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No cranking? The battery had to be replaced. I replaced the starter?

Tiny
BSCAMP2011
  • MEMBER
  • 2012 NISSAN ALTIMA
  • 2.5L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 197,500 MILES
My car's MAF sensor went out, to follow up with an engine mount had cracked all the way through. I believe as to why it was shaking badly. I don't know if it has anything to do with the current issue.

The battery had to be replaced. I replaced the starter. The motor turns by hand, I pulled the spark plug, put it back on the coil and looked for spark. No spark. The starter clicks

I found an "Eng Con" 15 Amp fuse under the hood was blown.
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Friday, September 2nd, 2022 AT 12:56 PM

9 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
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Which number fuse is it? They don't show it by name, but it sounds like the IPDM needs to be replaced because this has two starter relays inside of it. It is common for this unit to go out. Here is a wiring diagram so you can see how the starter system works and how to replace the IPDM which is easy because it-self learns in the images below. Check out the diagrams (below). Please let us know what happens.
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Saturday, September 3rd, 2022 AT 7:30 AM
Tiny
BSCAMP2011
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The white box, 2nd fuse from the bottom on the left. The 15 Amp fuse that's upside down. Had blown.
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Saturday, September 3rd, 2022 AT 12:14 PM
Tiny
KEN L
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Thanks for the images, when you replace the fuse does it blow again? If so I would unplug the ignition coils and try to replace the fuse and then turn the key on to see if the fuse blows gain if not, plug the coils in one at a time to see when the fuse blows this will be the bad coil.
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Monday, September 5th, 2022 AT 8:50 AM
Tiny
BSCAMP2011
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The fuse hasn't blown yet. I drove it a couple miles yesterday. Just a really rough idle even more so accelerating. I shift myself to keep the rpm down. I will upload a video soon. Hopefully, it's this IPDM causing all this. Thank you Ken.
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Monday, September 5th, 2022 AT 9:26 AM
Tiny
BSCAMP2011
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Some videos, if they help.
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Monday, September 5th, 2022 AT 2:01 PM
Tiny
KEN L
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Thanks for the videos. It could be a vacuum leak that is causing this problem.

Check out this guide and do the test when the engine is cold:

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

And this can help as well:

https://www.2carpros.com/articles/engine-idles-too-high

Please run down these guides and report back.
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Tuesday, September 6th, 2022 AT 10:56 AM
Tiny
BSCAMP2011
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I used propane. I'll go buy a can and use the spray. I thought I had it wired correctly, maybe not. My MAF. Are you able to verify the wiring? Different colors on the pigtail.
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Thursday, September 8th, 2022 AT 2:46 PM
Tiny
BSCAMP2011
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Also, I pulled each coil/plug trying to verify I have good spark without checking my mega ohms on the meter. I didn't see a spark on any one of my plugs. How do you diagnose the IPDM?
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Thursday, September 8th, 2022 AT 10:22 PM
Tiny
KEN L
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I believe the IPDM can be detected by a CAN scan which is easy these days, you can get a CAN scanner (Controller Area Network) from Amazon for about $30.00.

Here is a video to show you how:

https://youtu.be/u-4syLc-ifQ

Here is a scanner link:

https://amzn.to/3o41KcZ

Let me know what comes up.
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Saturday, September 10th, 2022 AT 2:09 PM

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