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Tech Talk Technical Discussion About The Nissan 240SX and Nissan Z Cars


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Old 01-14-2015, 12:05 PM   #31
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Originally Posted by dbeiler View Post
Since when does the ECU have anything to do with cranking the engine? You can disconnect the ECU and it'll still crank. I don't have an S13 but it can't be that much different from my 14s. Starting circuit works like this: Battery power > battery feed to underhood fusebox >underhood fuse box > 30amp fuse > wire running to ignition switch > ignition switch > wire running back out to fusebox > clutch interlock relay (ONLY if manual) or inhibitor switch (ONLY if automatic) > wire running to starter motor.

So you have no power at the ignition key? That narrows it down to: the battery, one fuse, and one wire running to ignition.
That is if you are running a non fuel injected car.

The ecu has all the spark and ignition drivers in it. The ecu will work on ground terminals. The ecu based on the cas will tell the ecu where the crank is and then fire the correct spark plug. If you put enough power through the harness and your fuse doesn't blow, the voltage will travel to the ecu and burn out your ignition drivers.

Don't do all this stupid chasing around. Try a new ecu and come back with results. Your wiring loom unless its hack to hell is fine.
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Old 01-15-2015, 10:59 PM   #32
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Wiring/ starting issues

A new ecu isn't the easiest thing given the swap. Have to find one that matches the current then send it for NATS Removal. That being the case I'm trying to eliminate all else before doing that.

I did get it to start and run for about 10 seconds before it died on me however I had to hold the key in the start position for about 20 seconds. Battery is now so dead it won't jump start. Only get fast starter clicks. Of course I didn't have a code scanner with me and battery was dead by the time I got back. Was hoping those 10 seconds would give me a code.

Last edited by nddavis2; 01-16-2015 at 04:24 AM..
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Old 01-16-2015, 10:23 AM   #33
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Ugh.... I feel for you man. That sucks....

So just reiterating what you said.

Fuel pump turns on.
Starter Cranks

Only problem is spark. Which you are saying it works when you hold the ignition in start position? I thought you weren't getting any spark?
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Old 01-16-2015, 10:55 AM   #34
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That's part of where I realized I hadn't updated the post completely.

Fuel pump turns on, starter cranks. Actually got it to start 1 time and run for about 10 seconds and then it died. Haven't been able to get it to start since.
I need to remove the coils and check to visually verify I have spark which I will do tomorrow
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Old 01-16-2015, 11:09 AM   #35
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Originally Posted by nddavis2 View Post
That's part of where I realized I hadn't updated the post completely.

Fuel pump turns on, starter cranks. Actually got it to start 1 time and run for about 10 seconds and then it died. Haven't been able to get it to start since.
I need to remove the coils and check to visually verify I have spark which I will do tomorrow
Cool man good luck... if you get inconsistent spark, then its somewhere in the harness
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Old 01-16-2015, 11:19 AM   #36
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Thanks. When I check it tomorrow I'll repost on here what I find. I really need to replace the harness. I'd love to just have one made but those sucker are crazy expensive
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Old 01-18-2015, 11:41 AM   #37
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Not going to be able to check spark for a few more days. Need help on the 350z harness.n3 plugs I have no home for.


Has yellow/ red wire and orange wire and runs near the back of the engine


Blue/ green I think the single wire is. Located near the maf plug

Don't have a pic of the 3rd but it's basically same as the first but has a light brown/ yellow wire and black.

Just need to know what these should go to on the vq as it could be part of my issues.
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