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No start, Fried ecu?, Nats?

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Old 03-12-2018, 05:43 PM
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Default No start, Fried ecu?, Nats?

Ok so i have a 03 350z, no start but cranks. When the key is in the on position, the fuel pump does not prime, radiator fan kick on full blast, and my ses light isnt on either so im pretty sure the ecu isnt powering up. I was just checking around and found 12v at one of the ecu pins so im sure its getting power. But my nats light is on solid when the key is in the on position, and i could have sworn the nats cuts off power to the ecu and fuel pump when the system is armed. The car had some issues starting every now and then but eventually started now not all. And if its a bad ecm will a 03 manual trans ecm swap right in, as long as i get the key programmed?
Pls help, THANKS
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Old 03-12-2018, 07:13 PM
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Welcome and there's been a rash of no start threads on this board recently. But like many new posters, there's quite a bit of information missing, Here's what I wish many noobies would include in questions like this:

1) How long have you owned this Z? Miles?
2) When did the no start problem begin happening?
3) Have you tried pulling any codes from the BCM section?
4) Have you tried using your spare key?
5) Any mods or repairs that preceded the no start condition?
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Old 03-13-2018, 06:12 AM
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Originally Posted by mx5_leo View Post
Ok so i have a 03 350z, no start but cranks. When the key is in the on position, the fuel pump does not prime, radiator fan kick on full blast, and my ses light isnt on either so im pretty sure the ecu isnt powering up. I was just checking around and found 12v at one of the ecu pins so im sure its getting power. But my nats light is on solid when the key is in the on position, and i could have sworn the nats cuts off power to the ecu and fuel pump when the system is armed. The car had some issues starting every now and then but eventually started now not all. And if its a bad ecm will a 03 manual trans ecm swap right in, as long as i get the key programmed?
Pls help, THANKS


From what you described, it sounds like you have a bad ECU. And as far as the ECU swap; I'm guessing you have an automatic..?
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Old 03-13-2018, 05:39 PM
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Originally Posted by dkmura View Post
Welcome and there's been a rash of no start threads on this board recently. But like many new posters, there's quite a bit of information missing, Here's what I wish many noobies would include in questions like this:

1) How long have you owned this Z? Miles?
2) When did the no start problem begin happening?
3) Have you tried pulling any codes from the BCM section?
4) Have you tried using your spare key?
5) Any mods or repairs that preceded the no start condition?
about a month
few days ago
scanner doesnít detect car
no spare key
i may have found the issue, I took out the radio and a lot of wires were left exposed by the previous owner. But can something on the radio harness can really fry an ecu? I would think a fuse or something, found no popped fuses and checked the ipdm fuses, and both fuse boxes
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Old 03-13-2018, 05:42 PM
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Originally Posted by Atreyu'z 350 View Post
From what you described, it sounds like you have a bad ECU. And as far as the ECU swap; I'm guessing you have an automatic..?
Yea I figured I ordered one on eBay but I possibly may have ordered and ecu for an auto and I have a manual
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Old 03-14-2018, 06:45 AM
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OK.. I would return that ECU and get one from a manual car to avoid the U1000 code and possible gear indicator readout related issues.
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Old 03-14-2018, 08:29 AM
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Ive heard so many mixed things about ecu swap/compatibility, can someone give me some insight would a ecu from a manual 04 z work in my manual 03? or theres more to it like matching part numbers etc. One of the nissan master techs told me the numbers on the ecu is not a part number, so it cant be identified, cant tell what car they came out of, if it'll fit etc.
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Old 03-14-2018, 10:58 AM
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The fuel tables are different within the ECU from 2003 to 2004, and after 2004.5 the ECU uses totally different coding altogether as well as stricter emission control programming(narrow vs. wideband O2 sensor thresholds).
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Old 03-15-2018, 07:34 AM
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Will any 03 manual trans ecm go into my car with no problem, after i program the ecu
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Old 03-15-2018, 10:36 AM
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YYup.
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Old 03-15-2018, 10:36 PM
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Iíve also forgot to mention the car would break up and jerk violently and break up around 5krpm, torque fell flat on its face. I also had a maf code though, so idk if it was the ecm going bad, or maf doing that. I bought a new maf but didnít even get to test it cause the ecu going
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Old 03-15-2018, 11:02 PM
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If your ECU is that corrupt it can start to disrupt the fuel tables and coil packs. I mean you can try cleaning your MAF, but if you ECU is bad then it's kinda like washing a car in the junk yard.. But you did get just that code.. Try cleaning your MAF and see what happens.
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Old 03-15-2018, 11:16 PM
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Originally Posted by Atreyu'z 350 View Post
If your ECU is that corrupt it can start to disrupt the fuel tables and coil packs. I mean you can try cleaning your MAF, but if you ECU is bad then it's kinda like washing a car in the junk yard.. But you did get just that code.. Try cleaning your MAF and see what happens.
The car actually came with the car but I was just poking around and found a super oily air filter, go figure lol.
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Old 03-16-2018, 04:01 PM
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Originally Posted by mx5_leo View Post

The car actually came with the car but I was just poking around and found a super oily air filter, go figure lol.
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Old 03-16-2018, 07:22 PM
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Originally Posted by mx5_leo View Post

The car actually came with the car but I was just poking around and found a super oily air filter, go figure lol.
Ehh? Typo?

But yeah, the MAF's on the Z does not like oily air filters. The petroleum gets on there and starts screwing up air volume readings. A simple paper one will suffice.
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Old 03-17-2018, 09:55 PM
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So I got the replacement ecu and all the numbers match up. I put it in but nothing. Now i know the car wonít start, because I have to program the ecm, but shouldnít the ses light light up? Cause mine doesnít, rad fans full blast, and my obd2 scanner powers up but canít connect to the car

Last edited by mx5_leo; 03-17-2018 at 09:59 PM. Reason: Typo
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