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04 nissan pick up fuel dumping from exhuast

  • gilbert
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07 Feb 2019 22:05 #26870 by gilbert
God bless you my brothers and sisters.
I have this 04 Nissan pick up engine ka24e truck came in with a busted timing chain that was installed at another shop. This time customer wanted to rebuild engine after all done I have smoke coming from exhaust and fuel dumping from exhaust. I checked the injectors and the #2 was wired backwards at the plug. I don't know if it make a difference.What does make a difference is that on injector #2 with key on I have gnd n signal wire and on the rest no.Question here is this a bad ecm because with key off and test light to power it does not light, only with key on. Here are some pics of injector plug unplugged at time of test and also spot on ground of fuel leak. Thank you for your help.
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08 Feb 2019 06:56 #26872 by Tyler
So do I understand correctly that the white/blue wire is an injector control wire, and that it lights the test light steadily with the key on? :blink: If so, I'd agree with ECM problem.

To be clear, #2 is the only one that does this? Do the other injectors work correctly, or not at all?

You're getting all the problem Nissans these days, huh? :silly:
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08 Feb 2019 15:42 #26886 by gilbert
Replied by gilbert on topic 04 nissan pick up fuel dumping from exhuast
God bless you my brother and sisters.
Yes Tyler that is correct the wht/blu is control others wire wht/blk is power. Also yes on that the only one that does this is the #2, #1#3#4 with key on test light to power it does not turn on.



LOL yes Nissan is keeping me busy I wasn't able to fix the sentra I failed the costomer:( :( :(

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08 Feb 2019 23:16 - 08 Feb 2019 23:17 #26889 by Monde
Is this the wiring diagram for the truck? wd.pdf[/attachment[attachment=4839]wd.pdf[/attachment

Vouloir, c'est pouvoir.
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08 Feb 2019 23:48 #26890 by gilbert
Replied by gilbert on topic 04 nissan pick up fuel dumping from exhuast
God bless you my brothers and sisters.
Monde im sorry that I didn't mentioned this but I live in Mexico and if I say 04 in the USA it's a 97. At least that is the diagram I'm looking at.
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09 Feb 2019 06:02 #26891 by Monde

gilbert wrote: God bless you my brother and sisters.
Yes Tyler that is correct the wht/blu is control others wire wht/blk is power. Also yes on that the only one that does this is the #2, #1#3#4 with key on test light to power it does not turn on.



LOL yes Nissan is keeping me busy I wasn't able to fix the sentra I failed the costomer:( :( :(


So, Blk/ Red is the power feed to all the injectors and Wht/ Blue is the control wire for # 2 injector. right? You stated that the wht/ blk is power, that is why I asked you if that is the right diagram for the truck.
Just trying to get everything right to do a proper diagnosis.

Vouloir, c'est pouvoir.

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09 Feb 2019 07:30 #26895 by juergen.scholl
Replied by juergen.scholl on topic 04 nissan pick up fuel dumping from exhuast
Gilbert, saludos desde México tambien.

So if you get a permanent ground with key on engine off at the wh/bl wire and this wiire is not shorted to ground as indicated by the test light not lighting at key off, then yes, your ecu is suspect number 1.

Is the permanent ground present at this wire with the engine running as well? If so the injector is dumping fuel all the time.

To confirm this is your problem and there is no other problem regarding the excessive fuel you might want to cut the white/blue control wire of #2 injector and connect temporarily the end of it that is connected to the #2 injector - not the end that comes from the ecm and is shorted! - to the control wire of any other, normally working injector.

Saludos amigo, If you need more help you can pm me, in spanish.

An expert is someone who knows each time more on each time less, until he finally knows absolutely everything about absolutely nothing.
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09 Feb 2019 11:02 #26910 by Tyler

juergen.scholl wrote: To confirm this is your problem and there is no other problem regarding the excessive fuel you might want to cut the white/blue control wire of #2 injector and connect temporarily the end of it that is connected to the #2 injector - not the end that comes from the ecm and is shorted! - to the control wire of any other, normally working injector.


Slick idea. B)

gilbert wrote: LOL yes Nissan is keeping me busy I wasn't able to fix the sentra I failed the costomer:( :( :(


Ah don't worry sir, it happens to all of us! I just happened to have a Nissan 350Z kicking my ass all this week. :lol:
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10 Feb 2019 06:21 #26927 by Monde
Also, you can disconnect the injector and the pcm and put test light to battery positive and touch on the control wire, if the test light light, the control wire is shorted. If it does not light, you now are dealing with a driver that is stuck on, grounding the injector all the time and causing the fuel to be dumped at the tail pipe every time the key is on or the truck running.
Please, keep us updated!

Vouloir, c'est pouvoir.
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11 Feb 2019 16:30 #26975 by gilbert
Replied by gilbert on topic 04 nissan pick up fuel dumping from exhuast
God bless you my brothers and sisters.
Monde I did as you asked disconnected the PCM and test light to batt. pos. test light didn't turn on only when PCM is connected and key on. Here or some pics also of #1 injector with key on.

First two pics is showing PCM disconnected injector #2 also disconnected test light to bat.pos and light does not light.

The third pic is PCM plugged in test light to bat. pos. injector #2 key on test light lights.

The fourth pic is the #1 injector key test light to bat. pos. test light doesn't light.

Now I have to tell the customer and see what he wants to do.
Thank you all for your help.
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11 Feb 2019 17:52 #26978 by Tyler
Gilbert, I dunno how you did it man, but you have the most beat up looking test light I've ever seen. :lol:

I meant it as a compliment - I usually mutilate or destroy most of mine before the plastic has a chance to show wear.

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11 Feb 2019 18:28 #26979 by gilbert
Replied by gilbert on topic 04 nissan pick up fuel dumping from exhuast
God bless you my brothers and sisters.

:lol: :lol: :lol: :lol: :lol: :lol: It's been crazy glued to many times brother.

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11 Feb 2019 21:28 #26988 by Monde

gilbert wrote: God bless you my brothers and sisters.
Monde I did as you asked disconnected the PCM and test light to batt. pos. test light didn't turn on only when PCM is connected and key on. Here or some pics also of #1 injector with key on.

First two pics is showing PCM disconnected injector #2 also disconnected test light to bat.pos and light does not light.

The third pic is PCM plugged in test light to bat. pos. injector #2 key on test light lights.

The fourth pic is the #1 injector key test light to bat. pos. test light doesn't light.

Now I have to tell the customer and see what he wants to do.
Thank you all for your help.

One thing to keep in mind is that the injector, if shorted, can overload the driver with too much current destroying it. I do not think the wires wired backwards can do anything to the transistor driver. If you ended up replacing the pcm, make sure the injector is not internally shorted. Hopefully someone will correct me if I am wrong about what I said about the driver being overloaded from a shorted injector.

Vouloir, c'est pouvoir.

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