How would you guys fix this? Coolant temp sensor

[elwesso]

So for the last couple days I've had a weird problem with my car stalling or cutting out for a second every so often..

One time I managed to get a check engine light, and I checked the codes and I got the code for the engine coolant temp sensor...

I first noticed this when i took my ECU out to change the program and my car started acting funny... When I would wiggle the ECU it would cut out, sometimes stalling..

I verified this with my multimeter... When i wiggle the ground is definitely really iffy...

Anyway, after some digging this afternoon there is a B/Y wire which i believe is the ground for the coolant temp sensor. Refer to page EF-EC 89 of the 1994 Q45 FSM... Anyway, its a single wire going from the ECU harness and then splits into 3 wires, all B/Y.. In the wiring diagram, it shows it splitting in 2, not sure where the 3rd goes?

Heres my question.. I could obviously run a jumper wire from this and ground it, no biggie.. Would you guys do this, or would you take some other attack?

[T45]

I bet you've swapped ECU's 100 times and probably have a pinned wire that is coming out of the connector. Also, I am discovering that Nissans are lacking a lot of grounding in their cars. A few 350z owners claim incredible gains from adding a grounding kit to their cars, including to their ECU's and transmissions. Benefits are claimed increased audio volume, faster acting electronics throughout car, faster and more solid shifting via a/t and increased throttle response. I would believe that you have a ground issue. Where....good question.

[elwesso]

You win the big prize my man...

Shoved a straight pin in by the pin on the connector so its nice and tight now, works like a dream!

Thing that bums me out that is if this had happened to anyone else, they would have taken it to a shop and they probably never would have found it.

[T45]

Maybe, unless they brought it to me...lol Glad you found it.

Almost 100% of the time you can trace an issue back to what was touched last. I am a satcom tech and when troubleshooting we usually input more issues into the systems by troubleshooting than when we arrive onboard. We find a lot of issues from previous techs work, instead of from actual parts failures.

Anyways, when I need another ECU tune remember me!!!

[newbissan-tech]

that's crazy you found that! when we talked at import alliance i kinda thought that was a possibility but with out digging into it, it's kinda hard to tell! but congrats on your find!

[elwesso]

yeah and it actually turns out that the switch on my 8-program ECU was bad too, causing part of the problem..

So ive swapped a new ECU in until I get my other one fixed, and im back to destroying the streets.

[LEMHEAD16]

Will there ever be another run of NICO ECUs?

[elwesso]

uhh ive been running them for a while, just gotta say the word my man, ive got some ready to go.

[newbissan-tech]

no doubt i need to get one as well, like we talked about! lmk thanks