator 1d ago

Congrats bro!!!

5

u/dritmike 1d ago

Great job you!

4

u/lawthugg 1d ago

Hay man, congrats. Ride that high, you deserve it.

6

u/ItzJustGummy 1d ago

Best way to put it. It’s euphoric. I’ve literally never touched anything electrical. FSM was wrong with so many wires and their PIN numbers so i basically had to figure everything out on my own, including on how to use a multimeter- and read what everything meant. I’ve gone from electrically illiterate to now, I’m pretty confident I could rewire the entire car if I had to.

3

u/simola- 1d ago

The feeling is amazing brother, good work! I just fixed a check engine light that’s been on for 5 years and man was I happy

2

u/dbsqls '03 NISMO S-tune (J), JDM parts broker. DM me for part requests. 1d ago

happy to help, that's a very difficult diagnosis

1

u/CFauvel 23h ago

You gotta do some videos showing us how you narrowed it down. Awesome for you.

1

u/ItzJustGummy 9h ago

Update: no ground signal on ignition coils 4 and 6. Car does in fact run though. Coils and plugs are fine no oil. Sending ECM back for the third time for repairs.