IPR duty cycle

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Nov 4, 2011 | 10:22 PM

TN~COAL~ROLLER

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From: Piney Flats

IPR duty cycle

What should the IPR duty cycle % be... im thanking mine may be bad its at 15% ....

Nov 4, 2011 | 10:28 PM

mueckster

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From: Damon (South East Texas)

At what speed? Pressure? We need more details.

Nov 4, 2011 | 10:32 PM

Franko72

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From: Alaska

I can max mine out at 65% in 100hp tune, and almost 45% in stock. Both at wide open throttle.
We will need more info like Roland said.

Nov 4, 2011 | 10:41 PM

TN~COAL~ROLLER

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From: Piney Flats

what should it be while cranking ? My truck wont start and i was checking off things that it could be and didnt know the % it should be at

Nov 4, 2011 | 10:51 PM

mueckster

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From: Damon (South East Texas)

If IPR goes above 14%, ICP pressure should easily go above 500 psi provided that the oil reservoir is full, the IPR valve is not stuck open, the high pressure pump is building pressure and there is not an injection control pressure leak between the high pressure pump and all of the injectors. 500 psi is needed to start. You can, however, see the duty cycle go up without the pressure rising. You need to monitor the ICP pressure and see how both readings compare.

Nov 4, 2011 | 11:03 PM

TN~COAL~ROLLER

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From: Piney Flats

The % doesnt move from 15 while cranking , should it?

Nov 4, 2011 | 11:10 PM

mueckster

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From: Damon (South East Texas)

It will pretty much stay the same while cranking since the rpm is remaining constant. It will spike when the engine starts.
What are your volts while cranking? Have changed the cam sensor? Are you getting sufficient fuel?

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Nov 4, 2011 | 11:20 PM

mueckster

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From: Damon (South East Texas)

What is the code? P0603?

Nov 4, 2011 | 11:24 PM

#10

TN~COAL~ROLLER

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From: Piney Flats

yeah, Internal control module.. what would be causing that code to pop up?

Nov 4, 2011 | 11:25 PM

#11

TN~COAL~ROLLER

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From: Piney Flats

and i also got a EF feedback signal not detected P1670 , whats the EF feedback ??

Nov 4, 2011 | 11:40 PM

#12

mueckster

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From: Damon (South East Texas)

CONTINUOUS DTC P0603 IS SET WHEN THE PCM HAS LOST KAPWR (keep alive power)
Note: This code may have been caused by disconnecting the PCM or the batteries.

Possible causes:
Battery or PCM has been disconnected.
battery cables loose or poor connection.
battery discharged.
open in KAPWR circuit.
blown fuse.
PCM.

IDM Electronic Feedback (EF)
The IDM provides the EF output signal to the PCM to confirm that proper timing/duration of fuel delivery command signal (FDCS) was received. Additionally, the EF signal is used to send diagnostics of the IDM and injectors (electrical) to the PCM.
--------------------------------------------------------------------------------
DIAGNOSTIC TROUBLE CODE (DTC) P1670 and P1668
DTC P1668 and P1670 indicates that a communication error has occurred between the PCM and the IDM.
Possible causes:
Open fuse
IDM relay
Open or shorted IDM enable circuit
Open/short in EF circuit
Open/short in FDCS circuit
IDM powering circuits
PCM

Nov 4, 2011 | 11:46 PM

#13

TN~COAL~ROLLER

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From: Piney Flats

Ok thanks alot ill check some things and see what i come up with ..

Nov 5, 2011 | 10:43 AM

#14

woodnthings

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From: Snohomish, WA

P0603 is also set if you use a programmer. When you load tunes or go back to stock, the programmer restarts the PCM much like you do your computer when loading software. After you switch tunes with a programmer, you should go back and erase codes as P0603 will always be present.