Nissan Navara P1272

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Re: Nissan Navara P1272

Postby RYM6746 » Tue Sep 12, 2017 5:48 pm

Yes STC i wouldn't mind having a look at your before and after wave forms especially to compare to mine. Thanks
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Re: Nissan Navara P1272

Postby Liteace » Tue Sep 12, 2017 6:52 pm

STC wrote:I doubt that a new SCV / IMV / MProp will be that cause of this. It is too violent (the change)!
I stand to be corrected !


A new IMV, good work, well done
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Re: Nissan Navara P1272

Postby Dcunning35 » Tue Sep 12, 2017 8:29 pm

Well done Richard ! And on face value there doesn't appear a great difference in the good and bad captures . This is one of a techs great challenges interpretation of a dtc . So the signal looks plausable especially as the component being tested is subject to varying conditions . Basically the current and duty didnt match the pcms monitoring so it spat out the dummy.
When ive seen scv,s sticking yes you see an obvious high current draw but not here.
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Re: Nissan Navara P1272

Postby RYM6746 » Tue Sep 12, 2017 8:49 pm

Exactly what I thought nothing really stands out to me. Maybe the extra 10% duty cycle at certain pressures is taking it out of its "comfort zone".Cannot be sure, I think you would have to check multiple good and bads to secure an answer. The nail in the coffin for me was the hunting at idle and cut out (seen this multiple times on denso systems and fixed it evey time with an IMV) followed by KOEO permanent fault after it had warmed up backed up by bias voltage reaching it all the way down to the IMV. My only regret is not having the scope on it as it failed. I didn't save the bias voltage capture as it wasn't very interesting it was just a quick square waveform just after the ignition was turned on then no voltage or current. Engine would still run but had very limited power
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Re: Nissan Navara P1272

Postby Technician » Wed Sep 13, 2017 1:35 am

Well done RYM, IMV it was then :D
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Re: Nissan Navara P1272

Postby Dcunning35 » Wed Sep 13, 2017 7:38 am

Yes but a curve ball for sure , nothing really jumps out on the waveform , and as rym says the eureka moment came with the surging at idle and stalling ,not at wot I think you would have been analysing the hell out of high and low fuel systems before condemning an imv .
My only thought was to emulate a signal to imv with scope attatched for current and duty and lightly tap the scv body to look for changes .
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Re: Nissan Navara P1272

Postby RYM6746 » Wed Sep 13, 2017 10:01 am

Yes that would of been a great test.
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Re: Nissan Navara P1272

Postby STC » Wed Sep 13, 2017 11:53 pm

RYM6746 wrote:Yes that would of been a great test.


In view of recent events I consider that my contributions here have take their toll and I choose to withdraw.

I refuse to be beaten down by the incompetents in our trade.

Best wishes to all the friends I made here and the great guys that shone a light on problems when I asked for help


Goodbye!
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Re: Nissan Navara P1272

Postby Dcunning35 » Thu Sep 14, 2017 6:44 pm

Once again you will be missed stc , but you know where I am if you need anything pal.
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Re: Nissan Navara P1272

Postby RYM6746 » Fri Sep 15, 2017 3:22 pm

RYM6746 wrote:
Yes that would of been a great test.


In view of recent events I consider that my contributions here have take their toll and I choose to withdraw.

I refuse to be beaten down by the incompetents in our trade.

Best wishes to all the friends I made here and the great guys that shone a light on problems when I asked for help


Goodbye!


What's this got to do with me saying that is a great test? :?:
Any chance of those waveforms before you go? :D
It's a shame to see you leave STC :(
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