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I have an Infiniti FX 35 that is blowing ignition eccm fuses

Customer Question
I have an Infiniti FX 35 that is blowing ignition eccm fuses
Submitted: 1 year ago.Category: Nissan
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Answered in 1 minute by:
1/21/2016
Nissan Mechanic: Jay, Nissan Technician replied 1 year ago
Jay
Jay, Nissan Technician
Category: Nissan
Satisfied Customers: 20,648
Experience: 20+yrs experience with Nissan & Infiniti Trained & Certified.Currently still working for Dealer
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Hello my name is ***** ***** thank you for your question.

Where is the fuse exactly located so I can pull up this circuit with this fuse.

Let me know..

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Customer reply replied 1 year ago
In the ipdm slot 20A
Nissan Mechanic: Jay, Nissan Technician replied 1 year ago

https://dl.dropboxusercontent.com/u/105565483/1.jpg

Can you tell me what number fuse it is using this image I provided?

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Customer reply replied 1 year ago
77
Nissan Mechanic: Jay, Nissan Technician replied 1 year ago

Hang on please.. reading....

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Customer reply replied 1 year ago
It will try to start then the fuse blows and it will no longer try to start
Nissan Mechanic: Jay, Nissan Technician replied 1 year ago

ok, there is allot in that circuit.. Are you a shop? How good are you at electrical?

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Customer reply replied 1 year ago
I have a degree
Nissan Mechanic: Jay, Nissan Technician replied 1 year ago

ok then. Please give me a few while I extract all the data from the service manual and share it with you so you can work on isolating this short. It will take me a while to do this so hang tight please..

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Customer reply replied 1 year ago
Ok
Nissan Mechanic: Jay, Nissan Technician replied 1 year ago

As I was grabbing data for you, I just remembered something.. Have you checked your coils to see if any are blistered? or did you have to replace any coils cause they were blistered?

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Customer reply replied 1 year ago
I replaced all the coils 2 mos ago
Nissan Mechanic: Jay, Nissan Technician replied 1 year ago

ok.. we may be on to something.. Were they blistered?

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Customer reply replied 1 year ago
No
Nissan Mechanic: Jay, Nissan Technician replied 1 year ago

Why was it changed? What was wrong with it?

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Customer reply replied 1 year ago
But when hooked up to the computer it read 2 were bad so I replaced them all. Subsequently had to replace a few of them again. Then sent the eccm in for repair. Now the fuse keeps blowing
Customer reply replied 1 year ago
After I replaced them again it rand fine for 359 miles then quit running completely and the computer read errors across the board which is when I sent in the ECM
Nissan Mechanic: Jay, Nissan Technician replied 1 year ago

Ok.. Let me explain a old issue I recalled while looking up your info.

When these FX's were having coil problems, it was normally caused by the negative battery cable. To much resistance. So it would over heat the ground circuit and would damage coils. When this happens it would affect all the coils. So once this starts to happen, all the coils would need to be replaced with the battery negative cable or eventually it can burn out the Ecm. This sounds very similar to your issue.

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Customer reply replied 1 year ago
what do you recommend I do now?
Nissan Mechanic: Jay, Nissan Technician replied 1 year ago

Well, I am going to share the info with you. Here it is..

https://dl.dropboxusercontent.com/u/105565483/07%20FX.pdf

https://dl.dropboxusercontent.com/u/105565483/Blistered%20coil.jpg

The second link is what I mean when I say a blistered coil. Did any of your coils look like this before replacing them?

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Customer reply replied 1 year ago
Coils weren't blistered
Nissan Mechanic: Jay, Nissan Technician replied 1 year ago

If the coils were not blistered, then this may not be the issue. But I have provided you information which all has fuse 77 in the circuit so you can check and isolate the issue.

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Nissan Mechanic: Jay, Nissan Technician replied 1 year ago

Do you have any more questions on this?

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Customer reply replied 1 year ago
what should I do?
Nissan Mechanic: Jay, Nissan Technician replied 1 year ago

Well if the fuse blows as soon as you turn the key on, I would disable circuits to see if I can isolate the issue to a particular circuit. I gave you the Ecm power supply, Intake valve timing and Cam sensor circuit and coil circuit. so you can go through each circuit to isolate the issue.

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Nissan Mechanic: Jay, Nissan Technician replied 1 year ago

If you have any more questions on this, please feel free to ask.

If not, and you're satisfied with my help, please Rate me. That is how I get credit for my work.

I hope I have provided you with Excellent Service.

Thanks Jay!

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Customer reply replied 1 year ago
I see when they redid the battery growing they just grounded it to the body 6" away. Shouldn't it be grounded to the frame?
Nissan Mechanic: Jay, Nissan Technician replied 1 year ago

The body is more or less the frame. They have a subframe they use to hold the engine assembly. But the frame is built into the body

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Nissan Mechanic: Jay, Nissan Technician replied 1 year ago

I thought there was another cable they recommended to replace which was from the body somewhere by cylinder 1 to the engine block also.

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Nissan Mechanic: Jay, Nissan Technician replied 1 year ago

Do you have anymore questions on this?

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Nissan Mechanic: Jay, Nissan Technician replied 1 year ago

If you have any more questions on this, please feel free to ask.

If not, and you're satisfied with my help, please Rate me. That is how I get credit for my work. I hope I have provided you with Excellent Service.

Thanks Ja

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